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config/boards/shields/banana_split/Kconfig.defconfig

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+# Copyright (c) 2022 Dan Bostian
+# SPDX-License-Identifier: MIT
+
+if SHIELD_BANANA_SPLIT
+
+config ZMK_KEYBOARD_NAME
+	default "Banana Split"
+
+endif
+

config/boards/shields/banana_split/Kconfig.shield

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+# Copyright (c) 2022 Dan Bostian
+# SPDX-License-Identifier: MIT
+
+config SHIELD_BANANA_SPLIT
+	def_bool $(shields_list_contains,banana_split)

config/boards/shields/banana_split/banana_split.conf

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+# Uncomment the following lines to enable the RGB Underglow
+# CONFIG_ZMK_RGB_UNDERGLOW=y
+# CONFIG_WS2812_STRIP=y

config/boards/shields/banana_split/banana_split.keymap

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+/*
+ * Copyright (c) 2022 Dan Bostian
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/bt.h>
+#include <dt-bindings/zmk/ext_power.h>
+#include <dt-bindings/zmk/outputs.h>
+
+/ {
+    // https://github.com/dbostian/bananasplit
+    macros {
+        bananasplit: bananasplit {
+            label = "bananasplit";
+            compatible = "zmk,behavior-macro";
+            #binding-cells = <0>;
+            tap-ms = <0>;
+            bindings
+                = <&kp G &kp I &kp T &kp H &kp U &kp B &kp DOT &kp C &kp O &kp M &kp SLASH>
+                , <&kp D &kp B &kp O &kp S &kp T &kp I &kp A &kp N &kp SLASH>
+                , <&kp B &kp A &kp N &kp A &kp N &kp A &kp S &kp P &kp L &kp I &kp T>
+                ;
+        };
+    };
+
+    keymap {
+        compatible =  "zmk,keymap" ;
+
+        default_layer {
+            bindings = <
+                &lt 1 LG(LC(Q)) &bananasplit &kp LG(LS(N3)) &kp LG(LS(N4))           &kp LG(LA(LEFT)) &kp LC(LEFT) &kp LC(RIGHT) &kp LG(LA(RIGHT))
+            >; 
+        };
+
+        lower {
+            bindings = <
+                &trans &none &none &none                                       &none &none &none &bootloader
+            >; 
+        };
+
+    };
+};

config/boards/shields/banana_split/banana_split.overlay

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+/*
+ * Copyright (c) 2022 Dan Bostian
+ * 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 = <2>;
+
+		map = <
+			RC(0,0) RC(1,0) RC(0,1) RC(1,1)         RC(0,2) RC(1,2) RC(0,3) RC(1,3)
+		>;
+	};
+
+	kscan0: kscan_0 {
+		compatible = "zmk,kscan-gpio-matrix";
+		label = "KSCAN";
+		diode-direction = "col2row";
+
+		col-gpios
+			= <&pro_micro 4 GPIO_ACTIVE_HIGH>
+			, <&pro_micro 5 GPIO_ACTIVE_HIGH>
+			, <&pro_micro 6 GPIO_ACTIVE_HIGH>
+			, <&pro_micro 7 GPIO_ACTIVE_HIGH>
+			;
+
+		row-gpios
+			= <&pro_micro 8 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			, <&pro_micro 9 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+			;
+	};
+};

config/boards/shields/banana_split/boards/nice_nano.overlay

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+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+ #include <dt-bindings/led/led.h>
+
+&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 = <5>; /* number of LEDs */
+		spi-one-frame = <0x70>;
+		spi-zero-frame = <0x40>;
+
+		color-mapping = <LED_COLOR_ID_GREEN LED_COLOR_ID_RED LED_COLOR_ID_BLUE>;
+	};
+};
+
+/ {
+	chosen {
+		zmk,underglow = &led_strip;
+	};
+};