[Keyboard] Add Marcopad

keyboards/marcopad/keyboard.json

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+{
+	"manufacturer": "pelegrini.ca",
+	"keyboard_name": "marcopad",
+	"maintainer": "Marco Pelegrini",
+	"development_board": "promicro_rp2040",
+	"diode_direction": "ROW2COL",
+	"features": {
+		"bootmagic": true,
+		"rgblight": false
+	},
+	"matrix_pins": {
+		"cols": ["GP4", "GP26", "GP27"],
+		"rows": ["GP15", "GP14", "GP29"]
+	},
+	"url": "https://pelegrini.ca/marcopad",
+	"usb": {
+		"device_version": "1.0.0",
+		"pid": "0x0000",
+		"vid": "0xFEED"
+	},
+	"ws2812": {
+		"driver": "vendor",
+		"pin": "GP28"
+	},
+	"rgblight": {
+		"led_count": 9,
+        "saturation_steps": 8,
+        "brightness_steps": 8,
+		"animations": {
+			"breathing": true,
+			"rainbow_mood": true,
+			"rainbow_swirl": true,
+			"snake": true,
+			"knight": true,
+			"christmas": true,
+			"static_gradient": true,
+			"rgb_test": true,
+			"alternating": true,
+			"twinkle": true
+		}
+	},
+	"community_layouts": ["ortho_3x3"],
+	"layouts": {
+		"LAYOUT_ortho_3x3": {
+			"layout": [
+				{ "matrix": [0, 0], "x": 0, "y": 0 },
+				{ "matrix": [0, 1], "x": 0, "y": 1 },
+				{ "matrix": [0, 2], "x": 0, "y": 2 },
+				{ "matrix": [1, 0], "x": 1, "y": 0 },
+				{ "matrix": [1, 1], "x": 1, "y": 1 },
+				{ "matrix": [1, 2], "x": 1, "y": 2 },
+				{ "matrix": [2, 0], "x": 2, "y": 0 },
+				{ "matrix": [2, 1], "x": 2, "y": 1 },
+				{ "matrix": [2, 2], "x": 2, "y": 2 }
+			]
+		}
+	}
+}

keyboards/marcopad/keymaps/backlit/keymap.c

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+// Copyright (c) 2022 Marco Pelegrini <[email protected]>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*
+     * ┌───┬───┬───┐
+     * │ 7 │ 8 │ 9 │
+     * ├───┼───┼───┤
+     * │ 4 │ 5 │ 6 │
+     * ├───┼───┼───┤
+     * │ 1 │ 2 │ 3 │
+     * └───┴───┴───┘
+     */
+    [0] = LAYOUT_ortho_3x3(
+        KC_P7,   KC_P8,   KC_P9,
+        KC_P4,   KC_P5,   KC_P6,
+        KC_P1,   KC_P2,   KC_P3
+    )
+};
+
+const uint16_t PROGMEM backlight_combo[] = {KC_P7, KC_P8, COMBO_END};
+combo_t key_combos[] = {
+    COMBO(backlight_combo, UG_NEXT)
+};

keyboards/marcopad/keymaps/backlit/rules.mk

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+# Copyright (c) 2022 Marco Pelegrini <[email protected]>
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+RGBLIGHT_ENABLE = yes
+COMBO_ENABLE = yes

keyboards/marcopad/keymaps/default/keymap.c

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+// Copyright (c) 2022 Marco Pelegrini <[email protected]>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*
+     * ┌───┬───┬───┐
+     * │ 7 │ 8 │ 9 │
+     * ├───┼───┼───┤
+     * │ 4 │ 5 │ 6 │
+     * ├───┼───┼───┤
+     * │ 1 │ 2 │ 3 │
+     * └───┴───┴───┘
+     */
+    [0] = LAYOUT_ortho_3x3(
+        KC_P7,   KC_P8,   KC_P9,
+        KC_P4,   KC_P5,   KC_P6,
+        KC_P1,   KC_P2,   KC_P3
+    )
+};

keyboards/marcopad/readme.md

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+# Marcopad
+
+![marcopad](https://pelegrini.ca/assets/img/marcopad/hardware/macropad.png)
+
+*A compact 3x3 keys macropad built with RP-2040 Zero*
+
+* Keyboard Maintainer: [pelegrini.ca](https://pelegrini.ca/marcopad)
+* Hardware Supported: [Marcopad](https://pelegrini.ca/marcopad)
+* Hardware Availability: [Marcopad](https://pelegrini.ca/marcopad)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make marcopad:default
+
+Flashing example for this keyboard:
+
+    make marcopad:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (top left key) and plug in the keyboard
+* **Physical reset button**: Using 2 paperclips, press and hold the BOOT button, then short press the RESET button on the back of the Marcopad
+* **Physical reset button + plug in**: Using a paperclip, press and hold the BOOT button, then plug in the Marcopad