Add Mikoto board

app/boards/arm/mikoto/CMakeLists.txt

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+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
+)
+
+if(CONFIG_PINMUX)
+zephyr_library()
+zephyr_library_sources(pinmux.c)
+zephyr_library_include_directories(${ZEPHYR_BASE}/drivers)
+endif()

app/boards/arm/mikoto/Kconfig

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+config BOARD_ENABLE_DCDC
+	bool "Enable DCDC mode"
+	select SOC_DCDC_NRF52X
+	default y
+	depends on (BOARD_MIKOTO_520)
+
+choice BOARD_MIKOTO_CHARGER_CURRENT
+    prompt "Charge current to supply to attached batteries"
+	depends on (BOARD_MIKOTO_520)
+
+config BOARD_MIKOTO_CHARGER_CURRENT_40MA
+    bool "40mA charge current, for battery capacity 40mAh or higher"
+
+config BOARD_MIKOTO_CHARGER_CURRENT_100MA
+    bool "100mA charge current, for battery capacity 100mAh or higher"
+
+config BOARD_MIKOTO_CHARGER_CURRENT_150MA
+    bool "150mA charge current, for battery capacity 150mAh or higher"
+
+config BOARD_MIKOTO_CHARGER_CURRENT_250MA
+    bool "250mA charge current, for battery capacity 250mAh or higher"
+
+config BOARD_MIKOTO_CHARGER_CURRENT_350MA
+    bool "350mA charge current, for battery capacity 350mAh or higher"
+
+config BOARD_MIKOTO_CHARGER_CURRENT_NONE
+    bool "Disable charge current"
+
+endchoice

app/boards/arm/mikoto/Kconfig.board

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+# mikoto board configuration
+
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config BOARD_MIKOTO_520
+	bool "mikoto_520"
+	depends on SOC_NRF52840_QIAA

app/boards/arm/mikoto/Kconfig.defconfig

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+# Electronut Labs Papyr board configuration
+
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if BOARD_MIKOTO_520
+
+config BOARD
+	default "mikoto"
+
+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
+
+config PINMUX
+	default y
+
+choice BOARD_MIKOTO_CHARGER_CURRENT
+    default BOARD_MIKOTO_CHARGER_CURRENT_100MA
+endchoice
+
+config ZMK_BATTERY_VOLTAGE_DIVIDER
+	default y
+
+endif # BOARD_MIKOTO_520

app/boards/arm/mikoto/arduino_pro_micro_pins.dtsi

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+
+/ {
+	pro_micro: connector {
+		compatible = "arduino-pro-micro";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map
+			= <0 0 &gpio0 4 0>		/* D0 */
+			, <1 0 &gpio0 8 0>		/* D1 */
+			, <2 0 &gpio0 17 0>		/* D2 */
+			, <3 0 &gpio0 20 0>		/* D3 */
+			, <4 0 &gpio0 22 0>		/* D4/A6 */
+			, <5 0 &gpio0 24 0>		/* D5 */
+			, <6 0 &gpio1 0 0>		/* D6/A7 */
+			, <7 0 &gpio1 2 0>		/* D7 */
+			, <8 0 &gpio1 4 0>		/* D8/A8 */
+			, <9 0 &gpio1 6 0>		/* D9/A9 */
+			, <10 0 &gpio0 9 0>	/* D10/A10 */
+			, <16 0 &gpio0 10 0>	/* D16 */
+			, <14 0 &gpio1 13 0>	/* D14 */
+			, <15 0 &gpio0 2 0>	/* D15 */
+			, <18 0 &gpio0 29 0>	/* D18/A0 */
+			, <19 0 &gpio0 31 0>	/* D19/A1 */
+			, <20 0 &gpio0 25 0>	/* D20/A2 */
+			, <21 0 &gpio0 11 0>	/* D21/A3 */
+			;
+	};
+
+	pro_micro_a: connector_a {
+		compatible = "arduino-pro-micro";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map
+			= <0 0 &gpio0 29 0>	/* D18/A0 */
+			, <1 0 &gpio0 31 0>	/* D19/A1 */
+			, <2 0 &gpio0 25 0>	/* D20/A2 */
+			, <3 0 &gpio0 11 0>	/* D21/A3 */
+			, <6 0 &gpio0 22 0>	/* D4/A6 */
+			, <7 0 &gpio1 0 0>	/* D6/A7 */
+			, <8 0 &gpio1 4 0>	/* D8/A8 */
+			, <9 0 &gpio1 6 0>	/* D9/A9 */
+			, <10 0 &gpio0 9 0>	/* D10/A10 */
+			;
+	};
+};
+
+
+pro_micro_d: &pro_micro {};
+pro_micro_i2c: &i2c0 {};
+pro_micro_spi: &spi0 {};
+pro_micro_serial: &uart0 {};

app/boards/arm/mikoto/board.cmake

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+# 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)

app/boards/arm/mikoto/mikoto_520.dts

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/dts-v1/;
+#include <nordic/nrf52840_qiaa.dtsi>
+#include "arduino_pro_micro_pins.dtsi"
+
+/ {
+	model = "mikoto";
+	compatible = "zhiayang,mikoto";
+
+	chosen {
+		zephyr,code-partition = &code_partition;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		blue_led: led_0 {
+			gpios = <&gpio0 15 GPIO_ACTIVE_HIGH>;
+			label = "Blue LED";
+		};
+	};
+
+	ext-power {
+		compatible = "zmk,ext-power-generic";
+		label = "EXT_POWER";
+		control-gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
+	};
+
+	vbatt {
+		compatible = "zmk,battery-voltage-divider";
+		label = "BATTERY";
+		io-channels = <&adc 2>;
+		output-ohms = <10000000>;
+		full-ohms = <(10000000 + 4000000)>;
+	};
+};
+
+&adc {
+	status = "okay";
+};
+
+&gpiote {
+	status = "okay";
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&i2c0 {
+	compatible = "nordic,nrf-twi";
+	sda-pin = <17>;
+	scl-pin = <20>;
+};
+
+&uart0 {
+	compatible = "nordic,nrf-uarte";
+	tx-pin = <8>;
+	rx-pin = <4>;
+};
+
+&usbd {
+	status = "okay";
+};
+
+
+&flash0 {
+	/*
+	 * For more information, see:
+	 * http://docs.zephyrproject.org/latest/devices/dts/flash_partitions.html
+	 */
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		sd_partition: partition@0 {
+			label = "softdevice";
+			reg = <0x00000000 0x00026000>;
+		};
+		code_partition: partition@26000 {
+			label = "code_partition";
+			reg = <0x00026000 0x000c6000>;
+		};
+
+		/*
+		 * The flash starting at 0x000ec000 and ending at
+		 * 0x000f3fff is reserved for use by the application.
+		 */
+
+		/*
+		 * Storage partition will be used by FCB/LittleFS/NVS
+		 * if enabled.
+		 */
+		storage_partition: partition@ec000 {
+			label = "storage";
+			reg = <0x000ec000 0x00008000>;
+		};
+
+		boot_partition: partition@f4000 {
+			label = "adafruit_boot";
+			reg = <0x000f4000 0x0000c000>;
+		};
+	};
+};

app/boards/arm/mikoto/mikoto_520.yaml

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+identifier: mikoto_520
+name: mikoto_520
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+supported:
+  - adc
+  - usb_device
+  - ble
+  - ieee802154
+  - pwm
+  - watchdog

app/boards/arm/mikoto/mikoto_520.zmk.yml

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+file_format: "1"
+id: mikoto_520
+name: Mikoto 5.20
+type: board
+arch: arm
+outputs:
+  - usb
+  - ble
+url: https://github.com/zhiayang/mikoto
+exposes: [pro_micro]

app/boards/arm/mikoto/mikoto_520_defconfig

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+# SPDX-License-Identifier: MIT
+
+CONFIG_SOC_SERIES_NRF52X=y
+CONFIG_SOC_NRF52840_QIAA=y
+CONFIG_BOARD_MIKOTO_520=y
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+CONFIG_USE_DT_CODE_PARTITION=y
+
+CONFIG_MPU_ALLOW_FLASH_WRITE=y
+CONFIG_NVS=y
+CONFIG_SETTINGS_NVS=y
+CONFIG_FLASH=y
+CONFIG_FLASH_PAGE_LAYOUT=y
+CONFIG_FLASH_MAP=y

app/boards/arm/mikoto/pinmux.c

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <kernel.h>
+#include <device.h>
+#include <init.h>
+#include <drivers/gpio.h>
+#include <sys/sys_io.h>
+#include <devicetree.h>
+
+static int pinmux_mikoto_init(const struct device *port) {
+    ARG_UNUSED(port);
+
+#if CONFIG_BOARD_MIKOTO_520
+    const struct device *p0 = device_get_binding("GPIO_0");
+    const struct device *p1 = device_get_binding("GPIO_1");
+#if CONFIG_BOARD_MIKOTO_CHARGER_CURRENT_40MA
+    gpio_pin_configure(p0, 26, GPIO_INPUT | GPIO_PULL_DOWN);
+    gpio_pin_configure(p1, 15, GPIO_INPUT);
+#elif CONFIG_BOARD_MIKOTO_CHARGER_CURRENT_100MA
+    gpio_pin_configure(p0, 26, GPIO_OUTPUT);
+    gpio_pin_set(p0, 26, 0);
+    gpio_pin_configure(p1, 15, GPIO_INPUT);
+#elif CONFIG_BOARD_MIKOTO_CHARGER_CURRENT_150MA
+    gpio_pin_configure(p0, 26, GPIO_OUTPUT);
+    gpio_pin_set(p0, 26, 0);
+    gpio_pin_configure(p1, 15, GPIO_INPUT | GPIO_PULL_DOWN);
+#elif CONFIG_BOARD_MIKOTO_CHARGER_CURRENT_250MA
+    gpio_pin_configure(p0, 26, GPIO_INPUT);
+    gpio_pin_configure(p1, 15, GPIO_OUTPUT);
+    gpio_pin_set(p1, 15, 0);
+#elif CONFIG_BOARD_MIKOTO_CHARGER_CURRENT_350MA
+    gpio_pin_configure(p0, 26, GPIO_OUTPUT);
+    gpio_pin_set(p0, 26, 0);
+    gpio_pin_configure(p1, 15, GPIO_OUTPUT);
+    gpio_pin_set(p1, 15, 0);
+#elif CONFIG_BOARD_MIKOTO_CHARGER_CURRENT_NONE
+    gpio_pin_configure(p0, 26, GPIO_INPUT);
+    gpio_pin_configure(p1, 15, GPIO_INPUT);
+#endif
+#endif
+    return 0;
+}
+
+SYS_INIT(pinmux_mikoto_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);