Add RoMac plus v4 support on nice nano v1

app/boards/shields/romac_plus/Kconfig.defconfig

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+# Copyright (c) 2020 Pete Johanson, Richard Jones
+# SPDX-License-Identifier: MIT
+
+if SHIELD_ROMAC_PLUS
+
+config ZMK_KEYBOARD_NAME
+	default "RoMac_plus-v4"
+
+endif

app/boards/shields/romac_plus/Kconfig.shield

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+# Copyright (c) 2020 Pete Johanson, Richard Jones
+# SPDX-License-Identifier: MIT
+
+config SHIELD_ROMAC_PLUS
+	def_bool $(shields_list_contains,romac_plus)

app/boards/shields/romac_plus/boards/nice_nano.overlay

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+&spi1 {
+	compatible = "nordic,nrf-spi";
+	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 = <10>; /* arbitrary; change at will */
+		spi-one-frame = <0x70>;
+		spi-zero-frame = <0x40>;
+	};
+};
+
+/ {
+	chosen {
+		zmk,underglow = &led_strip;
+	};
+};

app/boards/shields/romac_plus/romac_plus.conf

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+# Uncomment to enable encoder
+CONFIG_EC11=y
+CONFIG_EC11_TRIGGER_GLOBAL_THREAD=y

app/boards/shields/romac_plus/romac_plus.dtsi

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+/*
+ * Copyright (c) 2020 Pete Johanson
+ *
+ * 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 = <3>;
+		rows = <4>;
+
+		map = <
+RC(0,0) RC(0,1) RC(0,2)
+RC(1,0) RC(1,1) RC(1,2)
+RC(2,0) RC(2,1) RC(2,2)
+RC(3,0) RC(3,1) RC(3,2)
+		>;
+	};
+
+	kscan0: kscan {
+		compatible = "zmk,kscan-gpio-matrix";
+		label = "KSCAN";
+
+		diode-direction = "col2row";
+		row-gpios
+			= <&pro_micro_d 5 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 4 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 0 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro_d 1 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			;
+		
+	};
+
+	left_encoder: encoder_left {
+		compatible = "alps,ec11";
+		label = "LEFT_ENCODER";
+		a-gpios = <&pro_micro_d 16 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		b-gpios = <&pro_micro_d 14 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+		resolution = <4>;
+		status = "disabled";
+	};
+
+	sensors {
+		compatible = "zmk,keymap-sensors";
+		sensors = <&left_encoder>;
+	};
+	
+	bt_unpair_combo: bt_unpair_combo {
+		compatible = "zmk,bt-unpair-combo";
+	};
+
+	// TODO: per-key RGB node(s)?
+};

app/boards/shields/romac_plus/romac_plus.keymap

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+/*
+ * Copyright (c) 2020 Pete Johanson, Richard Jones
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+
+/ {
+    keymap {
+        compatible = "zmk,keymap";
+        
+        default_layer {
+// -------------------
+// | 7      |  8  |  9  |
+// | 4      |  5  |  6  |
+// | 1      |  2  |  3  |
+// | MO(1)  |  0  |  .  |
+// ----------------------
+            bindings = <
+    &kp NUM_7 &kp NUM_8 &kp NUM_9 
+    &kp NUM_4 &kp NUM_5 &kp NUM_6 
+    &kp NUM_1 &kp NUM_2 &kp NUM_3 
+    &cp M_PLAY &kp NUM_0 &kp DOT 
+            >;
+
+            sensor-bindings = <&inc_dec_cp M_NEXT M_PREV>;
+        };
+
+        // nav_layer {
+// -----------------------
+// | _ |  HOME  |  PGUP  |
+// | _ |  END   |  PGDN  |
+// | _ |  _     |  _     |
+// | _ |  _     |  RET   |
+// -----------------------
+    //         bindings = <
+    // &trans &kp HOME &kp PGUP 
+    // &trans &kp END  &kp PGDN 
+    // &trans &trans   &trans .0
+    // &trans &trans   &kp RET
+    //         >;
+
+    //         sensor-bindings = <&inc_dec_kp A B>;
+    //     };
+    };
+};

app/boards/shields/romac_plus/romac_plus.overlay

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+/*
+ * Copyright (c) 2020 Pete Johanson, Richard Jones
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "romac_plus.dtsi"
+
+/ {
+	chosen {
+		zmk,kscan = &kscan0;
+	};
+
+	kscan0: kscan {
+		compatible = "zmk,kscan-gpio-matrix";
+		label = "KSCAN";
+
+		diode-direction = "col2row";
+
+		col-gpios
+			= <&pro_micro_a 1 GPIO_ACTIVE_HIGH>
+			, <&pro_micro_a 2 GPIO_ACTIVE_HIGH>
+			, <&pro_micro_a 3 GPIO_ACTIVE_HIGH>
+			;
+
+	};
+
+	bt_unpair_combo: bt_unpair_combo {
+		compatible = "zmk,bt-unpair-combo";
+		key-positions = <0 11>;
+	};
+
+};
+
+&left_encoder {
+    status = "okay";
+};