5 files changed, 182 insertions, 0 deletions
diff --git a/keyboards/custommk/bonsai_c4_template/bonsai_c4_template.c b/keyboards/custommk/bonsai_c4_template/bonsai_c4_template.c
new file mode 100644
index 0000000000..2129a712cf
--- /dev/null
+++ b/keyboards/custommk/bonsai_c4_template/bonsai_c4_template.c
@@ -0,0 +1,23 @@
+/* Copyright 2022 customMK
+ *
+ * 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/>.
+ */
+
+// Set up SPI slave select pin
+void keyboard_post_init_kb(void) {
+    #ifdef EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN
+        setPinOutput(EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN);
+        writePinHigh(EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN);
+    #endif
+}
diff --git a/keyboards/custommk/bonsai_c4_template/config.h b/keyboards/custommk/bonsai_c4_template/config.h
new file mode 100644
index 0000000000..192e9b0755
--- /dev/null
+++ b/keyboards/custommk/bonsai_c4_template/config.h
@@ -0,0 +1,79 @@
+/* Copyright 2022 customMK
+ *
+ * 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 "config_common.h"
+
+// This file includes example #defines to enable commonly-used functionality 
+// (SPI, PWM backlight, etc.) on specific pins. Capabilities you want to include
+// should be added to the config.h for your keyboard. Not all capabilities are
+// shown; for example:
+// I2C is not shown because the QMK defaults are sufficient for SCL on B6 and SDA on B7
+// Serial communications (for split keyboards) is not shown because QMK defaults work
+// for either pins A15 or B6
+
+// If you need to change pins for PWM, SPI, I2C, or Serial communications, be aware that
+// doing this may require changing the driver, channel, PAL (Pin ALternate function) mode, 
+// DMA stream, and/or DMA channel.
+
+
+// Bonsai C4 wires up pin A9 for Vbus sensing pin by default. For spilt keyboards, this
+// can be used to determine which half of the keyboard is plugged into USB.
+// For boards using Bonsai C4 merely as a reference design, the VBUS sense pin A9
+// can be used for purposes other than Vbus sensing (e.g. the switch
+// matrix).
+//
+// If A9 is needed for Vbus sensing, uncomment the line
+// below. Most keyboards using Bonsai C4 can leave the line below
+// commented out.
+//
+// #undef BOARD_OTG_NOVBUSSENS 
+
+// FRAM configuration
+#define EXTERNAL_EEPROM_SPI_SLAVE_SELECT_PIN A0
+#define EXTERNAL_EEPROM_SPI_CLOCK_DIVISOR 8 // 96MHz / 8 = 12MHz; max supported by MB85R64 is 20MHz
+#define EXTERNAL_EEPROM_PAGE_SIZE 64 // does not matter for FRAM, just sets the RAM buffer size in STM32F chip
+#define DYNAMIC_KEYMAP_EEPROM_MAX_ADDR 8191
+
+// External flash configuration
+#define EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN B12
+#define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR 1  // 96MHz; max supported by W25Q128JV is 133MHz
+#define EXTERNAL_FLASH_BYTE_COUNT (16 * 1024 * 1024)  //128Mbit or 16MByte
+#define EXTERNAL_FLASH_PAGE_SIZE 256
+#define EXTERNAL_FLASH_SPI_TIMEOUT 200000 //datasheet max is 200 seconds for flash chip erase
+
+// SPI Configuration (needed for FRAM and FLASH)
+#define SPI_DRIVER SPID1
+#define SPI_SCK_PIN B3
+#define SPI_MOSI_PIN B5
+#define SPI_MISO_PIN B4
+
+// Example code to set up PWM backlight on pin A6
+// If a different pin is used, a different PWM driver/channel settings may be necessary
+#define BACKLIGHT_PIN A6
+#define BACKLIGHT_PWM_DRIVER PWMD3
+#define BACKLIGHT_PWM_CHANNEL 1
+
+// Example code for WS2812 underglow
+// Only pin A10 is wired to send 5V signals to the WS2812
+// This also usually requires adding special wiring during board assembly
+#define RGB_DI_PIN A10
+#define WS2812_PWM_DRIVER PWMD1
+#define WS2812_PWM_CHANNEL 3
+#define WS2812_PWM_PAL_MODE 1
+#define WS2812_DMA_STREAM STM32_DMA2_STREAM5
+#define WS2812_DMA_CHANNEL 6
diff --git a/keyboards/custommk/bonsai_c4_template/halconf.h b/keyboards/custommk/bonsai_c4_template/halconf.h
new file mode 100644
index 0000000000..a90ea163f3
--- /dev/null
+++ b/keyboards/custommk/bonsai_c4_template/halconf.h
@@ -0,0 +1,35 @@
+/* Copyright 2021 customMK
+ *
+ * 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
+
+// If you are using I2C (e.g. for OLED), include this line
+#define HAL_USE_I2C TRUE
+
+// If you are using PWM (e.g. for WS2812, backlight, etc.) include this line
+#define HAL_USE_PWM TRUE
+
+// If you are using serial comms for split communications, include these lines
+#define HAL_USE_SERIAL TRUE
+#define SERIAL_BUFFERS_SIZE 256
+
+// If you are using SPI (e.g. for FRAM, flash, etc.) include these lines
+#define HAL_USE_SPI TRUE
+#define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
+// This enables interrupt-driven mode
+#define SPI_USE_WAIT TRUE
+
+#include_next <halconf.h>
+\ No newline at end of file
diff --git a/keyboards/custommk/bonsai_c4_template/mcuconf.h b/keyboards/custommk/bonsai_c4_template/mcuconf.h
new file mode 100644
index 0000000000..4f926bd7de
--- /dev/null
+++ b/keyboards/custommk/bonsai_c4_template/mcuconf.h
@@ -0,0 +1,35 @@
+/* Copyright 2022 customMK
+ *
+ * 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_next <mcuconf.h>
+
+// Used for underglow in example code
+#undef STM32_PWM_USE_TIM1 //timer 1 channel 3
+#define STM32_PWM_USE_TIM1 TRUE
+
+// Used for backlight in examples
+#undef STM32_PWM_USE_TIM3 //timer 3 channel 1
+#define STM32_PWM_USE_TIM3 TRUE
+
+// Used for FRAM and flash in example code
+#undef STM32_SPI_USE_SPI1
+#define STM32_SPI_USE_SPI1 TRUE
+
+// Used for Split comms in example code
+#undef STM32_SERIAL_USE_USART1
+#define STM32_SERIAL_USE_USART1 TRUE
+\ No newline at end of file
diff --git a/keyboards/custommk/bonsai_c4_template/readme.md b/keyboards/custommk/bonsai_c4_template/readme.md
new file mode 100644
index 0000000000..0c0fd8ed0c
--- /dev/null
+++ b/keyboards/custommk/bonsai_c4_template/readme.md
@@ -0,0 +1,10 @@
+# Bonsai C4 template code
+
+Currently, the converter for Pro Micro to Bonsai C4 only does pin mapping. This is sufficient for simple keyboards and also a good start for
+incorporating into more advanced keyboards with other features (like RGB, OLED, backlighting, split communiciations, etc.). However, to make
+use of the more advanced features--including using the FRAM and flash memory chip included on Bonsai C4--various peripheral hardware must
+be configured. Pro Micro does not requrie such configuration because such functionality is more limited and hard-wired to specific pins.
+
+The code here provides examples that can be used to operate SPI, I2C, PWM, and Serial comms. In addition to using the converter, you will
+need to take code (as-needed) and add it to existing config.h files, or add in new halconf.h and mcuconf.h files. If you are changing which 
+pins are used for certain functions, you should verify the new pins support that functionality, and check all assingments to ensure the correct settings are used (including as-applicable driver, channel, PAL (Pin ALternate function) mode, DMA stream, and/or DMA channel).