diff options
Diffstat (limited to 'platforms/avr')
| -rw-r--r-- | platforms/avr/drivers/apa102.c | 96 | ||||
| -rw-r--r-- | platforms/avr/drivers/serial.c | 5 |
2 files changed, 101 insertions, 0 deletions
diff --git a/platforms/avr/drivers/apa102.c b/platforms/avr/drivers/apa102.c new file mode 100644 index 0000000000..740acb5739 --- /dev/null +++ b/platforms/avr/drivers/apa102.c @@ -0,0 +1,96 @@ +/* + * APA102 lib V1.0a + * + * Controls APA102 RGB-LEDs + * Author: Mikkel (Duckle29 on GitHub) + * + * Dec 22th, 2017 v1.0a Initial Version + * + * 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 "apa102.h" +#include <avr/interrupt.h> +#include <avr/io.h> +#include <util/delay.h> +#include "debug.h" + +// Setleds for standard RGB +void inline apa102_setleds(LED_TYPE *ledarray, uint16_t leds) { apa102_setleds_pin(ledarray, leds, _BV(RGB_DI_PIN & 0xF), _BV(RGB_CLK_PIN & 0xF)); } + +void static inline apa102_setleds_pin(LED_TYPE *ledarray, uint16_t leds, uint8_t pinmask_DI, uint8_t pinmask_CLK) { + setPinOutput(RGB_DI_PIN); + setPinOutput(RGB_CLK_PIN); + + apa102_send_array((uint8_t *)ledarray, leds) +} + +void apa102_send_array(uint8_t *data, uint16_t leds) { // Data is struct of 3 bytes. RGB - leds is number of leds in data + apa102_start_frame(); + while (leds--) { + apa102_send_frame(0xFF000000 | (data->b << 16) | (data->g << 8) | data->r); + data++; + } + apa102_end_frame(leds); +} + +void apa102_send_frame(uint32_t frame) { + for (uint32_t i = 0xFF; i > 0;) { + apa102_send_byte(frame & i); + i = i << 8; + } +} + +void apa102_start_frame() { apa102_send_frame(0); } + +void apa102_end_frame(uint16_t leds) { + // This function has been taken from: https://github.com/pololu/apa102-arduino/blob/master/APA102.h + // and adapted. The code is MIT licensed. I think thats compatible? + + // We need to send some more bytes to ensure that all the LEDs in the + // chain see their new color and start displaying it. + // + // The data stream seen by the last LED in the chain will be delayed by + // (count - 1) clock edges, because each LED before it inverts the clock + // line and delays the data by one clock edge. Therefore, to make sure + // the last LED actually receives the data we wrote, the number of extra + // edges we send at the end of the frame must be at least (count - 1). + // For the APA102C, that is sufficient. + // + // The SK9822 only updates after it sees 32 zero bits followed by one more + // rising edge. To avoid having the update time depend on the color of + // the last LED, we send a dummy 0xFF byte. (Unfortunately, this means + // that partial updates of the beginning of an LED strip are not possible; + // the LED after the last one you are trying to update will be black.) + // After that, to ensure that the last LED in the chain sees 32 zero bits + // and a rising edge, we need to send at least 65 + (count - 1) edges. It + // is sufficent and simpler to just send (5 + count/16) bytes of zeros. + // + // We are ignoring the specification for the end frame in the APA102/SK9822 + // datasheets because it does not actually ensure that all the LEDs will + // start displaying their new colors right away. + + apa102_send_byte(0xFF); + for (uint16_t i = 0; i < 5 + leds / 16; i++) { + apa102_send_byte(0); + } +} + +void apa102_send_byte(uint8_t byte) { + uint8_t i; + for (i = 0; i < 8; i++) { + writePin(RGB_DI_PIN, !!(byte & (1 << (7 - i)))); + writePinHigh(RGB_CLK_PIN); + } +} diff --git a/platforms/avr/drivers/serial.c b/platforms/avr/drivers/serial.c index 6a36aa5f7f..31eab7b7c0 100644 --- a/platforms/avr/drivers/serial.c +++ b/platforms/avr/drivers/serial.c @@ -53,8 +53,13 @@ # define EICRx EICRA # endif +<<<<<<< HEAD +// ATmegaxxU2 specific config +# if defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) +======= // ATmegaxxU2/AT90USB162 specific config # if defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_AT90USB162__) +>>>>>>> 0.12.52~1 // PD4(INT5), PD6(INT6), PD7(INT7), PC7(INT4) # if SOFT_SERIAL_PIN == D4 # define EIMSK_BIT _BV(INT5) |