Initial handwire proton-c shield for testing.

app/boards/shields/petejohanson_proton_handwire/Kconfig.defconfig

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+
+if SHIELD_PETEJOHANSON_PROTON_HANDWIRE
+
+config ZMK_KEYBOARD_NAME
+	default "Pete's Proton Handwire"
+
+config ZMK_USB
+	default y
+
+config ZMK_ACTION_MOD_TAP
+	default y
+
+endif

app/boards/shields/petejohanson_proton_handwire/Kconfig.shield

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+# Copyright (c) 2020 Pete Johanson
+# SPDX-License-Identifier: MIT
+
+config SHIELD_PETEJOHANSON_PROTON_HANDWIRE
+	def_bool $(shields_list_contains,petejohanson_proton_handwire)

app/boards/shields/petejohanson_proton_handwire/keymaps/default/include/keymap.h

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+
+#include <dt-bindings/zmk/keys.h>
+
+#define CC_RAIS ZC_CSTM(1)
+#define CC_LOWR ZC_CSTM(2)

app/boards/shields/petejohanson_proton_handwire/keymaps/default/keymap.c

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+
+#include <zmk/keys.h>
+#include <zmk/keymap.h>
+#include <keymap.h>
+
+bool zmk_handle_key_user(struct zmk_key_event *key_event)
+{
+	switch (key_event->key)
+	{
+	case CC_LOWR:
+		if (key_event->pressed)
+		{
+			zmk_keymap_layer_activate(1);
+		}
+		else
+		{
+			zmk_keymap_layer_deactivate(1);
+		}
+
+		return false;
+	case CC_RAIS:
+		if (key_event->pressed)
+		{
+			zmk_keymap_layer_activate(2);
+		}
+		else
+		{
+			zmk_keymap_layer_deactivate(2);
+		}
+		return false;
+	}
+
+	return true;
+};

app/boards/shields/petejohanson_proton_handwire/keymaps/default/keymap.overlay

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+#include <dt-bindings/zmk/keys.h>
+#include <keymap.h>
+
+/ {
+	chosen {
+		zmk,keymap = &keymap0;
+	};
+	keymap0: keymap {
+		compatible = "zmk,keymap";
+		label ="Default keymap";
+		layers = <&default &lower &raise>;
+	};
+
+	layers {
+		compatible = "zmk,layers";
+
+		default: layer_0 {
+			label = "DEFAULT";
+			keys =
+	<
+	KC_A MT(MOD_LSFT, KC_B)
+	CC_RAIS CC_LOWR
+	>;
+		};
+
+		lower: layer_1 {
+			label = "LOWER";
+			keys = <
+			KC_MPLY KC_MNXT
+			ZC_TRNS ZC_TRNS
+			>;
+		};
+
+		raise: layer_2 {
+			label = "RAISE";
+			keys = <
+			KC_C KC_D
+			ZC_TRNS ZC_TRNS
+			>;
+		};
+	};
+};

app/boards/shields/petejohanson_proton_handwire/petejohanson_proton_handwire.overlay

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+
+/ {
+	chosen {
+		zmk,kscan = &kscan0;
+	};
+
+	kscan0: kscan {
+		compatible = "gpio-kscan";
+		label = "KSCAN";
+
+		diode-direction = "row2col";
+		row-gpios = <&pro_micro_pins 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
+		            <&pro_micro_pins 7 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+		col-gpios = <&pro_micro_pins 8 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
+		            <&pro_micro_pins 9 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+	};
+};