slicemk: serial split: setup Raytac MDBT50-DB-33 for development

app/boards/arm/raytac_mdbt50q_rx_green/Kconfig.defconfig

@@ -16,4 +16,9 @@ endif # USB
 config BT_CTLR
 	default BT
 
+# Use maximum Bluetooth transmit power.
+choice BT_CTLR_TX_PWR
+	default BT_CTLR_TX_PWR_PLUS_8
+endchoice
+
 endif # BOARD_RAYTAC_MDBT50Q_RX_GREEN

app/boards/arm/raytac_mdbt50q_rx_green/raytac_mdbt50q_rx_green_defconfig

@@ -21,16 +21,15 @@ CONFIG_GPIO=y
 # Use NVS for settings.
 CONFIG_MPU_ALLOW_FLASH_WRITE=y
 CONFIG_NVS=y
+CONFIG_SETTINGS=y
 CONFIG_SETTINGS_NVS=y
 CONFIG_FLASH=y
 CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_FLASH_MAP=y
 
+# TODO TODO TODO serial shouldn't be enabled in main production build
+CONFIG_SERIAL=y
+CONFIG_PINCTRL=y
+
 # The Adafruit bootloader allocates 7 pages for user data on nRF52833.
 CONFIG_SETTINGS_NVS_SECTOR_COUNT=7
-
-# Use maximum Bluetooth transmit power.
-CONFIG_BT_CTLR_TX_PWR_PLUS_8=y
-
-# Include support for Coded PHY.
-CONFIG_BT_CTLR_PHY_CODED=y

app/boards/shields/slicemk_ergodox/Kconfig.defconfig

@@ -42,3 +42,19 @@ config ZMK_SPLIT_BLE_PREF_TIMEOUT
 	default 900
 
 endif
+
+if SHIELD_SLICEMK_ERGODOX_UART
+
+config ZMK_USB
+	default y
+
+config ZMK_SPLIT
+	default y
+
+config ZMK_SPLIT_ROLE_CENTRAL
+	default y
+
+config ZMK_KEYBOARD_NAME
+	default "SliceMK ErgoDox"
+
+endif

app/boards/shields/slicemk_ergodox/Kconfig.shield

@@ -12,3 +12,7 @@ config SHIELD_SLICEMK_ERGODOX_LEFTSINGLE
 
 config SHIELD_SLICEMK_ERGODOX_RIGHTSINGLE
 	def_bool $(shields_list_contains,slicemk_ergodox_rightsingle)
+
+# TODO TODO TODO think about naming "uart" vs "converter"
+config SHIELD_SLICEMK_ERGODOX_UART
+	def_bool $(shields_list_contains,slicemk_ergodox_uart)

app/boards/shields/slicemk_ergodox/slicemk_ergodox_uart.overlay

@@ -0,0 +1,80 @@
+#include <dt-bindings/led/led.h>
+
+#include <dt-bindings/zmk/matrix_transform.h>
+
+/ {
+	chosen {
+		zmk,kscan = &kscan0;
+		zmk,matrix_transform = &default_transform;
+
+		zmk,split-serial = &uart0;
+		zmk,underglow = &led_strip;
+	};
+
+	// TODO TODO TODO placeholder button, currently just an unused pin. probably
+	// abstract to &button or something as the actual pin would differ from
+	// board to board. maybe p0.15 since that's used on raytac dongle
+	kscan0: kscan {
+		compatible = "zmk,kscan-gpio-direct";
+		label = "KSCAN";
+		input-gpios = <&gpio0 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+	};
+
+	default_transform: keymap_transform_0 {
+		compatible = "zmk,matrix-transform";
+		columns = <15>;
+		rows = <7>;
+		map = <
+                                                     RC(0,0)
+RC(0,1) RC(0,2) RC(0,3) RC(0,4) RC(0,5) RC(0,6) RC(0,7)   RC(0,8)  RC(0,9) RC(0,10) RC(0,11) RC(0,12) RC(0,13) RC(0,14)
+RC(1,1) RC(1,2) RC(1,3) RC(1,4) RC(1,5) RC(1,6) RC(1,7)   RC(1,8)  RC(1,9) RC(1,10) RC(1,11) RC(1,12) RC(1,13) RC(1,14)
+RC(2,1) RC(2,2) RC(2,3) RC(2,4) RC(2,5) RC(2,6)                    RC(2,9) RC(2,10) RC(2,11) RC(2,12) RC(2,13) RC(2,14)
+RC(3,1) RC(3,2) RC(3,3) RC(3,4) RC(3,5) RC(3,6) RC(3,7)   RC(3,8)  RC(3,9) RC(3,10) RC(3,11) RC(3,12) RC(3,13) RC(3,14)
+RC(4,1) RC(4,2) RC(4,3) RC(4,4) RC(4,5)                                    RC(4,10) RC(4,11) RC(4,12) RC(4,13) RC(4,14)
+                                        RC(5,7) RC(5,6)   RC(5,9)  RC(5,8)
+                                RC(5,5) RC(5,4) RC(5,3)   RC(5,12) RC(5,11) RC(5,10)
+                                                RC(5,2)   RC(5,13)
+		>;
+	};
+};
+
+&pinctrl {
+	uart0_default: uart0_default {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 1, 9)>;
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_RX, 0, 11)>;
+			bias-pull-up;
+		};
+	};
+
+	spi3_default: spi3_default {
+		group1 {
+			psels = <NRF_PSEL(SPIM_MOSI, 0, 5)>;
+		};
+	};
+};
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&uart0_default>;
+	pinctrl-names = "default";
+};
+
+// Define LED strip.
+&spi3 {
+	status = "okay";
+	pinctrl-0 = <&spi3_default>;
+	pinctrl-names = "default";
+	led_strip: ws2812@0 {
+		compatible = "worldsemi,ws2812-spi";
+		reg = <0>;
+		spi-max-frequency = <4000000>;
+		chain-length = <256>;
+		color-mapping = <LED_COLOR_ID_GREEN LED_COLOR_ID_RED LED_COLOR_ID_BLUE>;
+		spi-one-frame = <0x70>;
+		spi-zero-frame = <0x40>;
+	};
+};

app/prj.conf

@@ -3,6 +3,6 @@ CONFIG_ZMK_BEHAVIORS_QUEUE_SIZE=512
 # Increase stacks to reduce possibility of an overflow.
 CONFIG_MAIN_STACK_SIZE=2048
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
-CONFIG_ZMK_BLE_THREAD_STACK_SIZE=2048
-CONFIG_ZMK_SPLIT_BLE_CENTRAL_SPLIT_RUN_STACK_SIZE=2048
+# CONFIG_ZMK_BLE_THREAD_STACK_SIZE=2048
+# CONFIG_ZMK_SPLIT_BLE_CENTRAL_SPLIT_RUN_STACK_SIZE=2048
 CONFIG_ISR_STACK_SIZE=2048