Add files for Spacepad macropad

app/boards/shields/spacepad/Kconfig.defconfig

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_SPACEPAD
+
+config ZMK_KEYBOARD_NAME
+	default "Spacepad v1"
+
+endif

app/boards/shields/spacepad/Kconfig.shield

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

app/boards/shields/spacepad/boards/nice_nano.overlay

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+&spi1 {
+	compatible = "nordic,nrf-spim";
+	status = "okay";
+	mosi-pin = <6>;
+	// Unused pins, needed for SPI definition, but not used by the ws2812 driver itself.
+	sck-pin = <5>;
+	miso-pin = <7>;
+
+	led_strip: ws2812@0 {
+		compatible = "worldsemi,ws2812-spi";
+		label = "WS2812";
+
+		/* SPI */
+		reg = <0>; /* ignored, but necessary for SPI bindings */
+		spi-max-frequency = <4000000>;
+
+		/* WS2812 */
+		chain-length = <12>; /* arbitrary; change at will */
+		spi-one-frame = <0x70>;
+		spi-zero-frame = <0x40>;
+	};
+};
+
+/ {
+	chosen {
+		zmk,underglow = &led_strip;
+	};
+};

app/boards/shields/spacepad/spacepad.conf

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+# Uncomment to enable encoder
+CONFIG_EC11=y
+CONFIG_EC11_TRIGGER_GLOBAL_THREAD=y

app/boards/shields/spacepad/spacepad.dtsi

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <dt-bindings/zmk/matrix_transform.h>
+
+/ {
+	chosen {
+		zmk,kscan = &kscan0;
+		zmk,matrix_transform = &default_transform;
+	};
+
+	default_transform: keymap_transform_0 {
+		compatible = "zmk,matrix-transform";
+		columns = <4>;
+		rows = <5>;
+
+		map = <
+RC(0,0) RC(0,1) RC(0,2) RC(0,3)
+RC(1,0) RC(1,1) RC(1,2) RC(1,3)
+RC(2,0) RC(2,1) RC(2,2) RC(2,3)
+RC(3,0) RC(3,1) RC(3,2) RC(3,3)
+RC(4,0) RC(4,1) RC(4,2) RC(4,3)
+		>;
+	};
+
+	kscan0: kscan {
+		compatible = "zmk,kscan-gpio-matrix";
+		label = "KSCAN";
+
+		diode-direction = "row2col";
+
+		row-gpios
+			= <&pro_micro_d 1 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 0 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 4 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 10 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 16 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			;
+
+	};
+
+	left_encoder: encoder_left {
+		compatible = "alps,ec11";
+		label = "LEFT_ENCODER";
+		a-gpios = <&pro_micro_a 1 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		b-gpios = <&pro_micro_a 2 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		resolution = <4>;
+		status = "okay";
+	};
+
+	sensors {
+		compatible = "zmk,keymap-sensors";
+		sensors = <&left_encoder>;
+	};
+
+	// TODO: per-key RGB node(s)?
+};

app/boards/shields/spacepad/spacepad.keymap

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/bt.h>
+#include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/outputs.h>
+
+/ {
+    keymap {
+        compatible = "zmk,keymap";
+
+        default_layer {
+// --------------------------
+// | 7      |  8  |  9      |
+// | 4      |  5  |  6      |
+// | 1      |  2  |  3      |
+// | M_PLAY |  0  |  MO(1)  |
+// --------------------------
+            bindings = <
+    &kp N7   &kp N8 &kp N9    &kp HOME
+    &kp N4   &kp N5 &kp N6    &kp END
+    &kp N1   &kp N2 &kp N3    &kp DEL
+    &kp C_PP &kp N0 &mo 1     &kp PG_DN
+    &none    &none  &none     &kp INS
+            >;
+
+            sensor-bindings = <&inc_dec_kp INS PG_UP>;
+        };
+
+         nav_layer {
+// --------------------------
+// | BT_CLR |  HOME |  PGUP |
+// | _      |  END  |  PGDN |
+// | _      |  _    |  _    |
+// | _      |  _    |  _    |
+// --------------------------
+             bindings = <
+     &bt BT_CLR       &trans          &kp PG_UP &kp UP
+     &out OUT_TOG     &out OUT_USB    &out OUT_BLE &kp DOWN
+     &reset           &trans     &trans    &kp LEFT
+     &bootloader     &trans   &trans       &kp RIGHT
+     &trans     &trans   &trans            &kp INS
+             >;
+
+             sensor-bindings = <&inc_dec_kp A B>;
+         };
+    };
+};

app/boards/shields/spacepad/spacepad.overlay

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "spacepad.dtsi"
+
+&kscan0 {
+	col-gpios
+			= <&pro_micro_d 6 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 8 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 9 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+		;
+};
+
+&left_encoder {
+    status = "okay";
+};