feat(boards): Add BDN9 Rev2 board.

* Onboard stm32f072.
* 3 possible encoder positions.
* Underglow/per-key not yet support.

.github/workflows/build.yml

@@ -57,6 +57,7 @@ jobs:
           - tidbit
         cmake-args: [""]
         include:
+          - board: bdn9_rev2
           - board: dz60rgb_rev1
           - board: nrf52840_m2
             shield: m60

app/boards/arm/bdn9/Kconfig.board

@@ -0,0 +1,8 @@
+# keeb.io BDN9 board configuration
+
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config BOARD_BDN9
+	bool "BDN9 rev2"
+	depends on SOC_STM32F072XB

app/boards/arm/bdn9/Kconfig.defconfig

@@ -0,0 +1,17 @@
+# keeb.io BDN9 board configuration
+
+# Copyright (c) 2020 Pete Johanson
+# SPDX-License-Identifier: MIT
+
+if BOARD_BDN9
+
+config BOARD
+	default "bdn9_rev2"
+
+config ZMK_KEYBOARD_NAME
+	default "BDN9 Rev2"
+
+config ZMK_USB
+	default y
+
+endif # BOARD_BDN9

app/boards/arm/bdn9/README.md

@@ -0,0 +1,37 @@
+# Building ZMK for the BDN9
+
+Some general notes/commands for building standard BDN9 layouts from the assembly documentation.
+
+## Standard Build
+
+```
+west build -p -d build/bdn9 --board bdn9_rev2
+```
+
+## Encoder Notes
+
+If you built your BDN9 with encoders, you'll need to change the following in your local BDN9 config or add them to the end of the file.
+
+```
+CONFIG_EC11=y
+CONFIG_EC11_TRIGGER_GLOBAL_THREAD=y
+```
+
+Then, you'll want to uncomment the necessary encoder lines in your `bdn9_rev2.keymap`:
+
+```
+&sensors {
+     status = "okay";
+     sensors = <&left_encoder &mid_encoder &right_encoder>;
+};
+
+&left_encoder { status = "okay"; };
+&mid_encoder { status = "okay"; };
+&right_encoder { status = "okay"; };
+```
+
+And then add the correct `sensor-bindings` array to each keymap layer, e.g.:
+
+```
+sensor-bindings = <&inc_dec_kp PG_UP PG_DN &inc_dec_kp M_VOLU M_VOLD &inc_dec_kp C_PREV C_NEXT>;
+```

app/boards/arm/bdn9/bdn9_rev2.dts

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/dts-v1/;
+#include <st/f0/stm32f072Xb.dtsi>
+
+/ {
+	model = "Keeb.io BDN9 rev2";
+	compatible = "keebio,bdn9", "st,stm32f072";
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zmk,kscan = &kscan;
+		/* TODO: Enable once the GPIO bitbanging driver supports STM32
+		zmk,underglow = &led_strip;
+		*/
+	};
+	
+	kscan: kscan {
+		compatible = "zmk,kscan-gpio-direct";
+		label = "KSCAN";
+
+		input-gpios
+			= <&gpiob 12 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiob 5  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiob 6  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiob 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiob 4  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiob 7  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpioa 3  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiof 1  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			, <&gpiof 0  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+			;
+	};
+
+	/*
+	led_strip: ws2812 {
+		compatible = "worldsemi,ws2812-gpio";
+		label = "WS2812";
+
+		in-gpios = <&gpiob 15 0>;
+
+		chain-length = <9>;
+	};
+	*/
+
+	left_encoder: encoder_left {
+		compatible = "alps,ec11";
+		label = "LEFT_ENCODER";
+		a-gpios = <&gpioa 4 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		b-gpios = <&gpioa 8 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		resolution = <4>;
+		status = "disabled";
+	};
+	mid_encoder: encoder_mid {
+		compatible = "alps,ec11";
+		label = "MID_ENCODER";
+		a-gpios = <&gpioa 9 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		b-gpios = <&gpioa 10 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		resolution = <4>;
+		status = "disabled";
+	};
+	right_encoder: encoder_right {
+		compatible = "alps,ec11";
+		label = "RIGHT_ENCODER";
+		a-gpios = <&gpioa 15 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		b-gpios = <&gpiob 3 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		resolution = <4>;
+		status = "disabled";
+	};
+
+	sensors: sensors {
+		compatible = "zmk,keymap-sensors";
+		status = "disabled";
+		sensors = <>;
+	};
+};
+
+&usb {
+	status = "okay";
+};
+
+&rtc {
+	status = "okay";
+};
+
+&flash0 {
+	/*
+	 * For more information, see:
+	 * http://docs.zephyrproject.org/latest/guides/dts/index.html#flash-partitions
+	 */
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* Set 6Kb of storage at the end of the 128Kb of flash */
+		storage_partition: partition@3e800 {
+			label = "storage";
+			reg = <0x0001e800 0x00001800>;
+		};
+	};
+};

app/boards/arm/bdn9/bdn9_rev2.keymap

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+
+/* Uncomment and keep whatever encoders are on your BDN9
+&sensors {
+	status = "okay";
+	sensors = <&left_encoder &mid_encoder &right_encoder>;
+};
+*/
+
+// Uncomment each encoder installed on your BDN9
+// &left_encoder { status = "okay"; };
+// &mid_encoder { status = "okay"; };
+// &right_encoder { status = "okay"; };
+
+/ {
+	keymap {
+		compatible = "zmk,keymap";
+
+		default_layer {
+			bindings = <
+				&kp HOME  &kp K_PP &kp END
+				&kp PG_UP &kp UP   &kp PG_DN
+				&kp LEFT  &kp DOWN &kp RIGHT
+			>;
+			/* Uncomment and add necessary bindings. This examples is for one encoder
+			sensor-bindings = <&inc_dec_kp PG_UP PG_DN>;
+			*/
+		};
+	};
+};
+

app/boards/arm/bdn9/bdn9_rev2.yaml

@@ -0,0 +1,14 @@
+identifier: bdn9
+name: keeb.io BDN9
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 40
+supported:
+  - encoders
+  - switches
+  - underglow
+  - per_key

app/boards/arm/bdn9/bdn9_rev2_defconfig

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: MIT
+
+CONFIG_SOC_SERIES_STM32F0X=y
+CONFIG_SOC_STM32F072XB=y
+# 72MHz system clock
+CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=72000000
+
+# Floating Point Options
+CONFIG_FPU=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+# Needed to reduce this to size that will fit on F072
+CONFIG_HEAP_MEM_POOL_SIZE=1024
+
+# clock configuration
+CONFIG_CLOCK_CONTROL=y
+
+# Clock configuration for Cube Clock control driver
+CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
+# use HSI as PLL input
+CONFIG_CLOCK_STM32_PLL_SRC_HSI=y
+# produce 72MHz clock at PLL output
+CONFIG_CLOCK_STM32_PLL_PREDIV=1
+CONFIG_CLOCK_STM32_PLL_MULTIPLIER=12
+CONFIG_CLOCK_STM32_AHB_PRESCALER=1
+CONFIG_CLOCK_STM32_APB1_PRESCALER=2
+CONFIG_CLOCK_STM32_APB2_PRESCALER=1

app/boards/arm/bdn9/board.cmake

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: MIT
+
+board_runner_args(dfu-util "--pid=0483:df11" "--alt=0" "--dfuse")
+board_runner_args(jlink "--device=STM32F072CB" "--speed=4000")
+
+include(${ZEPHYR_BASE}/boards/common/dfu-util.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

docs/docs/hardware.md

@@ -19,6 +19,7 @@ That being said, there are currently only a few specific [boards](/docs/faq#what
 - [nrfMicro](https://github.com/joric/nrfmicro) (`nrfmicro_13`, `nrfmicro_11`, `nrfmicro_11_flipped`)
 - [BlueMicro840](https://store.jpconstantineau.com/#/group/bluemicro) (`bluemicro840_v1`)
 - [QMK Proton-C](https://qmk.fm/proton-c/) (`proton_c`)
+- [BDN9 Rev2](https://keeb.io/products/bdn9-rev-2-3x3-9-key-macropad-rotary-encoder-and-rgb) (`bdn9_rev2`)
 
 ## Keyboard Shields