Add support for the Clog

app/boards/shields/clog/Kconfig.defconfig

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_CLOG_LEFT
+
+config ZMK_KEYBOARD_NAME
+	default "Clog"
+
+config ZMK_SPLIT_BLE_ROLE_CENTRAL
+	default y
+
+endif
+
+if SHIELD_CLOG_LEFT || SHIELD_CLOG_RIGHT
+
+config ZMK_SPLIT
+	default y
+
+endif

app/boards/shields/clog/Kconfig.shield

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config SHIELD_CLOG_LEFT
+	def_bool $(shields_list_contains,clog_left)
+
+config SHIELD_CLOG_RIGHT
+	def_bool $(shields_list_contains,clog_right)

app/boards/shields/clog/README.md

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+# The Clog
+
+The Clog is a 34-key choc v1 split board by S'mores. This firmware works for both the [Clog][clog],
+as well as the [Sephirette][sephirette], the MX version. You can purchase kits for both boards
+at smoresboards.com.
+
+[clog]: https://github.com/smores56/clog
+[sephirette]: https://github.com/smores56/sephirette

app/boards/shields/clog/clog.conf

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+CONFIG_ZMK_KSCAN_DEBOUNCE_RELEASE_MS=10

app/boards/shields/clog/clog.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 = <34>;
+		rows = <1>;
+		map = <
+		         RC(0,0)  RC(0,1)  RC(0,2)  RC(0,3)    RC(0,20) RC(0,19) RC(0,18) RC(0,17)
+	RC(0,4) RC(0,5)  RC(0,6)  RC(0,7)  RC(0,8)  RC(0,9)    RC(0,26) RC(0,25) RC(0,24) RC(0,23) RC(0,22) RC(0,21)
+		RC(0,10) RC(0,11) RC(0,12) RC(0,13) RC(0,14)   RC(0,31) RC(0,30) RC(0,29) RC(0,28) RC(0,27)
+		                           RC(0,15) RC(0,16)   RC(0,33) RC(0,32)
+		>;
+	};
+
+	kscan0: kscan {
+		compatible = "zmk,kscan-gpio-direct";
+		label = "KSCAN";
+
+		input-gpios
+		= <&pro_micro 18 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 19 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 20 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 21 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 16 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 10 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 15 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 1  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 2  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 3  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 4  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 5  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 6  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 7  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 8  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		, <&pro_micro 9  (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>
+		;
+	};
+
+};

app/boards/shields/clog/clog.zmk.yml

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+file_format: "1"
+id: clog
+name: Clog
+type: shield
+url: https://github.com/smores56/clog
+requires: [pro_micro]
+features:
+  - keys
+siblings:
+  - clog_left
+  - clog_right

app/boards/shields/clog/clog_left.conf

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT

app/boards/shields/clog/clog_left.overlay

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "clog.dtsi"

app/boards/shields/clog/clog_right.conf

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+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT

app/boards/shields/clog/clog_right.overlay

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "clog.dtsi"
+
+&default_transform {
+	col-offset = <17>;
+};