Add CXT Studio 12E3 keyboard

keyboards/cxt_studio/12e3/keyboard.json

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+{
+    "manufacturer": "cxt_studio",
+    "keyboard_name": "cxt_studio 12E3",
+    "maintainer": "muge",
+    "bootloader": "atmel-dfu",
+    "diode_direction": "ROW2COL",
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true,
+        "encoder": true,
+        "rgb_matrix": true
+    },
+    "ws2812": {
+        "pin": "F7"
+    },
+    "matrix_pins": {
+        "cols": ["D4", "D7", "B4", "B5"],
+        "rows": ["C7", "C6", "D6", "F4"]
+    },
+    "encoder": {
+        "rotary": [
+            {"pin_a": "F5", "pin_b": "F6"},
+            {"pin_a": "E6", "pin_b": "F0"},
+            {"pin_a": "B3", "pin_b": "B2", "resolution": 2}
+        ]
+    },
+    "processor": "atmega32u4",
+    "rgb_matrix": {
+        "animations": {
+            "breathing": true,
+            "typing_heatmap": true,
+            "digital_rain": true,
+            "solid_reactive_simple": true,
+            "solid_reactive": true,
+            "solid_reactive_wide": true,
+            "solid_reactive_multiwide": true,
+            "solid_reactive_cross": true,
+            "solid_reactive_multicross": true,
+            "solid_reactive_nexus": true,
+            "solid_reactive_multinexus": true,
+            "splash": true,
+            "multisplash": true,
+            "solid_splash": true,
+            "solid_multisplash": true
+        },
+        "default": {
+            "animation": "solid_reactive_simple"
+        },
+        "driver": "ws2812",
+        "layout": [
+            {"flags": 4, "matrix": [0, 3], "x": 3, "y": 0},
+            {"flags": 4, "matrix": [0, 2], "x": 2, "y": 0},
+            {"flags": 4, "matrix": [0, 1], "x": 1, "y": 0},
+            {"flags": 4, "matrix": [0, 0], "x": 0, "y": 0},
+            {"flags": 4, "matrix": [1, 0], "x": 0, "y": 1},
+            {"flags": 4, "matrix": [1, 1], "x": 1, "y": 1},
+            {"flags": 4, "matrix": [1, 2], "x": 2, "y": 1},
+            {"flags": 4, "matrix": [1, 3], "x": 3, "y": 1},
+            {"flags": 4, "matrix": [2, 3], "x": 3, "y": 2},
+            {"flags": 4, "matrix": [2, 2], "x": 2, "y": 2},
+            {"flags": 4, "matrix": [2, 1], "x": 1, "y": 2},
+            {"flags": 4, "matrix": [2, 0], "x": 0, "y": 2}
+        ]
+    },
+    "url": "",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x12E3",
+        "vid": "0x0215"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0},
+                {"matrix": [0, 2], "x": 2, "y": 0},
+                {"matrix": [0, 3], "x": 3, "y": 0},
+
+                {"matrix": [3, 2], "x": 4, "y": 0},
+                {"matrix": [3, 3], "x": 5, "y": 0},
+
+                {"matrix": [1, 0], "x": 0, "y": 1},
+                {"matrix": [1, 1], "x": 1, "y": 1},
+                {"matrix": [1, 2], "x": 2, "y": 1},
+                {"matrix": [1, 3], "x": 3, "y": 1},
+
+                {"matrix": [3, 1], "x": 4, "y": 1, "w": 2, "h": 2},
+
+                {"matrix": [2, 0], "x": 0, "y": 2},
+                {"matrix": [2, 1], "x": 1, "y": 2},
+                {"matrix": [2, 2], "x": 2, "y": 2},
+                {"matrix": [2, 3], "x": 3, "y": 2}
+            ]
+        }
+    }
+}
+

keyboards/cxt_studio/12e3/keymaps/default/keymap.c

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+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+enum my_layers {
+    _BASE,
+    _RGBL,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    [_BASE] = LAYOUT(
+        KC_PSCR, KC_CUT, KC_COPY, KC_PSTE,  MS_BTN3, RM_TOGG,
+        KC_CALC, KC_UNDO, KC_MPLY, KC_MNXT,     KC_MUTE,
+        MO(1), KC_LGUI, KC_DEL, KC_APP
+    ),
+
+    [_RGBL] = LAYOUT(
+        RM_NEXT, RM_SATU, KC_INS, KC_DEL,   _______, _______,
+        RM_PREV, RM_SATD, KC_PGUP, KC_HOME,     _______,
+        _______, QK_BOOT, KC_PGDN, KC_END
+    ),
+};
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
+    // Encoders: Left, Right, Big
+    [_BASE] = {
+        ENCODER_CCW_CW(MS_WHLD, MS_WHLU),
+        ENCODER_CCW_CW(KC_PGDN, KC_PGUP),
+        ENCODER_CCW_CW(KC_VOLD, KC_VOLU)
+    },
+    [_RGBL] = {
+        ENCODER_CCW_CW(RM_HUED, RM_HUEU),
+        ENCODER_CCW_CW(RM_SPDD, RM_SPDU),
+        ENCODER_CCW_CW(RM_VALD, RM_VALU)
+    },
+};
+#endif

keyboards/cxt_studio/12e3/keymaps/default/rules.mk

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+ENCODER_MAP_ENABLE = yes

keyboards/cxt_studio/12e3/readme.md

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+# cxt_studio/12e3
+
+![cxt_studio/12e3](https://qmk-12e3.netlify.app/12e3.png)
+
+3x4 ortho layout, with 3 encoders.
+
+* Keyboard Maintainer: [muge](https://github.com/muge)
+* Hardware Supported: CXT Studio 12E3
+* Hardware Availability: AliExpress, Taobao
+
+Make example for this keyboard (after setting up your build environment):
+
+    make cxt_studio/12e3:default
+
+Flashing example for this keyboard:
+
+    make cxt_studio/12e3: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 (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB, located under the large encoder, on the right side
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available. It is included in the default layout