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-rw-r--r--platforms/avr/drivers/analog.c138
-rw-r--r--platforms/avr/drivers/analog.h53
-rw-r--r--platforms/avr/drivers/glcdfont.c23
-rw-r--r--platforms/avr/drivers/hd44780.c536
-rw-r--r--platforms/avr/drivers/hd44780.h348
-rw-r--r--platforms/avr/drivers/i2c_master.c241
-rw-r--r--platforms/avr/drivers/i2c_master.h43
-rw-r--r--platforms/avr/drivers/i2c_slave.c111
-rw-r--r--platforms/avr/drivers/i2c_slave.h41
-rw-r--r--platforms/avr/drivers/serial.c529
-rw-r--r--platforms/avr/drivers/spi_master.c180
-rw-r--r--platforms/avr/drivers/spi_master.h59
-rw-r--r--platforms/avr/drivers/ssd1306.c319
-rw-r--r--platforms/avr/drivers/ssd1306.h87
-rw-r--r--platforms/avr/drivers/uart.c170
-rw-r--r--platforms/avr/drivers/uart.h35
-rw-r--r--platforms/avr/drivers/ws2812.c176
-rw-r--r--platforms/avr/drivers/ws2812_i2c.c27
-rw-r--r--platforms/chibios/drivers/analog.c321
-rw-r--r--platforms/chibios/drivers/analog.h41
-rw-r--r--platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.c96
-rw-r--r--platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.h33
-rw-r--r--platforms/chibios/drivers/i2c_master.c121
-rw-r--r--platforms/chibios/drivers/i2c_master.h113
-rw-r--r--platforms/chibios/drivers/serial.c278
-rw-r--r--platforms/chibios/drivers/serial_usart.c318
-rw-r--r--platforms/chibios/drivers/serial_usart.h116
-rw-r--r--platforms/chibios/drivers/spi_master.c202
-rw-r--r--platforms/chibios/drivers/spi_master.h93
-rw-r--r--platforms/chibios/drivers/uart.c50
-rw-r--r--platforms/chibios/drivers/uart.h77
-rw-r--r--platforms/chibios/drivers/usbpd_stm32g4.c76
-rw-r--r--platforms/chibios/drivers/ws2812.c114
-rw-r--r--platforms/chibios/drivers/ws2812_pwm.c311
-rw-r--r--platforms/chibios/drivers/ws2812_spi.c159
35 files changed, 5635 insertions, 0 deletions
diff --git a/platforms/avr/drivers/analog.c b/platforms/avr/drivers/analog.c
new file mode 100644
index 0000000000..8d299ffdb9
--- /dev/null
+++ b/platforms/avr/drivers/analog.c
@@ -0,0 +1,138 @@
+/* Copyright 2015 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <stdint.h>
+#include "analog.h"
+
+static uint8_t aref = ADC_REF_POWER;
+
+void analogReference(uint8_t mode) { aref = mode & (_BV(REFS1) | _BV(REFS0)); }
+
+// Arduino compatible pin input
+int16_t analogRead(uint8_t pin) {
+#if defined(__AVR_ATmega32U4__)
+ // clang-format off
+ static const uint8_t PROGMEM pin_to_mux[] = {
+ //A0 A1 A2 A3 A4 A5
+ //F7 F6 F5 F4 F1 F0
+ 0x07, 0x06, 0x05, 0x04, 0x01, 0x00,
+ //A6 A7 A8 A9 A10 A11
+ //D4 D7 B4 B5 B6 D6
+ 0x20, 0x22, 0x23, 0x24, 0x25, 0x21
+ };
+ // clang-format on
+ if (pin >= 12) return 0;
+ return adc_read(pgm_read_byte(pin_to_mux + pin));
+#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+ if (pin >= 8) return 0;
+ return adc_read(pin);
+#else
+ return 0;
+#endif
+}
+
+int16_t analogReadPin(pin_t pin) { return adc_read(pinToMux(pin)); }
+
+uint8_t pinToMux(pin_t pin) {
+ switch (pin) {
+ // clang-format off
+#if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+ case F0: return 0; // ADC0
+ case F1: return _BV(MUX0); // ADC1
+ case F2: return _BV(MUX1); // ADC2
+ case F3: return _BV(MUX1) | _BV(MUX0); // ADC3
+ case F4: return _BV(MUX2); // ADC4
+ case F5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ case F6: return _BV(MUX2) | _BV(MUX1); // ADC6
+ case F7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7
+ default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#elif defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+ case F0: return 0; // ADC0
+ case F1: return _BV(MUX0); // ADC1
+ case F4: return _BV(MUX2); // ADC4
+ case F5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ case F6: return _BV(MUX2) | _BV(MUX1); // ADC6
+ case F7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7
+ case D4: return _BV(MUX5); // ADC8
+ case D6: return _BV(MUX5) | _BV(MUX0); // ADC9
+ case D7: return _BV(MUX5) | _BV(MUX1); // ADC10
+ case B4: return _BV(MUX5) | _BV(MUX1) | _BV(MUX0); // ADC11
+ case B5: return _BV(MUX5) | _BV(MUX2); // ADC12
+ case B6: return _BV(MUX5) | _BV(MUX2) | _BV(MUX0); // ADC13
+ default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#elif defined(__AVR_ATmega32A__)
+ case A0: return 0; // ADC0
+ case A1: return _BV(MUX0); // ADC1
+ case A2: return _BV(MUX1); // ADC2
+ case A3: return _BV(MUX1) | _BV(MUX0); // ADC3
+ case A4: return _BV(MUX2); // ADC4
+ case A5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ case A6: return _BV(MUX2) | _BV(MUX1); // ADC6
+ case A7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7
+ default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+ case C0: return 0; // ADC0
+ case C1: return _BV(MUX0); // ADC1
+ case C2: return _BV(MUX1); // ADC2
+ case C3: return _BV(MUX1) | _BV(MUX0); // ADC3
+ case C4: return _BV(MUX2); // ADC4
+ case C5: return _BV(MUX2) | _BV(MUX0); // ADC5
+ // ADC7:6 not present in DIP package and not shared by GPIO pins
+ default: return _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V
+#endif
+ // clang-format on
+ }
+ return 0;
+}
+
+int16_t adc_read(uint8_t mux) {
+ uint16_t low;
+
+ // Enable ADC and configure prescaler
+ ADCSRA = _BV(ADEN) | ADC_PRESCALER;
+
+#if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+ // High speed mode and ADC8-13
+ ADCSRB = _BV(ADHSM) | (mux & _BV(MUX5));
+#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+ // High speed mode only
+ ADCSRB = _BV(ADHSM);
+#endif
+
+ // Configure mux input
+#if defined(MUX4)
+ ADMUX = aref | (mux & (_BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0)));
+#else
+ ADMUX = aref | (mux & (_BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0)));
+#endif
+
+ // Start the conversion
+ ADCSRA |= _BV(ADSC);
+ // Wait for result
+ while (ADCSRA & _BV(ADSC))
+ ;
+ // Must read LSB first
+ low = ADCL;
+ // Must read MSB only once!
+ low |= (ADCH << 8);
+
+ // turn off the ADC
+ ADCSRA &= ~(1 << ADEN);
+
+ return low;
+}
diff --git a/platforms/avr/drivers/analog.h b/platforms/avr/drivers/analog.h
new file mode 100644
index 0000000000..058882450d
--- /dev/null
+++ b/platforms/avr/drivers/analog.h
@@ -0,0 +1,53 @@
+/* Copyright 2015 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "quantum.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void analogReference(uint8_t mode);
+int16_t analogRead(uint8_t pin);
+
+int16_t analogReadPin(pin_t pin);
+uint8_t pinToMux(pin_t pin);
+
+int16_t adc_read(uint8_t mux);
+#ifdef __cplusplus
+}
+#endif
+
+#define ADC_REF_EXTERNAL 0 // AREF, Internal Vref turned off
+#define ADC_REF_POWER _BV(REFS0) // AVCC with external capacitor on AREF pin
+#define ADC_REF_INTERNAL (_BV(REFS1) | _BV(REFS0)) // Internal 2.56V Voltage Reference with external capacitor on AREF pin (1.1V for 328P)
+
+// These prescaler values are for high speed mode, ADHSM = 1
+#if F_CPU == 16000000L || F_CPU == 12000000L
+# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS1)) // /64
+#elif F_CPU == 8000000L
+# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS0)) // /32
+#elif F_CPU == 4000000L
+# define ADC_PRESCALER (_BV(ADPS2)) // /16
+#elif F_CPU == 2000000L
+# define ADC_PRESCALER (_BV(ADPS1) | _BV(ADPS0)) // /8
+#elif F_CPU == 1000000L
+# define ADC_PRESCALER _BV(ADPS1) // /4
+#else
+# define ADC_PRESCALER _BV(ADPS0) // /2
+#endif
diff --git a/platforms/avr/drivers/glcdfont.c b/platforms/avr/drivers/glcdfont.c
new file mode 100644
index 0000000000..5e763b054f
--- /dev/null
+++ b/platforms/avr/drivers/glcdfont.c
@@ -0,0 +1,23 @@
+// This is the 'classic' fixed-space bitmap font for Adafruit_GFX since 1.0.
+// See gfxfont.h for newer custom bitmap font info.
+
+#include "progmem.h"
+
+// Standard ASCII 5x7 font
+
+static const unsigned char font[] PROGMEM = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 0x3E, 0x6B, 0x4F, 0x6B, 0x3E, 0x1C, 0x3E, 0x7C, 0x3E, 0x1C, 0x18, 0x3C, 0x7E, 0x3C, 0x18, 0x1C, 0x57, 0x7D, 0x57, 0x1C, 0x1C, 0x5E, 0x7F, 0x5E, 0x1C, 0x00, 0x18, 0x3C, 0x18, 0x00, 0xFF, 0xE7, 0xC3, 0xE7, 0xFF, 0x00, 0x18, 0x24, 0x18, 0x00, 0xFF, 0xE7, 0xDB, 0xE7, 0xFF, 0x30, 0x48, 0x3A, 0x06, 0x0E, 0x26, 0x29, 0x79, 0x29, 0x26, 0x40, 0x7F, 0x05, 0x05, 0x07, 0x40, 0x7F, 0x05, 0x25, 0x3F, 0x5A, 0x3C, 0xE7, 0x3C, 0x5A, 0x7F, 0x3E, 0x1C, 0x1C, 0x08, 0x08, 0x1C, 0x1C, 0x3E, 0x7F, 0x14, 0x22, 0x7F, 0x22, 0x14, 0x5F, 0x5F, 0x00, 0x5F, 0x5F, 0x06, 0x09, 0x7F, 0x01, 0x7F, 0x00, 0x66, 0x89, 0x95, 0x6A, 0x60, 0x60, 0x60, 0x60, 0x60, 0x94, 0xA2, 0xFF, 0xA2, 0x94, 0x08, 0x04, 0x7E, 0x04, 0x08, 0x10, 0x20, 0x7E, 0x20, 0x10, 0x08, 0x08, 0x2A, 0x1C, 0x08, 0x08, 0x1C, 0x2A, 0x08, 0x08, 0x1E, 0x10, 0x10, 0x10, 0x10, 0x0C, 0x1E, 0x0C, 0x1E, 0x0C,
+ 0x30, 0x38, 0x3E, 0x38, 0x30, 0x06, 0x0E, 0x3E, 0x0E, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5F, 0x00, 0x00, 0x00, 0x07, 0x00, 0x07, 0x00, 0x14, 0x7F, 0x14, 0x7F, 0x14, 0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x23, 0x13, 0x08, 0x64, 0x62, 0x36, 0x49, 0x56, 0x20, 0x50, 0x00, 0x08, 0x07, 0x03, 0x00, 0x00, 0x1C, 0x22, 0x41, 0x00, 0x00, 0x41, 0x22, 0x1C, 0x00, 0x2A, 0x1C, 0x7F, 0x1C, 0x2A, 0x08, 0x08, 0x3E, 0x08, 0x08, 0x00, 0x80, 0x70, 0x30, 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x60, 0x60, 0x00, 0x20, 0x10, 0x08, 0x04, 0x02, 0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00, 0x42, 0x7F, 0x40, 0x00, 0x72, 0x49, 0x49, 0x49, 0x46, 0x21, 0x41, 0x49, 0x4D, 0x33, 0x18, 0x14, 0x12, 0x7F, 0x10, 0x27, 0x45, 0x45, 0x45, 0x39, 0x3C, 0x4A, 0x49, 0x49, 0x31, 0x41, 0x21, 0x11, 0x09, 0x07, 0x36, 0x49, 0x49, 0x49, 0x36, 0x46, 0x49, 0x49, 0x29, 0x1E, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x40, 0x34, 0x00, 0x00,
+ 0x00, 0x08, 0x14, 0x22, 0x41, 0x14, 0x14, 0x14, 0x14, 0x14, 0x00, 0x41, 0x22, 0x14, 0x08, 0x02, 0x01, 0x59, 0x09, 0x06, 0x3E, 0x41, 0x5D, 0x59, 0x4E, 0x7C, 0x12, 0x11, 0x12, 0x7C, 0x7F, 0x49, 0x49, 0x49, 0x36, 0x3E, 0x41, 0x41, 0x41, 0x22, 0x7F, 0x41, 0x41, 0x41, 0x3E, 0x7F, 0x49, 0x49, 0x49, 0x41, 0x7F, 0x09, 0x09, 0x09, 0x01, 0x3E, 0x41, 0x41, 0x51, 0x73, 0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00, 0x41, 0x7F, 0x41, 0x00, 0x20, 0x40, 0x41, 0x3F, 0x01, 0x7F, 0x08, 0x14, 0x22, 0x41, 0x7F, 0x40, 0x40, 0x40, 0x40, 0x7F, 0x02, 0x1C, 0x02, 0x7F, 0x7F, 0x04, 0x08, 0x10, 0x7F, 0x3E, 0x41, 0x41, 0x41, 0x3E, 0x7F, 0x09, 0x09, 0x09, 0x06, 0x3E, 0x41, 0x51, 0x21, 0x5E, 0x7F, 0x09, 0x19, 0x29, 0x46, 0x26, 0x49, 0x49, 0x49, 0x32, 0x03, 0x01, 0x7F, 0x01, 0x03, 0x3F, 0x40, 0x40, 0x40, 0x3F, 0x1F, 0x20, 0x40, 0x20, 0x1F, 0x3F, 0x40, 0x38, 0x40, 0x3F, 0x63, 0x14, 0x08, 0x14, 0x63, 0x03, 0x04, 0x78, 0x04, 0x03,
+ 0x61, 0x59, 0x49, 0x4D, 0x43, 0x00, 0x7F, 0x41, 0x41, 0x41, 0x02, 0x04, 0x08, 0x10, 0x20, 0x00, 0x41, 0x41, 0x41, 0x7F, 0x04, 0x02, 0x01, 0x02, 0x04, 0x40, 0x40, 0x40, 0x40, 0x40, 0x00, 0x03, 0x07, 0x08, 0x00, 0x20, 0x54, 0x54, 0x78, 0x40, 0x7F, 0x28, 0x44, 0x44, 0x38, 0x38, 0x44, 0x44, 0x44, 0x28, 0x38, 0x44, 0x44, 0x28, 0x7F, 0x38, 0x54, 0x54, 0x54, 0x18, 0x00, 0x08, 0x7E, 0x09, 0x02, 0x18, 0xA4, 0xA4, 0x9C, 0x78, 0x7F, 0x08, 0x04, 0x04, 0x78, 0x00, 0x44, 0x7D, 0x40, 0x00, 0x20, 0x40, 0x40, 0x3D, 0x00, 0x7F, 0x10, 0x28, 0x44, 0x00, 0x00, 0x41, 0x7F, 0x40, 0x00, 0x7C, 0x04, 0x78, 0x04, 0x78, 0x7C, 0x08, 0x04, 0x04, 0x78, 0x38, 0x44, 0x44, 0x44, 0x38, 0xFC, 0x18, 0x24, 0x24, 0x18, 0x18, 0x24, 0x24, 0x18, 0xFC, 0x7C, 0x08, 0x04, 0x04, 0x08, 0x48, 0x54, 0x54, 0x54, 0x24, 0x04, 0x04, 0x3F, 0x44, 0x24, 0x3C, 0x40, 0x40, 0x20, 0x7C, 0x1C, 0x20, 0x40, 0x20, 0x1C, 0x3C, 0x40, 0x30, 0x40, 0x3C,
+ 0x44, 0x28, 0x10, 0x28, 0x44, 0x4C, 0x90, 0x90, 0x90, 0x7C, 0x44, 0x64, 0x54, 0x4C, 0x44, 0x00, 0x08, 0x36, 0x41, 0x00, 0x00, 0x00, 0x77, 0x00, 0x00, 0x00, 0x41, 0x36, 0x08, 0x00, 0x02, 0x01, 0x02, 0x04, 0x02, 0x3C, 0x26, 0x23, 0x26, 0x3C, 0x1E, 0xA1, 0xA1, 0x61, 0x12, 0x3A, 0x40, 0x40, 0x20, 0x7A, 0x38, 0x54, 0x54, 0x55, 0x59, 0x21, 0x55, 0x55, 0x79, 0x41, 0x22, 0x54, 0x54, 0x78, 0x42, // a-umlaut
+ 0x21, 0x55, 0x54, 0x78, 0x40, 0x20, 0x54, 0x55, 0x79, 0x40, 0x0C, 0x1E, 0x52, 0x72, 0x12, 0x39, 0x55, 0x55, 0x55, 0x59, 0x39, 0x54, 0x54, 0x54, 0x59, 0x39, 0x55, 0x54, 0x54, 0x58, 0x00, 0x00, 0x45, 0x7C, 0x41, 0x00, 0x02, 0x45, 0x7D, 0x42, 0x00, 0x01, 0x45, 0x7C, 0x40, 0x7D, 0x12, 0x11, 0x12, 0x7D, // A-umlaut
+ 0xF0, 0x28, 0x25, 0x28, 0xF0, 0x7C, 0x54, 0x55, 0x45, 0x00, 0x20, 0x54, 0x54, 0x7C, 0x54, 0x7C, 0x0A, 0x09, 0x7F, 0x49, 0x32, 0x49, 0x49, 0x49, 0x32, 0x3A, 0x44, 0x44, 0x44, 0x3A, // o-umlaut
+ 0x32, 0x4A, 0x48, 0x48, 0x30, 0x3A, 0x41, 0x41, 0x21, 0x7A, 0x3A, 0x42, 0x40, 0x20, 0x78, 0x00, 0x9D, 0xA0, 0xA0, 0x7D, 0x3D, 0x42, 0x42, 0x42, 0x3D, // O-umlaut
+ 0x3D, 0x40, 0x40, 0x40, 0x3D, 0x3C, 0x24, 0xFF, 0x24, 0x24, 0x48, 0x7E, 0x49, 0x43, 0x66, 0x2B, 0x2F, 0xFC, 0x2F, 0x2B, 0xFF, 0x09, 0x29, 0xF6, 0x20, 0xC0, 0x88, 0x7E, 0x09, 0x03, 0x20, 0x54, 0x54, 0x79, 0x41, 0x00, 0x00, 0x44, 0x7D, 0x41, 0x30, 0x48, 0x48, 0x4A, 0x32, 0x38, 0x40, 0x40, 0x22, 0x7A, 0x00, 0x7A, 0x0A, 0x0A, 0x72, 0x7D, 0x0D, 0x19, 0x31, 0x7D, 0x26, 0x29, 0x29, 0x2F, 0x28, 0x26, 0x29, 0x29, 0x29, 0x26, 0x30, 0x48, 0x4D, 0x40, 0x20, 0x38, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x38, 0x2F, 0x10, 0xC8, 0xAC, 0xBA, 0x2F, 0x10, 0x28, 0x34, 0xFA, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x08, 0x14, 0x2A, 0x14, 0x22, 0x22, 0x14, 0x2A, 0x14, 0x08, 0x55, 0x00, 0x55, 0x00, 0x55, // #176 (25% block) missing in old code
+ 0xAA, 0x55, 0xAA, 0x55, 0xAA, // 50% block
+ 0xFF, 0x55, 0xFF, 0x55, 0xFF, // 75% block
+ 0x00, 0x00, 0x00, 0xFF, 0x00, 0x10, 0x10, 0x10, 0xFF, 0x00, 0x14, 0x14, 0x14, 0xFF, 0x00, 0x10, 0x10, 0xFF, 0x00, 0xFF, 0x10, 0x10, 0xF0, 0x10, 0xF0, 0x14, 0x14, 0x14, 0xFC, 0x00, 0x14, 0x14, 0xF7, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x14, 0x14, 0xF4, 0x04, 0xFC, 0x14, 0x14, 0x17, 0x10, 0x1F, 0x10, 0x10, 0x1F, 0x10, 0x1F, 0x14, 0x14, 0x14, 0x1F, 0x00, 0x10, 0x10, 0x10, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x10, 0x10, 0x10, 0x10, 0x1F, 0x10, 0x10, 0x10, 0x10, 0xF0, 0x10, 0x00, 0x00, 0x00, 0xFF, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xFF, 0x10, 0x00, 0x00, 0x00, 0xFF, 0x14, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0x1F, 0x10, 0x17, 0x00, 0x00, 0xFC, 0x04, 0xF4, 0x14, 0x14, 0x17, 0x10, 0x17, 0x14, 0x14, 0xF4, 0x04, 0xF4, 0x00, 0x00, 0xFF, 0x00, 0xF7, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0xF7, 0x00, 0xF7, 0x14, 0x14, 0x14, 0x17, 0x14, 0x10, 0x10, 0x1F, 0x10, 0x1F,
+ 0x14, 0x14, 0x14, 0xF4, 0x14, 0x10, 0x10, 0xF0, 0x10, 0xF0, 0x00, 0x00, 0x1F, 0x10, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x14, 0x00, 0x00, 0x00, 0xFC, 0x14, 0x00, 0x00, 0xF0, 0x10, 0xF0, 0x10, 0x10, 0xFF, 0x10, 0xFF, 0x14, 0x14, 0x14, 0xFF, 0x14, 0x10, 0x10, 0x10, 0x1F, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x10, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x38, 0x44, 0x44, 0x38, 0x44, 0xFC, 0x4A, 0x4A, 0x4A, 0x34, // sharp-s or beta
+ 0x7E, 0x02, 0x02, 0x06, 0x06, 0x02, 0x7E, 0x02, 0x7E, 0x02, 0x63, 0x55, 0x49, 0x41, 0x63, 0x38, 0x44, 0x44, 0x3C, 0x04, 0x40, 0x7E, 0x20, 0x1E, 0x20, 0x06, 0x02, 0x7E, 0x02, 0x02, 0x99, 0xA5, 0xE7, 0xA5, 0x99, 0x1C, 0x2A, 0x49, 0x2A, 0x1C, 0x4C, 0x72, 0x01, 0x72, 0x4C, 0x30, 0x4A, 0x4D, 0x4D, 0x30, 0x30, 0x48, 0x78, 0x48, 0x30, 0xBC, 0x62, 0x5A, 0x46, 0x3D, 0x3E, 0x49, 0x49, 0x49, 0x00, 0x7E, 0x01, 0x01, 0x01, 0x7E, 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, 0x44, 0x44, 0x5F, 0x44, 0x44, 0x40, 0x51, 0x4A, 0x44, 0x40, 0x40, 0x44, 0x4A, 0x51, 0x40, 0x00, 0x00, 0xFF, 0x01, 0x03, 0xE0, 0x80, 0xFF, 0x00, 0x00, 0x08, 0x08, 0x6B, 0x6B, 0x08, 0x36, 0x12, 0x36, 0x24, 0x36, 0x06, 0x0F, 0x09, 0x0F, 0x06, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00, 0x30, 0x40, 0xFF, 0x01, 0x01, 0x00, 0x1F, 0x01, 0x01, 0x1E, 0x00, 0x19, 0x1D, 0x17, 0x12, 0x00, 0x3C, 0x3C, 0x3C, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00 // #255 NBSP
+};
diff --git a/platforms/avr/drivers/hd44780.c b/platforms/avr/drivers/hd44780.c
new file mode 100644
index 0000000000..f71069dece
--- /dev/null
+++ b/platforms/avr/drivers/hd44780.c
@@ -0,0 +1,536 @@
+/****************************************************************************
+ Title: HD44780U LCD library
+ Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
+ License: GNU General Public License Version 3
+ File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $
+ Software: AVR-GCC 3.3
+ Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega
+
+ DESCRIPTION
+ Basic routines for interfacing a HD44780U-based text lcd display
+
+ Originally based on Volker Oth's lcd library,
+ changed lcd_init(), added additional constants for lcd_command(),
+ added 4-bit I/O mode, improved and optimized code.
+
+ Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
+ 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
+
+ Memory mapped mode compatible with Kanda STK200, but supports also
+ generation of R/W signal through A8 address line.
+
+ USAGE
+ See the C include lcd.h file for a description of each function
+
+*****************************************************************************/
+#include <inttypes.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include "hd44780.h"
+
+/*
+** constants/macros
+*/
+#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */
+#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
+/* on ATmega64/128 PINF is on port 0x00 and not 0x60 */
+# define PIN(x) (&PORTF == &(x) ? _SFR_IO8(0x00) : (*(&x - 2)))
+#else
+# define PIN(x) (*(&x - 2)) /* address of input register of port x */
+#endif
+
+#if LCD_IO_MODE
+# define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE)
+# define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN);
+# define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN);
+# define lcd_e_toggle() toggle_e()
+# define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN)
+# define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN)
+# define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN)
+# define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN)
+#endif
+
+#if LCD_IO_MODE
+# if LCD_LINES == 1
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE
+# else
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES
+# endif
+#else
+# if LCD_LINES == 1
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE
+# else
+# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES
+# endif
+#endif
+
+#if LCD_CONTROLLER_KS0073
+# if LCD_LINES == 4
+
+# define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */
+# define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */
+# define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */
+
+# endif
+#endif
+
+/*
+** function prototypes
+*/
+#if LCD_IO_MODE
+static void toggle_e(void);
+#endif
+
+/*
+** local functions
+*/
+
+/*************************************************************************
+delay for a minimum of <us> microseconds
+the number of loops is calculated at compile-time from MCU clock frequency
+*************************************************************************/
+#define delay(us) _delay_us(us)
+
+#if LCD_IO_MODE
+/* toggle Enable Pin to initiate write */
+static void toggle_e(void) {
+ lcd_e_high();
+ lcd_e_delay();
+ lcd_e_low();
+}
+#endif
+
+/*************************************************************************
+Low-level function to write byte to LCD controller
+Input: data byte to write to LCD
+ rs 1: write data
+ 0: write instruction
+Returns: none
+*************************************************************************/
+#if LCD_IO_MODE
+static void lcd_write(uint8_t data, uint8_t rs) {
+ unsigned char dataBits;
+
+ if (rs) { /* write data (RS=1, RW=0) */
+ lcd_rs_high();
+ } else { /* write instruction (RS=0, RW=0) */
+ lcd_rs_low();
+ }
+ lcd_rw_low(); /* RW=0 write mode */
+
+ if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
+ /* configure data pins as output */
+ DDR(LCD_DATA0_PORT) |= 0x0F;
+
+ /* output high nibble first */
+ dataBits = LCD_DATA0_PORT & 0xF0;
+ LCD_DATA0_PORT = dataBits | ((data >> 4) & 0x0F);
+ lcd_e_toggle();
+
+ /* output low nibble */
+ LCD_DATA0_PORT = dataBits | (data & 0x0F);
+ lcd_e_toggle();
+
+ /* all data pins high (inactive) */
+ LCD_DATA0_PORT = dataBits | 0x0F;
+ } else {
+ /* configure data pins as output */
+ DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
+ DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
+ DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
+ DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
+
+ /* output high nibble first */
+ LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
+ LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
+ LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
+ LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
+ if (data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
+ if (data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
+ if (data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
+ if (data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
+ lcd_e_toggle();
+
+ /* output low nibble */
+ LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
+ LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
+ LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
+ LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
+ if (data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
+ if (data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
+ if (data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
+ if (data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
+ lcd_e_toggle();
+
+ /* all data pins high (inactive) */
+ LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
+ LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
+ LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
+ LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
+ }
+}
+#else
+# define lcd_write(d, rs) \
+ if (rs) \
+ *(volatile uint8_t *)(LCD_IO_DATA) = d; \
+ else \
+ *(volatile uint8_t *)(LCD_IO_FUNCTION) = d;
+/* rs==0 -> write instruction to LCD_IO_FUNCTION */
+/* rs==1 -> write data to LCD_IO_DATA */
+#endif
+
+/*************************************************************************
+Low-level function to read byte from LCD controller
+Input: rs 1: read data
+ 0: read busy flag / address counter
+Returns: byte read from LCD controller
+*************************************************************************/
+#if LCD_IO_MODE
+static uint8_t lcd_read(uint8_t rs) {
+ uint8_t data;
+
+ if (rs)
+ lcd_rs_high(); /* RS=1: read data */
+ else
+ lcd_rs_low(); /* RS=0: read busy flag */
+ lcd_rw_high(); /* RW=1 read mode */
+
+ if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
+ DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */
+
+ lcd_e_high();
+ lcd_e_delay();
+ data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */
+ lcd_e_low();
+
+ lcd_e_delay(); /* Enable 500ns low */
+
+ lcd_e_high();
+ lcd_e_delay();
+ data |= PIN(LCD_DATA0_PORT) & 0x0F; /* read low nibble */
+ lcd_e_low();
+ } else {
+ /* configure data pins as input */
+ DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN);
+ DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN);
+ DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN);
+ DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN);
+
+ /* read high nibble first */
+ lcd_e_high();
+ lcd_e_delay();
+ data = 0;
+ if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x10;
+ if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x20;
+ if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x40;
+ if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x80;
+ lcd_e_low();
+
+ lcd_e_delay(); /* Enable 500ns low */
+
+ /* read low nibble */
+ lcd_e_high();
+ lcd_e_delay();
+ if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x01;
+ if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x02;
+ if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x04;
+ if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x08;
+ lcd_e_low();
+ }
+ return data;
+}
+#else
+# define lcd_read(rs) (rs) ? *(volatile uint8_t *)(LCD_IO_DATA + LCD_IO_READ) : *(volatile uint8_t *)(LCD_IO_FUNCTION + LCD_IO_READ)
+/* rs==0 -> read instruction from LCD_IO_FUNCTION */
+/* rs==1 -> read data from LCD_IO_DATA */
+#endif
+
+/*************************************************************************
+loops while lcd is busy, returns address counter
+*************************************************************************/
+static uint8_t lcd_waitbusy(void)
+
+{
+ register uint8_t c;
+
+ /* wait until busy flag is cleared */
+ while ((c = lcd_read(0)) & (1 << LCD_BUSY)) {
+ }
+
+ /* the address counter is updated 4us after the busy flag is cleared */
+ delay(LCD_DELAY_BUSY_FLAG);
+
+ /* now read the address counter */
+ return (lcd_read(0)); // return address counter
+
+} /* lcd_waitbusy */
+
+/*************************************************************************
+Move cursor to the start of next line or to the first line if the cursor
+is already on the last line.
+*************************************************************************/
+static inline void lcd_newline(uint8_t pos) {
+ register uint8_t addressCounter;
+
+#if LCD_LINES == 1
+ addressCounter = 0;
+#endif
+#if LCD_LINES == 2
+ if (pos < (LCD_START_LINE2))
+ addressCounter = LCD_START_LINE2;
+ else
+ addressCounter = LCD_START_LINE1;
+#endif
+#if LCD_LINES == 4
+# if KS0073_4LINES_MODE
+ if (pos < LCD_START_LINE2)
+ addressCounter = LCD_START_LINE2;
+ else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3))
+ addressCounter = LCD_START_LINE3;
+ else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4))
+ addressCounter = LCD_START_LINE4;
+ else
+ addressCounter = LCD_START_LINE1;
+# else
+ if (pos < LCD_START_LINE3)
+ addressCounter = LCD_START_LINE2;
+ else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4))
+ addressCounter = LCD_START_LINE3;
+ else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2))
+ addressCounter = LCD_START_LINE4;
+ else
+ addressCounter = LCD_START_LINE1;
+# endif
+#endif
+ lcd_command((1 << LCD_DDRAM) + addressCounter);
+
+} /* lcd_newline */
+
+/*
+** PUBLIC FUNCTIONS
+*/
+
+/*************************************************************************
+Send LCD controller instruction command
+Input: instruction to send to LCD controller, see HD44780 data sheet
+Returns: none
+*************************************************************************/
+void lcd_command(uint8_t cmd) {
+ lcd_waitbusy();
+ lcd_write(cmd, 0);
+}
+
+/*************************************************************************
+Send data byte to LCD controller
+Input: data to send to LCD controller, see HD44780 data sheet
+Returns: none
+*************************************************************************/
+void lcd_data(uint8_t data) {
+ lcd_waitbusy();
+ lcd_write(data, 1);
+}
+
+/*************************************************************************
+Set cursor to specified position
+Input: x horizontal position (0: left most position)
+ y vertical position (0: first line)
+Returns: none
+*************************************************************************/
+void lcd_gotoxy(uint8_t x, uint8_t y) {
+#if LCD_LINES == 1
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
+#endif
+#if LCD_LINES == 2
+ if (y == 0)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
+ else
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
+#endif
+#if LCD_LINES == 4
+ if (y == 0)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
+ else if (y == 1)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
+ else if (y == 2)
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE3 + x);
+ else /* y==3 */
+ lcd_command((1 << LCD_DDRAM) + LCD_START_LINE4 + x);
+#endif
+
+} /* lcd_gotoxy */
+
+/*************************************************************************
+*************************************************************************/
+int lcd_getxy(void) { return lcd_waitbusy(); }
+
+/*************************************************************************
+Clear display and set cursor to home position
+*************************************************************************/
+void lcd_clrscr(void) { lcd_command(1 << LCD_CLR); }
+
+/*************************************************************************
+Set cursor to home position
+*************************************************************************/
+void lcd_home(void) { lcd_command(1 << LCD_HOME); }
+
+/*************************************************************************
+Display character at current cursor position
+Input: character to be displayed
+Returns: none
+*************************************************************************/
+void lcd_putc(char c) {
+ uint8_t pos;
+
+ pos = lcd_waitbusy(); // read busy-flag and address counter
+ if (c == '\n') {
+ lcd_newline(pos);
+ } else {
+#if LCD_WRAP_LINES == 1
+# if LCD_LINES == 1
+ if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
+ }
+# elif LCD_LINES == 2
+ if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
+ } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
+ }
+# elif LCD_LINES == 4
+ if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
+ } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE3, 0);
+ } else if (pos == LCD_START_LINE3 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE4, 0);
+ } else if (pos == LCD_START_LINE4 + LCD_DISP_LENGTH) {
+ lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
+ }
+# endif
+ lcd_waitbusy();
+#endif
+ lcd_write(c, 1);
+ }
+
+} /* lcd_putc */
+
+/*************************************************************************
+Display string without auto linefeed
+Input: string to be displayed
+Returns: none
+*************************************************************************/
+void lcd_puts(const char *s)
+/* print string on lcd (no auto linefeed) */
+{
+ register char c;
+
+ while ((c = *s++)) {
+ lcd_putc(c);
+ }
+
+} /* lcd_puts */
+
+/*************************************************************************
+Display string from program memory without auto linefeed
+Input: string from program memory be be displayed
+Returns: none
+*************************************************************************/
+void lcd_puts_p(const char *progmem_s)
+/* print string from program memory on lcd (no auto linefeed) */
+{
+ register char c;
+
+ while ((c = pgm_read_byte(progmem_s++))) {
+ lcd_putc(c);
+ }
+
+} /* lcd_puts_p */
+
+/*************************************************************************
+Initialize display and select type of cursor
+Input: dispAttr LCD_DISP_OFF display off
+ LCD_DISP_ON display on, cursor off
+ LCD_DISP_ON_CURSOR display on, cursor on
+ LCD_DISP_CURSOR_BLINK display on, cursor on flashing
+Returns: none
+*************************************************************************/
+void lcd_init(uint8_t dispAttr) {
+#if LCD_IO_MODE
+ /*
+ * Initialize LCD to 4 bit I/O mode
+ */
+
+ if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (&LCD_RS_PORT == &LCD_DATA0_PORT) && (&LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) && (LCD_RS_PIN == 4) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6)) {
+ /* configure all port bits as output (all LCD lines on same port) */
+ DDR(LCD_DATA0_PORT) |= 0x7F;
+ } else if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) {
+ /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */
+ DDR(LCD_DATA0_PORT) |= 0x0F;
+ DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
+ DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
+ DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
+ } else {
+ /* configure all port bits as output (LCD data and control lines on different ports */
+ DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
+ DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
+ DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
+ DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
+ DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
+ DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
+ DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
+ }
+ delay(LCD_DELAY_BOOTUP); /* wait 16ms or more after power-on */
+
+ /* initial write to lcd is 8bit */
+ LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // LCD_FUNCTION>>4;
+ LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // LCD_FUNCTION_8BIT>>4;
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT); /* delay, busy flag can't be checked here */
+
+ /* repeat last command */
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
+
+ /* repeat last command a third time */
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
+
+ /* now configure for 4bit mode */
+ LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4
+ lcd_e_toggle();
+ delay(LCD_DELAY_INIT_4BIT); /* some displays need this additional delay */
+
+ /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */
+#else
+ /*
+ * Initialize LCD to 8 bit memory mapped mode
+ */
+
+ /* enable external SRAM (memory mapped lcd) and one wait state */
+ MCUCR = _BV(SRE) | _BV(SRW);
+
+ /* reset LCD */
+ delay(LCD_DELAY_BOOTUP); /* wait 16ms after power-on */
+ lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
+ delay(LCD_DELAY_INIT); /* wait 5ms */
+ lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
+ delay(LCD_DELAY_INIT_REP); /* wait 64us */
+ lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */
+ delay(LCD_DELAY_INIT_REP); /* wait 64us */
+#endif
+
+#if KS0073_4LINES_MODE
+ /* Display with KS0073 controller requires special commands for enabling 4 line mode */
+ lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON);
+ lcd_command(KS0073_4LINES_MODE);
+ lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF);
+#else
+ lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */
+#endif
+ lcd_command(LCD_DISP_OFF); /* display off */
+ lcd_clrscr(); /* display clear */
+ lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
+ lcd_command(dispAttr); /* display/cursor control */
+
+} /* lcd_init */
diff --git a/platforms/avr/drivers/hd44780.h b/platforms/avr/drivers/hd44780.h
new file mode 100644
index 0000000000..08e60f8a44
--- /dev/null
+++ b/platforms/avr/drivers/hd44780.h
@@ -0,0 +1,348 @@
+/*************************************************************************
+ Title : C include file for the HD44780U LCD library (lcd.c)
+ Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
+ License: GNU General Public License Version 3
+ File: $Id: lcd.h,v 1.14.2.4 2015/01/20 17:16:07 peter Exp $
+ Software: AVR-GCC 4.x
+ Hardware: any AVR device, memory mapped mode only for AVR with
+ memory mapped interface (AT90S8515/ATmega8515/ATmega128)
+***************************************************************************/
+
+/**
+ @mainpage
+ Collection of libraries for AVR-GCC
+ @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
+ @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
+
+ @file
+ @defgroup pfleury_lcd LCD library <lcd.h>
+ @code #include <lcd.h> @endcode
+
+ @brief Basic routines for interfacing a HD44780U-based character LCD display
+
+ LCD character displays can be found in many devices, like espresso machines, laser printers.
+ The Hitachi HD44780 controller and its compatible controllers like Samsung KS0066U have become an industry standard for these types of displays.
+
+ This library allows easy interfacing with a HD44780 compatible display and can be
+ operated in memory mapped mode (LCD_IO_MODE defined as 0 in the include file lcd.h.) or in
+ 4-bit IO port mode (LCD_IO_MODE defined as 1). 8-bit IO port mode is not supported.
+
+ Memory mapped mode is compatible with old Kanda STK200 starter kit, but also supports
+ generation of R/W signal through A8 address line.
+
+ @see The chapter <a href=" http://homepage.hispeed.ch/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a>
+ on my home page, which shows example circuits how to connect an LCD to an AVR controller.
+
+ @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
+
+ @version 2.0
+
+ @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
+
+*/
+
+#pragma once
+
+#include <inttypes.h>
+#include <avr/pgmspace.h>
+
+#if (__GNUC__ * 100 + __GNUC_MINOR__) < 405
+# error "This library requires AVR-GCC 4.5 or later, update to newer AVR-GCC compiler !"
+#endif
+
+/**@{*/
+
+/*
+ * LCD and target specific definitions below can be defined in a separate include file with name lcd_definitions.h instead modifying this file
+ * by adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ */
+#ifdef _LCD_DEFINITIONS_FILE
+# include "lcd_definitions.h"
+#endif
+
+/**
+ * @name Definition for LCD controller type
+ * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.
+ */
+#ifndef LCD_CONTROLLER_KS0073
+# define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */
+#endif
+
+/**
+ * @name Definitions for Display Size
+ * Change these definitions to adapt setting to your display
+ *
+ * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
+ * adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile.
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ *
+ */
+#ifndef LCD_LINES
+# define LCD_LINES 2 /**< number of visible lines of the display */
+#endif
+#ifndef LCD_DISP_LENGTH
+# define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */
+#endif
+#ifndef LCD_LINE_LENGTH
+# define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */
+#endif
+#ifndef LCD_START_LINE1
+# define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */
+#endif
+#ifndef LCD_START_LINE2
+# define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */
+#endif
+#ifndef LCD_START_LINE3
+# define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */
+#endif
+#ifndef LCD_START_LINE4
+# define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */
+#endif
+#ifndef LCD_WRAP_LINES
+# define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */
+#endif
+
+/**
+ * @name Definitions for 4-bit IO mode
+ *
+ * The four LCD data lines and the three control lines RS, RW, E can be on the
+ * same port or on different ports.
+ * Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on
+ * different ports.
+ *
+ * Normally the four data lines should be mapped to bit 0..3 on one port, but it
+ * is possible to connect these data lines in different order or even on different
+ * ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions.
+ *
+ * Adjust these definitions to your target.\n
+ * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
+ * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ *
+ */
+#define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */
+
+#if LCD_IO_MODE
+
+# ifndef LCD_PORT
+# define LCD_PORT PORTA /**< port for the LCD lines */
+# endif
+# ifndef LCD_DATA0_PORT
+# define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */
+# endif
+# ifndef LCD_DATA1_PORT
+# define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */
+# endif
+# ifndef LCD_DATA2_PORT
+# define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */
+# endif
+# ifndef LCD_DATA3_PORT
+# define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */
+# endif
+# ifndef LCD_DATA0_PIN
+# define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */
+# endif
+# ifndef LCD_DATA1_PIN
+# define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */
+# endif
+# ifndef LCD_DATA2_PIN
+# define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */
+# endif
+# ifndef LCD_DATA3_PIN
+# define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */
+# endif
+# ifndef LCD_RS_PORT
+# define LCD_RS_PORT LCD_PORT /**< port for RS line */
+# endif
+# ifndef LCD_RS_PIN
+# define LCD_RS_PIN 3 /**< pin for RS line */
+# endif
+# ifndef LCD_RW_PORT
+# define LCD_RW_PORT LCD_PORT /**< port for RW line */
+# endif
+# ifndef LCD_RW_PIN
+# define LCD_RW_PIN 2 /**< pin for RW line */
+# endif
+# ifndef LCD_E_PORT
+# define LCD_E_PORT LCD_PORT /**< port for Enable line */
+# endif
+# ifndef LCD_E_PIN
+# define LCD_E_PIN 1 /**< pin for Enable line */
+# endif
+
+#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || defined(__AVR_ATmega8515__) || defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__)
+/*
+ * memory mapped mode is only supported when the device has an external data memory interface
+ */
+# define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */
+# define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */
+# define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */
+
+#else
+# error "external data memory interface not available for this device, use 4-bit IO port mode"
+
+#endif
+
+/**
+ * @name Definitions of delays
+ * Used to calculate delay timers.
+ * Adapt the F_CPU define in the Makefile to the clock frequency in Hz of your target
+ *
+ * These delay times can be adjusted, if some displays require different delays.\n
+ * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by
+ * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile.
+ * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h
+ */
+#ifndef LCD_DELAY_BOOTUP
+# define LCD_DELAY_BOOTUP 16000 /**< delay in micro seconds after power-on */
+#endif
+#ifndef LCD_DELAY_INIT
+# define LCD_DELAY_INIT 5000 /**< delay in micro seconds after initialization command sent */
+#endif
+#ifndef LCD_DELAY_INIT_REP
+# define LCD_DELAY_INIT_REP 64 /**< delay in micro seconds after initialization command repeated */
+#endif
+#ifndef LCD_DELAY_INIT_4BIT
+# define LCD_DELAY_INIT_4BIT 64 /**< delay in micro seconds after setting 4-bit mode */
+#endif
+#ifndef LCD_DELAY_BUSY_FLAG
+# define LCD_DELAY_BUSY_FLAG 4 /**< time in micro seconds the address counter is updated after busy flag is cleared */
+#endif
+#ifndef LCD_DELAY_ENABLE_PULSE
+# define LCD_DELAY_ENABLE_PULSE 1 /**< enable signal pulse width in micro seconds */
+#endif
+
+/**
+ * @name Definitions for LCD command instructions
+ * The constants define the various LCD controller instructions which can be passed to the
+ * function lcd_command(), see HD44780 data sheet for a complete description.
+ */
+
+/* instruction register bit positions, see HD44780U data sheet */
+#define LCD_CLR 0 /* DB0: clear display */
+#define LCD_HOME 1 /* DB1: return to home position */
+#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */
+#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */
+#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */
+#define LCD_ON 3 /* DB3: turn lcd/cursor on */
+#define LCD_ON_DISPLAY 2 /* DB2: turn display on */
+#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */
+#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */
+#define LCD_MOVE 4 /* DB4: move cursor/display */
+#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */
+#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */
+#define LCD_FUNCTION 5 /* DB5: function set */
+#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */
+#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */
+#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */
+#define LCD_CGRAM 6 /* DB6: set CG RAM address */
+#define LCD_DDRAM 7 /* DB7: set DD RAM address */
+#define LCD_BUSY 7 /* DB7: LCD is busy */
+
+/* set entry mode: display shift on/off, dec/inc cursor move direction */
+#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */
+#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */
+#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */
+#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */
+
+/* display on/off, cursor on/off, blinking char at cursor position */
+#define LCD_DISP_OFF 0x08 /* display off */
+#define LCD_DISP_ON 0x0C /* display on, cursor off */
+#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */
+#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */
+#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */
+
+/* move cursor/shift display */
+#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */
+#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */
+#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */
+#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */
+
+/* function set: set interface data length and number of display lines */
+#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */
+#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */
+#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */
+#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */
+
+#define LCD_MODE_DEFAULT ((1 << LCD_ENTRY_MODE) | (1 << LCD_ENTRY_INC))
+
+/**
+ * @name Functions
+ */
+
+/**
+ @brief Initialize display and select type of cursor
+ @param dispAttr \b LCD_DISP_OFF display off\n
+ \b LCD_DISP_ON display on, cursor off\n
+ \b LCD_DISP_ON_CURSOR display on, cursor on\n
+ \b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing
+ @return none
+*/
+extern void lcd_init(uint8_t dispAttr);
+
+/**
+ @brief Clear display and set cursor to home position
+ @return none
+*/
+extern void lcd_clrscr(void);
+
+/**
+ @brief Set cursor to home position
+ @return none
+*/
+extern void lcd_home(void);
+
+/**
+ @brief Set cursor to specified position
+
+ @param x horizontal position\n (0: left most position)
+ @param y vertical position\n (0: first line)
+ @return none
+*/
+extern void lcd_gotoxy(uint8_t x, uint8_t y);
+
+/**
+ @brief Display character at current cursor position
+ @param c character to be displayed
+ @return none
+*/
+extern void lcd_putc(char c);
+
+/**
+ @brief Display string without auto linefeed
+ @param s string to be displayed
+ @return none
+*/
+extern void lcd_puts(const char *s);
+
+/**
+ @brief Display string from program memory without auto linefeed
+ @param progmem_s string from program memory be be displayed
+ @return none
+ @see lcd_puts_P
+*/
+extern void lcd_puts_p(const char *progmem_s);
+
+/**
+ @brief Send LCD controller instruction command
+ @param cmd instruction to send to LCD controller, see HD44780 data sheet
+ @return none
+*/
+extern void lcd_command(uint8_t cmd);
+
+/**
+ @brief Send data byte to LCD controller
+
+ Similar to lcd_putc(), but without interpreting LF
+ @param data byte to send to LCD controller, see HD44780 data sheet
+ @return none
+*/
+extern void lcd_data(uint8_t data);
+
+/**
+ @brief macros for automatically storing string constant in program memory
+*/
+#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
+
+/**@}*/
diff --git a/platforms/avr/drivers/i2c_master.c b/platforms/avr/drivers/i2c_master.c
new file mode 100644
index 0000000000..2773e00778
--- /dev/null
+++ b/platforms/avr/drivers/i2c_master.c
@@ -0,0 +1,241 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-master-lib
+ */
+
+#include <avr/io.h>
+#include <util/twi.h>
+
+#include "i2c_master.h"
+#include "timer.h"
+#include "wait.h"
+
+#ifndef F_SCL
+# define F_SCL 400000UL // SCL frequency
+#endif
+
+#ifndef I2C_START_RETRY_COUNT
+# define I2C_START_RETRY_COUNT 20
+#endif // I2C_START_RETRY_COUNT
+
+#define TWBR_val (((F_CPU / F_SCL) - 16) / 2)
+
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+
+void i2c_init(void) {
+ TWSR = 0; /* no prescaler */
+ TWBR = (uint8_t)TWBR_val;
+
+#ifdef __AVR_ATmega32A__
+ // set pull-up resistors on I2C bus pins
+ PORTC |= 0b11;
+
+ // enable TWI (two-wire interface)
+ TWCR |= (1 << TWEN);
+
+ // enable TWI interrupt and slave address ACK
+ TWCR |= (1 << TWIE);
+ TWCR |= (1 << TWEA);
+#endif
+}
+
+static i2c_status_t i2c_start_impl(uint8_t address, uint16_t timeout) {
+ // reset TWI control register
+ TWCR = 0;
+ // transmit START condition
+ TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // check if the start condition was successfully transmitted
+ if (((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)) {
+ return I2C_STATUS_ERROR;
+ }
+
+ // load slave address into data register
+ TWDR = address;
+ // start transmission of address
+ TWCR = (1 << TWINT) | (1 << TWEN);
+
+ timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // check if the device has acknowledged the READ / WRITE mode
+ uint8_t twst = TW_STATUS & 0xF8;
+ if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) {
+ return I2C_STATUS_ERROR;
+ }
+
+ return I2C_STATUS_SUCCESS;
+}
+
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout) {
+ // Retry i2c_start_impl a bunch times in case the remote side has interrupts disabled.
+ uint16_t timeout_timer = timer_read();
+ uint16_t time_slice = MAX(1, (timeout == (I2C_TIMEOUT_INFINITE)) ? 5 : (timeout / (I2C_START_RETRY_COUNT))); // if it's infinite, wait 1ms between attempts, otherwise split up the entire timeout into the number of retries
+ i2c_status_t status;
+ do {
+ status = i2c_start_impl(address, time_slice);
+ } while ((status < 0) && ((timeout == I2C_TIMEOUT_INFINITE) || (timer_elapsed(timeout_timer) < timeout)));
+ return status;
+}
+
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout) {
+ // load data into data register
+ TWDR = data;
+ // start transmission of data
+ TWCR = (1 << TWINT) | (1 << TWEN);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ if ((TW_STATUS & 0xF8) != TW_MT_DATA_ACK) {
+ return I2C_STATUS_ERROR;
+ }
+
+ return I2C_STATUS_SUCCESS;
+}
+
+int16_t i2c_read_ack(uint16_t timeout) {
+ // start TWI module and acknowledge data after reception
+ TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // return received data from TWDR
+ return TWDR;
+}
+
+int16_t i2c_read_nack(uint16_t timeout) {
+ // start receiving without acknowledging reception
+ TWCR = (1 << TWINT) | (1 << TWEN);
+
+ uint16_t timeout_timer = timer_read();
+ while (!(TWCR & (1 << TWINT))) {
+ if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+ return I2C_STATUS_TIMEOUT;
+ }
+ }
+
+ // return received data from TWDR
+ return TWDR;
+}
+
+i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+
+ for (uint16_t i = 0; i < length && status >= 0; i++) {
+ status = i2c_write(data[i], timeout);
+ }
+
+ i2c_stop();
+
+ return status;
+}
+
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(address | I2C_READ, timeout);
+
+ for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
+ status = i2c_read_ack(timeout);
+ if (status >= 0) {
+ data[i] = status;
+ }
+ }
+
+ if (status >= 0) {
+ status = i2c_read_nack(timeout);
+ if (status >= 0) {
+ data[(length - 1)] = status;
+ }
+ }
+
+ i2c_stop();
+
+ return (status < 0) ? status : I2C_STATUS_SUCCESS;
+}
+
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
+ if (status >= 0) {
+ status = i2c_write(regaddr, timeout);
+
+ for (uint16_t i = 0; i < length && status >= 0; i++) {
+ status = i2c_write(data[i], timeout);
+ }
+ }
+
+ i2c_stop();
+
+ return status;
+}
+
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_status_t status = i2c_start(devaddr, timeout);
+ if (status < 0) {
+ goto error;
+ }
+
+ status = i2c_write(regaddr, timeout);
+ if (status < 0) {
+ goto error;
+ }
+
+ status = i2c_start(devaddr | 0x01, timeout);
+
+ for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
+ status = i2c_read_ack(timeout);
+ if (status >= 0) {
+ data[i] = status;
+ }
+ }
+
+ if (status >= 0) {
+ status = i2c_read_nack(timeout);
+ if (status >= 0) {
+ data[(length - 1)] = status;
+ }
+ }
+
+error:
+ i2c_stop();
+
+ return (status < 0) ? status : I2C_STATUS_SUCCESS;
+}
+
+void i2c_stop(void) {
+ // transmit STOP condition
+ TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
+}
diff --git a/platforms/avr/drivers/i2c_master.h b/platforms/avr/drivers/i2c_master.h
new file mode 100644
index 0000000000..e5af73364b
--- /dev/null
+++ b/platforms/avr/drivers/i2c_master.h
@@ -0,0 +1,43 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-master-lib
+ */
+
+#pragma once
+
+#define I2C_READ 0x01
+#define I2C_WRITE 0x00
+
+typedef int16_t i2c_status_t;
+
+#define I2C_STATUS_SUCCESS (0)
+#define I2C_STATUS_ERROR (-1)
+#define I2C_STATUS_TIMEOUT (-2)
+
+#define I2C_TIMEOUT_IMMEDIATE (0)
+#define I2C_TIMEOUT_INFINITE (0xFFFF)
+
+void i2c_init(void);
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout);
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout);
+int16_t i2c_read_ack(uint16_t timeout);
+int16_t i2c_read_nack(uint16_t timeout);
+i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
+void i2c_stop(void);
diff --git a/platforms/avr/drivers/i2c_slave.c b/platforms/avr/drivers/i2c_slave.c
new file mode 100644
index 0000000000..2907f164c0
--- /dev/null
+++ b/platforms/avr/drivers/i2c_slave.c
@@ -0,0 +1,111 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
+ */
+
+#include <stddef.h>
+#include <avr/io.h>
+#include <util/twi.h>
+#include <avr/interrupt.h>
+#include <stdbool.h>
+
+#include "i2c_slave.h"
+
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# include "transactions.h"
+
+static volatile bool is_callback_executor = false;
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+
+volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
+
+static volatile uint8_t buffer_address;
+static volatile bool slave_has_register_set = false;
+
+void i2c_slave_init(uint8_t address) {
+ // load address into TWI address register
+ TWAR = address;
+ // set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt
+ TWCR = (1 << TWIE) | (1 << TWEA) | (1 << TWINT) | (1 << TWEN);
+}
+
+void i2c_slave_stop(void) {
+ // clear acknowledge and enable bits
+ TWCR &= ~((1 << TWEA) | (1 << TWEN));
+}
+
+ISR(TWI_vect) {
+ uint8_t ack = 1;
+
+ switch (TW_STATUS) {
+ case TW_SR_SLA_ACK:
+ // The device is now a slave receiver
+ slave_has_register_set = false;
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ is_callback_executor = false;
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ break;
+
+ case TW_SR_DATA_ACK:
+ // This device is a slave receiver and has received data
+ // First byte is the location then the bytes will be writen in buffer with auto-increment
+ if (!slave_has_register_set) {
+ buffer_address = TWDR;
+
+ if (buffer_address >= I2C_SLAVE_REG_COUNT) { // address out of bounds dont ack
+ ack = 0;
+ buffer_address = 0;
+ }
+ slave_has_register_set = true; // address has been received now fill in buffer
+
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ // Work out if we're attempting to execute a callback
+ is_callback_executor = buffer_address == split_transaction_table[I2C_EXECUTE_CALLBACK].initiator2target_offset;
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ } else {
+ i2c_slave_reg[buffer_address] = TWDR;
+ buffer_address++;
+
+#if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ // If we're intending to execute a transaction callback, do so, as we've just received the transaction ID
+ if (is_callback_executor) {
+ split_transaction_desc_t *trans = &split_transaction_table[split_shmem->transaction_id];
+ if (trans->slave_callback) {
+ trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
+ }
+ }
+#endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+ }
+ break;
+
+ case TW_ST_SLA_ACK:
+ case TW_ST_DATA_ACK:
+ // This device is a slave transmitter and master has requested data
+ TWDR = i2c_slave_reg[buffer_address];
+ buffer_address++;
+ break;
+
+ case TW_BUS_ERROR:
+ // We got an error, reset i2c
+ TWCR = 0;
+ default:
+ break;
+ }
+
+ // Reset i2c state machine to be ready for next interrupt
+ TWCR |= (1 << TWIE) | (1 << TWINT) | (ack << TWEA) | (1 << TWEN);
+}
diff --git a/platforms/avr/drivers/i2c_slave.h b/platforms/avr/drivers/i2c_slave.h
new file mode 100644
index 0000000000..a8647c9da3
--- /dev/null
+++ b/platforms/avr/drivers/i2c_slave.h
@@ -0,0 +1,41 @@
+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
+
+ Info: Inititate the library by giving the required address.
+ Read or write to the necessary buffer according to the opperation.
+ */
+
+#pragma once
+
+#ifndef I2C_SLAVE_REG_COUNT
+
+# if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# include "transport.h"
+# define I2C_SLAVE_REG_COUNT sizeof(split_shared_memory_t)
+# else // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# define I2C_SLAVE_REG_COUNT 30
+# endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+
+#endif // I2C_SLAVE_REG_COUNT
+
+_Static_assert(I2C_SLAVE_REG_COUNT < 256, "I2C target registers must be single byte");
+
+extern volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
+
+void i2c_slave_init(uint8_t address);
+void i2c_slave_stop(void);
diff --git a/platforms/avr/drivers/serial.c b/platforms/avr/drivers/serial.c
new file mode 100644
index 0000000000..9a7345a53d
--- /dev/null
+++ b/platforms/avr/drivers/serial.c
@@ -0,0 +1,529 @@
+/*
+ * WARNING: be careful changing this code, it is very timing dependent
+ *
+ * 2018-10-28 checked
+ * avr-gcc 4.9.2
+ * avr-gcc 5.4.0
+ * avr-gcc 7.3.0
+ */
+
+#ifndef F_CPU
+# define F_CPU 16000000
+#endif
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include "serial.h"
+
+#ifdef SOFT_SERIAL_PIN
+
+# if !(defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+# error serial.c is not supported for the currently selected MCU
+# endif
+// if using ATmega32U4/2, AT90USBxxx I2C, can not use PD0 and PD1 in soft serial.
+# if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# if defined(USE_AVR_I2C) && (SOFT_SERIAL_PIN == D0 || SOFT_SERIAL_PIN == D1)
+# error Using I2C, so can not use PD0, PD1
+# endif
+# endif
+// PD0..PD3, common config
+# if SOFT_SERIAL_PIN == D0
+# define EIMSK_BIT _BV(INT0)
+# define EICRx_BIT (~(_BV(ISC00) | _BV(ISC01)))
+# define SERIAL_PIN_INTERRUPT INT0_vect
+# define EICRx EICRA
+# elif SOFT_SERIAL_PIN == D1
+# define EIMSK_BIT _BV(INT1)
+# define EICRx_BIT (~(_BV(ISC10) | _BV(ISC11)))
+# define SERIAL_PIN_INTERRUPT INT1_vect
+# define EICRx EICRA
+# elif SOFT_SERIAL_PIN == D2
+# define EIMSK_BIT _BV(INT2)
+# define EICRx_BIT (~(_BV(ISC20) | _BV(ISC21)))
+# define SERIAL_PIN_INTERRUPT INT2_vect
+# define EICRx EICRA
+# elif SOFT_SERIAL_PIN == D3
+# define EIMSK_BIT _BV(INT3)
+# define EICRx_BIT (~(_BV(ISC30) | _BV(ISC31)))
+# define SERIAL_PIN_INTERRUPT INT3_vect
+# define EICRx EICRA
+# endif
+
+// ATmegaxxU2/AT90USB162 specific config
+# if defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_AT90USB162__)
+// PD4(INT5), PD6(INT6), PD7(INT7), PC7(INT4)
+# if SOFT_SERIAL_PIN == D4
+# define EIMSK_BIT _BV(INT5)
+# define EICRx_BIT (~(_BV(ISC50) | _BV(ISC51)))
+# define SERIAL_PIN_INTERRUPT INT5_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == D6
+# define EIMSK_BIT _BV(INT6)
+# define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+# define SERIAL_PIN_INTERRUPT INT6_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == D7
+# define EIMSK_BIT _BV(INT7)
+# define EICRx_BIT (~(_BV(ISC70) | _BV(ISC71)))
+# define SERIAL_PIN_INTERRUPT INT7_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == C7
+# define EIMSK_BIT _BV(INT4)
+# define EICRx_BIT (~(_BV(ISC40) | _BV(ISC41)))
+# define SERIAL_PIN_INTERRUPT INT4_vect
+# define EICRx EICRB
+# endif
+# endif
+
+// ATmegaxxU4 specific config
+# if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+// PE6(INT6)
+# if SOFT_SERIAL_PIN == E6
+# define EIMSK_BIT _BV(INT6)
+# define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+# define SERIAL_PIN_INTERRUPT INT6_vect
+# define EICRx EICRB
+# endif
+# endif
+
+// AT90USBxxx specific config
+# if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+// PE4..PE7(INT4..INT7)
+# if SOFT_SERIAL_PIN == E4
+# define EIMSK_BIT _BV(INT4)
+# define EICRx_BIT (~(_BV(ISC40) | _BV(ISC41)))
+# define SERIAL_PIN_INTERRUPT INT4_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == E5
+# define EIMSK_BIT _BV(INT5)
+# define EICRx_BIT (~(_BV(ISC50) | _BV(ISC51)))
+# define SERIAL_PIN_INTERRUPT INT5_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == E6
+# define EIMSK_BIT _BV(INT6)
+# define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+# define SERIAL_PIN_INTERRUPT INT6_vect
+# define EICRx EICRB
+# elif SOFT_SERIAL_PIN == E7
+# define EIMSK_BIT _BV(INT7)
+# define EICRx_BIT (~(_BV(ISC70) | _BV(ISC71)))
+# define SERIAL_PIN_INTERRUPT INT7_vect
+# define EICRx EICRB
+# endif
+# endif
+
+# ifndef SERIAL_PIN_INTERRUPT
+# error invalid SOFT_SERIAL_PIN value
+# endif
+
+# define setPinInputHigh(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
+# define setPinOutput(pin) (DDRx_ADDRESS(pin) |= _BV((pin)&0xF))
+# define writePinHigh(pin) (PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
+# define writePinLow(pin) (PORTx_ADDRESS(pin) &= ~_BV((pin)&0xF))
+# define readPin(pin) ((bool)(PINx_ADDRESS(pin) & _BV((pin)&0xF)))
+
+# define ALWAYS_INLINE __attribute__((always_inline))
+# define NO_INLINE __attribute__((noinline))
+# define _delay_sub_us(x) __builtin_avr_delay_cycles(x)
+
+// parity check
+# define ODD_PARITY 1
+# define EVEN_PARITY 0
+# define PARITY EVEN_PARITY
+
+# ifdef SERIAL_DELAY
+// custom setup in config.h
+// #define TID_SEND_ADJUST 2
+// #define SERIAL_DELAY 6 // micro sec
+// #define READ_WRITE_START_ADJUST 30 // cycles
+// #define READ_WRITE_WIDTH_ADJUST 8 // cycles
+# else
+// ============ Standard setups ============
+
+# ifndef SELECT_SOFT_SERIAL_SPEED
+# define SELECT_SOFT_SERIAL_SPEED 1
+// 0: about 189kbps (Experimental only)
+// 1: about 137kbps (default)
+// 2: about 75kbps
+// 3: about 39kbps
+// 4: about 26kbps
+// 5: about 20kbps
+# endif
+
+# if __GNUC__ < 6
+# define TID_SEND_ADJUST 14
+# else
+# define TID_SEND_ADJUST 2
+# endif
+
+# if SELECT_SOFT_SERIAL_SPEED == 0
+// Very High speed
+# define SERIAL_DELAY 4 // micro sec
+# if __GNUC__ < 6
+# define READ_WRITE_START_ADJUST 33 // cycles
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_START_ADJUST 34 // cycles
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 1
+// High speed
+# define SERIAL_DELAY 6 // micro sec
+# if __GNUC__ < 6
+# define READ_WRITE_START_ADJUST 30 // cycles
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_START_ADJUST 33 // cycles
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 2
+// Middle speed
+# define SERIAL_DELAY 12 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 3
+// Low speed
+# define SERIAL_DELAY 24 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 4
+// Very Low speed
+# define SERIAL_DELAY 36 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# elif SELECT_SOFT_SERIAL_SPEED == 5
+// Ultra Low speed
+# define SERIAL_DELAY 48 // micro sec
+# define READ_WRITE_START_ADJUST 30 // cycles
+# if __GNUC__ < 6
+# define READ_WRITE_WIDTH_ADJUST 3 // cycles
+# else
+# define READ_WRITE_WIDTH_ADJUST 7 // cycles
+# endif
+# else
+# error invalid SELECT_SOFT_SERIAL_SPEED value
+# endif /* SELECT_SOFT_SERIAL_SPEED */
+# endif /* SERIAL_DELAY */
+
+# define SERIAL_DELAY_HALF1 (SERIAL_DELAY / 2)
+# define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY / 2)
+
+# define SLAVE_INT_WIDTH_US 1
+# define SLAVE_INT_ACK_WIDTH_UNIT 2
+# define SLAVE_INT_ACK_WIDTH 4
+
+inline static void serial_delay(void) ALWAYS_INLINE;
+inline static void serial_delay(void) { _delay_us(SERIAL_DELAY); }
+
+inline static void serial_delay_half1(void) ALWAYS_INLINE;
+inline static void serial_delay_half1(void) { _delay_us(SERIAL_DELAY_HALF1); }
+
+inline static void serial_delay_half2(void) ALWAYS_INLINE;
+inline static void serial_delay_half2(void) { _delay_us(SERIAL_DELAY_HALF2); }
+
+inline static void serial_output(void) ALWAYS_INLINE;
+inline static void serial_output(void) { setPinOutput(SOFT_SERIAL_PIN); }
+
+// make the serial pin an input with pull-up resistor
+inline static void serial_input_with_pullup(void) ALWAYS_INLINE;
+inline static void serial_input_with_pullup(void) { setPinInputHigh(SOFT_SERIAL_PIN); }
+
+inline static uint8_t serial_read_pin(void) ALWAYS_INLINE;
+inline static uint8_t serial_read_pin(void) { return !!readPin(SOFT_SERIAL_PIN); }
+
+inline static void serial_low(void) ALWAYS_INLINE;
+inline static void serial_low(void) { writePinLow(SOFT_SERIAL_PIN); }
+
+inline static void serial_high(void) ALWAYS_INLINE;
+inline static void serial_high(void) { writePinHigh(SOFT_SERIAL_PIN); }
+
+void soft_serial_initiator_init(void) {
+ serial_output();
+ serial_high();
+}
+
+void soft_serial_target_init(void) {
+ serial_input_with_pullup();
+
+ // Enable INT0-INT7
+ EIMSK |= EIMSK_BIT;
+ EICRx &= EICRx_BIT;
+}
+
+// Used by the sender to synchronize timing with the reciver.
+static void sync_recv(void) NO_INLINE;
+static void sync_recv(void) {
+ for (uint8_t i = 0; i < SERIAL_DELAY * 5 && serial_read_pin(); i++) {
+ }
+ // This shouldn't hang if the target disconnects because the
+ // serial line will float to high if the target does disconnect.
+ while (!serial_read_pin())
+ ;
+}
+
+// Used by the reciver to send a synchronization signal to the sender.
+static void sync_send(void) NO_INLINE;
+static void sync_send(void) {
+ serial_low();
+ serial_delay();
+ serial_high();
+}
+
+// Reads a byte from the serial line
+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) NO_INLINE;
+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
+ uint8_t byte, i, p, pb;
+
+ _delay_sub_us(READ_WRITE_START_ADJUST);
+ for (i = 0, byte = 0, p = PARITY; i < bit; i++) {
+ serial_delay_half1(); // read the middle of pulses
+ if (serial_read_pin()) {
+ byte = (byte << 1) | 1;
+ p ^= 1;
+ } else {
+ byte = (byte << 1) | 0;
+ p ^= 0;
+ }
+ _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
+ serial_delay_half2();
+ }
+ /* recive parity bit */
+ serial_delay_half1(); // read the middle of pulses
+ pb = serial_read_pin();
+ _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
+ serial_delay_half2();
+
+ *pterrcount += (p != pb) ? 1 : 0;
+
+ return byte;
+}
+
+// Sends a byte with MSB ordering
+void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE;
+void serial_write_chunk(uint8_t data, uint8_t bit) {
+ uint8_t b, p;
+ for (p = PARITY, b = 1 << (bit - 1); b; b >>= 1) {
+ if (data & b) {
+ serial_high();
+ p ^= 1;
+ } else {
+ serial_low();
+ p ^= 0;
+ }
+ serial_delay();
+ }
+ /* send parity bit */
+ if (p & 1) {
+ serial_high();
+ } else {
+ serial_low();
+ }
+ serial_delay();
+
+ serial_low(); // sync_send() / senc_recv() need raise edge
+}
+
+static void serial_send_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
+static void serial_send_packet(uint8_t *buffer, uint8_t size) {
+ for (uint8_t i = 0; i < size; ++i) {
+ uint8_t data;
+ data = buffer[i];
+ sync_send();
+ serial_write_chunk(data, 8);
+ }
+}
+
+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) {
+ uint8_t pecount = 0;
+ for (uint8_t i = 0; i < size; ++i) {
+ uint8_t data;
+ sync_recv();
+ data = serial_read_chunk(&pecount, 8);
+ buffer[i] = data;
+ }
+ return pecount == 0;
+}
+
+inline static void change_sender2reciver(void) {
+ sync_send(); // 0
+ serial_delay_half1(); // 1
+ serial_low(); // 2
+ serial_input_with_pullup(); // 2
+ serial_delay_half1(); // 3
+}
+
+inline static void change_reciver2sender(void) {
+ sync_recv(); // 0
+ serial_delay(); // 1
+ serial_low(); // 3
+ serial_output(); // 3
+ serial_delay_half1(); // 4
+}
+
+static inline uint8_t nibble_bits_count(uint8_t bits) {
+ bits = (bits & 0x5) + (bits >> 1 & 0x5);
+ bits = (bits & 0x3) + (bits >> 2 & 0x3);
+ return bits;
+}
+
+// interrupt handle to be used by the target device
+ISR(SERIAL_PIN_INTERRUPT) {
+ // recive transaction table index
+ uint8_t tid, bits;
+ uint8_t pecount = 0;
+ sync_recv();
+ bits = serial_read_chunk(&pecount, 8);
+ tid = bits >> 3;
+ bits = (bits & 7) != (nibble_bits_count(tid) & 7);
+ if (bits || pecount > 0 || tid > NUM_TOTAL_TRANSACTIONS) {
+ return;
+ }
+ serial_delay_half1();
+
+ serial_high(); // response step1 low->high
+ serial_output();
+ _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT * SLAVE_INT_ACK_WIDTH);
+ split_transaction_desc_t *trans = &split_transaction_table[tid];
+ serial_low(); // response step2 ack high->low
+
+ // If the transaction has a callback, we can execute it now
+ if (trans->slave_callback) {
+ trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
+ }
+
+ // target send phase
+ if (trans->target2initiator_buffer_size > 0) serial_send_packet((uint8_t *)split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size);
+ // target switch to input
+ change_sender2reciver();
+
+ // target recive phase
+ if (trans->initiator2target_buffer_size > 0) {
+ if (serial_recive_packet((uint8_t *)split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+ *trans->status = TRANSACTION_ACCEPTED;
+ } else {
+ *trans->status = TRANSACTION_DATA_ERROR;
+ }
+ } else {
+ *trans->status = TRANSACTION_ACCEPTED;
+ }
+
+ sync_recv(); // weit initiator output to high
+}
+
+/////////
+// start transaction by initiator
+//
+// int soft_serial_transaction(int sstd_index)
+//
+// Returns:
+// TRANSACTION_END
+// TRANSACTION_NO_RESPONSE
+// TRANSACTION_DATA_ERROR
+// this code is very time dependent, so we need to disable interrupts
+int soft_serial_transaction(int sstd_index) {
+ if (sstd_index > NUM_TOTAL_TRANSACTIONS) return TRANSACTION_TYPE_ERROR;
+ split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+
+ if (!trans->status) return TRANSACTION_TYPE_ERROR; // not registered
+
+ cli();
+
+ // signal to the target that we want to start a transaction
+ serial_output();
+ serial_low();
+ _delay_us(SLAVE_INT_WIDTH_US);
+
+ // send transaction table index
+ int tid = (sstd_index << 3) | (7 & nibble_bits_count(sstd_index));
+ sync_send();
+ _delay_sub_us(TID_SEND_ADJUST);
+ serial_write_chunk(tid, 8);
+ serial_delay_half1();
+
+ // wait for the target response (step1 low->high)
+ serial_input_with_pullup();
+ while (!serial_read_pin()) {
+ _delay_sub_us(2);
+ }
+
+ // check if the target is present (step2 high->low)
+ for (int i = 0; serial_read_pin(); i++) {
+ if (i > SLAVE_INT_ACK_WIDTH + 1) {
+ // slave failed to pull the line low, assume not present
+ serial_output();
+ serial_high();
+ *trans->status = TRANSACTION_NO_RESPONSE;
+ sei();
+ return TRANSACTION_NO_RESPONSE;
+ }
+ _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT);
+ }
+
+ // initiator recive phase
+ // if the target is present syncronize with it
+ if (trans->target2initiator_buffer_size > 0) {
+ if (!serial_recive_packet((uint8_t *)split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+ serial_output();
+ serial_high();
+ *trans->status = TRANSACTION_DATA_ERROR;
+ sei();
+ return TRANSACTION_DATA_ERROR;
+ }
+ }
+
+ // initiator switch to output
+ change_reciver2sender();
+
+ // initiator send phase
+ if (trans->initiator2target_buffer_size > 0) {
+ serial_send_packet((uint8_t *)split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size);
+ }
+
+ // always, release the line when not in use
+ sync_send();
+
+ *trans->status = TRANSACTION_END;
+ sei();
+ return TRANSACTION_END;
+}
+
+int soft_serial_get_and_clean_status(int sstd_index) {
+ split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+ cli();
+ int retval = *trans->status;
+ *trans->status = 0;
+ ;
+ sei();
+ return retval;
+}
+#endif
+
+// Helix serial.c history
+// 2018-1-29 fork from let's split and add PD2, modify sync_recv() (#2308, bceffdefc)
+// 2018-6-28 bug fix master to slave comm and speed up (#3255, 1038bbef4)
+// (adjusted with avr-gcc 4.9.2)
+// 2018-7-13 remove USE_SERIAL_PD2 macro (#3374, f30d6dd78)
+// (adjusted with avr-gcc 4.9.2)
+// 2018-8-11 add support multi-type transaction (#3608, feb5e4aae)
+// (adjusted with avr-gcc 4.9.2)
+// 2018-10-21 fix serial and RGB animation conflict (#4191, 4665e4fff)
+// (adjusted with avr-gcc 7.3.0)
+// 2018-10-28 re-adjust compiler depend value of delay (#4269, 8517f8a66)
+// (adjusted with avr-gcc 5.4.0, 7.3.0)
+// 2018-12-17 copy to TOP/quantum/split_common/ and remove backward compatibility code (#4669)
diff --git a/platforms/avr/drivers/spi_master.c b/platforms/avr/drivers/spi_master.c
new file mode 100644
index 0000000000..4e8fd3bcdf
--- /dev/null
+++ b/platforms/avr/drivers/spi_master.c
@@ -0,0 +1,180 @@
+/* Copyright 2020
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "spi_master.h"
+
+#include "timer.h"
+
+#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# define SPI_SCK_PIN B1
+# define SPI_MOSI_PIN B2
+# define SPI_MISO_PIN B3
+#elif defined(__AVR_ATmega32A__)
+# define SPI_SCK_PIN B7
+# define SPI_MOSI_PIN B5
+# define SPI_MISO_PIN B6
+#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+# define SPI_SCK_PIN B5
+# define SPI_MOSI_PIN B3
+# define SPI_MISO_PIN B4
+#endif
+
+#ifndef SPI_TIMEOUT
+# define SPI_TIMEOUT 100
+#endif
+
+static pin_t currentSlavePin = NO_PIN;
+static uint8_t currentSlaveConfig = 0;
+static bool currentSlave2X = false;
+
+void spi_init(void) {
+ writePinHigh(SPI_SS_PIN);
+ setPinOutput(SPI_SCK_PIN);
+ setPinOutput(SPI_MOSI_PIN);
+ setPinInput(SPI_MISO_PIN);
+
+ SPCR = (_BV(SPE) | _BV(MSTR));
+}
+
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
+ if (currentSlavePin != NO_PIN || slavePin == NO_PIN) {
+ return false;
+ }
+
+ currentSlaveConfig = 0;
+
+ if (lsbFirst) {
+ currentSlaveConfig |= _BV(DORD);
+ }
+
+ switch (mode) {
+ case 1:
+ currentSlaveConfig |= _BV(CPHA);
+ break;
+ case 2:
+ currentSlaveConfig |= _BV(CPOL);
+ break;
+ case 3:
+ currentSlaveConfig |= (_BV(CPOL) | _BV(CPHA));
+ break;
+ }
+
+ uint16_t roundedDivisor = 1;
+ while (roundedDivisor < divisor) {
+ roundedDivisor <<= 1;
+ }
+
+ switch (roundedDivisor) {
+ case 16:
+ currentSlaveConfig |= _BV(SPR0);
+ break;
+ case 64:
+ currentSlaveConfig |= _BV(SPR1);
+ break;
+ case 128:
+ currentSlaveConfig |= (_BV(SPR1) | _BV(SPR0));
+ break;
+ case 2:
+ currentSlave2X = true;
+ break;
+ case 8:
+ currentSlave2X = true;
+ currentSlaveConfig |= _BV(SPR0);
+ break;
+ case 32:
+ currentSlave2X = true;
+ currentSlaveConfig |= _BV(SPR1);
+ break;
+ }
+
+ SPCR |= currentSlaveConfig;
+ if (currentSlave2X) {
+ SPSR |= _BV(SPI2X);
+ }
+ currentSlavePin = slavePin;
+ setPinOutput(currentSlavePin);
+ writePinLow(currentSlavePin);
+
+ return true;
+}
+
+spi_status_t spi_write(uint8_t data) {
+ SPDR = data;
+
+ uint16_t timeout_timer = timer_read();
+ while (!(SPSR & _BV(SPIF))) {
+ if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) {
+ return SPI_STATUS_TIMEOUT;
+ }
+ }
+
+ return SPDR;
+}
+
+spi_status_t spi_read() {
+ SPDR = 0x00; // Dummy
+
+ uint16_t timeout_timer = timer_read();
+ while (!(SPSR & _BV(SPIF))) {
+ if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) {
+ return SPI_STATUS_TIMEOUT;
+ }
+ }
+
+ return SPDR;
+}
+
+spi_status_t spi_transmit(const uint8_t *data, uint16_t length) {
+ spi_status_t status;
+
+ for (uint16_t i = 0; i < length; i++) {
+ status = spi_write(data[i]);
+
+ if (status < 0) {
+ return status;
+ }
+ }
+
+ return SPI_STATUS_SUCCESS;
+}
+
+spi_status_t spi_receive(uint8_t *data, uint16_t length) {
+ spi_status_t status;
+
+ for (uint16_t i = 0; i < length; i++) {
+ status = spi_read();
+
+ if (status >= 0) {
+ data[i] = status;
+ } else {
+ return status;
+ }
+ }
+
+ return SPI_STATUS_SUCCESS;
+}
+
+void spi_stop(void) {
+ if (currentSlavePin != NO_PIN) {
+ setPinOutput(currentSlavePin);
+ writePinHigh(currentSlavePin);
+ currentSlavePin = NO_PIN;
+ SPSR &= ~(_BV(SPI2X));
+ SPCR &= ~(currentSlaveConfig);
+ currentSlaveConfig = 0;
+ currentSlave2X = false;
+ }
+}
diff --git a/platforms/avr/drivers/spi_master.h b/platforms/avr/drivers/spi_master.h
new file mode 100644
index 0000000000..8a30f47ae4
--- /dev/null
+++ b/platforms/avr/drivers/spi_master.h
@@ -0,0 +1,59 @@
+/* Copyright 2020
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+#include "gpio.h"
+
+typedef int16_t spi_status_t;
+
+// Hardware SS pin is defined in the header so that user code can refer to it
+#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# define SPI_SS_PIN B0
+#elif defined(__AVR_ATmega32A__)
+# define SPI_SS_PIN B4
+#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
+# define SPI_SS_PIN B2
+#endif
+
+#define SPI_STATUS_SUCCESS (0)
+#define SPI_STATUS_ERROR (-1)
+#define SPI_STATUS_TIMEOUT (-2)
+
+#define SPI_TIMEOUT_IMMEDIATE (0)
+#define SPI_TIMEOUT_INFINITE (0xFFFF)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void spi_init(void);
+
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
+
+spi_status_t spi_write(uint8_t data);
+
+spi_status_t spi_read(void);
+
+spi_status_t spi_transmit(const uint8_t *data, uint16_t length);
+
+spi_status_t spi_receive(uint8_t *data, uint16_t length);
+
+void spi_stop(void);
+#ifdef __cplusplus
+}
+#endif
diff --git a/platforms/avr/drivers/ssd1306.c b/platforms/avr/drivers/ssd1306.c
new file mode 100644
index 0000000000..1a09a2bcb7
--- /dev/null
+++ b/platforms/avr/drivers/ssd1306.c
@@ -0,0 +1,319 @@
+#ifdef SSD1306OLED
+
+# include "ssd1306.h"
+# include "i2c.h"
+# include <string.h>
+# include "print.h"
+# include "glcdfont.c"
+# ifdef PROTOCOL_LUFA
+# include "lufa.h"
+# endif
+# include "sendchar.h"
+# include "timer.h"
+
+struct CharacterMatrix display;
+
+// Set this to 1 to help diagnose early startup problems
+// when testing power-on with ble. Turn it off otherwise,
+// as the latency of printing most of the debug info messes
+// with the matrix scan, causing keys to drop.
+# define DEBUG_TO_SCREEN 0
+
+// static uint16_t last_battery_update;
+// static uint32_t vbat;
+//#define BatteryUpdateInterval 10000 /* milliseconds */
+# define ScreenOffInterval 300000 /* milliseconds */
+# if DEBUG_TO_SCREEN
+static uint8_t displaying;
+# endif
+static uint16_t last_flush;
+
+// Write command sequence.
+// Returns true on success.
+static inline bool _send_cmd1(uint8_t cmd) {
+ bool res = false;
+
+ if (i2c_start_write(SSD1306_ADDRESS)) {
+ xprintf("failed to start write to %d\n", SSD1306_ADDRESS);
+ goto done;
+ }
+
+ if (i2c_master_write(0x0 /* command byte follows */)) {
+ print("failed to write control byte\n");
+
+ goto done;
+ }
+
+ if (i2c_master_write(cmd)) {
+ xprintf("failed to write command %d\n", cmd);
+ goto done;
+ }
+ res = true;
+done:
+ i2c_master_stop();
+ return res;
+}
+
+// Write 2-byte command sequence.
+// Returns true on success
+static inline bool _send_cmd2(uint8_t cmd, uint8_t opr) {
+ if (!_send_cmd1(cmd)) {
+ return false;
+ }
+ return _send_cmd1(opr);
+}
+
+// Write 3-byte command sequence.
+// Returns true on success
+static inline bool _send_cmd3(uint8_t cmd, uint8_t opr1, uint8_t opr2) {
+ if (!_send_cmd1(cmd)) {
+ return false;
+ }
+ if (!_send_cmd1(opr1)) {
+ return false;
+ }
+ return _send_cmd1(opr2);
+}
+
+# define send_cmd1(c) \
+ if (!_send_cmd1(c)) { \
+ goto done; \
+ }
+# define send_cmd2(c, o) \
+ if (!_send_cmd2(c, o)) { \
+ goto done; \
+ }
+# define send_cmd3(c, o1, o2) \
+ if (!_send_cmd3(c, o1, o2)) { \
+ goto done; \
+ }
+
+static void clear_display(void) {
+ matrix_clear(&display);
+
+ // Clear all of the display bits (there can be random noise
+ // in the RAM on startup)
+ send_cmd3(PageAddr, 0, (DisplayHeight / 8) - 1);
+ send_cmd3(ColumnAddr, 0, DisplayWidth - 1);
+
+ if (i2c_start_write(SSD1306_ADDRESS)) {
+ goto done;
+ }
+ if (i2c_master_write(0x40)) {
+ // Data mode
+ goto done;
+ }
+ for (uint8_t row = 0; row < MatrixRows; ++row) {
+ for (uint8_t col = 0; col < DisplayWidth; ++col) {
+ i2c_master_write(0);
+ }
+ }
+
+ display.dirty = false;
+
+done:
+ i2c_master_stop();
+}
+
+# if DEBUG_TO_SCREEN
+# undef sendchar
+static int8_t capture_sendchar(uint8_t c) {
+ sendchar(c);
+ iota_gfx_write_char(c);
+
+ if (!displaying) {
+ iota_gfx_flush();
+ }
+ return 0;
+}
+# endif
+
+bool iota_gfx_init(void) {
+ bool success = false;
+
+ send_cmd1(DisplayOff);
+ send_cmd2(SetDisplayClockDiv, 0x80);
+ send_cmd2(SetMultiPlex, DisplayHeight - 1);
+
+ send_cmd2(SetDisplayOffset, 0);
+
+ send_cmd1(SetStartLine | 0x0);
+ send_cmd2(SetChargePump, 0x14 /* Enable */);
+ send_cmd2(SetMemoryMode, 0 /* horizontal addressing */);
+
+# ifdef OLED_ROTATE180
+ // the following Flip the display orientation 180 degrees
+ send_cmd1(SegRemap);
+ send_cmd1(ComScanInc);
+# endif
+# ifndef OLED_ROTATE180
+ // Flips the display orientation 0 degrees
+ send_cmd1(SegRemap | 0x1);
+ send_cmd1(ComScanDec);
+# endif
+
+ send_cmd2(SetComPins, 0x2);
+ send_cmd2(SetContrast, 0x8f);
+ send_cmd2(SetPreCharge, 0xf1);
+ send_cmd2(SetVComDetect, 0x40);
+ send_cmd1(DisplayAllOnResume);
+ send_cmd1(NormalDisplay);
+ send_cmd1(DeActivateScroll);
+ send_cmd1(DisplayOn);
+
+ send_cmd2(SetContrast, 0); // Dim
+
+ clear_display();
+
+ success = true;
+
+ iota_gfx_flush();
+
+# if DEBUG_TO_SCREEN
+ print_set_sendchar(capture_sendchar);
+# endif
+
+done:
+ return success;
+}
+
+bool iota_gfx_off(void) {
+ bool success = false;
+
+ send_cmd1(DisplayOff);
+ success = true;
+
+done:
+ return success;
+}
+
+bool iota_gfx_on(void) {
+ bool success = false;
+
+ send_cmd1(DisplayOn);
+ success = true;
+
+done:
+ return success;
+}
+
+void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c) {
+ *matrix->cursor = c;
+ ++matrix->cursor;
+
+ if (matrix->cursor - &matrix->display[0][0] == sizeof(matrix->display)) {
+ // We went off the end; scroll the display upwards by one line
+ memmove(&matrix->display[0], &matrix->display[1], MatrixCols * (MatrixRows - 1));
+ matrix->cursor = &matrix->display[MatrixRows - 1][0];
+ memset(matrix->cursor, ' ', MatrixCols);
+ }
+}
+
+void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c) {
+ matrix->dirty = true;
+
+ if (c == '\n') {
+ // Clear to end of line from the cursor and then move to the
+ // start of the next line
+ uint8_t cursor_col = (matrix->cursor - &matrix->display[0][0]) % MatrixCols;
+
+ while (cursor_col++ < MatrixCols) {
+ matrix_write_char_inner(matrix, ' ');
+ }
+ return;
+ }
+
+ matrix_write_char_inner(matrix, c);
+}
+
+void iota_gfx_write_char(uint8_t c) { matrix_write_char(&display, c); }
+
+void matrix_write(struct CharacterMatrix *matrix, const char *data) {
+ const char *end = data + strlen(data);
+ while (data < end) {
+ matrix_write_char(matrix, *data);
+ ++data;
+ }
+}
+
+void iota_gfx_write(const char *data) { matrix_write(&display, data); }
+
+void matrix_write_P(struct CharacterMatrix *matrix, const char *data) {
+ while (true) {
+ uint8_t c = pgm_read_byte(data);
+ if (c == 0) {
+ return;
+ }
+ matrix_write_char(matrix, c);
+ ++data;
+ }
+}
+
+void iota_gfx_write_P(const char *data) { matrix_write_P(&display, data); }
+
+void matrix_clear(struct CharacterMatrix *matrix) {
+ memset(matrix->display, ' ', sizeof(matrix->display));
+ matrix->cursor = &matrix->display[0][0];
+ matrix->dirty = true;
+}
+
+void iota_gfx_clear_screen(void) { matrix_clear(&display); }
+
+void matrix_render(struct CharacterMatrix *matrix) {
+ last_flush = timer_read();
+ iota_gfx_on();
+# if DEBUG_TO_SCREEN
+ ++displaying;
+# endif
+
+ // Move to the home position
+ send_cmd3(PageAddr, 0, MatrixRows - 1);
+ send_cmd3(ColumnAddr, 0, (MatrixCols * FontWidth) - 1);
+
+ if (i2c_start_write(SSD1306_ADDRESS)) {
+ goto done;
+ }
+ if (i2c_master_write(0x40)) {
+ // Data mode
+ goto done;
+ }
+
+ for (uint8_t row = 0; row < MatrixRows; ++row) {
+ for (uint8_t col = 0; col < MatrixCols; ++col) {
+ const uint8_t *glyph = font + (matrix->display[row][col] * (FontWidth - 1));
+
+ for (uint8_t glyphCol = 0; glyphCol < FontWidth - 1; ++glyphCol) {
+ uint8_t colBits = pgm_read_byte(glyph + glyphCol);
+ i2c_master_write(colBits);
+ }
+
+ // 1 column of space between chars (it's not included in the glyph)
+ i2c_master_write(0);
+ }
+ }
+
+ matrix->dirty = false;
+
+done:
+ i2c_master_stop();
+# if DEBUG_TO_SCREEN
+ --displaying;
+# endif
+}
+
+void iota_gfx_flush(void) { matrix_render(&display); }
+
+__attribute__((weak)) void iota_gfx_task_user(void) {}
+
+void iota_gfx_task(void) {
+ iota_gfx_task_user();
+
+ if (display.dirty) {
+ iota_gfx_flush();
+ }
+
+ if (timer_elapsed(last_flush) > ScreenOffInterval) {
+ iota_gfx_off();
+ }
+}
+#endif
diff --git a/platforms/avr/drivers/ssd1306.h b/platforms/avr/drivers/ssd1306.h
new file mode 100644
index 0000000000..6eecdcfaa4
--- /dev/null
+++ b/platforms/avr/drivers/ssd1306.h
@@ -0,0 +1,87 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdio.h>
+#include "config.h"
+
+enum ssd1306_cmds {
+ DisplayOff = 0xAE,
+ DisplayOn = 0xAF,
+
+ SetContrast = 0x81,
+ DisplayAllOnResume = 0xA4,
+
+ DisplayAllOn = 0xA5,
+ NormalDisplay = 0xA6,
+ InvertDisplay = 0xA7,
+ SetDisplayOffset = 0xD3,
+ SetComPins = 0xda,
+ SetVComDetect = 0xdb,
+ SetDisplayClockDiv = 0xD5,
+ SetPreCharge = 0xd9,
+ SetMultiPlex = 0xa8,
+ SetLowColumn = 0x00,
+ SetHighColumn = 0x10,
+ SetStartLine = 0x40,
+
+ SetMemoryMode = 0x20,
+ ColumnAddr = 0x21,
+ PageAddr = 0x22,
+
+ ComScanInc = 0xc0,
+ ComScanDec = 0xc8,
+ SegRemap = 0xa0,
+ SetChargePump = 0x8d,
+ ExternalVcc = 0x01,
+ SwitchCapVcc = 0x02,
+
+ ActivateScroll = 0x2f,
+ DeActivateScroll = 0x2e,
+ SetVerticalScrollArea = 0xa3,
+ RightHorizontalScroll = 0x26,
+ LeftHorizontalScroll = 0x27,
+ VerticalAndRightHorizontalScroll = 0x29,
+ VerticalAndLeftHorizontalScroll = 0x2a,
+};
+
+// Controls the SSD1306 128x32 OLED display via i2c
+
+#ifndef SSD1306_ADDRESS
+# define SSD1306_ADDRESS 0x3C
+#endif
+
+#define DisplayHeight 32
+#define DisplayWidth 128
+
+#define FontHeight 8
+#define FontWidth 6
+
+#define MatrixRows (DisplayHeight / FontHeight)
+#define MatrixCols (DisplayWidth / FontWidth)
+
+struct CharacterMatrix {
+ uint8_t display[MatrixRows][MatrixCols];
+ uint8_t *cursor;
+ bool dirty;
+};
+
+extern struct CharacterMatrix display;
+
+bool iota_gfx_init(void);
+void iota_gfx_task(void);
+bool iota_gfx_off(void);
+bool iota_gfx_on(void);
+void iota_gfx_flush(void);
+void iota_gfx_write_char(uint8_t c);
+void iota_gfx_write(const char *data);
+void iota_gfx_write_P(const char *data);
+void iota_gfx_clear_screen(void);
+
+void iota_gfx_task_user(void);
+
+void matrix_clear(struct CharacterMatrix *matrix);
+void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c);
+void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c);
+void matrix_write(struct CharacterMatrix *matrix, const char *data);
+void matrix_write_P(struct CharacterMatrix *matrix, const char *data);
+void matrix_render(struct CharacterMatrix *matrix);
diff --git a/platforms/avr/drivers/uart.c b/platforms/avr/drivers/uart.c
new file mode 100644
index 0000000000..c6abcb6fe0
--- /dev/null
+++ b/platforms/avr/drivers/uart.c
@@ -0,0 +1,170 @@
+/* UART Example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2009 PJRC.COM, LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// Version 1.0: Initial Release
+// Version 1.1: Add support for Teensy 2.0, minor optimizations
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "uart.h"
+
+#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+# define UDRn UDR1
+# define UBRRnL UBRR1L
+# define UCSRnA UCSR1A
+# define UCSRnB UCSR1B
+# define UCSRnC UCSR1C
+# define U2Xn U2X1
+# define RXENn RXEN1
+# define TXENn TXEN1
+# define RXCIEn RXCIE1
+# define UCSZn1 UCSZ11
+# define UCSZn0 UCSZ10
+# define UDRIEn UDRIE1
+# define USARTn_UDRE_vect USART1_UDRE_vect
+# define USARTn_RX_vect USART1_RX_vect
+#elif defined(__AVR_ATmega32A__)
+# define UDRn UDR
+# define UBRRnL UBRRL
+# define UCSRnA UCSRA
+# define UCSRnB UCSRB
+# define UCSRnC UCSRC
+# define U2Xn U2X
+# define RXENn RXEN
+# define TXENn TXEN
+# define RXCIEn RXCIE
+# define UCSZn1 UCSZ1
+# define UCSZn0 UCSZ0
+# define UDRIEn UDRIE
+# define USARTn_UDRE_vect USART_UDRE_vect
+# define USARTn_RX_vect USART_RX_vect
+#elif defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__)
+# define UDRn UDR0
+# define UBRRnL UBRR0L
+# define UCSRnA UCSR0A
+# define UCSRnB UCSR0B
+# define UCSRnC UCSR0C
+# define U2Xn U2X0
+# define RXENn RXEN0
+# define TXENn TXEN0
+# define RXCIEn RXCIE0
+# define UCSZn1 UCSZ01
+# define UCSZn0 UCSZ00
+# define UDRIEn UDRIE0
+# define USARTn_UDRE_vect USART_UDRE_vect
+# define USARTn_RX_vect USART_RX_vect
+#endif
+
+// These buffers may be any size from 2 to 256 bytes.
+#define RX_BUFFER_SIZE 64
+#define TX_BUFFER_SIZE 256
+
+static volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
+static volatile uint8_t tx_buffer_head;
+static volatile uint8_t tx_buffer_tail;
+static volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
+static volatile uint8_t rx_buffer_head;
+static volatile uint8_t rx_buffer_tail;
+
+// Initialize the UART
+void uart_init(uint32_t baud) {
+ cli();
+ UBRRnL = (F_CPU / 4 / baud - 1) / 2;
+ UCSRnA = (1 << U2Xn);
+ UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn);
+ UCSRnC = (1 << UCSZn1) | (1 << UCSZn0);
+ tx_buffer_head = tx_buffer_tail = 0;
+ rx_buffer_head = rx_buffer_tail = 0;
+ sei();
+}
+
+// Transmit a byte
+void uart_putchar(uint8_t c) {
+ uint8_t i;
+
+ i = tx_buffer_head + 1;
+ if (i >= TX_BUFFER_SIZE) i = 0;
+ // return immediately to avoid deadlock when interrupt is disabled(called from ISR)
+ if (tx_buffer_tail == i && (SREG & (1 << SREG_I)) == 0) return;
+ while (tx_buffer_tail == i)
+ ; // wait until space in buffer
+ // cli();
+ tx_buffer[i] = c;
+ tx_buffer_head = i;
+ UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn) | (1 << UDRIEn);
+ // sei();
+}
+
+// Receive a byte
+uint8_t uart_getchar(void) {
+ uint8_t c, i;
+
+ while (rx_buffer_head == rx_buffer_tail)
+ ; // wait for character
+ i = rx_buffer_tail + 1;
+ if (i >= RX_BUFFER_SIZE) i = 0;
+ c = rx_buffer[i];
+ rx_buffer_tail = i;
+ return c;
+}
+
+// Return whether the number of bytes waiting in the receive buffer is nonzero.
+// Call this before uart_getchar() to check if it will need
+// to wait for a byte to arrive.
+bool uart_available(void) {
+ uint8_t head, tail;
+
+ head = rx_buffer_head;
+ tail = rx_buffer_tail;
+ if (head >= tail) return (head - tail) > 0;
+ return (RX_BUFFER_SIZE + head - tail) > 0;
+}
+
+// Transmit Interrupt
+ISR(USARTn_UDRE_vect) {
+ uint8_t i;
+
+ if (tx_buffer_head == tx_buffer_tail) {
+ // buffer is empty, disable transmit interrupt
+ UCSRnB = (1 << RXENn) | (1 << TXENn) | (1 << RXCIEn);
+ } else {
+ i = tx_buffer_tail + 1;
+ if (i >= TX_BUFFER_SIZE) i = 0;
+ UDRn = tx_buffer[i];
+ tx_buffer_tail = i;
+ }
+}
+
+// Receive Interrupt
+ISR(USARTn_RX_vect) {
+ uint8_t c, i;
+
+ c = UDRn;
+ i = rx_buffer_head + 1;
+ if (i >= RX_BUFFER_SIZE) i = 0;
+ if (i != rx_buffer_tail) {
+ rx_buffer[i] = c;
+ rx_buffer_head = i;
+ }
+}
diff --git a/platforms/avr/drivers/uart.h b/platforms/avr/drivers/uart.h
new file mode 100644
index 0000000000..602eb3d8b0
--- /dev/null
+++ b/platforms/avr/drivers/uart.h
@@ -0,0 +1,35 @@
+/* UART Example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2009 PJRC.COM, LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+void uart_init(uint32_t baud);
+
+void uart_putchar(uint8_t c);
+
+uint8_t uart_getchar(void);
+
+bool uart_available(void);
diff --git a/platforms/avr/drivers/ws2812.c b/platforms/avr/drivers/ws2812.c
new file mode 100644
index 0000000000..77c492cd4c
--- /dev/null
+++ b/platforms/avr/drivers/ws2812.c
@@ -0,0 +1,176 @@
+/*
+ * light weight WS2812 lib V2.0b
+ *
+ * Controls WS2811/WS2812/WS2812B RGB-LEDs
+ * Author: Tim (cpldcpu@gmail.com)
+ *
+ * Jan 18th, 2014 v2.0b Initial Version
+ * Nov 29th, 2015 v2.3 Added SK6812RGBW support
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "ws2812.h"
+#include <avr/interrupt.h>
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define pinmask(pin) (_BV((pin)&0xF))
+
+/*
+ * Forward declare internal functions
+ *
+ * The functions take a byte-array and send to the data output as WS2812 bitstream.
+ * The length is the number of bytes to send - three per LED.
+ */
+
+static inline void ws2812_sendarray_mask(uint8_t *data, uint16_t datlen, uint8_t masklo, uint8_t maskhi);
+
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t number_of_leds) {
+ DDRx_ADDRESS(RGB_DI_PIN) |= pinmask(RGB_DI_PIN);
+
+ uint8_t masklo = ~(pinmask(RGB_DI_PIN)) & PORTx_ADDRESS(RGB_DI_PIN);
+ uint8_t maskhi = pinmask(RGB_DI_PIN) | PORTx_ADDRESS(RGB_DI_PIN);
+
+ ws2812_sendarray_mask((uint8_t *)ledarray, number_of_leds * sizeof(LED_TYPE), masklo, maskhi);
+
+ _delay_us(WS2812_TRST_US);
+}
+
+/*
+ This routine writes an array of bytes with RGB values to the Dataout pin
+ using the fast 800kHz clockless WS2811/2812 protocol.
+*/
+
+// Timing in ns
+#define w_zeropulse 350
+#define w_onepulse 900
+#define w_totalperiod 1250
+
+// Fixed cycles used by the inner loop
+#define w_fixedlow 2
+#define w_fixedhigh 4
+#define w_fixedtotal 8
+
+// Insert NOPs to match the timing, if possible
+#define w_zerocycles (((F_CPU / 1000) * w_zeropulse) / 1000000)
+#define w_onecycles (((F_CPU / 1000) * w_onepulse + 500000) / 1000000)
+#define w_totalcycles (((F_CPU / 1000) * w_totalperiod + 500000) / 1000000)
+
+// w1_nops - nops between rising edge and falling edge - low
+#if w_zerocycles >= w_fixedlow
+# define w1_nops (w_zerocycles - w_fixedlow)
+#else
+# define w1_nops 0
+#endif
+
+// w2_nops - nops between fe low and fe high
+#if w_onecycles >= (w_fixedhigh + w1_nops)
+# define w2_nops (w_onecycles - w_fixedhigh - w1_nops)
+#else
+# define w2_nops 0
+#endif
+
+// w3_nops - nops to complete loop
+#if w_totalcycles >= (w_fixedtotal + w1_nops + w2_nops)
+# define w3_nops (w_totalcycles - w_fixedtotal - w1_nops - w2_nops)
+#else
+# define w3_nops 0
+#endif
+
+// The only critical timing parameter is the minimum pulse length of the "0"
+// Warn or throw error if this timing can not be met with current F_CPU settings.
+#define w_lowtime ((w1_nops + w_fixedlow) * 1000000) / (F_CPU / 1000)
+#if w_lowtime > 550
+# error "Light_ws2812: Sorry, the clock speed is too low. Did you set F_CPU correctly?"
+#elif w_lowtime > 450
+# warning "Light_ws2812: The timing is critical and may only work on WS2812B, not on WS2812(S)."
+# warning "Please consider a higher clockspeed, if possible"
+#endif
+
+#define w_nop1 "nop \n\t"
+#define w_nop2 "rjmp .+0 \n\t"
+#define w_nop4 w_nop2 w_nop2
+#define w_nop8 w_nop4 w_nop4
+#define w_nop16 w_nop8 w_nop8
+
+static inline void ws2812_sendarray_mask(uint8_t *data, uint16_t datlen, uint8_t masklo, uint8_t maskhi) {
+ uint8_t curbyte, ctr, sreg_prev;
+
+ sreg_prev = SREG;
+ cli();
+
+ while (datlen--) {
+ curbyte = (*data++);
+
+ asm volatile(" ldi %0,8 \n\t"
+ "loop%=: \n\t"
+ " out %2,%3 \n\t" // '1' [01] '0' [01] - re
+#if (w1_nops & 1)
+ w_nop1
+#endif
+#if (w1_nops & 2)
+ w_nop2
+#endif
+#if (w1_nops & 4)
+ w_nop4
+#endif
+#if (w1_nops & 8)
+ w_nop8
+#endif
+#if (w1_nops & 16)
+ w_nop16
+#endif
+ " sbrs %1,7 \n\t" // '1' [03] '0' [02]
+ " out %2,%4 \n\t" // '1' [--] '0' [03] - fe-low
+ " lsl %1 \n\t" // '1' [04] '0' [04]
+#if (w2_nops & 1)
+ w_nop1
+#endif
+#if (w2_nops & 2)
+ w_nop2
+#endif
+#if (w2_nops & 4)
+ w_nop4
+#endif
+#if (w2_nops & 8)
+ w_nop8
+#endif
+#if (w2_nops & 16)
+ w_nop16
+#endif
+ " out %2,%4 \n\t" // '1' [+1] '0' [+1] - fe-high
+#if (w3_nops & 1)
+ w_nop1
+#endif
+#if (w3_nops & 2)
+ w_nop2
+#endif
+#if (w3_nops & 4)
+ w_nop4
+#endif
+#if (w3_nops & 8)
+ w_nop8
+#endif
+#if (w3_nops & 16)
+ w_nop16
+#endif
+
+ " dec %0 \n\t" // '1' [+2] '0' [+2]
+ " brne loop%=\n\t" // '1' [+3] '0' [+4]
+ : "=&d"(ctr)
+ : "r"(curbyte), "I"(_SFR_IO_ADDR(PORTx_ADDRESS(RGB_DI_PIN))), "r"(maskhi), "r"(masklo));
+ }
+
+ SREG = sreg_prev;
+}
diff --git a/platforms/avr/drivers/ws2812_i2c.c b/platforms/avr/drivers/ws2812_i2c.c
new file mode 100644
index 0000000000..1c332e24b6
--- /dev/null
+++ b/platforms/avr/drivers/ws2812_i2c.c
@@ -0,0 +1,27 @@
+#include "ws2812.h"
+#include "i2c_master.h"
+
+#ifdef RGBW
+# error "RGBW not supported"
+#endif
+
+#ifndef WS2812_ADDRESS
+# define WS2812_ADDRESS 0xb0
+#endif
+
+#ifndef WS2812_TIMEOUT
+# define WS2812_TIMEOUT 100
+#endif
+
+void ws2812_init(void) { i2c_init(); }
+
+// Setleds for standard RGB
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t leds) {
+ static bool s_init = false;
+ if (!s_init) {
+ ws2812_init();
+ s_init = true;
+ }
+
+ i2c_transmit(WS2812_ADDRESS, (uint8_t *)ledarray, sizeof(LED_TYPE) * leds, WS2812_TIMEOUT);
+}
diff --git a/platforms/chibios/drivers/analog.c b/platforms/chibios/drivers/analog.c
new file mode 100644
index 0000000000..8c476fcac2
--- /dev/null
+++ b/platforms/chibios/drivers/analog.c
@@ -0,0 +1,321 @@
+/* Copyright 2019 Drew Mills
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "quantum.h"
+#include "analog.h"
+#include <ch.h>
+#include <hal.h>
+
+#if !HAL_USE_ADC
+# error "You need to set HAL_USE_ADC to TRUE in your halconf.h to use the ADC."
+#endif
+
+#if !STM32_ADC_USE_ADC1 && !STM32_ADC_USE_ADC2 && !STM32_ADC_USE_ADC3 && !STM32_ADC_USE_ADC4
+# error "You need to set one of the 'STM32_ADC_USE_ADCx' settings to TRUE in your mcuconf.h to use the ADC."
+#endif
+
+#if STM32_ADC_DUAL_MODE
+# error "STM32 ADC Dual Mode is not supported at this time."
+#endif
+
+#if STM32_ADCV3_OVERSAMPLING
+# error "STM32 ADCV3 Oversampling is not supported at this time."
+#endif
+
+// Otherwise assume V3
+#if defined(STM32F0XX) || defined(STM32L0XX)
+# define USE_ADCV1
+#elif defined(STM32F1XX) || defined(STM32F2XX) || defined(STM32F4XX)
+# define USE_ADCV2
+#endif
+
+// BODGE to make v2 look like v1,3 and 4
+#ifdef USE_ADCV2
+# if !defined(ADC_SMPR_SMP_1P5) && defined(ADC_SAMPLE_3)
+# define ADC_SMPR_SMP_1P5 ADC_SAMPLE_3
+# define ADC_SMPR_SMP_7P5 ADC_SAMPLE_15
+# define ADC_SMPR_SMP_13P5 ADC_SAMPLE_28
+# define ADC_SMPR_SMP_28P5 ADC_SAMPLE_56
+# define ADC_SMPR_SMP_41P5 ADC_SAMPLE_84
+# define ADC_SMPR_SMP_55P5 ADC_SAMPLE_112
+# define ADC_SMPR_SMP_71P5 ADC_SAMPLE_144
+# define ADC_SMPR_SMP_239P5 ADC_SAMPLE_480
+# endif
+
+# if !defined(ADC_SMPR_SMP_1P5) && defined(ADC_SAMPLE_1P5)
+# define ADC_SMPR_SMP_1P5 ADC_SAMPLE_1P5
+# define ADC_SMPR_SMP_7P5 ADC_SAMPLE_7P5
+# define ADC_SMPR_SMP_13P5 ADC_SAMPLE_13P5
+# define ADC_SMPR_SMP_28P5 ADC_SAMPLE_28P5
+# define ADC_SMPR_SMP_41P5 ADC_SAMPLE_41P5
+# define ADC_SMPR_SMP_55P5 ADC_SAMPLE_55P5
+# define ADC_SMPR_SMP_71P5 ADC_SAMPLE_71P5
+# define ADC_SMPR_SMP_239P5 ADC_SAMPLE_239P5
+# endif
+
+// we still sample at 12bit, but scale down to the requested bit range
+# define ADC_CFGR1_RES_12BIT 12
+# define ADC_CFGR1_RES_10BIT 10
+# define ADC_CFGR1_RES_8BIT 8
+# define ADC_CFGR1_RES_6BIT 6
+#endif
+
+/* User configurable ADC options */
+#ifndef ADC_COUNT
+# if defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX)
+# define ADC_COUNT 1
+# elif defined(STM32F3XX)
+# define ADC_COUNT 4
+# else
+# error "ADC_COUNT has not been set for this ARM microcontroller."
+# endif
+#endif
+
+#ifndef ADC_NUM_CHANNELS
+# define ADC_NUM_CHANNELS 1
+#elif ADC_NUM_CHANNELS != 1
+# error "The ARM ADC implementation currently only supports reading one channel at a time."
+#endif
+
+#ifndef ADC_BUFFER_DEPTH
+# define ADC_BUFFER_DEPTH 1
+#endif
+
+// For more sampling rate options, look at hal_adc_lld.h in ChibiOS
+#ifndef ADC_SAMPLING_RATE
+# define ADC_SAMPLING_RATE ADC_SMPR_SMP_1P5
+#endif
+
+// Options are 12, 10, 8, and 6 bit.
+#ifndef ADC_RESOLUTION
+# ifdef ADC_CFGR_RES_10BITS // ADCv3, ADCv4
+# define ADC_RESOLUTION ADC_CFGR_RES_10BITS
+# else // ADCv1, ADCv5, or the bodge for ADCv2 above
+# define ADC_RESOLUTION ADC_CFGR1_RES_10BIT
+# endif
+#endif
+
+static ADCConfig adcCfg = {};
+static adcsample_t sampleBuffer[ADC_NUM_CHANNELS * ADC_BUFFER_DEPTH];
+
+// Initialize to max number of ADCs, set to empty object to initialize all to false.
+static bool adcInitialized[ADC_COUNT] = {};
+
+// TODO: add back TR handling???
+static ADCConversionGroup adcConversionGroup = {
+ .circular = FALSE,
+ .num_channels = (uint16_t)(ADC_NUM_CHANNELS),
+#if defined(USE_ADCV1)
+ .cfgr1 = ADC_CFGR1_CONT | ADC_RESOLUTION,
+ .smpr = ADC_SAMPLING_RATE,
+#elif defined(USE_ADCV2)
+# if !defined(STM32F1XX)
+ .cr2 = ADC_CR2_SWSTART, // F103 seem very unhappy with, F401 seems very unhappy without...
+# endif
+ .smpr2 = ADC_SMPR2_SMP_AN0(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN1(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN2(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN3(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN4(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN5(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN6(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN7(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN8(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN9(ADC_SAMPLING_RATE),
+ .smpr1 = ADC_SMPR1_SMP_AN10(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN11(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN12(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN13(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN14(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN15(ADC_SAMPLING_RATE),
+#else
+ .cfgr = ADC_CFGR_CONT | ADC_RESOLUTION,
+ .smpr = {ADC_SMPR1_SMP_AN0(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN1(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN2(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN3(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN4(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN5(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN6(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN7(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN8(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN9(ADC_SAMPLING_RATE), ADC_SMPR2_SMP_AN10(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN11(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN12(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN13(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN14(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN15(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN16(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN17(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN18(ADC_SAMPLING_RATE)},
+#endif
+};
+
+// clang-format off
+__attribute__((weak)) adc_mux pinToMux(pin_t pin) {
+ switch (pin) {
+#if defined(STM32F0XX)
+ case A0: return TO_MUX( ADC_CHSELR_CHSEL0, 0 );
+ case A1: return TO_MUX( ADC_CHSELR_CHSEL1, 0 );
+ case A2: return TO_MUX( ADC_CHSELR_CHSEL2, 0 );
+ case A3: return TO_MUX( ADC_CHSELR_CHSEL3, 0 );
+ case A4: return TO_MUX( ADC_CHSELR_CHSEL4, 0 );
+ case A5: return TO_MUX( ADC_CHSELR_CHSEL5, 0 );
+ case A6: return TO_MUX( ADC_CHSELR_CHSEL6, 0 );
+ case A7: return TO_MUX( ADC_CHSELR_CHSEL7, 0 );
+ case B0: return TO_MUX( ADC_CHSELR_CHSEL8, 0 );
+ case B1: return TO_MUX( ADC_CHSELR_CHSEL9, 0 );
+ case C0: return TO_MUX( ADC_CHSELR_CHSEL10, 0 );
+ case C1: return TO_MUX( ADC_CHSELR_CHSEL11, 0 );
+ case C2: return TO_MUX( ADC_CHSELR_CHSEL12, 0 );
+ case C3: return TO_MUX( ADC_CHSELR_CHSEL13, 0 );
+ case C4: return TO_MUX( ADC_CHSELR_CHSEL14, 0 );
+ case C5: return TO_MUX( ADC_CHSELR_CHSEL15, 0 );
+#elif defined(STM32F3XX)
+ case A0: return TO_MUX( ADC_CHANNEL_IN1, 0 );
+ case A1: return TO_MUX( ADC_CHANNEL_IN2, 0 );
+ case A2: return TO_MUX( ADC_CHANNEL_IN3, 0 );
+ case A3: return TO_MUX( ADC_CHANNEL_IN4, 0 );
+ case A4: return TO_MUX( ADC_CHANNEL_IN1, 1 );
+ case A5: return TO_MUX( ADC_CHANNEL_IN2, 1 );
+ case A6: return TO_MUX( ADC_CHANNEL_IN3, 1 );
+ case A7: return TO_MUX( ADC_CHANNEL_IN4, 1 );
+ case B0: return TO_MUX( ADC_CHANNEL_IN12, 2 );
+ case B1: return TO_MUX( ADC_CHANNEL_IN1, 2 );
+ case B2: return TO_MUX( ADC_CHANNEL_IN12, 1 );
+ case B12: return TO_MUX( ADC_CHANNEL_IN3, 3 );
+ case B13: return TO_MUX( ADC_CHANNEL_IN5, 2 );
+ case B14: return TO_MUX( ADC_CHANNEL_IN4, 3 );
+ case B15: return TO_MUX( ADC_CHANNEL_IN5, 3 );
+ case C0: return TO_MUX( ADC_CHANNEL_IN6, 0 ); // Can also be ADC2
+ case C1: return TO_MUX( ADC_CHANNEL_IN7, 0 ); // Can also be ADC2
+ case C2: return TO_MUX( ADC_CHANNEL_IN8, 0 ); // Can also be ADC2
+ case C3: return TO_MUX( ADC_CHANNEL_IN9, 0 ); // Can also be ADC2
+ case C4: return TO_MUX( ADC_CHANNEL_IN5, 1 );
+ case C5: return TO_MUX( ADC_CHANNEL_IN11, 1 );
+ case D8: return TO_MUX( ADC_CHANNEL_IN12, 3 );
+ case D9: return TO_MUX( ADC_CHANNEL_IN13, 3 );
+ case D10: return TO_MUX( ADC_CHANNEL_IN7, 2 ); // Can also be ADC4
+ case D11: return TO_MUX( ADC_CHANNEL_IN8, 2 ); // Can also be ADC4
+ case D12: return TO_MUX( ADC_CHANNEL_IN9, 2 ); // Can also be ADC4
+ case D13: return TO_MUX( ADC_CHANNEL_IN10, 2 ); // Can also be ADC4
+ case D14: return TO_MUX( ADC_CHANNEL_IN11, 2 ); // Can also be ADC4
+ case E7: return TO_MUX( ADC_CHANNEL_IN13, 2 );
+ case E8: return TO_MUX( ADC_CHANNEL_IN6, 2 ); // Can also be ADC4
+ case E9: return TO_MUX( ADC_CHANNEL_IN2, 2 );
+ case E10: return TO_MUX( ADC_CHANNEL_IN14, 2 );
+ case E11: return TO_MUX( ADC_CHANNEL_IN15, 2 );
+ case E12: return TO_MUX( ADC_CHANNEL_IN16, 2 );
+ case E13: return TO_MUX( ADC_CHANNEL_IN3, 2 );
+ case E14: return TO_MUX( ADC_CHANNEL_IN1, 3 );
+ case E15: return TO_MUX( ADC_CHANNEL_IN2, 3 );
+ case F2: return TO_MUX( ADC_CHANNEL_IN10, 0 ); // Can also be ADC2
+ case F4: return TO_MUX( ADC_CHANNEL_IN5, 0 );
+#elif defined(STM32F4XX)
+ case A0: return TO_MUX( ADC_CHANNEL_IN0, 0 );
+ case A1: return TO_MUX( ADC_CHANNEL_IN1, 0 );
+ case A2: return TO_MUX( ADC_CHANNEL_IN2, 0 );
+ case A3: return TO_MUX( ADC_CHANNEL_IN3, 0 );
+ case A4: return TO_MUX( ADC_CHANNEL_IN4, 0 );
+ case A5: return TO_MUX( ADC_CHANNEL_IN5, 0 );
+ case A6: return TO_MUX( ADC_CHANNEL_IN6, 0 );
+ case A7: return TO_MUX( ADC_CHANNEL_IN7, 0 );
+ case B0: return TO_MUX( ADC_CHANNEL_IN8, 0 );
+ case B1: return TO_MUX( ADC_CHANNEL_IN9, 0 );
+ case C0: return TO_MUX( ADC_CHANNEL_IN10, 0 );
+ case C1: return TO_MUX( ADC_CHANNEL_IN11, 0 );
+ case C2: return TO_MUX( ADC_CHANNEL_IN12, 0 );
+ case C3: return TO_MUX( ADC_CHANNEL_IN13, 0 );
+ case C4: return TO_MUX( ADC_CHANNEL_IN14, 0 );
+ case C5: return TO_MUX( ADC_CHANNEL_IN15, 0 );
+# if STM32_ADC_USE_ADC3
+ case F3: return TO_MUX( ADC_CHANNEL_IN9, 2 );
+ case F4: return TO_MUX( ADC_CHANNEL_IN14, 2 );
+ case F5: return TO_MUX( ADC_CHANNEL_IN15, 2 );
+ case F6: return TO_MUX( ADC_CHANNEL_IN4, 2 );
+ case F7: return TO_MUX( ADC_CHANNEL_IN5, 2 );
+ case F8: return TO_MUX( ADC_CHANNEL_IN6, 2 );
+ case F9: return TO_MUX( ADC_CHANNEL_IN7, 2 );
+ case F10: return TO_MUX( ADC_CHANNEL_IN8, 2 );
+# endif
+#elif defined(STM32F1XX)
+ case A0: return TO_MUX( ADC_CHANNEL_IN0, 0 );
+ case A1: return TO_MUX( ADC_CHANNEL_IN1, 0 );
+ case A2: return TO_MUX( ADC_CHANNEL_IN2, 0 );
+ case A3: return TO_MUX( ADC_CHANNEL_IN3, 0 );
+ case A4: return TO_MUX( ADC_CHANNEL_IN4, 0 );
+ case A5: return TO_MUX( ADC_CHANNEL_IN5, 0 );
+ case A6: return TO_MUX( ADC_CHANNEL_IN6, 0 );
+ case A7: return TO_MUX( ADC_CHANNEL_IN7, 0 );
+ case B0: return TO_MUX( ADC_CHANNEL_IN8, 0 );
+ case B1: return TO_MUX( ADC_CHANNEL_IN9, 0 );
+ case C0: return TO_MUX( ADC_CHANNEL_IN10, 0 );
+ case C1: return TO_MUX( ADC_CHANNEL_IN11, 0 );
+ case C2: return TO_MUX( ADC_CHANNEL_IN12, 0 );
+ case C3: return TO_MUX( ADC_CHANNEL_IN13, 0 );
+ case C4: return TO_MUX( ADC_CHANNEL_IN14, 0 );
+ case C5: return TO_MUX( ADC_CHANNEL_IN15, 0 );
+ // STM32F103x[C-G] in 144-pin packages also have analog inputs on F6...F10, but they are on ADC3, and the
+ // ChibiOS ADC driver for STM32F1xx currently supports only ADC1, therefore these pins are not usable.
+#endif
+ }
+
+ // return an adc that would never be used so intToADCDriver will bail out
+ return TO_MUX(0, 0xFF);
+}
+// clang-format on
+
+static inline ADCDriver* intToADCDriver(uint8_t adcInt) {
+ switch (adcInt) {
+#if STM32_ADC_USE_ADC1
+ case 0:
+ return &ADCD1;
+#endif
+#if STM32_ADC_USE_ADC2
+ case 1:
+ return &ADCD2;
+#endif
+#if STM32_ADC_USE_ADC3
+ case 2:
+ return &ADCD3;
+#endif
+#if STM32_ADC_USE_ADC4
+ case 3:
+ return &ADCD4;
+#endif
+ }
+
+ return NULL;
+}
+
+static inline void manageAdcInitializationDriver(uint8_t adc, ADCDriver* adcDriver) {
+ if (!adcInitialized[adc]) {
+ adcStart(adcDriver, &adcCfg);
+ adcInitialized[adc] = true;
+ }
+}
+
+int16_t analogReadPin(pin_t pin) {
+ palSetLineMode(pin, PAL_MODE_INPUT_ANALOG);
+
+ return adc_read(pinToMux(pin));
+}
+
+int16_t analogReadPinAdc(pin_t pin, uint8_t adc) {
+ palSetLineMode(pin, PAL_MODE_INPUT_ANALOG);
+
+ adc_mux target = pinToMux(pin);
+ target.adc = adc;
+ return adc_read(target);
+}
+
+int16_t adc_read(adc_mux mux) {
+#if defined(USE_ADCV1)
+ // TODO: fix previous assumption of only 1 input...
+ adcConversionGroup.chselr = 1 << mux.input; /*no macro to convert N to ADC_CHSELR_CHSEL1*/
+#elif defined(USE_ADCV2)
+ adcConversionGroup.sqr3 = ADC_SQR3_SQ1_N(mux.input);
+#else
+ adcConversionGroup.sqr[0] = ADC_SQR1_SQ1_N(mux.input);
+#endif
+
+ ADCDriver* targetDriver = intToADCDriver(mux.adc);
+ if (!targetDriver) {
+ return 0;
+ }
+
+ manageAdcInitializationDriver(mux.adc, targetDriver);
+ if (adcConvert(targetDriver, &adcConversionGroup, &sampleBuffer[0], ADC_BUFFER_DEPTH) != MSG_OK) {
+ return 0;
+ }
+
+#ifdef USE_ADCV2
+ // fake 12-bit -> N-bit scale
+ return (*sampleBuffer) >> (12 - ADC_RESOLUTION);
+#else
+ // already handled as part of adcConvert
+ return *sampleBuffer;
+#endif
+}
diff --git a/platforms/chibios/drivers/analog.h b/platforms/chibios/drivers/analog.h
new file mode 100644
index 0000000000..e61c394265
--- /dev/null
+++ b/platforms/chibios/drivers/analog.h
@@ -0,0 +1,41 @@
+/* Copyright 2019 Drew Mills
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "quantum.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+ uint16_t input;
+ uint8_t adc;
+} adc_mux;
+#define TO_MUX(i, a) \
+ (adc_mux) { i, a }
+
+int16_t analogReadPin(pin_t pin);
+int16_t analogReadPinAdc(pin_t pin, uint8_t adc);
+adc_mux pinToMux(pin_t pin);
+
+int16_t adc_read(adc_mux mux);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.c b/platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.c
new file mode 100644
index 0000000000..ed26cc7145
--- /dev/null
+++ b/platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.c
@@ -0,0 +1,96 @@
+/* Copyright 2020 Nick Brassel (tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include <hal.h>
+#include "eeprom_driver.h"
+#include "eeprom_stm32_L0_L1.h"
+
+#define EEPROM_BASE_ADDR 0x08080000
+#define EEPROM_ADDR(offset) (EEPROM_BASE_ADDR + (offset))
+#define EEPROM_PTR(offset) ((__IO uint8_t *)EEPROM_ADDR(offset))
+#define EEPROM_BYTE(location, offset) (*(EEPROM_PTR(((uint32_t)location) + ((uint32_t)offset))))
+
+#define BUFFER_BYTE(buffer, offset) (*(((uint8_t *)buffer) + offset))
+
+#define FLASH_PEKEY1 0x89ABCDEF
+#define FLASH_PEKEY2 0x02030405
+
+static inline void STM32_L0_L1_EEPROM_WaitNotBusy(void) {
+ while (FLASH->SR & FLASH_SR_BSY) {
+ __WFI();
+ }
+}
+
+static inline void STM32_L0_L1_EEPROM_Unlock(void) {
+ STM32_L0_L1_EEPROM_WaitNotBusy();
+ if (FLASH->PECR & FLASH_PECR_PELOCK) {
+ FLASH->PEKEYR = FLASH_PEKEY1;
+ FLASH->PEKEYR = FLASH_PEKEY2;
+ }
+}
+
+static inline void STM32_L0_L1_EEPROM_Lock(void) {
+ STM32_L0_L1_EEPROM_WaitNotBusy();
+ FLASH->PECR |= FLASH_PECR_PELOCK;
+}
+
+void eeprom_driver_init(void) {}
+
+void eeprom_driver_erase(void) {
+ STM32_L0_L1_EEPROM_Unlock();
+
+ for (size_t offset = 0; offset < STM32_ONBOARD_EEPROM_SIZE; offset += sizeof(uint32_t)) {
+ FLASH->PECR |= FLASH_PECR_ERASE | FLASH_PECR_DATA;
+
+ *(__IO uint32_t *)EEPROM_ADDR(offset) = (uint32_t)0;
+
+ STM32_L0_L1_EEPROM_WaitNotBusy();
+ FLASH->PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_DATA);
+ }
+
+ STM32_L0_L1_EEPROM_Lock();
+}
+
+void eeprom_read_block(void *buf, const void *addr, size_t len) {
+ for (size_t offset = 0; offset < len; ++offset) {
+ // Drop out if we've hit the limit of the EEPROM
+ if ((((uint32_t)addr) + offset) >= STM32_ONBOARD_EEPROM_SIZE) {
+ break;
+ }
+
+ STM32_L0_L1_EEPROM_WaitNotBusy();
+ BUFFER_BYTE(buf, offset) = EEPROM_BYTE(addr, offset);
+ }
+}
+
+void eeprom_write_block(const void *buf, void *addr, size_t len) {
+ STM32_L0_L1_EEPROM_Unlock();
+
+ for (size_t offset = 0; offset < len; ++offset) {
+ // Drop out if we've hit the limit of the EEPROM
+ if ((((uint32_t)addr) + offset) >= STM32_ONBOARD_EEPROM_SIZE) {
+ break;
+ }
+
+ STM32_L0_L1_EEPROM_WaitNotBusy();
+ EEPROM_BYTE(addr, offset) = BUFFER_BYTE(buf, offset);
+ }
+
+ STM32_L0_L1_EEPROM_Lock();
+}
diff --git a/platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.h b/platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.h
new file mode 100644
index 0000000000..a35defca8b
--- /dev/null
+++ b/platforms/chibios/drivers/eeprom/eeprom_stm32_L0_L1.h
@@ -0,0 +1,33 @@
+/* Copyright 2020 Nick Brassel (tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/*
+ The size used by the STM32 L0/L1 EEPROM driver.
+*/
+#ifndef STM32_ONBOARD_EEPROM_SIZE
+# ifdef VIA_ENABLE
+# define STM32_ONBOARD_EEPROM_SIZE 1024
+# else
+# include "eeconfig.h"
+# define STM32_ONBOARD_EEPROM_SIZE (((EECONFIG_SIZE + 3) / 4) * 4) // based off eeconfig's current usage, aligned to 4-byte sizes, to deal with LTO and EEPROM page sizing
+# endif
+#endif
+
+#if STM32_ONBOARD_EEPROM_SIZE > 128
+# pragma message("Please note: resetting EEPROM using an STM32L0/L1 device takes up to 1 second for every 1kB of internal EEPROM used.")
+#endif
diff --git a/platforms/chibios/drivers/i2c_master.c b/platforms/chibios/drivers/i2c_master.c
new file mode 100644
index 0000000000..fc4bb2ab37
--- /dev/null
+++ b/platforms/chibios/drivers/i2c_master.c
@@ -0,0 +1,121 @@
+/* Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This library is only valid for STM32 processors.
+ * This library follows the convention of the AVR i2c_master library.
+ * As a result addresses are expected to be already shifted (addr << 1).
+ * I2CD1 is the default driver which corresponds to pins B6 and B7. This
+ * can be changed.
+ * Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
+ * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. Pins B6 and B7 are used
+ * but using any other I2C pins should be trivial.
+ */
+#include "quantum.h"
+#include "i2c_master.h"
+#include <string.h>
+#include <hal.h>
+
+static uint8_t i2c_address;
+
+static const I2CConfig i2cconfig = {
+#if defined(USE_I2CV1_CONTRIB)
+ I2C1_CLOCK_SPEED,
+#elif defined(USE_I2CV1)
+ I2C1_OPMODE,
+ I2C1_CLOCK_SPEED,
+ I2C1_DUTY_CYCLE,
+#else
+ // This configures the I2C clock to 400khz assuming a 72Mhz clock
+ // For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
+ STM32_TIMINGR_PRESC(I2C1_TIMINGR_PRESC) | STM32_TIMINGR_SCLDEL(I2C1_TIMINGR_SCLDEL) | STM32_TIMINGR_SDADEL(I2C1_TIMINGR_SDADEL) | STM32_TIMINGR_SCLH(I2C1_TIMINGR_SCLH) | STM32_TIMINGR_SCLL(I2C1_TIMINGR_SCLL), 0, 0
+#endif
+};
+
+static i2c_status_t chibios_to_qmk(const msg_t* status) {
+ switch (*status) {
+ case I2C_NO_ERROR:
+ return I2C_STATUS_SUCCESS;
+ case I2C_TIMEOUT:
+ return I2C_STATUS_TIMEOUT;
+ // I2C_BUS_ERROR, I2C_ARBITRATION_LOST, I2C_ACK_FAILURE, I2C_OVERRUN, I2C_PEC_ERROR, I2C_SMB_ALERT
+ default:
+ return I2C_STATUS_ERROR;
+ }
+}
+
+__attribute__((weak)) void i2c_init(void) {
+ static bool is_initialised = false;
+ if (!is_initialised) {
+ is_initialised = true;
+
+ // Try releasing special pins for a short time
+ palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_INPUT);
+ palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_INPUT);
+
+ chThdSleepMilliseconds(10);
+#if defined(USE_GPIOV1)
+ palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, I2C1_SCL_PAL_MODE);
+ palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, I2C1_SDA_PAL_MODE);
+#else
+ palSetPadMode(I2C1_SCL_BANK, I2C1_SCL, PAL_MODE_ALTERNATE(I2C1_SCL_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
+ palSetPadMode(I2C1_SDA_BANK, I2C1_SDA, PAL_MODE_ALTERNATE(I2C1_SDA_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
+#endif
+ }
+}
+
+i2c_status_t i2c_start(uint8_t address) {
+ i2c_address = address;
+ i2cStart(&I2C_DRIVER, &i2cconfig);
+ return I2C_STATUS_SUCCESS;
+}
+
+i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_address = address;
+ i2cStart(&I2C_DRIVER, &i2cconfig);
+ msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, 0, 0, TIME_MS2I(timeout));
+ return chibios_to_qmk(&status);
+}
+
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_address = address;
+ i2cStart(&I2C_DRIVER, &i2cconfig);
+ msg_t status = i2cMasterReceiveTimeout(&I2C_DRIVER, (i2c_address >> 1), data, length, TIME_MS2I(timeout));
+ return chibios_to_qmk(&status);
+}
+
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_address = devaddr;
+ i2cStart(&I2C_DRIVER, &i2cconfig);
+
+ uint8_t complete_packet[length + 1];
+ for (uint8_t i = 0; i < length; i++) {
+ complete_packet[i + 1] = data[i];
+ }
+ complete_packet[0] = regaddr;
+
+ msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), complete_packet, length + 1, 0, 0, TIME_MS2I(timeout));
+ return chibios_to_qmk(&status);
+}
+
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
+ i2c_address = devaddr;
+ i2cStart(&I2C_DRIVER, &i2cconfig);
+ msg_t status = i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), &regaddr, 1, data, length, TIME_MS2I(timeout));
+ return chibios_to_qmk(&status);
+}
+
+void i2c_stop(void) { i2cStop(&I2C_DRIVER); }
diff --git a/platforms/chibios/drivers/i2c_master.h b/platforms/chibios/drivers/i2c_master.h
new file mode 100644
index 0000000000..c68109acbd
--- /dev/null
+++ b/platforms/chibios/drivers/i2c_master.h
@@ -0,0 +1,113 @@
+/* Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This library follows the convention of the AVR i2c_master library.
+ * As a result addresses are expected to be already shifted (addr << 1).
+ * I2CD1 is the default driver which corresponds to pins B6 and B7. This
+ * can be changed.
+ * Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
+ * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file.
+ */
+#pragma once
+
+#include <ch.h>
+#include <hal.h>
+
+#ifdef I2C1_BANK
+# define I2C1_SCL_BANK I2C1_BANK
+# define I2C1_SDA_BANK I2C1_BANK
+#endif
+
+#ifndef I2C1_SCL_BANK
+# define I2C1_SCL_BANK GPIOB
+#endif
+
+#ifndef I2C1_SDA_BANK
+# define I2C1_SDA_BANK GPIOB
+#endif
+
+#ifndef I2C1_SCL
+# define I2C1_SCL 6
+#endif
+#ifndef I2C1_SDA
+# define I2C1_SDA 7
+#endif
+
+#ifdef USE_I2CV1
+# ifndef I2C1_OPMODE
+# define I2C1_OPMODE OPMODE_I2C
+# endif
+# ifndef I2C1_CLOCK_SPEED
+# define I2C1_CLOCK_SPEED 100000 /* 400000 */
+# endif
+# ifndef I2C1_DUTY_CYCLE
+# define I2C1_DUTY_CYCLE STD_DUTY_CYCLE /* FAST_DUTY_CYCLE_2 */
+# endif
+#else
+// The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock
+// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
+# ifndef I2C1_TIMINGR_PRESC
+# define I2C1_TIMINGR_PRESC 0U
+# endif
+# ifndef I2C1_TIMINGR_SCLDEL
+# define I2C1_TIMINGR_SCLDEL 7U
+# endif
+# ifndef I2C1_TIMINGR_SDADEL
+# define I2C1_TIMINGR_SDADEL 0U
+# endif
+# ifndef I2C1_TIMINGR_SCLH
+# define I2C1_TIMINGR_SCLH 38U
+# endif
+# ifndef I2C1_TIMINGR_SCLL
+# define I2C1_TIMINGR_SCLL 129U
+# endif
+#endif
+
+#ifndef I2C_DRIVER
+# define I2C_DRIVER I2CD1
+#endif
+
+#ifdef USE_GPIOV1
+# ifndef I2C1_SCL_PAL_MODE
+# define I2C1_SCL_PAL_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
+# endif
+# ifndef I2C1_SDA_PAL_MODE
+# define I2C1_SDA_PAL_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
+# endif
+#else
+// The default PAL alternate modes are used to signal that the pins are used for I2C
+# ifndef I2C1_SCL_PAL_MODE
+# define I2C1_SCL_PAL_MODE 4
+# endif
+# ifndef I2C1_SDA_PAL_MODE
+# define I2C1_SDA_PAL_MODE 4
+# endif
+#endif
+
+typedef int16_t i2c_status_t;
+
+#define I2C_STATUS_SUCCESS (0)
+#define I2C_STATUS_ERROR (-1)
+#define I2C_STATUS_TIMEOUT (-2)
+
+void i2c_init(void);
+i2c_status_t i2c_start(uint8_t address);
+i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
+void i2c_stop(void);
diff --git a/platforms/chibios/drivers/serial.c b/platforms/chibios/drivers/serial.c
new file mode 100644
index 0000000000..f54fbcee4e
--- /dev/null
+++ b/platforms/chibios/drivers/serial.c
@@ -0,0 +1,278 @@
+/*
+ * WARNING: be careful changing this code, it is very timing dependent
+ */
+
+#include "quantum.h"
+#include "serial.h"
+#include "wait.h"
+
+#include <hal.h>
+
+// TODO: resolve/remove build warnings
+#if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT) && defined(PROTOCOL_CHIBIOS) && defined(WS2812_DRIVER_BITBANG)
+# warning "RGBLED_SPLIT not supported with bitbang WS2812 driver"
+#endif
+
+// default wait implementation cannot be called within interrupt
+// this method seems to be more accurate than GPT timers
+#if PORT_SUPPORTS_RT == FALSE
+# error "chSysPolledDelayX method not supported on this platform"
+#else
+# undef wait_us
+# define wait_us(x) chSysPolledDelayX(US2RTC(STM32_SYSCLK, x))
+#endif
+
+#ifndef SELECT_SOFT_SERIAL_SPEED
+# define SELECT_SOFT_SERIAL_SPEED 1
+// TODO: correct speeds...
+// 0: about 189kbps (Experimental only)
+// 1: about 137kbps (default)
+// 2: about 75kbps
+// 3: about 39kbps
+// 4: about 26kbps
+// 5: about 20kbps
+#endif
+
+// Serial pulse period in microseconds. At the moment, going lower than 12 causes communication failure
+#if SELECT_SOFT_SERIAL_SPEED == 0
+# define SERIAL_DELAY 12
+#elif SELECT_SOFT_SERIAL_SPEED == 1
+# define SERIAL_DELAY 16
+#elif SELECT_SOFT_SERIAL_SPEED == 2
+# define SERIAL_DELAY 24
+#elif SELECT_SOFT_SERIAL_SPEED == 3
+# define SERIAL_DELAY 32
+#elif SELECT_SOFT_SERIAL_SPEED == 4
+# define SERIAL_DELAY 48
+#elif SELECT_SOFT_SERIAL_SPEED == 5
+# define SERIAL_DELAY 64
+#else
+# error invalid SELECT_SOFT_SERIAL_SPEED value
+#endif
+
+inline static void serial_delay(void) { wait_us(SERIAL_DELAY); }
+inline static void serial_delay_half(void) { wait_us(SERIAL_DELAY / 2); }
+inline static void serial_delay_blip(void) { wait_us(1); }
+inline static void serial_output(void) { setPinOutput(SOFT_SERIAL_PIN); }
+inline static void serial_input(void) { setPinInputHigh(SOFT_SERIAL_PIN); }
+inline static bool serial_read_pin(void) { return !!readPin(SOFT_SERIAL_PIN); }
+inline static void serial_low(void) { writePinLow(SOFT_SERIAL_PIN); }
+inline static void serial_high(void) { writePinHigh(SOFT_SERIAL_PIN); }
+
+void interrupt_handler(void *arg);
+
+// Use thread + palWaitLineTimeout instead of palSetLineCallback
+// - Methods like setPinOutput and palEnableLineEvent/palDisableLineEvent
+// cause the interrupt to lock up, which would limit to only receiving data...
+static THD_WORKING_AREA(waThread1, 128);
+static THD_FUNCTION(Thread1, arg) {
+ (void)arg;
+ chRegSetThreadName("blinker");
+ while (true) {
+ palWaitLineTimeout(SOFT_SERIAL_PIN, TIME_INFINITE);
+ interrupt_handler(NULL);
+ }
+}
+
+void soft_serial_initiator_init(void) {
+ serial_output();
+ serial_high();
+}
+
+void soft_serial_target_init(void) {
+ serial_input();
+
+ palEnablePadEvent(PAL_PORT(SOFT_SERIAL_PIN), PAL_PAD(SOFT_SERIAL_PIN), PAL_EVENT_MODE_FALLING_EDGE);
+ chThdCreateStatic(waThread1, sizeof(waThread1), HIGHPRIO, Thread1, NULL);
+}
+
+// Used by the master to synchronize timing with the slave.
+static void __attribute__((noinline)) sync_recv(void) {
+ serial_input();
+ // This shouldn't hang if the slave disconnects because the
+ // serial line will float to high if the slave does disconnect.
+ while (!serial_read_pin()) {
+ }
+
+ serial_delay();
+}
+
+// Used by the slave to send a synchronization signal to the master.
+static void __attribute__((noinline)) sync_send(void) {
+ serial_output();
+
+ serial_low();
+ serial_delay();
+
+ serial_high();
+}
+
+// Reads a byte from the serial line
+static uint8_t __attribute__((noinline)) serial_read_byte(void) {
+ uint8_t byte = 0;
+ serial_input();
+ for (uint8_t i = 0; i < 8; ++i) {
+ byte = (byte << 1) | serial_read_pin();
+ serial_delay();
+ }
+
+ return byte;
+}
+
+// Sends a byte with MSB ordering
+static void __attribute__((noinline)) serial_write_byte(uint8_t data) {
+ uint8_t b = 8;
+ serial_output();
+ while (b--) {
+ if (data & (1 << b)) {
+ serial_high();
+ } else {
+ serial_low();
+ }
+ serial_delay();
+ }
+}
+
+// interrupt handle to be used by the slave device
+void interrupt_handler(void *arg) {
+ chSysLockFromISR();
+
+ sync_send();
+
+ // read mid pulses
+ serial_delay_blip();
+
+ uint8_t checksum_computed = 0;
+ int sstd_index = 0;
+
+ sstd_index = serial_read_byte();
+ sync_send();
+
+ split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+ for (int i = 0; i < trans->initiator2target_buffer_size; ++i) {
+ split_trans_initiator2target_buffer(trans)[i] = serial_read_byte();
+ sync_send();
+ checksum_computed += split_trans_initiator2target_buffer(trans)[i];
+ }
+ checksum_computed ^= 7;
+ uint8_t checksum_received = serial_read_byte();
+ sync_send();
+
+ // wait for the sync to finish sending
+ serial_delay();
+
+ // Allow any slave processing to occur
+ if (trans->slave_callback) {
+ trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
+ }
+
+ uint8_t checksum = 0;
+ for (int i = 0; i < trans->target2initiator_buffer_size; ++i) {
+ serial_write_byte(split_trans_target2initiator_buffer(trans)[i]);
+ sync_send();
+ serial_delay_half();
+ checksum += split_trans_target2initiator_buffer(trans)[i];
+ }
+ serial_write_byte(checksum ^ 7);
+ sync_send();
+
+ // wait for the sync to finish sending
+ serial_delay();
+
+ *trans->status = (checksum_computed == checksum_received) ? TRANSACTION_ACCEPTED : TRANSACTION_DATA_ERROR;
+
+ // end transaction
+ serial_input();
+
+ // TODO: remove extra delay between transactions
+ serial_delay();
+
+ chSysUnlockFromISR();
+}
+
+/////////
+// start transaction by initiator
+//
+// int soft_serial_transaction(int sstd_index)
+//
+// Returns:
+// TRANSACTION_END
+// TRANSACTION_NO_RESPONSE
+// TRANSACTION_DATA_ERROR
+// this code is very time dependent, so we need to disable interrupts
+int soft_serial_transaction(int sstd_index) {
+ if (sstd_index > NUM_TOTAL_TRANSACTIONS) return TRANSACTION_TYPE_ERROR;
+ split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+ if (!trans->status) return TRANSACTION_TYPE_ERROR; // not registered
+
+ // TODO: remove extra delay between transactions
+ serial_delay();
+
+ // this code is very time dependent, so we need to disable interrupts
+ chSysLock();
+
+ // signal to the slave that we want to start a transaction
+ serial_output();
+ serial_low();
+ serial_delay_blip();
+
+ // wait for the slaves response
+ serial_input();
+ serial_high();
+ serial_delay();
+
+ // check if the slave is present
+ if (serial_read_pin()) {
+ // slave failed to pull the line low, assume not present
+ dprintf("serial::NO_RESPONSE\n");
+ chSysUnlock();
+ return TRANSACTION_NO_RESPONSE;
+ }
+
+ // if the slave is present syncronize with it
+
+ uint8_t checksum = 0;
+ // send data to the slave
+ serial_write_byte(sstd_index); // first chunk is transaction id
+ sync_recv();
+
+ for (int i = 0; i < trans->initiator2target_buffer_size; ++i) {
+ serial_write_byte(split_trans_initiator2target_buffer(trans)[i]);
+ sync_recv();
+ checksum += split_trans_initiator2target_buffer(trans)[i];
+ }
+ serial_write_byte(checksum ^ 7);
+ sync_recv();
+
+ serial_delay();
+ serial_delay(); // read mid pulses
+
+ // receive data from the slave
+ uint8_t checksum_computed = 0;
+ for (int i = 0; i < trans->target2initiator_buffer_size; ++i) {
+ split_trans_target2initiator_buffer(trans)[i] = serial_read_byte();
+ sync_recv();
+ checksum_computed += split_trans_target2initiator_buffer(trans)[i];
+ }
+ checksum_computed ^= 7;
+ uint8_t checksum_received = serial_read_byte();
+
+ sync_recv();
+ serial_delay();
+
+ if ((checksum_computed) != (checksum_received)) {
+ dprintf("serial::FAIL[%u,%u,%u]\n", checksum_computed, checksum_received, sstd_index);
+ serial_output();
+ serial_high();
+
+ chSysUnlock();
+ return TRANSACTION_DATA_ERROR;
+ }
+
+ // always, release the line when not in use
+ serial_high();
+ serial_output();
+
+ chSysUnlock();
+ return TRANSACTION_END;
+}
diff --git a/platforms/chibios/drivers/serial_usart.c b/platforms/chibios/drivers/serial_usart.c
new file mode 100644
index 0000000000..ea4473791c
--- /dev/null
+++ b/platforms/chibios/drivers/serial_usart.c
@@ -0,0 +1,318 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "serial_usart.h"
+
+#if defined(SERIAL_USART_CONFIG)
+static SerialConfig serial_config = SERIAL_USART_CONFIG;
+#else
+static SerialConfig serial_config = {
+ .speed = (SERIAL_USART_SPEED), /* speed - mandatory */
+ .cr1 = (SERIAL_USART_CR1),
+ .cr2 = (SERIAL_USART_CR2),
+# if !defined(SERIAL_USART_FULL_DUPLEX)
+ .cr3 = ((SERIAL_USART_CR3) | USART_CR3_HDSEL) /* activate half-duplex mode */
+# else
+ .cr3 = (SERIAL_USART_CR3)
+# endif
+};
+#endif
+
+static SerialDriver* serial_driver = &SERIAL_USART_DRIVER;
+
+static inline bool react_to_transactions(void);
+static inline bool __attribute__((nonnull)) receive(uint8_t* destination, const size_t size);
+static inline bool __attribute__((nonnull)) send(const uint8_t* source, const size_t size);
+static inline int initiate_transaction(uint8_t sstd_index);
+static inline void usart_clear(void);
+
+/**
+ * @brief Clear the receive input queue.
+ */
+static inline void usart_clear(void) {
+ osalSysLock();
+ bool volatile queue_not_empty = !iqIsEmptyI(&serial_driver->iqueue);
+ osalSysUnlock();
+
+ while (queue_not_empty) {
+ osalSysLock();
+ /* Hard reset the input queue. */
+ iqResetI(&serial_driver->iqueue);
+ osalSysUnlock();
+ /* Allow pending interrupts to preempt.
+ * Do not merge the lock/unlock blocks into one
+ * or the code will not work properly.
+ * The empty read adds a tiny amount of delay. */
+ (void)queue_not_empty;
+ osalSysLock();
+ queue_not_empty = !iqIsEmptyI(&serial_driver->iqueue);
+ osalSysUnlock();
+ }
+}
+
+/**
+ * @brief Blocking send of buffer with timeout.
+ *
+ * @return true Send success.
+ * @return false Send failed.
+ */
+static inline bool send(const uint8_t* source, const size_t size) {
+ bool success = (size_t)sdWriteTimeout(serial_driver, source, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
+
+#if !defined(SERIAL_USART_FULL_DUPLEX)
+ if (success) {
+ /* Half duplex fills the input queue with the data we wrote - just throw it away.
+ Under the right circumstances (e.g. bad cables paired with high baud rates)
+ less bytes can be present in the input queue, therefore a timeout is needed. */
+ uint8_t dump[size];
+ return receive(dump, size);
+ }
+#endif
+
+ return success;
+}
+
+/**
+ * @brief Blocking receive of size * bytes with timeout.
+ *
+ * @return true Receive success.
+ * @return false Receive failed.
+ */
+static inline bool receive(uint8_t* destination, const size_t size) {
+ bool success = (size_t)sdReadTimeout(serial_driver, destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
+ return success;
+}
+
+#if !defined(SERIAL_USART_FULL_DUPLEX)
+
+/**
+ * @brief Initiate pins for USART peripheral. Half-duplex configuration.
+ */
+__attribute__((weak)) void usart_init(void) {
+# if defined(MCU_STM32)
+# if defined(USE_GPIOV1)
+ palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+# else
+ palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_TX_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
+# endif
+
+# if defined(USART_REMAP)
+ USART_REMAP;
+# endif
+# else
+# pragma message "usart_init: MCU Familiy not supported by default, please supply your own init code by implementing usart_init() in your keyboard files."
+# endif
+}
+
+#else
+
+/**
+ * @brief Initiate pins for USART peripheral. Full-duplex configuration.
+ */
+__attribute__((weak)) void usart_init(void) {
+# if defined(MCU_STM32)
+# if defined(USE_GPIOV1)
+ palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_STM32_ALTERNATE_PUSHPULL);
+ palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_INPUT);
+# else
+ palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_TX_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
+ palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_RX_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
+# endif
+
+# if defined(USART_REMAP)
+ USART_REMAP;
+# endif
+# else
+# pragma message "usart_init: MCU Familiy not supported by default, please supply your own init code by implementing usart_init() in your keyboard files."
+# endif
+}
+
+#endif
+
+/**
+ * @brief Overridable master specific initializations.
+ */
+__attribute__((weak, nonnull)) void usart_master_init(SerialDriver** driver) {
+ (void)driver;
+ usart_init();
+}
+
+/**
+ * @brief Overridable slave specific initializations.
+ */
+__attribute__((weak, nonnull)) void usart_slave_init(SerialDriver** driver) {
+ (void)driver;
+ usart_init();
+}
+
+/**
+ * @brief This thread runs on the slave and responds to transactions initiated
+ * by the master.
+ */
+static THD_WORKING_AREA(waSlaveThread, 1024);
+static THD_FUNCTION(SlaveThread, arg) {
+ (void)arg;
+ chRegSetThreadName("usart_tx_rx");
+
+ while (true) {
+ if (!react_to_transactions()) {
+ /* Clear the receive queue, to start with a clean slate.
+ * Parts of failed transactions or spurious bytes could still be in it. */
+ usart_clear();
+ }
+ }
+}
+
+/**
+ * @brief Slave specific initializations.
+ */
+void soft_serial_target_init(void) {
+ usart_slave_init(&serial_driver);
+
+ sdStart(serial_driver, &serial_config);
+
+ /* Start transport thread. */
+ chThdCreateStatic(waSlaveThread, sizeof(waSlaveThread), HIGHPRIO, SlaveThread, NULL);
+}
+
+/**
+ * @brief React to transactions started by the master.
+ */
+static inline bool react_to_transactions(void) {
+ /* Wait until there is a transaction for us. */
+ uint8_t sstd_index = (uint8_t)sdGet(serial_driver);
+
+ /* Sanity check that we are actually responding to a valid transaction. */
+ if (sstd_index >= NUM_TOTAL_TRANSACTIONS) {
+ return false;
+ }
+
+ split_transaction_desc_t* trans = &split_transaction_table[sstd_index];
+
+ /* Send back the handshake which is XORed as a simple checksum,
+ to signal that the slave is ready to receive possible transaction buffers */
+ sstd_index ^= HANDSHAKE_MAGIC;
+ if (!send(&sstd_index, sizeof(sstd_index))) {
+ *trans->status = TRANSACTION_DATA_ERROR;
+ return false;
+ }
+
+ /* Receive transaction buffer from the master. If this transaction requires it.*/
+ if (trans->initiator2target_buffer_size) {
+ if (!receive(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+ *trans->status = TRANSACTION_DATA_ERROR;
+ return false;
+ }
+ }
+
+ /* Allow any slave processing to occur. */
+ if (trans->slave_callback) {
+ trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size, split_trans_target2initiator_buffer(trans));
+ }
+
+ /* Send transaction buffer to the master. If this transaction requires it. */
+ if (trans->target2initiator_buffer_size) {
+ if (!send(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+ *trans->status = TRANSACTION_DATA_ERROR;
+ return false;
+ }
+ }
+
+ *trans->status = TRANSACTION_ACCEPTED;
+ return true;
+}
+
+/**
+ * @brief Master specific initializations.
+ */
+void soft_serial_initiator_init(void) {
+ usart_master_init(&serial_driver);
+
+#if defined(MCU_STM32) && defined(SERIAL_USART_PIN_SWAP)
+ serial_config.cr2 |= USART_CR2_SWAP; // master has swapped TX/RX pins
+#endif
+
+ sdStart(serial_driver, &serial_config);
+}
+
+/**
+ * @brief Start transaction from the master half to the slave half.
+ *
+ * @param index Transaction Table index of the transaction to start.
+ * @return int TRANSACTION_NO_RESPONSE in case of Timeout.
+ * TRANSACTION_TYPE_ERROR in case of invalid transaction index.
+ * TRANSACTION_END in case of success.
+ */
+int soft_serial_transaction(int index) {
+ /* Clear the receive queue, to start with a clean slate.
+ * Parts of failed transactions or spurious bytes could still be in it. */
+ usart_clear();
+ return initiate_transaction((uint8_t)index);
+}
+
+/**
+ * @brief Initiate transaction to slave half.
+ */
+static inline int initiate_transaction(uint8_t sstd_index) {
+ /* Sanity check that we are actually starting a valid transaction. */
+ if (sstd_index >= NUM_TOTAL_TRANSACTIONS) {
+ dprintln("USART: Illegal transaction Id.");
+ return TRANSACTION_TYPE_ERROR;
+ }
+
+ split_transaction_desc_t* trans = &split_transaction_table[sstd_index];
+
+ /* Transaction is not registered. Abort. */
+ if (!trans->status) {
+ dprintln("USART: Transaction not registered.");
+ return TRANSACTION_TYPE_ERROR;
+ }
+
+ /* Send transaction table index to the slave, which doubles as basic handshake token. */
+ if (!send(&sstd_index, sizeof(sstd_index))) {
+ dprintln("USART: Send Handshake failed.");
+ return TRANSACTION_TYPE_ERROR;
+ }
+
+ uint8_t sstd_index_shake = 0xFF;
+
+ /* Which we always read back first so that we can error out correctly.
+ * - due to the half duplex limitations on return codes, we always have to read *something*.
+ * - without the read, write only transactions *always* succeed, even during the boot process where the slave is not ready.
+ */
+ if (!receive(&sstd_index_shake, sizeof(sstd_index_shake)) || (sstd_index_shake != (sstd_index ^ HANDSHAKE_MAGIC))) {
+ dprintln("USART: Handshake failed.");
+ return TRANSACTION_NO_RESPONSE;
+ }
+
+ /* Send transaction buffer to the slave. If this transaction requires it. */
+ if (trans->initiator2target_buffer_size) {
+ if (!send(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+ dprintln("USART: Send failed.");
+ return TRANSACTION_NO_RESPONSE;
+ }
+ }
+
+ /* Receive transaction buffer from the slave. If this transaction requires it. */
+ if (trans->target2initiator_buffer_size) {
+ if (!receive(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+ dprintln("USART: Receive failed.");
+ return TRANSACTION_NO_RESPONSE;
+ }
+ }
+
+ return TRANSACTION_END;
+}
diff --git a/platforms/chibios/drivers/serial_usart.h b/platforms/chibios/drivers/serial_usart.h
new file mode 100644
index 0000000000..c64e15566f
--- /dev/null
+++ b/platforms/chibios/drivers/serial_usart.h
@@ -0,0 +1,116 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+#include "serial.h"
+#include "printf.h"
+
+#include <ch.h>
+#include <hal.h>
+
+#if !defined(SERIAL_USART_DRIVER)
+# define SERIAL_USART_DRIVER SD1
+#endif
+
+#if !defined(USE_GPIOV1)
+/* The default PAL alternate modes are used to signal that the pins are used for USART. */
+# if !defined(SERIAL_USART_TX_PAL_MODE)
+# define SERIAL_USART_TX_PAL_MODE 7
+# endif
+# if !defined(SERIAL_USART_RX_PAL_MODE)
+# define SERIAL_USART_RX_PAL_MODE 7
+# endif
+#endif
+
+#if defined(SOFT_SERIAL_PIN)
+# define SERIAL_USART_TX_PIN SOFT_SERIAL_PIN
+#endif
+
+#if !defined(SERIAL_USART_TX_PIN)
+# define SERIAL_USART_TX_PIN A9
+#endif
+
+#if !defined(SERIAL_USART_RX_PIN)
+# define SERIAL_USART_RX_PIN A10
+#endif
+
+#if !defined(USART_CR1_M0)
+# define USART_CR1_M0 USART_CR1_M // some platforms (f1xx) dont have this so
+#endif
+
+#if !defined(SERIAL_USART_CR1)
+# define SERIAL_USART_CR1 (USART_CR1_PCE | USART_CR1_PS | USART_CR1_M0) // parity enable, odd parity, 9 bit length
+#endif
+
+#if !defined(SERIAL_USART_CR2)
+# define SERIAL_USART_CR2 (USART_CR2_STOP_1) // 2 stop bits
+#endif
+
+#if !defined(SERIAL_USART_CR3)
+# define SERIAL_USART_CR3 0
+#endif
+
+#if defined(USART1_REMAP)
+# define USART_REMAP \
+ do { \
+ (AFIO->MAPR |= AFIO_MAPR_USART1_REMAP); \
+ } while (0)
+#elif defined(USART2_REMAP)
+# define USART_REMAP \
+ do { \
+ (AFIO->MAPR |= AFIO_MAPR_USART2_REMAP); \
+ } while (0)
+#elif defined(USART3_PARTIALREMAP)
+# define USART_REMAP \
+ do { \
+ (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_PARTIALREMAP); \
+ } while (0)
+#elif defined(USART3_FULLREMAP)
+# define USART_REMAP \
+ do { \
+ (AFIO->MAPR |= AFIO_MAPR_USART3_REMAP_FULLREMAP); \
+ } while (0)
+#endif
+
+#if !defined(SELECT_SOFT_SERIAL_SPEED)
+# define SELECT_SOFT_SERIAL_SPEED 1
+#endif
+
+#if defined(SERIAL_USART_SPEED)
+// Allow advanced users to directly set SERIAL_USART_SPEED
+#elif SELECT_SOFT_SERIAL_SPEED == 0
+# define SERIAL_USART_SPEED 460800
+#elif SELECT_SOFT_SERIAL_SPEED == 1
+# define SERIAL_USART_SPEED 230400
+#elif SELECT_SOFT_SERIAL_SPEED == 2
+# define SERIAL_USART_SPEED 115200
+#elif SELECT_SOFT_SERIAL_SPEED == 3
+# define SERIAL_USART_SPEED 57600
+#elif SELECT_SOFT_SERIAL_SPEED == 4
+# define SERIAL_USART_SPEED 38400
+#elif SELECT_SOFT_SERIAL_SPEED == 5
+# define SERIAL_USART_SPEED 19200
+#else
+# error invalid SELECT_SOFT_SERIAL_SPEED value
+#endif
+
+#if !defined(SERIAL_USART_TIMEOUT)
+# define SERIAL_USART_TIMEOUT 100
+#endif
+
+#define HANDSHAKE_MAGIC 7
diff --git a/platforms/chibios/drivers/spi_master.c b/platforms/chibios/drivers/spi_master.c
new file mode 100644
index 0000000000..28ddcbb2ba
--- /dev/null
+++ b/platforms/chibios/drivers/spi_master.c
@@ -0,0 +1,202 @@
+/* Copyright 2020 Nick Brassel (tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "spi_master.h"
+
+#include "timer.h"
+
+static pin_t currentSlavePin = NO_PIN;
+
+#if defined(K20x) || defined(KL2x)
+static SPIConfig spiConfig = {NULL, 0, 0, 0};
+#else
+static SPIConfig spiConfig = {false, NULL, 0, 0, 0, 0};
+#endif
+
+__attribute__((weak)) void spi_init(void) {
+ static bool is_initialised = false;
+ if (!is_initialised) {
+ is_initialised = true;
+
+ // Try releasing special pins for a short time
+ setPinInput(SPI_SCK_PIN);
+ setPinInput(SPI_MOSI_PIN);
+ setPinInput(SPI_MISO_PIN);
+
+ chThdSleepMilliseconds(10);
+#if defined(USE_GPIOV1)
+ palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), SPI_SCK_PAL_MODE);
+ palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), SPI_MOSI_PAL_MODE);
+ palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), SPI_MISO_PAL_MODE);
+#else
+ palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), PAL_MODE_ALTERNATE(SPI_SCK_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
+ palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), PAL_MODE_ALTERNATE(SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
+ palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), PAL_MODE_ALTERNATE(SPI_MISO_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
+#endif
+ }
+}
+
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
+ if (currentSlavePin != NO_PIN || slavePin == NO_PIN) {
+ return false;
+ }
+
+ uint16_t roundedDivisor = 2;
+ while (roundedDivisor < divisor) {
+ roundedDivisor <<= 1;
+ }
+
+ if (roundedDivisor < 2 || roundedDivisor > 256) {
+ return false;
+ }
+
+#if defined(K20x) || defined(KL2x)
+ spiConfig.tar0 = SPIx_CTARn_FMSZ(7) | SPIx_CTARn_ASC(1);
+
+ if (lsbFirst) {
+ spiConfig.tar0 |= SPIx_CTARn_LSBFE;
+ }
+
+ switch (mode) {
+ case 0:
+ break;
+ case 1:
+ spiConfig.tar0 |= SPIx_CTARn_CPHA;
+ break;
+ case 2:
+ spiConfig.tar0 |= SPIx_CTARn_CPOL;
+ break;
+ case 3:
+ spiConfig.tar0 |= SPIx_CTARn_CPHA | SPIx_CTARn_CPOL;
+ break;
+ }
+
+ switch (roundedDivisor) {
+ case 2:
+ spiConfig.tar0 |= SPIx_CTARn_BR(0);
+ break;
+ case 4:
+ spiConfig.tar0 |= SPIx_CTARn_BR(1);
+ break;
+ case 8:
+ spiConfig.tar0 |= SPIx_CTARn_BR(3);
+ break;
+ case 16:
+ spiConfig.tar0 |= SPIx_CTARn_BR(4);
+ break;
+ case 32:
+ spiConfig.tar0 |= SPIx_CTARn_BR(5);
+ break;
+ case 64:
+ spiConfig.tar0 |= SPIx_CTARn_BR(6);
+ break;
+ case 128:
+ spiConfig.tar0 |= SPIx_CTARn_BR(7);
+ break;
+ case 256:
+ spiConfig.tar0 |= SPIx_CTARn_BR(8);
+ break;
+ }
+#else
+ spiConfig.cr1 = 0;
+
+ if (lsbFirst) {
+ spiConfig.cr1 |= SPI_CR1_LSBFIRST;
+ }
+
+ switch (mode) {
+ case 0:
+ break;
+ case 1:
+ spiConfig.cr1 |= SPI_CR1_CPHA;
+ break;
+ case 2:
+ spiConfig.cr1 |= SPI_CR1_CPOL;
+ break;
+ case 3:
+ spiConfig.cr1 |= SPI_CR1_CPHA | SPI_CR1_CPOL;
+ break;
+ }
+
+ switch (roundedDivisor) {
+ case 2:
+ break;
+ case 4:
+ spiConfig.cr1 |= SPI_CR1_BR_0;
+ break;
+ case 8:
+ spiConfig.cr1 |= SPI_CR1_BR_1;
+ break;
+ case 16:
+ spiConfig.cr1 |= SPI_CR1_BR_1 | SPI_CR1_BR_0;
+ break;
+ case 32:
+ spiConfig.cr1 |= SPI_CR1_BR_2;
+ break;
+ case 64:
+ spiConfig.cr1 |= SPI_CR1_BR_2 | SPI_CR1_BR_0;
+ break;
+ case 128:
+ spiConfig.cr1 |= SPI_CR1_BR_2 | SPI_CR1_BR_1;
+ break;
+ case 256:
+ spiConfig.cr1 |= SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0;
+ break;
+ }
+#endif
+
+ currentSlavePin = slavePin;
+ spiConfig.ssport = PAL_PORT(slavePin);
+ spiConfig.sspad = PAL_PAD(slavePin);
+
+ setPinOutput(slavePin);
+ spiStart(&SPI_DRIVER, &spiConfig);
+ spiSelect(&SPI_DRIVER);
+
+ return true;
+}
+
+spi_status_t spi_write(uint8_t data) {
+ uint8_t rxData;
+ spiExchange(&SPI_DRIVER, 1, &data, &rxData);
+
+ return rxData;
+}
+
+spi_status_t spi_read(void) {
+ uint8_t data = 0;
+ spiReceive(&SPI_DRIVER, 1, &data);
+
+ return data;
+}
+
+spi_status_t spi_transmit(const uint8_t *data, uint16_t length) {
+ spiSend(&SPI_DRIVER, length, data);
+ return SPI_STATUS_SUCCESS;
+}
+
+spi_status_t spi_receive(uint8_t *data, uint16_t length) {
+ spiReceive(&SPI_DRIVER, length, data);
+ return SPI_STATUS_SUCCESS;
+}
+
+void spi_stop(void) {
+ if (currentSlavePin != NO_PIN) {
+ spiUnselect(&SPI_DRIVER);
+ spiStop(&SPI_DRIVER);
+ currentSlavePin = NO_PIN;
+ }
+}
diff --git a/platforms/chibios/drivers/spi_master.h b/platforms/chibios/drivers/spi_master.h
new file mode 100644
index 0000000000..b5a6ef1437
--- /dev/null
+++ b/platforms/chibios/drivers/spi_master.h
@@ -0,0 +1,93 @@
+/* Copyright 2020 Nick Brassel (tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <ch.h>
+#include <hal.h>
+#include <stdbool.h>
+
+#include "gpio.h"
+#include "chibios_config.h"
+
+#ifndef SPI_DRIVER
+# define SPI_DRIVER SPID2
+#endif
+
+#ifndef SPI_SCK_PIN
+# define SPI_SCK_PIN B13
+#endif
+
+#ifndef SPI_SCK_PAL_MODE
+# if defined(USE_GPIOV1)
+# define SPI_SCK_PAL_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+# else
+# define SPI_SCK_PAL_MODE 5
+# endif
+#endif
+
+#ifndef SPI_MOSI_PIN
+# define SPI_MOSI_PIN B15
+#endif
+
+#ifndef SPI_MOSI_PAL_MODE
+# if defined(USE_GPIOV1)
+# define SPI_MOSI_PAL_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+# else
+# define SPI_MOSI_PAL_MODE 5
+# endif
+#endif
+
+#ifndef SPI_MISO_PIN
+# define SPI_MISO_PIN B14
+#endif
+
+#ifndef SPI_MISO_PAL_MODE
+# if defined(USE_GPIOV1)
+# define SPI_MISO_PAL_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+# else
+# define SPI_MISO_PAL_MODE 5
+# endif
+#endif
+
+typedef int16_t spi_status_t;
+
+#define SPI_STATUS_SUCCESS (0)
+#define SPI_STATUS_ERROR (-1)
+#define SPI_STATUS_TIMEOUT (-2)
+
+#define SPI_TIMEOUT_IMMEDIATE (0)
+#define SPI_TIMEOUT_INFINITE (0xFFFF)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void spi_init(void);
+
+bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
+
+spi_status_t spi_write(uint8_t data);
+
+spi_status_t spi_read(void);
+
+spi_status_t spi_transmit(const uint8_t *data, uint16_t length);
+
+spi_status_t spi_receive(uint8_t *data, uint16_t length);
+
+void spi_stop(void);
+#ifdef __cplusplus
+}
+#endif
diff --git a/platforms/chibios/drivers/uart.c b/platforms/chibios/drivers/uart.c
new file mode 100644
index 0000000000..030335b342
--- /dev/null
+++ b/platforms/chibios/drivers/uart.c
@@ -0,0 +1,50 @@
+/* Copyright 2021
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "uart.h"
+
+#include "quantum.h"
+
+static SerialConfig serialConfig = {SERIAL_DEFAULT_BITRATE, SD1_CR1, SD1_CR2, SD1_CR3};
+
+void uart_init(uint32_t baud) {
+ static bool is_initialised = false;
+
+ if (!is_initialised) {
+ is_initialised = true;
+
+ serialConfig.speed = baud;
+
+#if defined(USE_GPIOV1)
+ palSetLineMode(SD1_TX_PIN, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+ palSetLineMode(SD1_RX_PIN, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+#else
+ palSetLineMode(SD1_TX_PIN, PAL_MODE_ALTERNATE(SD1_TX_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
+ palSetLineMode(SD1_RX_PIN, PAL_MODE_ALTERNATE(SD1_RX_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN);
+#endif
+ sdStart(&SERIAL_DRIVER, &serialConfig);
+ }
+}
+
+void uart_putchar(uint8_t c) { sdPut(&SERIAL_DRIVER, c); }
+
+uint8_t uart_getchar(void) {
+ msg_t res = sdGet(&SERIAL_DRIVER);
+
+ return (uint8_t)res;
+}
+
+bool uart_available(void) { return !sdGetWouldBlock(&SERIAL_DRIVER); }
diff --git a/platforms/chibios/drivers/uart.h b/platforms/chibios/drivers/uart.h
new file mode 100644
index 0000000000..b4e20e9fd3
--- /dev/null
+++ b/platforms/chibios/drivers/uart.h
@@ -0,0 +1,77 @@
+/* Copyright 2021
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include <hal.h>
+
+#ifndef SERIAL_DRIVER
+# define SERIAL_DRIVER SD1
+#endif
+
+#ifndef SD1_TX_PIN
+# define SD1_TX_PIN A9
+#endif
+
+#ifndef SD1_TX_PAL_MODE
+# define SD1_TX_PAL_MODE 7
+#endif
+
+#ifndef SD1_RX_PIN
+# define SD1_RX_PIN A10
+#endif
+
+#ifndef SD1_RX_PAL_MODE
+# define SD1_RX_PAL_MODE 7
+#endif
+
+#ifndef SD1_CTS_PIN
+# define SD1_CTS_PIN A11
+#endif
+
+#ifndef SD1_CTS_PAL_MODE
+# define SD1_CTS_PAL_MODE 7
+#endif
+
+#ifndef SD1_RTS_PIN
+# define SD1_RTS_PIN A12
+#endif
+
+#ifndef SD1_RTS_PAL_MODE
+# define SD1_RTS_PAL_MODE 7
+#endif
+
+#ifndef SD1_CR1
+# define SD1_CR1 0
+#endif
+
+#ifndef SD1_CR2
+# define SD1_CR2 0
+#endif
+
+#ifndef SD1_CR3
+# define SD1_CR3 0
+#endif
+
+void uart_init(uint32_t baud);
+
+void uart_putchar(uint8_t c);
+
+uint8_t uart_getchar(void);
+
+bool uart_available(void);
diff --git a/platforms/chibios/drivers/usbpd_stm32g4.c b/platforms/chibios/drivers/usbpd_stm32g4.c
new file mode 100644
index 0000000000..f16ca8aeae
--- /dev/null
+++ b/platforms/chibios/drivers/usbpd_stm32g4.c
@@ -0,0 +1,76 @@
+/* Copyright 2021 Nick Brassel (@tzarc)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <quantum.h>
+
+#ifndef USBPD_UCPD1_CFG1
+# define USBPD_UCPD1_CFG1 (UCPD_CFG1_PSC_UCPDCLK_0 | UCPD_CFG1_TRANSWIN_3 | UCPD_CFG1_IFRGAP_4 | UCPD_CFG1_HBITCLKDIV_4)
+#endif // USBPD_UCPD1_CFG1
+
+// Initialises the USBPD subsystem
+__attribute__((weak)) void usbpd_init(void) {
+ // Disable dead-battery signals
+ PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
+ // Enable the clock for the UCPD1 peripheral
+ RCC->APB1ENR2 |= RCC_APB1ENR2_UCPD1EN;
+
+ // Copy the existing value
+ uint32_t CFG1 = UCPD1->CFG1;
+ // Force-disable UCPD1 before configuring
+ CFG1 &= ~UCPD_CFG1_UCPDEN;
+ // Configure UCPD1
+ CFG1 = USBPD_UCPD1_CFG1;
+ // Apply the changes
+ UCPD1->CFG1 = CFG1;
+ // Enable UCPD1
+ UCPD1->CFG1 |= UCPD_CFG1_UCPDEN;
+
+ // Copy the existing value
+ uint32_t CR = UCPD1->CR;
+ // Clear out ANASUBMODE (irrelevant as a sink device)
+ CR &= ~UCPD_CR_ANASUBMODE_Msk;
+ // Advertise our capabilities as a sink, with both CC lines enabled
+ CR |= UCPD_CR_ANAMODE | UCPD_CR_CCENABLE_Msk;
+ // Apply the changes
+ UCPD1->CR = CR;
+}
+
+// Gets the current state of the USBPD allowance
+__attribute__((weak)) usbpd_allowance_t usbpd_get_allowance(void) {
+ uint32_t CR = UCPD1->CR;
+
+ int ucpd_enabled = (UCPD1->CFG1 & UCPD_CFG1_UCPDEN_Msk) >> UCPD_CFG1_UCPDEN_Pos;
+ int anamode = (CR & UCPD_CR_ANAMODE_Msk) >> UCPD_CR_ANAMODE_Pos;
+ int cc_enabled = (CR & UCPD_CR_CCENABLE_Msk) >> UCPD_CR_CCENABLE_Pos;
+
+ if (ucpd_enabled && anamode && cc_enabled) {
+ uint32_t SR = UCPD1->SR;
+ int vstate_cc1 = (SR & UCPD_SR_TYPEC_VSTATE_CC1_Msk) >> UCPD_SR_TYPEC_VSTATE_CC1_Pos;
+ int vstate_cc2 = (SR & UCPD_SR_TYPEC_VSTATE_CC2_Msk) >> UCPD_SR_TYPEC_VSTATE_CC2_Pos;
+ int vstate_max = vstate_cc1 > vstate_cc2 ? vstate_cc1 : vstate_cc2;
+ switch (vstate_max) {
+ case 0:
+ case 1:
+ return USBPD_500MA; // Note that this is 500mA (i.e. max USB 2.0), not 900mA, as we're not using USB 3.1 as a sink device.
+ case 2:
+ return USBPD_1500MA;
+ case 3:
+ return USBPD_3000MA;
+ }
+ }
+
+ return USBPD_500MA;
+} \ No newline at end of file
diff --git a/platforms/chibios/drivers/ws2812.c b/platforms/chibios/drivers/ws2812.c
new file mode 100644
index 0000000000..0d12e2fb79
--- /dev/null
+++ b/platforms/chibios/drivers/ws2812.c
@@ -0,0 +1,114 @@
+#include "quantum.h"
+#include "ws2812.h"
+#include <ch.h>
+#include <hal.h>
+
+/* Adapted from https://github.com/bigjosh/SimpleNeoPixelDemo/ */
+
+#ifndef NOP_FUDGE
+# if defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX)
+# define NOP_FUDGE 0.4
+# else
+# error("NOP_FUDGE configuration required")
+# define NOP_FUDGE 1 // this just pleases the compile so the above error is easier to spot
+# endif
+#endif
+
+// Push Pull or Open Drain Configuration
+// Default Push Pull
+#ifndef WS2812_EXTERNAL_PULLUP
+# define WS2812_OUTPUT_MODE PAL_MODE_OUTPUT_PUSHPULL
+#else
+# define WS2812_OUTPUT_MODE PAL_MODE_OUTPUT_OPENDRAIN
+#endif
+
+#define NUMBER_NOPS 6
+#define CYCLES_PER_SEC (STM32_SYSCLK / NUMBER_NOPS * NOP_FUDGE)
+#define NS_PER_SEC (1000000000L) // Note that this has to be SIGNED since we want to be able to check for negative values of derivatives
+#define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC)
+#define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE)
+
+#define wait_ns(x) \
+ do { \
+ for (int i = 0; i < NS_TO_CYCLES(x); i++) { \
+ __asm__ volatile("nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t" \
+ "nop\n\t"); \
+ } \
+ } while (0)
+
+// These are the timing constraints taken mostly from the WS2812 datasheets
+// These are chosen to be conservative and avoid problems rather than for maximum throughput
+
+#define T1H 900 // Width of a 1 bit in ns
+#define T1L (1250 - T1H) // Width of a 1 bit in ns
+
+#define T0H 350 // Width of a 0 bit in ns
+#define T0L (1250 - T0H) // Width of a 0 bit in ns
+
+// The reset gap can be 6000 ns, but depending on the LED strip it may have to be increased
+// to values like 600000 ns. If it is too small, the pixels will show nothing most of the time.
+#define RES (1000 * WS2812_TRST_US) // Width of the low gap between bits to cause a frame to latch
+
+void sendByte(uint8_t byte) {
+ // WS2812 protocol wants most significant bits first
+ for (unsigned char bit = 0; bit < 8; bit++) {
+ bool is_one = byte & (1 << (7 - bit));
+ // using something like wait_ns(is_one ? T1L : T0L) here throws off timings
+ if (is_one) {
+ // 1
+ writePinHigh(RGB_DI_PIN);
+ wait_ns(T1H);
+ writePinLow(RGB_DI_PIN);
+ wait_ns(T1L);
+ } else {
+ // 0
+ writePinHigh(RGB_DI_PIN);
+ wait_ns(T0H);
+ writePinLow(RGB_DI_PIN);
+ wait_ns(T0L);
+ }
+ }
+}
+
+void ws2812_init(void) { palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE); }
+
+// Setleds for standard RGB
+void ws2812_setleds(LED_TYPE *ledarray, uint16_t leds) {
+ static bool s_init = false;
+ if (!s_init) {
+ ws2812_init();
+ s_init = true;
+ }
+
+ // this code is very time dependent, so we need to disable interrupts
+ chSysLock();
+
+ for (uint8_t i = 0; i < leds; i++) {
+ // WS2812 protocol dictates grb order
+#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
+ sendByte(ledarray[i].g);
+ sendByte(ledarray[i].r);
+ sendByte(ledarray[i].b);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
+ sendByte(ledarray[i].r);
+ sendByte(ledarray[i].g);
+ sendByte(ledarray[i].b);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
+ sendByte(ledarray[i].b);
+ sendByte(ledarray[i].g);
+ sendByte(ledarray[i].r);
+#endif
+
+#ifdef RGBW
+ sendByte(ledarray[i].w);
+#endif
+ }
+
+ wait_ns(RES);
+
+ chSysUnlock();
+}
diff --git a/platforms/chibios/drivers/ws2812_pwm.c b/platforms/chibios/drivers/ws2812_pwm.c
new file mode 100644
index 0000000000..e6af55b6b3
--- /dev/null
+++ b/platforms/chibios/drivers/ws2812_pwm.c
@@ -0,0 +1,311 @@
+#include "ws2812.h"
+#include "quantum.h"
+#include <hal.h>
+
+/* Adapted from https://github.com/joewa/WS2812-LED-Driver_ChibiOS/ */
+
+#ifdef RGBW
+# error "RGBW not supported"
+#endif
+
+#ifndef WS2812_PWM_DRIVER
+# define WS2812_PWM_DRIVER PWMD2 // TIMx
+#endif
+#ifndef WS2812_PWM_CHANNEL
+# define WS2812_PWM_CHANNEL 2 // Channel
+#endif
+#ifndef WS2812_PWM_PAL_MODE
+# define WS2812_PWM_PAL_MODE 2 // DI Pin's alternate function value
+#endif
+#ifndef WS2812_DMA_STREAM
+# define WS2812_DMA_STREAM STM32_DMA1_STREAM2 // DMA Stream for TIMx_UP
+#endif
+#ifndef WS2812_DMA_CHANNEL
+# define WS2812_DMA_CHANNEL 2 // DMA Channel for TIMx_UP
+#endif
+#if (STM32_DMA_SUPPORTS_DMAMUX == TRUE) && !defined(WS2812_DMAMUX_ID)
+# error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM?_UP"
+#endif
+
+#ifndef WS2812_PWM_COMPLEMENTARY_OUTPUT
+# define WS2812_PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH
+#else
+# if !STM32_PWM_USE_ADVANCED
+# error "WS2812_PWM_COMPLEMENTARY_OUTPUT requires STM32_PWM_USE_ADVANCED == TRUE"
+# endif
+# define WS2812_PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
+#endif
+
+// Push Pull or Open Drain Configuration
+// Default Push Pull
+#ifndef WS2812_EXTERNAL_PULLUP
+# if defined(USE_GPIOV1)
+# define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+# else
+# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_PWM_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST | PAL_STM32_PUPDR_FLOATING
+# endif
+#else
+# if defined(USE_GPIOV1)
+# define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
+# else
+# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_PWM_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN | PAL_STM32_OSPEED_HIGHEST | PAL_STM32_PUPDR_FLOATING
+# endif
+#endif
+
+#ifndef WS2812_PWM_TARGET_PERIOD
+//# define WS2812_PWM_TARGET_PERIOD 800000 // Original code is 800k...?
+# define WS2812_PWM_TARGET_PERIOD 80000 // TODO: work out why 10x less on f303/f4x1
+#endif
+
+/* --- PRIVATE CONSTANTS ---------------------------------------------------- */
+
+#define WS2812_PWM_FREQUENCY (STM32_SYSCLK / 2) /**< Clock frequency of PWM, must be valid with respect to system clock! */
+#define WS2812_PWM_PERIOD (WS2812_PWM_FREQUENCY / WS2812_PWM_TARGET_PERIOD) /**< Clock period in ticks. 1 / 800kHz = 1.25 uS (as per datasheet) */
+
+/**
+ * @brief Number of bit-periods to hold the data line low at the end of a frame
+ *
+ * The reset period for each frame is defined in WS2812_TRST_US.
+ * Calculate the number of zeroes to add at the end assuming 1.25 uS/bit:
+ */
+#define WS2812_RESET_BIT_N (1000 * WS2812_TRST_US / 1250)
+#define WS2812_COLOR_BIT_N (RGBLED_NUM * 24) /**< Number of data bits */
+#define WS2812_BIT_N (WS2812_COLOR_BIT_N + WS2812_RESET_BIT_N) /**< Total number of bits in a frame */
+
+/**
+ * @brief High period for a zero, in ticks
+ *
+ * Per the datasheet:
+ * WS2812:
+ * - T0H: 200 nS to 500 nS, inclusive
+ * - T0L: 650 nS to 950 nS, inclusive
+ * WS2812B:
+ * - T0H: 200 nS to 500 nS, inclusive
+ * - T0L: 750 nS to 1050 nS, inclusive
+ *
+ * The duty cycle is calculated for a high period of 350 nS.
+ */
+#define WS2812_DUTYCYCLE_0 (WS2812_PWM_FREQUENCY / (1000000000 / 350))
+
+/**
+ * @brief High period for a one, in ticks
+ *
+ * Per the datasheet:
+ * WS2812:
+ * - T1H: 550 nS to 850 nS, inclusive
+ * - T1L: 450 nS to 750 nS, inclusive
+ * WS2812B:
+ * - T1H: 750 nS to 1050 nS, inclusive
+ * - T1L: 200 nS to 500 nS, inclusive
+ *
+ * The duty cycle is calculated for a high period of 800 nS.
+ * This is in the middle of the specifications of the WS2812 and WS2812B.
+ */
+#define WS2812_DUTYCYCLE_1 (WS2812_PWM_FREQUENCY / (1000000000 / 800))
+
+/* --- PRIVATE MACROS ------------------------------------------------------- */
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given bit
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] byte: The byte number [0, 2]
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+#define WS2812_BIT(led, byte, bit) (24 * (led) + 8 * (byte) + (7 - (bit)))
+
+#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
+ *
+ * @note The red byte is the middle byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 1, (bit))
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
+ *
+ * @note The red byte is the first byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 0, (bit))
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
+ *
+ * @note The red byte is the last byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit index [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 2, (bit))
+
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
+ *
+ * @note The red byte is the middle byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 0, (bit))
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
+ *
+ * @note The red byte is the first byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 1, (bit))
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
+ *
+ * @note The red byte is the last byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit index [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 2, (bit))
+
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
+ *
+ * @note The red byte is the middle byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 2, (bit))
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
+ *
+ * @note The red byte is the first byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit number [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 1, (bit))
+
+/**
+ * @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
+ *
+ * @note The red byte is the last byte in the color packet
+ *
+ * @param[in] led: The led index [0, @ref RGBLED_NUM)
+ * @param[in] bit: The bit index [0, 7]
+ *
+ * @return The bit index
+ */
+# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 0, (bit))
+#endif
+
+/* --- PRIVATE VARIABLES ---------------------------------------------------- */
+
+static uint32_t ws2812_frame_buffer[WS2812_BIT_N + 1]; /**< Buffer for a frame */
+
+/* --- PUBLIC FUNCTIONS ----------------------------------------------------- */
+/*
+ * Gedanke: Double-buffer type transactions: double buffer transfers using two memory pointers for
+the memory (while the DMA is reading/writing from/to a buffer, the application can
+write/read to/from the other buffer).
+ */
+
+void ws2812_init(void) {
+ // Initialize led frame buffer
+ uint32_t i;
+ for (i = 0; i < WS2812_COLOR_BIT_N; i++) ws2812_frame_buffer[i] = WS2812_DUTYCYCLE_0; // All color bits are zero duty cycle
+ for (i = 0; i < WS2812_RESET_BIT_N; i++) ws2812_frame_buffer[i + WS2812_COLOR_BIT_N] = 0; // All reset bits are zero
+
+ palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
+
+ // PWM Configuration
+ //#pragma GCC diagnostic ignored "-Woverride-init" // Turn off override-init warning for this struct. We use the overriding ability to set a "default" channel config
+ static const PWMConfig ws2812_pwm_config = {
+ .frequency = WS2812_PWM_FREQUENCY,
+ .period = WS2812_PWM_PERIOD, // Mit dieser Periode wird UDE-Event erzeugt und ein neuer Wert (Länge WS2812_BIT_N) vom DMA ins CCR geschrieben
+ .callback = NULL,
+ .channels =
+ {
+ [0 ... 3] = {.mode = PWM_OUTPUT_DISABLED, .callback = NULL}, // Channels default to disabled
+ [WS2812_PWM_CHANNEL - 1] = {.mode = WS2812_PWM_OUTPUT_MODE, .callback = NULL}, // Turn on the channel we care about
+ },
+ .cr2 = 0,
+ .dier = TIM_DIER_UDE, // DMA on update event for next period
+ };
+ //#pragma GCC diagnostic pop // Restore command-line warning options
+
+ // Configure DMA
+ // dmaInit(); // Joe added this
+ dmaStreamAlloc(WS2812_DMA_STREAM - STM32_DMA_STREAM(0), 10, NULL, NULL);
+ dmaStreamSetPeripheral(WS2812_DMA_STREAM, &(WS2812_PWM_DRIVER.tim->CCR[WS2812_PWM_CHANNEL - 1])); // Ziel ist der An-Zeit im Cap-Comp-Register
+ dmaStreamSetMemory0(WS2812_DMA_STREAM, ws2812_frame_buffer);
+ dmaStreamSetTransactionSize(WS2812_DMA_STREAM, WS2812_BIT_N);
+ dmaStreamSetMode(WS2812_DMA_STREAM, STM32_DMA_CR_CHSEL(WS2812_DMA_CHANNEL) | STM32_DMA_CR_DIR_M2P | STM32_DMA_CR_PSIZE_WORD | STM32_DMA_CR_MSIZE_WORD | STM32_DMA_CR_MINC | STM32_DMA_CR_CIRC | STM32_DMA_CR_PL(3));
+ // M2P: Memory 2 Periph; PL: Priority Level
+
+#if (STM32_DMA_SUPPORTS_DMAMUX == TRUE)
+ // If the MCU has a DMAMUX we need to assign the correct resource
+ dmaSetRequestSource(WS2812_DMA_STREAM, WS2812_DMAMUX_ID);
+#endif
+
+ // Start DMA
+ dmaStreamEnable(WS2812_DMA_STREAM);
+
+ // Configure PWM
+ // NOTE: It's required that preload be enabled on the timer channel CCR register. This is currently enabled in the
+ // ChibiOS driver code, so we don't have to do anything special to the timer. If we did, we'd have to start the timer,
+ // disable counting, enable the channel, and then make whatever configuration changes we need.
+ pwmStart(&WS2812_PWM_DRIVER, &ws2812_pwm_config);
+ pwmEnableChannel(&WS2812_PWM_DRIVER, WS2812_PWM_CHANNEL - 1, 0); // Initial period is 0; output will be low until first duty cycle is DMA'd in
+}
+
+void ws2812_write_led(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b) {
+ // Write color to frame buffer
+ for (uint8_t bit = 0; bit < 8; bit++) {
+ ws2812_frame_buffer[WS2812_RED_BIT(led_number, bit)] = ((r >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
+ ws2812_frame_buffer[WS2812_GREEN_BIT(led_number, bit)] = ((g >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
+ ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
+ }
+}
+
+// Setleds for standard RGB
+void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
+ static bool s_init = false;
+ if (!s_init) {
+ ws2812_init();
+ s_init = true;
+ }
+
+ for (uint16_t i = 0; i < leds; i++) {
+ ws2812_write_led(i, ledarray[i].r, ledarray[i].g, ledarray[i].b);
+ }
+}
diff --git a/platforms/chibios/drivers/ws2812_spi.c b/platforms/chibios/drivers/ws2812_spi.c
new file mode 100644
index 0000000000..377a929b94
--- /dev/null
+++ b/platforms/chibios/drivers/ws2812_spi.c
@@ -0,0 +1,159 @@
+#include "quantum.h"
+#include "ws2812.h"
+
+/* Adapted from https://github.com/gamazeps/ws2812b-chibios-SPIDMA/ */
+
+#ifdef RGBW
+# error "RGBW not supported"
+#endif
+
+// Define the spi your LEDs are plugged to here
+#ifndef WS2812_SPI
+# define WS2812_SPI SPID1
+#endif
+
+#ifndef WS2812_SPI_MOSI_PAL_MODE
+# define WS2812_SPI_MOSI_PAL_MODE 5
+#endif
+
+#ifndef WS2812_SPI_SCK_PAL_MODE
+# define WS2812_SPI_SCK_PAL_MODE 5
+#endif
+
+// Push Pull or Open Drain Configuration
+// Default Push Pull
+#ifndef WS2812_EXTERNAL_PULLUP
+# if defined(USE_GPIOV1)
+# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+# else
+# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
+# endif
+#else
+# if defined(USE_GPIOV1)
+# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
+# else
+# define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN
+# endif
+#endif
+
+// Define SPI config speed
+// baudrate should target 3.2MHz
+// F072 fpclk = 48MHz
+// 48/16 = 3Mhz
+#if WS2812_SPI_DIVISOR == 2
+# define WS2812_SPI_DIVISOR (0)
+#elif WS2812_SPI_DIVISOR == 4
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_0)
+#elif WS2812_SPI_DIVISOR == 8
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1)
+#elif WS2812_SPI_DIVISOR == 16 // same as default
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1 | SPI_CR1_BR_0)
+#elif WS2812_SPI_DIVISOR == 32
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2)
+#elif WS2812_SPI_DIVISOR == 64
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_0)
+#elif WS2812_SPI_DIVISOR == 128
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_1)
+#elif WS2812_SPI_DIVISOR == 256
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0)
+#else
+# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1 | SPI_CR1_BR_0) // default
+#endif
+
+// Use SPI circular buffer
+#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER
+# define WS2812_SPI_BUFFER_MODE 1 // circular buffer
+#else
+# define WS2812_SPI_BUFFER_MODE 0 // normal buffer
+#endif
+
+#if defined(USE_GPIOV1)
+# define WS2812_SCK_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+#else
+# define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_SCK_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
+#endif
+
+#define BYTES_FOR_LED_BYTE 4
+#define NB_COLORS 3
+#define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * NB_COLORS)
+#define DATA_SIZE (BYTES_FOR_LED * RGBLED_NUM)
+#define RESET_SIZE (1000 * WS2812_TRST_US / (2 * 1250))
+#define PREAMBLE_SIZE 4
+
+static uint8_t txbuf[PREAMBLE_SIZE + DATA_SIZE + RESET_SIZE] = {0};
+
+/*
+ * As the trick here is to use the SPI to send a huge pattern of 0 and 1 to
+ * the ws2812b protocol, we use this helper function to translate bytes into
+ * 0s and 1s for the LED (with the appropriate timing).
+ */
+static uint8_t get_protocol_eq(uint8_t data, int pos) {
+ uint8_t eq = 0;
+ if (data & (1 << (2 * (3 - pos))))
+ eq = 0b1110;
+ else
+ eq = 0b1000;
+ if (data & (2 << (2 * (3 - pos))))
+ eq += 0b11100000;
+ else
+ eq += 0b10000000;
+ return eq;
+}
+
+static void set_led_color_rgb(LED_TYPE color, int pos) {
+ uint8_t* tx_start = &txbuf[PREAMBLE_SIZE];
+
+#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.g, j);
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.r, j);
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.b, j);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.r, j);
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.g, j);
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.b, j);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + j] = get_protocol_eq(color.b, j);
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE + j] = get_protocol_eq(color.g, j);
+ for (int j = 0; j < 4; j++) tx_start[BYTES_FOR_LED * pos + BYTES_FOR_LED_BYTE * 2 + j] = get_protocol_eq(color.r, j);
+#endif
+}
+
+void ws2812_init(void) {
+ palSetLineMode(RGB_DI_PIN, WS2812_MOSI_OUTPUT_MODE);
+
+#ifdef WS2812_SPI_SCK_PIN
+ palSetLineMode(WS2812_SPI_SCK_PIN, WS2812_SCK_OUTPUT_MODE);
+#endif // WS2812_SPI_SCK_PIN
+
+ // TODO: more dynamic baudrate
+ static const SPIConfig spicfg = {WS2812_SPI_BUFFER_MODE, NULL, PAL_PORT(RGB_DI_PIN), PAL_PAD(RGB_DI_PIN), WS2812_SPI_DIVISOR};
+
+ spiAcquireBus(&WS2812_SPI); /* Acquire ownership of the bus. */
+ spiStart(&WS2812_SPI, &spicfg); /* Setup transfer parameters. */
+ spiSelect(&WS2812_SPI); /* Slave Select assertion. */
+#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER
+ spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
+#endif
+}
+
+void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
+ static bool s_init = false;
+ if (!s_init) {
+ ws2812_init();
+ s_init = true;
+ }
+
+ for (uint8_t i = 0; i < leds; i++) {
+ set_led_color_rgb(ledarray[i], i);
+ }
+
+ // Send async - each led takes ~0.03ms, 50 leds ~1.5ms, animations flushing faster than send will cause issues.
+ // Instead spiSend can be used to send synchronously (or the thread logic can be added back).
+#ifndef WS2812_SPI_USE_CIRCULAR_BUFFER
+# ifdef WS2812_SPI_SYNC
+ spiSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
+# else
+ spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf);
+# endif
+#endif
+}