Add Bonsai C4 as a platform board file (#18901)

* Set up Bonsai C4 as a platform board file

* corrections and improvements based on testing and feedback

* Added VBUS sensing as default capability for improved split support using Bonsai C4

* Update clock divisor for SPI flash

Co-authored-by: Nick Brassel <nick@tzarc.org>

Co-authored-by: Nick Brassel <nick@tzarc.org>

14 files changed, 427 insertions, 187 deletions

diff --git a/data/mappings/defaults.hjson b/data/mappings/defaults.hjson
index ea9f6972c5..10657e5aa0 100644
--- a/data/mappings/defaults.hjson
+++ b/data/mappings/defaults.hjson
@@ -70,7 +70,7 @@
         "bonsai_c4": {
             "processor": "STM32F411",
             "bootloader": "stm32-dfu",
-            "board": "GENERIC_STM32_F411XE",
+            "board": "BONSAI_C4",
             "pin_compatible": "promicro"
         }
     }
diff --git a/docs/feature_converters.md b/docs/feature_converters.md
index 3dabae915d..0fa677f873 100644
--- a/docs/feature_converters.md
+++ b/docs/feature_converters.md
@@ -157,8 +157,6 @@ The Bonsai C4 only has one on-board LED (B2), and by default, both the Pro Micro
 #define B0 PAL_LINE(GPIOA, 9)
 ```
 
-No peripherals are enabled by default at this time, but example code to enable SPI, I2C, PWM, and Serial communications can be found [here](/keyboards/custommk/bonsai_c4_template).
-
 ## Elite-C
 
 If a board currently supported in QMK uses an [Elite-C](https://keeb.io/products/elite-c-low-profile-version-usb-c-pro-micro-replacement-atmega32u4), the supported alternative controllers are:
diff --git a/keyboards/custommk/bonsai_c4_template/bonsai_c4_template.c b/keyboards/custommk/bonsai_c4_template/bonsai_c4_template.c
deleted file mode 100644
index 2129a712cf..0000000000
--- a/keyboards/custommk/bonsai_c4_template/bonsai_c4_template.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* 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
deleted file mode 100644
index 192e9b0755..0000000000
--- a/keyboards/custommk/bonsai_c4_template/config.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/* 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
deleted file mode 100644
index a90ea163f3..0000000000
--- a/keyboards/custommk/bonsai_c4_template/halconf.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* 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
deleted file mode 100644
index 4f926bd7de..0000000000
--- a/keyboards/custommk/bonsai_c4_template/mcuconf.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* 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
deleted file mode 100644
index 0c0fd8ed0c..0000000000
--- a/keyboards/custommk/bonsai_c4_template/readme.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# 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).
diff --git a/platforms/chibios/boards/BONSAI_C4/board/board.mk b/platforms/chibios/boards/BONSAI_C4/board/board.mk
new file mode 100644
index 0000000000..bb00b1a2b0
--- /dev/null
+++ b/platforms/chibios/boards/BONSAI_C4/board/board.mk
@@ -0,0 +1,9 @@
+# List of all the board related files.
+BOARDSRC = $(CHIBIOS)/os/hal/boards/ST_NUCLEO64_F411RE/board.c
+
+# Required include directories
+BOARDINC = $(CHIBIOS)/os/hal/boards/ST_NUCLEO64_F411RE
+
+# Shared variables
+ALLCSRC += $(BOARDSRC)
+ALLINC  += $(BOARDINC)
diff --git a/platforms/chibios/boards/BONSAI_C4/configs/board.h b/platforms/chibios/boards/BONSAI_C4/configs/board.h
new file mode 100644
index 0000000000..f1ee51c91f
--- /dev/null
+++ b/platforms/chibios/boards/BONSAI_C4/configs/board.h
@@ -0,0 +1,20 @@
+/* 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_next "board.h"
+
+#undef STM32_HSE_BYPASS
\ No newline at end of file
diff --git a/platforms/chibios/boards/BONSAI_C4/configs/config.h b/platforms/chibios/boards/BONSAI_C4/configs/config.h
new file mode 100644
index 0000000000..e412f73d3d
--- /dev/null
+++ b/platforms/chibios/boards/BONSAI_C4/configs/config.h
@@ -0,0 +1,92 @@
+/* Copyright 2022 David Hoelscher, 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 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
+
+// Bonsai C4 includes Vbus sensing; derived designs that use PA9 for other purposes
+// may disable Vbus sensing with #define BOARD_OTG_NOVBUSSENS 1
+
+#ifndef EARLY_INIT_PERFORM_BOOTLOADER_JUMP
+#    define EARLY_INIT_PERFORM_BOOTLOADER_JUMP TRUE
+#endif
+
+// FRAM configuration
+#ifndef EXTERNAL_EEPROM_SPI_SLAVE_SELECT_PIN
+#    define EXTERNAL_EEPROM_SPI_SLAVE_SELECT_PIN PAL_LINE(GPIOA, 0)
+#    define EXTERNAL_EEPROM_SPI_CLOCK_DIVISOR 8 // 96MHz / 8 = 12MHz; max supported by MB85R64 is 20MHz
+#    define EXTERNAL_EEPROM_BYTE_COUNT 8192
+#    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
+#endif
+
+// External flash configuration
+#ifndef EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN
+#    define EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN PAL_LINE(GPIOB, 12)
+#    define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR 2  // 48MHz; 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
+#endif
+
+// SPI Configuration (needed for FRAM and FLASH)
+#ifndef SPI_DRIVER
+#    define SPI_DRIVER SPID1
+#endif
+#ifndef SPI_SCK_PIN
+#    define SPI_SCK_PIN PAL_LINE(GPIOB, 3)
+#endif
+#ifndef SPI_MOSI_PIN
+#    define SPI_MOSI_PIN PAL_LINE(GPIOB, 5)
+#endif
+#ifndef SPI_MISO_PIN
+#    define SPI_MISO_PIN PAL_LINE(GPIOB, 4)
+#endif
+
+
+// I2C Configuration
+#ifdef CONVERT_TO_BONSAI_C4
+#    ifndef I2C1_SCL_PIN
+#        define I2C1_SCL_PIN PAL_LINE(GPIOB, 6)
+#    endif
+#    ifndef I2C1_SDA_PIN
+#        define I2C1_SDA_PIN PAL_LINE(GPIOB, 9)
+#    endif
+#endif
+
+// WS2812-style LED control on pin A10
+#ifdef WS2812_DRIVER_PWM
+#    ifndef RGB_DI_PIN
+#        define RGB_DI_PIN PAL_LINE(GPIOA, 10)
+#    endif
+#    ifndef WS2812_PWM_DRIVER
+#        define WS2812_PWM_DRIVER PWMD1
+#    endif
+#    ifndef WS2812_PWM_CHANNEL
+#        define WS2812_PWM_CHANNEL 3
+#    endif
+#    ifndef WS2812_PWM_PAL_MODE
+#        define WS2812_PWM_PAL_MODE 1
+#    endif
+#    ifndef WS2812_DMA_STREAM
+#        define WS2812_DMA_STREAM STM32_DMA2_STREAM5
+#    endif
+#    ifndef WS2812_DMA_CHANNEL
+#        define WS2812_DMA_CHANNEL 6
+#    endif
+#endif
+
+#ifndef USB_VBUS_PIN
+#    define USB_VBUS_PIN PAL_LINE(GPIOA, 9)
+#endif
\ No newline at end of file
diff --git a/platforms/chibios/boards/BONSAI_C4/configs/halconf.h b/platforms/chibios/boards/BONSAI_C4/configs/halconf.h
new file mode 100644
index 0000000000..7887e7c9ba
--- /dev/null
+++ b/platforms/chibios/boards/BONSAI_C4/configs/halconf.h
@@ -0,0 +1,49 @@
+/* Copyright 2022 David Hoelscher, 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 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
+
+#ifndef HAL_USE_SPI
+#    define HAL_USE_SPI TRUE
+#endif
+
+#ifndef HAL_USE_I2C
+#    define HAL_USE_I2C TRUE
+#endif
+
+#ifdef SPLIT_KEYBOARD
+#    ifndef HAL_USE_SERIAL
+#        define HAL_USE_SERIAL TRUE
+#    endif
+#    ifndef SERIAL_BUFFERS_SIZE
+#        define SERIAL_BUFFERS_SIZE 256
+#    endif
+#endif
+
+#ifdef WS2812_DRIVER_PWM
+#    ifndef HAL_USE_PWM
+#        define HAL_USE_PWM TRUE
+#    endif
+#endif
+
+#ifndef SPI_SELECT_MODE
+#    define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
+#endif
+
+#ifndef SPI_USE_WAIT
+#    define SPI_USE_WAIT TRUE
+#endif
+
+#include_next <halconf.h>
\ No newline at end of file
diff --git a/platforms/chibios/boards/BONSAI_C4/configs/mcuconf.h b/platforms/chibios/boards/BONSAI_C4/configs/mcuconf.h
new file mode 100644
index 0000000000..2f9e627c7e
--- /dev/null
+++ b/platforms/chibios/boards/BONSAI_C4/configs/mcuconf.h
@@ -0,0 +1,249 @@
+/*
+    ChibiOS - Copyright (C) 2006..2020 Giovanni Di Sirio
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+        http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#ifndef MCUCONF_H
+#define MCUCONF_H
+
+/*
+ * STM32F4xx drivers configuration.
+ * The following settings override the default settings present in
+ * the various device driver implementation headers.
+ * Note that the settings for each driver only have effect if the whole
+ * driver is enabled in halconf.h.
+ *
+ * IRQ priorities:
+ * 15...0       Lowest...Highest.
+ *
+ * DMA priorities:
+ * 0...3        Lowest...Highest.
+ */
+
+#define STM32F4xx_MCUCONF
+#define STM32F411_MCUCONF
+
+/*
+ * HAL driver system settings.
+ */
+#define STM32_NO_INIT                       FALSE
+#define STM32_PVD_ENABLE                    FALSE
+#define STM32_PLS                           STM32_PLS_LEV0
+#define STM32_BKPRAM_ENABLE                 FALSE
+#define STM32_HSI_ENABLED                   TRUE
+#define STM32_LSI_ENABLED                   TRUE
+#define STM32_HSE_ENABLED                   TRUE
+#define STM32_LSE_ENABLED                   FALSE
+#define STM32_CLOCK48_REQUIRED              TRUE
+#define STM32_SW                            STM32_SW_PLL
+#define STM32_PLLSRC                        STM32_PLLSRC_HSE
+#define STM32_PLLM_VALUE                    4
+#define STM32_PLLN_VALUE                    96
+#define STM32_PLLP_VALUE                    2
+#define STM32_PLLQ_VALUE                    4
+#define STM32_HPRE                          STM32_HPRE_DIV1
+#define STM32_PPRE1                         STM32_PPRE1_DIV2
+#define STM32_PPRE2                         STM32_PPRE2_DIV1
+#define STM32_RTCSEL                        STM32_RTCSEL_LSI
+#define STM32_RTCPRE_VALUE                  8
+#define STM32_MCO1SEL                       STM32_MCO1SEL_HSI
+#define STM32_MCO1PRE                       STM32_MCO1PRE_DIV1
+#define STM32_MCO2SEL                       STM32_MCO2SEL_SYSCLK
+#define STM32_MCO2PRE                       STM32_MCO2PRE_DIV5
+#define STM32_I2SSRC                        STM32_I2SSRC_CKIN
+#define STM32_PLLI2SN_VALUE                 192
+#define STM32_PLLI2SR_VALUE                 5
+
+/*
+ * IRQ system settings.
+ */
+#define STM32_IRQ_EXTI0_PRIORITY            6
+#define STM32_IRQ_EXTI1_PRIORITY            6
+#define STM32_IRQ_EXTI2_PRIORITY            6
+#define STM32_IRQ_EXTI3_PRIORITY            6
+#define STM32_IRQ_EXTI4_PRIORITY            6
+#define STM32_IRQ_EXTI5_9_PRIORITY          6
+#define STM32_IRQ_EXTI10_15_PRIORITY        6
+#define STM32_IRQ_EXTI16_PRIORITY           6
+#define STM32_IRQ_EXTI17_PRIORITY           15
+#define STM32_IRQ_EXTI18_PRIORITY           6
+#define STM32_IRQ_EXTI19_PRIORITY           6
+#define STM32_IRQ_EXTI20_PRIORITY           6
+#define STM32_IRQ_EXTI21_PRIORITY           15
+#define STM32_IRQ_EXTI22_PRIORITY           15
+
+#define STM32_IRQ_TIM1_BRK_TIM9_PRIORITY    7
+#define STM32_IRQ_TIM1_UP_TIM10_PRIORITY    7
+#define STM32_IRQ_TIM1_TRGCO_TIM11_PRIORITY 7
+#define STM32_IRQ_TIM1_CC_PRIORITY          7
+#define STM32_IRQ_TIM2_PRIORITY             7
+#define STM32_IRQ_TIM3_PRIORITY             7
+#define STM32_IRQ_TIM4_PRIORITY             7
+#define STM32_IRQ_TIM5_PRIORITY             7
+
+#define STM32_IRQ_USART1_PRIORITY           12
+#define STM32_IRQ_USART2_PRIORITY           12
+#define STM32_IRQ_USART6_PRIORITY           12
+
+/*
+ * ADC driver system settings.
+ */
+#define STM32_ADC_ADCPRE                    ADC_CCR_ADCPRE_DIV4
+#define STM32_ADC_USE_ADC1                  FALSE
+#define STM32_ADC_ADC1_DMA_STREAM           STM32_DMA_STREAM_ID(2, 4)
+#define STM32_ADC_ADC1_DMA_PRIORITY         2
+#define STM32_ADC_IRQ_PRIORITY              6
+#define STM32_ADC_ADC1_DMA_IRQ_PRIORITY     6
+
+/*
+ * GPT driver system settings.
+ */
+#define STM32_GPT_USE_TIM1                  FALSE
+#define STM32_GPT_USE_TIM2                  FALSE
+#define STM32_GPT_USE_TIM3                  FALSE
+#define STM32_GPT_USE_TIM4                  FALSE
+#define STM32_GPT_USE_TIM5                  FALSE
+#define STM32_GPT_USE_TIM9                  FALSE
+#define STM32_GPT_USE_TIM10                 FALSE
+#define STM32_GPT_USE_TIM11                 FALSE
+
+/*
+ * I2C driver system settings.
+ */
+#define STM32_I2C_USE_I2C1                  TRUE
+#define STM32_I2C_USE_I2C2                  FALSE
+#define STM32_I2C_USE_I2C3                  FALSE
+#define STM32_I2C_BUSY_TIMEOUT              50
+#define STM32_I2C_I2C1_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 0)
+#define STM32_I2C_I2C1_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 6)
+#define STM32_I2C_I2C2_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 2)
+#define STM32_I2C_I2C2_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 7)
+#define STM32_I2C_I2C3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 2)
+#define STM32_I2C_I2C3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 4)
+#define STM32_I2C_I2C1_IRQ_PRIORITY         5
+#define STM32_I2C_I2C2_IRQ_PRIORITY         5
+#define STM32_I2C_I2C3_IRQ_PRIORITY         5
+#define STM32_I2C_I2C1_DMA_PRIORITY         3
+#define STM32_I2C_I2C2_DMA_PRIORITY         3
+#define STM32_I2C_I2C3_DMA_PRIORITY         3
+#define STM32_I2C_DMA_ERROR_HOOK(i2cp)      osalSysHalt("DMA failure")
+
+/*
+ * I2S driver system settings.
+ */
+#define STM32_I2S_USE_SPI2                  FALSE
+#define STM32_I2S_USE_SPI3                  FALSE
+#define STM32_I2S_SPI2_IRQ_PRIORITY         10
+#define STM32_I2S_SPI3_IRQ_PRIORITY         10
+#define STM32_I2S_SPI2_DMA_PRIORITY         1
+#define STM32_I2S_SPI3_DMA_PRIORITY         1
+#define STM32_I2S_SPI2_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 3)
+#define STM32_I2S_SPI2_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 4)
+#define STM32_I2S_SPI3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 0)
+#define STM32_I2S_SPI3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 7)
+#define STM32_I2S_DMA_ERROR_HOOK(i2sp)      osalSysHalt("DMA failure")
+
+/*
+ * ICU driver system settings.
+ */
+#define STM32_ICU_USE_TIM1                  FALSE
+#define STM32_ICU_USE_TIM2                  FALSE
+#define STM32_ICU_USE_TIM3                  FALSE
+#define STM32_ICU_USE_TIM4                  FALSE
+#define STM32_ICU_USE_TIM5                  FALSE
+#define STM32_ICU_USE_TIM9                  FALSE
+#define STM32_ICU_USE_TIM10                 FALSE
+#define STM32_ICU_USE_TIM11                 FALSE
+
+/*
+ * PWM driver system settings.
+ */
+#define STM32_PWM_USE_TIM1                  TRUE
+#define STM32_PWM_USE_TIM2                  FALSE
+#define STM32_PWM_USE_TIM3                  TRUE
+#define STM32_PWM_USE_TIM4                  FALSE
+#define STM32_PWM_USE_TIM5                  FALSE
+#define STM32_PWM_USE_TIM9                  FALSE
+#define STM32_PWM_USE_TIM10                 FALSE
+#define STM32_PWM_USE_TIM11                 FALSE
+
+/*
+ * RTC driver system settings.
+ */
+#define STM32_RTC_PRESA_VALUE               32
+#define STM32_RTC_PRESS_VALUE               1024
+#define STM32_RTC_CR_INIT                   0
+#define STM32_RTC_TAMPCR_INIT               0
+
+/*
+ * SERIAL driver system settings.
+ */
+#define STM32_SERIAL_USE_USART1             TRUE
+#define STM32_SERIAL_USE_USART2             FALSE
+#define STM32_SERIAL_USE_USART6             FALSE
+
+/*
+ * SPI driver system settings.
+ */
+#define STM32_SPI_USE_SPI1                  TRUE
+#define STM32_SPI_USE_SPI2                  FALSE
+#define STM32_SPI_USE_SPI3                  FALSE
+#define STM32_SPI_SPI1_RX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 0)
+#define STM32_SPI_SPI1_TX_DMA_STREAM        STM32_DMA_STREAM_ID(2, 3)
+#define STM32_SPI_SPI2_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 3)
+#define STM32_SPI_SPI2_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 4)
+#define STM32_SPI_SPI3_RX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 0)
+#define STM32_SPI_SPI3_TX_DMA_STREAM        STM32_DMA_STREAM_ID(1, 7)
+#define STM32_SPI_SPI1_DMA_PRIORITY         1
+#define STM32_SPI_SPI2_DMA_PRIORITY         1
+#define STM32_SPI_SPI3_DMA_PRIORITY         1
+#define STM32_SPI_SPI1_IRQ_PRIORITY         10
+#define STM32_SPI_SPI2_IRQ_PRIORITY         10
+#define STM32_SPI_SPI3_IRQ_PRIORITY         10
+#define STM32_SPI_DMA_ERROR_HOOK(spip)      osalSysHalt("DMA failure")
+
+/*
+ * ST driver system settings.
+ */
+#define STM32_ST_IRQ_PRIORITY               8
+#define STM32_ST_USE_TIMER                  2
+
+/*
+ * UART driver system settings.
+ */
+#define STM32_UART_USE_USART1               FALSE
+#define STM32_UART_USE_USART2               FALSE
+#define STM32_UART_USE_USART6               FALSE
+#define STM32_UART_USART1_RX_DMA_STREAM     STM32_DMA_STREAM_ID(2, 5)
+#define STM32_UART_USART1_TX_DMA_STREAM     STM32_DMA_STREAM_ID(2, 7)
+#define STM32_UART_USART2_RX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 5)
+#define STM32_UART_USART2_TX_DMA_STREAM     STM32_DMA_STREAM_ID(1, 6)
+#define STM32_UART_USART6_RX_DMA_STREAM     STM32_DMA_STREAM_ID(2, 2)
+#define STM32_UART_USART6_TX_DMA_STREAM     STM32_DMA_STREAM_ID(2, 7)
+#define STM32_UART_USART1_DMA_PRIORITY      0
+#define STM32_UART_USART2_DMA_PRIORITY      0
+#define STM32_UART_USART6_DMA_PRIORITY      0
+#define STM32_UART_DMA_ERROR_HOOK(uartp)    osalSysHalt("DMA failure")
+
+/*
+ * USB driver system settings.
+ */
+#define STM32_USB_USE_OTG1                  TRUE
+#define STM32_USB_OTG1_IRQ_PRIORITY         14
+#define STM32_USB_OTG1_RX_FIFO_SIZE         512
+#define STM32_USB_HOST_WAKEUP_DURATION      2
+
+/*
+ * WDG driver system settings.
+ */
+#define STM32_WDG_USE_IWDG                  FALSE
+
+#endif /* MCUCONF_H */
\ No newline at end of file
diff --git a/platforms/chibios/converters/promicro_to_bonsai_c4/converter.mk b/platforms/chibios/converters/promicro_to_bonsai_c4/converter.mk
index 7410209b67..005b7a8160 100644
--- a/platforms/chibios/converters/promicro_to_bonsai_c4/converter.mk
+++ b/platforms/chibios/converters/promicro_to_bonsai_c4/converter.mk
@@ -1,4 +1,4 @@
 # Proton C MCU settings for converting AVR projects
 MCU := STM32F411
-BOARD := GENERIC_STM32_F411XE
-BOOTLOADER := stm32-dfu
\ No newline at end of file
+BOARD := BONSAI_C4
+BOOTLOADER := stm32-dfu
diff --git a/platforms/chibios/converters/promicro_to_bonsai_c4/post_converter.mk b/platforms/chibios/converters/promicro_to_bonsai_c4/post_converter.mk
new file mode 100644
index 0000000000..5f49b17f8a
--- /dev/null
+++ b/platforms/chibios/converters/promicro_to_bonsai_c4/post_converter.mk
@@ -0,0 +1,5 @@
+BACKLIGHT_DRIVER ?= pwm
+WS2812_DRIVER ?= pwm
+SERIAL_DRIVER ?= usart
+FLASH_DRIVER ?= spi
+EEPROM_DRIVER ?= spi
\ No newline at end of file