First attempts at getting the mdk dongle working with zmk

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/CMakeLists.txt

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+#
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+#
+
+target_sources(app PRIVATE mdk_dongle_power_led.c)
+
+set_property(GLOBAL APPEND PROPERTY extra_post_build_commands
+  COMMAND ${PYTHON_EXECUTABLE} ${ZEPHYR_BASE}/../tools/uf2/utils/uf2conv.py
+  -c 
+  -b 0x26000
+  -f 0xADA52840
+  -o ${PROJECT_BINARY_DIR}/${CONFIG_KERNEL_BIN_NAME}.uf2
+  ${PROJECT_BINARY_DIR}/${CONFIG_KERNEL_BIN_NAME}.bin
+)

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/Kconfig

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+#
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+#
+
+config BOARD_ENABLE_DCDC
+	bool "Enable DCDC mode"
+	select SOC_DCDC_NRF52X
+	default y
+	depends on BOARD_NRF52840_MDK_DONGLE

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/Kconfig.board

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+#
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+#
+
+config BOARD_NRF52840_MDK_DONGLE
+	bool "NRF52840-MDK-dongle"
+	depends on SOC_NRF52840_QIAA

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/Kconfig.defconfig

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+#
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+#
+
+if BOARD_NRF52840_MDK_DONGLE
+
+config BOARD
+	default "nrf52840_mdk_DONGLE"
+
+if USB
+
+config USB_NRFX
+	default y
+
+config USB_DEVICE_STACK
+	default y
+
+endif # USB
+
+config BT_CTLR
+	default BT
+
+config ZMK_BLE
+	default y
+
+config ZMK_USB
+	default y
+
+endif # BOARD_NRF52840_MDK_DONGLE

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/board.cmake

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+#
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+#
+
+board_runner_args(nrfjprog "--nrf-family=NRF52" "--softreset")
+include(${ZEPHYR_BASE}/boards/common/blackmagicprobe.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/nrfjprog.board.cmake)

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/mdk_dongle_power_led.c

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <zephyr.h>
+#include <device.h>
+#include <devicetree.h>
+#include <drivers/gpio.h>
+
+#define POWER_LED_NODE DT_ALIAS(led1_red)
+
+#if DT_NODE_HAS_STATUS(POWER_LED_NODE, okay)
+#define POWER_LED DT_GPIO_LABEL(POWER_LED_NODE, gpios)
+#define PIN DT_GPIO_PIN(POWER_LED_NODE, gpios)
+#define FLAGS DT_GPIO_FLAGS(POWER_LED_NODE, gpios)
+#else
+#error "Unsupported board: power led devicetree alias is not defined"
+#define POWER_LED ""
+#define PIN 0
+#define FLAGS 0
+#endif
+
+static int pwr_led_init(const struct device *dev) {
+	dev = device_get_binding(POWER_LED);
+	if (dev == NULL) {
+		return -EIO;
+	}
+
+	int ret = gpio_pin_configure(dev, PIN, GPIO_OUTPUT_ACTIVE | FLAGS);
+	if (ret < 0) {
+		return -EIO;
+	}
+
+	return gpio_pin_set(dev, PIN, true);
+}
+
+SYS_INIT(pwr_led_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/nrf52840_mdk_dongle.dts

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ * SPDX-License-Identifier: MIT
+ */
+
+/dts-v1/;
+#include <nordic/nrf52840_qiaa.dtsi>
+
+/ {
+	model = "nRF52840-MDK Dongle Dev Kit";
+	compatible = "nordic,pca10056-dk";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_partition;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led0_green: led_0 {
+			gpios = <&gpio0 22 GPIO_ACTIVE_LOW>;
+			label = "Green LED 0";
+		};
+		led1_red: led_1 {
+			gpios = <&gpio0 23 GPIO_ACTIVE_LOW>;
+			label = "Red LED 1";
+		};
+		led2_blue: led_2 {
+			gpios = <&gpio0 24 GPIO_ACTIVE_LOW>;
+			label = "Blue LED 2";
+		};
+	};
+
+	pwmleds {
+		compatible = "pwm-leds";
+		pwm_led0_green: pwm_led_0 {
+			pwms = <&pwm0 22>;
+			label = "Green PWM LED 0";
+		};
+		pwm_led1_red: pwm_led_1 {
+			pwms = <&pwm0 23>;
+			label = "Red PWM LED 1";
+		};
+		pwm_led2_blue: pwm_led_2 {
+			pwms = <&pwm0 24>;
+			label = "Blue PWM LED 2";
+		};
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		button0: button_0 {
+			gpios = <&gpio0 18 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 0";
+		};
+	};
+
+	/* These aliases are provided for compatibility with samples */
+	aliases {
+		sw0 = &button0;
+		led0 = &led0_green;
+		led1 = &led1_red;
+		led2 = &led2_blue;
+		led0-green = &led0_green;
+		led1-red   = &led1_red;
+		led1-blue  = &led2_blue;
+		pwm-led0 = &pwm_led0_green;
+		pwm-led1 = &pwm_led1_red;
+		pwm-led2 = &pwm_led2_blue;
+		green-pwm-led = &pwm_led0_green;
+		red-pwm-led = &pwm_led1_red;
+		blue-pwm-led = &pwm_led2_blue;
+	};
+};
+
+&adc {
+	status = "okay";
+};
+
+&gpiote {
+	status = "okay";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&uart0 {
+	compatible = "nordic,nrf-uart";
+	current-speed = <115200>;
+	status = "okay";
+	tx-pin = <20>;
+	rx-pin = <19>;
+	rts-pin = <5>;
+	cts-pin = <7>;
+};
+
+&i2c0 {
+	compatible = "nordic,nrf-twi";
+	status = "okay";
+	sda-pin = <26>;
+	scl-pin = <27>;
+};
+
+&i2c1 {
+	compatible = "nordic,nrf-twi";
+	status = "okay";
+	sda-pin = <30>;
+	scl-pin = <31>;
+};
+
+&pwm0 {
+	status = "okay";
+	ch0-pin = <22>;
+	ch0-inverted;
+	ch1-pin = <23>;
+	ch1-inverted;
+	ch2-pin = <24>;
+	ch2-inverted;
+};
+
+&flash0 {
+	/*
+	 * For more information, see:
+	 * https://docs.zephyrproject.org/latest/guides/dts/legacy-macros.html#legacy-flash-partitions
+	 */
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x000000000 0x0000C000>;
+		};
+		slot0_partition: partition@c000 {
+			label = "image-0";
+			reg = <0x0000C000 0x00067000>;
+		};
+		slot1_partition: partition@73000 {
+			label = "image-1";
+			reg = <0x00073000 0x00067000>;
+		};
+		scratch_partition: partition@da000 {
+			label = "image-scratch";
+			reg = <0x000da000 0x0001e000>;
+		};
+
+		/*
+		 * The flash starting at 0x000f8000 and ending at
+		 * 0x000fffff is reserved for use by the application.
+		 */
+
+		/*
+		 * Storage partition will be used by FCB/LittleFS/NVS
+		 * if enabled.
+		 */
+		storage_partition: partition@f8000 {
+			label = "storage";
+			reg = <0x000f8000 0x00008000>;
+		};
+	};
+};

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/nrf52840_mdk_dongle.yaml

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+identifier: nrf52840_mdk
+name: nRF52840-MDK-dongle
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+supported:
+  - usb_device
+  - ble
+  - ieee802154
+  - pwm

keyboards/zmk-config/config/boards/arm/nrf52840_mdk_dongle/nrf52840_mdk_dongle_defconfig

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+#
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+#
+
+CONFIG_SOC_SERIES_NRF52X=y
+CONFIG_SOC_NRF52840_QIAA=y
+CONFIG_BOARD_NRF52840_MDK_DONGLE=y
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# enable GPIO
+CONFIG_GPIO=y

keyboards/zmk-config/config/boards/shields/mdk_dongle/Kconfig.defconfig

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_MDK_DONGLE
+
+config ZMK_KEYBOARD_NAME
+    default "MDK Dongle"
+
+endif

keyboards/zmk-config/config/boards/shields/mdk_dongle/Kconfig.shield

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config SHIELD_MDK_DONGLE
+	def_bool $(shields_list_contains,mdk_dongle)

keyboards/zmk-config/config/boards/shields/mdk_dongle/mdk_dongle.keymap

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/bt.h>
+
+/ {
+	keymap {
+		compatible = "zmk,keymap";
+		
+		default_layer {
+			bindings = <
+				&kp Z
+			>;
+		};
+	};
+};

keyboards/zmk-config/config/boards/shields/mdk_dongle/mdk_dongle.overlay

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <dt-bindings/zmk/matrix_transform.h>
+
+/ {
+	kscan0: kscan {
+		compatible = "zmk,kscan-gpio-direct";
+
+		label = "KSCAN";
+
+		input-gpios
+			= <&gpio0 18 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>
+			;
+	};
+
+    default_transform: keymap_transform_0 {
+		compatible = "zmk,matrix-transform";
+		columns = <1>;
+		rows = <1>;
+
+		map = <RC(0,0)>;
+	};
+
+	chosen {
+		zmk,kscan = &kscan0;
+		zmk,matrix_transform = &default_transform;
+	};
+};