Bastard Keyboards: upstream recent changes (#18903)

* bastardkb: cleanup blackpill configuration

Fixes #17

* bastardkb: fix splinky configuration

The pinout of the splinky changed between the last beta batch, and the
production one. This commit updates the keyboard definition to support
the new pinout by default, while offering backward compatibility.

Define `SPLINKY_BETA_PINOUT` to build the firmware with pre-production
pinout.

Fixes #15

* bastardkb: add support for STeMCell

* Update scylla/tbkmini/skeletyl outdated readmes

* bastardkb/dilemma: enable circular scroll

* bastardkb/dilemma: add initial version of the `via` keymap

* bastardkb/dilemma/assembled: add new keyboard

Fixes #20

* bastardkb/dilemma: remove elite-c

* Initial support for the Dilemma 3x5+3 Assembled RGB

* Address code review comments

* Address more comments

* Address review comments

* Address more nits

* bastardkb: split splinky-based keyboards to distinguish between Splinky v2 and v3 pinout

19 files changed, 298 insertions, 30 deletions

diff --git a/keyboards/bastardkb/charybdis/3x5/blackpill/config.h b/keyboards/bastardkb/charybdis/3x5/blackpill/config.h
index ddd5e83318..ef99f3b631 100644
--- a/keyboards/bastardkb/charybdis/3x5/blackpill/config.h
+++ b/keyboards/bastardkb/charybdis/3x5/blackpill/config.h
@@ -58,5 +58,5 @@
 #define EXTERNAL_EEPROM_SPI_SLAVE_SELECT_PIN A4
 
 /* PMW3360 settings. */
-#define PMW33XX_CS_PIN B14
+#define POINTING_DEVICE_CS_PIN B14
 #define PMW33XX_CS_DIVISOR 64
diff --git a/keyboards/bastardkb/charybdis/3x5/blackpill/halconf.h b/keyboards/bastardkb/charybdis/3x5/blackpill/halconf.h
index a89dff0cd3..0e5caa9f9a 100644
--- a/keyboards/bastardkb/charybdis/3x5/blackpill/halconf.h
+++ b/keyboards/bastardkb/charybdis/3x5/blackpill/halconf.h
@@ -1,4 +1,4 @@
-/*
+/**
  * Copyright 2020 Nick Brassel (tzarc)
  * Copyright 2021 Charly Delay <charly@codesink.dev> (@0xcharly)
  *
@@ -20,10 +20,8 @@
 
 #define HAL_USE_PWM TRUE
 #define HAL_USE_SERIAL TRUE
-//#define HAL_USE_I2C TRUE
 #define HAL_USE_SPI TRUE
 #define SPI_USE_WAIT TRUE
 #define SPI_SELECT_MODE SPI_SELECT_MODE_PAD
-//#define HAL_USE_GPT TRUE
 
 #include_next "halconf.h"
diff --git a/keyboards/bastardkb/charybdis/3x5/blackpill/mcuconf.h b/keyboards/bastardkb/charybdis/3x5/blackpill/mcuconf.h
index 1615d1bf46..3b9c9056f8 100644
--- a/keyboards/bastardkb/charybdis/3x5/blackpill/mcuconf.h
+++ b/keyboards/bastardkb/charybdis/3x5/blackpill/mcuconf.h
@@ -21,14 +21,6 @@
 
 #include_next "mcuconf.h"
 
-#undef STM32_I2C_USE_I2C1
-#define STM32_I2C_USE_I2C1 TRUE
-
-#undef STM32_I2C_I2C1_RX_DMA_STREAM
-#define STM32_I2C_I2C1_RX_DMA_STREAM STM32_DMA_STREAM_ID(1, 0)
-#undef STM32_I2C_I2C1_TX_DMA_STREAM
-#define STM32_I2C_I2C1_TX_DMA_STREAM STM32_DMA_STREAM_ID(1, 1)
-
 #undef STM32_PWM_USE_TIM2
 #define STM32_PWM_USE_TIM2 TRUE
 
@@ -46,14 +38,6 @@
 #undef STM32_SERIAL_USE_USART1
 #define STM32_SERIAL_USE_USART1 TRUE
 
-// #undef STM32_SERIAL_USE_USART2
-// #define STM32_SERIAL_USE_USART2 TRUE
-
-// #undef STM32_UART_USART2_RX_DMA_STREAM
-// #define STM32_UART_USART2_RX_DMA_STREAM STM32_DMA_STREAM_ID(1, 5)
-// #undef STM32_UART_USART2_TX_DMA_STREAM
-// #define STM32_UART_USART2_TX_DMA_STREAM STM32_DMA_STREAM_ID(1, 6)
-
 #undef STM32_GPT_USE_TIM4
 #define STM32_GPT_USE_TIM4 TRUE
 
diff --git a/keyboards/bastardkb/charybdis/3x5/blackpill/rules.mk b/keyboards/bastardkb/charybdis/3x5/blackpill/rules.mk
index 0f732c2cbd..a21fd9e7ff 100644
--- a/keyboards/bastardkb/charybdis/3x5/blackpill/rules.mk
+++ b/keyboards/bastardkb/charybdis/3x5/blackpill/rules.mk
@@ -24,10 +24,8 @@ RGBLIGHT_SUPPORTED = yes    # RGB underglow is supported, but not enabled by def
 RGB_MATRIX_ENABLE = yes     # Enable keyboard RGB matrix functionality
 RGB_MATRIX_DRIVER = WS2812
 
-# Charybdis nano is a split 3x5 keyboard with a maximum of 3 thumb keys (2 on
-# the trackball side).
 SPLIT_KEYBOARD = yes
-LAYOUTS = split_3x5_3 # Support community layout, in particular Manna-Harbour's Miryoku layout
+LAYOUTS = split_3x5_3
 
 POINTING_DEVICE_ENABLE = yes # Enable trackball
 POINTING_DEVICE_DRIVER = pmw3360
diff --git a/keyboards/bastardkb/charybdis/3x5/keymaps/bstiq/README.md b/keyboards/bastardkb/charybdis/3x5/keymaps/bstiq/readme.md
index 5d9f7fcd5f..5d9f7fcd5f 100644
--- a/keyboards/bastardkb/charybdis/3x5/keymaps/bstiq/README.md
+++ b/keyboards/bastardkb/charybdis/3x5/keymaps/bstiq/readme.md
diff --git a/keyboards/bastardkb/charybdis/3x5/keymaps/default/keymap.c b/keyboards/bastardkb/charybdis/3x5/keymaps/default/keymap.c
index 148f026740..aa7f1bb329 100644
--- a/keyboards/bastardkb/charybdis/3x5/keymaps/default/keymap.c
+++ b/keyboards/bastardkb/charybdis/3x5/keymaps/default/keymap.c
@@ -14,6 +14,7 @@
  * 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 QMK_KEYBOARD_H
 
 enum charybdis_keymap_layers {
diff --git a/keyboards/bastardkb/charybdis/3x5/v1/elitec/config.h b/keyboards/bastardkb/charybdis/3x5/v1/elitec/config.h
index 3e3d95174c..8a9d40ac63 100644
--- a/keyboards/bastardkb/charybdis/3x5/v1/elitec/config.h
+++ b/keyboards/bastardkb/charybdis/3x5/v1/elitec/config.h
@@ -39,4 +39,4 @@
 #define RGB_DI_PIN D3
 
 /* PMW3360 settings. */
-#define PMW33XX_CS_PIN B0
+#define POINTING_DEVICE_CS_PIN B0
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/elitec/config.h b/keyboards/bastardkb/charybdis/3x5/v2/elitec/config.h
index 5c11fa3145..2667ee9e7e 100644
--- a/keyboards/bastardkb/charybdis/3x5/v2/elitec/config.h
+++ b/keyboards/bastardkb/charybdis/3x5/v2/elitec/config.h
@@ -33,4 +33,4 @@
 #define RGB_DI_PIN D3
 
 /* PMW3360 settings. */
-#define PMW33XX_CS_PIN F0
+#define POINTING_DEVICE_CS_PIN F0
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/splinky/config.h b/keyboards/bastardkb/charybdis/3x5/v2/splinky/config.h
index 2929d3dd1e..d4688aef92 100644
--- a/keyboards/bastardkb/charybdis/3x5/v2/splinky/config.h
+++ b/keyboards/bastardkb/charybdis/3x5/v2/splinky/config.h
@@ -20,8 +20,6 @@
 /* Key matrix configuration. */
 #define MATRIX_ROW_PINS \
     { GP26, GP5, GP4, GP9 }
-#define MATRIX_COL_PINS \
-    { GP28, GP15, GP6, GP7, GP8 }
 
 /* Handedness. */
 #define MASTER_RIGHT
@@ -39,12 +37,74 @@
 
 /* SPI & PMW3360 settings. */
 #define SPI_DRIVER SPID0
-#define SPI_SCK_PIN GP18
-#define SPI_MOSI_PIN GP19
 #define SPI_MISO_PIN GP20
-#define PMW33XX_CS_PIN GP14
 
 /* Reset. */
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED GP17
 #define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 1000U
+
+/** RGB Matrix. */
+
+#ifdef RGB_MATRIX_ENABLE
+// Enable all animations on ARM boards since they have plenty of memory
+// available for it.
+#    define ENABLE_RGB_MATRIX_ALPHAS_MODS
+#    define ENABLE_RGB_MATRIX_GRADIENT_UP_DOWN
+#    define ENABLE_RGB_MATRIX_GRADIENT_LEFT_RIGHT
+#    define ENABLE_RGB_MATRIX_BREATHING
+#    define ENABLE_RGB_MATRIX_BAND_SAT
+#    define ENABLE_RGB_MATRIX_BAND_VAL
+#    define ENABLE_RGB_MATRIX_BAND_PINWHEEL_SAT
+#    define ENABLE_RGB_MATRIX_BAND_PINWHEEL_VAL
+#    define ENABLE_RGB_MATRIX_BAND_SPIRAL_SAT
+#    define ENABLE_RGB_MATRIX_BAND_SPIRAL_VAL
+#    define ENABLE_RGB_MATRIX_CYCLE_ALL
+#    define ENABLE_RGB_MATRIX_CYCLE_LEFT_RIGHT
+#    define ENABLE_RGB_MATRIX_CYCLE_UP_DOWN
+#    define ENABLE_RGB_MATRIX_RAINBOW_MOVING_CHEVRON
+#    define ENABLE_RGB_MATRIX_CYCLE_OUT_IN
+#    define ENABLE_RGB_MATRIX_CYCLE_OUT_IN_DUAL
+#    define ENABLE_RGB_MATRIX_CYCLE_PINWHEEL
+#    define ENABLE_RGB_MATRIX_CYCLE_SPIRAL
+#    define ENABLE_RGB_MATRIX_DUAL_BEACON
+#    define ENABLE_RGB_MATRIX_RAINBOW_BEACON
+#    define ENABLE_RGB_MATRIX_RAINBOW_PINWHEELS
+#    define ENABLE_RGB_MATRIX_RAINDROPS
+#    define ENABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+#    define ENABLE_RGB_MATRIX_HUE_BREATHING
+#    define ENABLE_RGB_MATRIX_HUE_PENDULUM
+#    define ENABLE_RGB_MATRIX_HUE_WAVE
+#    define ENABLE_RGB_MATRIX_TYPING_HEATMAP
+#    define ENABLE_RGB_MATRIX_DIGITAL_RAIN
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_WIDE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTIWIDE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_CROSS
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTICROSS
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_NEXUS
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTINEXUS
+#    define ENABLE_RGB_MATRIX_SPLASH
+#    define ENABLE_RGB_MATRIX_MULTISPLASH
+#    define ENABLE_RGB_MATRIX_SOLID_SPLASH
+#    define ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
+
+// Limit maximum brightness to keep power consumption reasonable, and avoid
+// disconnects.
+#    undef RGB_MATRIX_MAXIMUM_BRIGHTNESS
+#    define RGB_MATRIX_MAXIMUM_BRIGHTNESS 64
+
+// Rainbow swirl as startup mode.
+#    define ENABLE_RGB_MATRIX_CYCLE_LEFT_RIGHT
+#    define RGB_MATRIX_STARTUP_MODE RGB_MATRIX_CYCLE_LEFT_RIGHT
+
+// Slow swirl at startup.
+#    define RGB_MATRIX_STARTUP_SPD 32
+
+// Startup values.
+#    define RGB_MATRIX_STARTUP_HUE 0
+#    define RGB_MATRIX_STARTUP_SAT 255
+#    define RGB_MATRIX_STARTUP_VAL RGB_MATRIX_MAXIMUM_BRIGHTNESS
+#    define RGB_MATRIX_STARTUP_HSV RGB_MATRIX_STARTUP_HUE, RGB_MATRIX_STARTUP_SAT, RGB_MATRIX_STARTUP_VAL
+#endif // RGB_MATRIX_ENABLE
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/splinky/readme.md b/keyboards/bastardkb/charybdis/3x5/v2/splinky/readme.md
new file mode 100644
index 0000000000..22df77bbaa
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/splinky/readme.md
@@ -0,0 +1,6 @@
+# Splinky controller
+
+The splinky is a Pro-Micro/Elite-C replacement with USB-C and RP2040.
+
+See https://github.com/plut0nium/0xB2/#releases to figure out the right version
+for you (v2 and v3) supported.
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/splinky/v2/config.h b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v2/config.h
new file mode 100644
index 0000000000..70b65a97c7
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v2/config.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2022 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * 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
+
+/* Key matrix configuration. */
+#define MATRIX_COL_PINS \
+    { GP28, GP15, GP6, GP7, GP8 }
+
+/* SPI & PMW3360 settings. */
+#define SPI_SCK_PIN GP18
+#define SPI_MOSI_PIN GP19
+#define POINTING_DEVICE_CS_PIN GP14
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/splinky/v2/rules.mk b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v2/rules.mk
new file mode 100644
index 0000000000..c9c50319db
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v2/rules.mk
@@ -0,0 +1,2 @@
+# Intentionally blank so that QMK detects this folder as a valid keyboard
+# parameter.
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/splinky/v3/config.h b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v3/config.h
new file mode 100644
index 0000000000..d53c5a3c41
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v3/config.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2022 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * 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
+
+/* Key matrix configuration. */
+#define MATRIX_COL_PINS \
+    { GP28, GP21, GP6, GP7, GP8 }
+
+/* SPI & PMW3360 settings. */
+#define SPI_SCK_PIN GP22
+#define SPI_MOSI_PIN GP23
+#define POINTING_DEVICE_CS_PIN GP16
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/splinky/v3/rules.mk b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v3/rules.mk
new file mode 100644
index 0000000000..c9c50319db
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/splinky/v3/rules.mk
@@ -0,0 +1,2 @@
+# Intentionally blank so that QMK detects this folder as a valid keyboard
+# parameter.
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/stemcell/config.h b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/config.h
new file mode 100644
index 0000000000..a06859b215
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/config.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2022 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * 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
+
+/* Key matrix configuration. */
+#define MATRIX_ROW_PINS \
+    { F7, C6, D4, B5 }
+#define MATRIX_COL_PINS \
+    { F5, B6, D7, E6, B4 }
+
+/* Handedness. */
+#define MASTER_RIGHT
+
+// To use the handedness pin, resistors need to be installed on the adapter PCB.
+// If so, uncomment the following code, and undefine MASTER_RIGHT above.
+// #define A0 PAL_LINE(GPIOA, 0)
+// #define SPLIT_HAND_PIN A0
+// #define SPLIT_HAND_PIN_LOW_IS_LEFT  // High -> right, Low -> left.
+
+/* serial.c configuration (for split keyboard). */
+#define SOFT_SERIAL_PIN D2
+
+/* RGB settings. */
+#define RGB_DI_PIN D3
+#define WS2812_PWM_DRIVER PWMD2
+#define WS2812_PWM_CHANNEL 4
+#define WS2812_PWM_PAL_MODE 1
+#define WS2812_DMA_STREAM STM32_DMA1_STREAM7
+#define WS2812_DMA_CHANNEL 3
+
+/* CRC. */
+#define CRC8_USE_TABLE
+#define CRC8_OPTIMIZE_SPEED
+
+/* SPI config for pmw3360 sensor. */
+#define SPI_DRIVER SPID1
+#define SPI_SCK_PIN B1
+#define SPI_SCK_PAL_MODE 5
+#define SPI_MOSI_PIN B2
+#define SPI_MOSI_PAL_MODE 5
+#define SPI_MISO_PIN B3
+#define SPI_MISO_PAL_MODE 5
+
+/* PMW3360 settings. */
+#define A1 PAL_LINE(GPIOA, 1)
+#define POINTING_DEVICE_CS_PIN A1
+#define PMW3360_CS_MODE 3
+#define PMW3360_CS_DIVISOR 64
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/stemcell/halconf.h b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/halconf.h
new file mode 100644
index 0000000000..0397de50b7
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/halconf.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2021 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * 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
+
+#define HAL_USE_PWM TRUE
+#define HAL_USE_SERIAL TRUE
+#define HAL_USE_SPI TRUE
+
+#include_next <halconf.h>
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/stemcell/info.json b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/info.json
new file mode 100644
index 0000000000..2aee1fe40b
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/info.json
@@ -0,0 +1,6 @@
+{
+    "keyboard_name": "Charybdis Nano (3x5) STeMCell",
+    "usb": {
+      "device_version": "2.0.0"
+    }
+}
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/stemcell/mcuconf.h b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/mcuconf.h
new file mode 100644
index 0000000000..17a46d8f95
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/mcuconf.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2021 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * 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>
+
+#undef STM32_SPI_USE_SPI1
+#define STM32_SPI_USE_SPI1 TRUE
+
+#undef STM32_SERIAL_USE_USART1
+#define STM32_SERIAL_USE_USART1 FALSE
+
+#undef STM32_PWM_USE_TIM2
+#define STM32_PWM_USE_TIM2 TRUE
+
+#undef STM32_ST_USE_TIMER
+#define STM32_ST_USE_TIMER 5
diff --git a/keyboards/bastardkb/charybdis/3x5/v2/stemcell/rules.mk b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/rules.mk
new file mode 100644
index 0000000000..e4a9ce289c
--- /dev/null
+++ b/keyboards/bastardkb/charybdis/3x5/v2/stemcell/rules.mk
@@ -0,0 +1,38 @@
+# MCU name
+MCU = STM32F411
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+CONVERT_TO = stemcell
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+AUDIO_SUPPORTED = no        # Audio is not supported
+RGB_MATRIX_SUPPORTED = yes  # RGB matrix is supported and enabled by default
+RGBLIGHT_SUPPORTED = yes    # RGB underglow is supported, but not enabled by default
+RGB_MATRIX_ENABLE = yes     # Enable keyboard RGB matrix functionality
+RGB_MATRIX_DRIVER = WS2812
+
+SPLIT_KEYBOARD = yes
+LAYOUTS = split_3x5_3
+
+POINTING_DEVICE_ENABLE = yes # Enable trackball
+POINTING_DEVICE_DRIVER = pmw3360
+MOUSE_SHARED_EP = no # Unify multiple HID interfaces into a single Endpoint
+KEYBOARD_SHARED_EP = yes
+
+SERIAL_DRIVER = usart
+WS2812_DRIVER = pwm
+
+DEBOUNCE_TYPE = asym_eager_defer_pk