add keyboard suika27melo

keyboards/suikagiken/suika27melo/config.h

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+// Copyright 2025 @suikagiken
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+#define MIDI_ADVANCED

keyboards/suikagiken/suika27melo/keyboard.json

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+{
+    "manufacturer": "suikagiken",
+    "keyboard_name": "suika27melo",
+    "maintainer": "suikagiken",
+    "processor": "atmega32u4",
+    "bootloader": "atmel-dfu",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "midi":true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["F0", "B4", "B5", "D7", "B6", "D6", "C6", "C7", "D0"],
+        "rows": ["F1", "F4", "D1", "D2"]
+    },
+    "url": "https://github.com/suikagiken/suika27melo",
+    "usb": {
+        "device_version": "1.1.0",
+        "vid": "0x4B48",
+        "pid": "0x0201"
+    },
+    "dynamic_keymap": {
+        "layer_count": 4
+    },
+    "build": {
+        "debounce_type": "sym_eager_pk"
+    },
+    "debounce": 50,
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix":[0, 0], "x":0, "y":0},
+                {"matrix":[0, 1], "x":2, "y":0},
+                {"matrix":[0, 2], "x":3, "y":0},
+                {"matrix":[0, 4], "x":5, "y":0},
+                {"matrix":[0, 5], "x":6, "y":0},
+                {"matrix":[0, 6], "x":7, "y":0},
+                {"matrix":[2, 1], "x":9, "y":0},
+                {"matrix":[2, 2], "x":10, "y":0},
+                {"matrix":[2, 4], "x":12, "y":0},
+                {"matrix":[2, 5], "x":13, "y":0},
+                {"matrix":[2, 6], "x":14, "y":0},
+                {"matrix":[1, 0], "x":0, "y":1},
+                {"matrix":[1, 1], "x":1.5, "y":1},
+                {"matrix":[1, 2], "x":2.5, "y":1},
+                {"matrix":[1, 3], "x":3.5, "y":1},
+                {"matrix":[1, 4], "x":4.5, "y":1},
+                {"matrix":[1, 5], "x":5.5, "y":1},
+                {"matrix":[1, 6], "x":6.5, "y":1},
+                {"matrix":[1, 7], "x":7.5, "y":1},
+                {"matrix":[3, 1], "x":8.5, "y":1},
+                {"matrix":[3, 2], "x":9.5, "y":1},
+                {"matrix":[3, 3], "x":10.5, "y":1},
+                {"matrix":[3, 4], "x":11.5, "y":1},
+                {"matrix":[3, 5], "x":12.5, "y":1},
+                {"matrix":[3, 6], "x":13.5, "y":1},
+                {"matrix":[3, 7], "x":14.5, "y":1},
+                {"matrix":[3, 8], "x":15.5, "y":1}
+           ]
+        }
+    }
+}

keyboards/suikagiken/suika27melo/keymaps/default/keymap.json

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+{
+  "author": "@suikagiken",
+  "keyboard": "suikagiken/suika85ergo",
+  "keymap": "default",
+  "layout": "LAYOUT",
+  "layers": [
+    [
+        "KC_A",     "KC_D", "KC_F",         "KC_I", "KC_K", "KC_M",         "KC_P", "KC_R",         "KC_U", "KC_W", "KC_Y",  
+        "KC_B", "KC_C", "KC_E", "KC_G", "KC_H", "KC_J", "KC_L", "KC_N", "KC_O", "KC_Q", "KC_S", "KC_T", "KC_V", "KC_X", "KC_Z", "KC_SPC"  
+    ]
+  ]
+}

keyboards/suikagiken/suika27melo/keymaps/midi/keymap.json

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+{
+  "author": "@suikagiken",
+  "keyboard": "suikagiken/suika85ergo",
+  "keymap": "midi",
+  "layout": "LAYOUT",
+  "layers": [
+    [
+        "MI_OCTU",    "MI_Cs1", "MI_Ds1",        "MI_Fs1", "MI_Gs1", "MI_As1",       "MI_Cs2", "MI_Ds2",        "MI_Fs2", "MI_Gs2", "MI_As2", 
+        "MI_OCTD", "MI_C1", "MI_D1", "MI_E1", "MI_F1", "MI_G1", "MI_A1", "MI_B1", "MI_C2", "MI_D2", "MI_E2", "MI_F2", "MI_G2", "MI_A2", "MI_B2", "MI_C2"  
+    ]
+  ]
+}

keyboards/suikagiken/suika27melo/readme.md

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+# suika27melo
+(English Follows Japanese)
+
+## 概要
+![suika27melo1](https://github.com/suikagiken/suika27melo/blob/main/img/suika27melo_1.jpg)
+![suika27melo2](https://github.com/suikagiken/suika27melo/blob/main/img/suika27melo_2.jpg)
+
+suika27meloは2オクターブのピアノ鍵盤型マクロキーパッドです。
+通常のマクロキーパッドとしても使えるほか、MIDIキーボードとしてDAWソフトの入力や演奏に使用できます。
+VIA/REMAPに対応していますので、組み立て後すぐにキーアサインのカスタマイズが可能です。
+
+* 制作 : すいか技研 （Website: https://suikagiken.net GitHub: [suikagiken](https://github.com/suikagiken) ）
+* 販売 : すいか技研の[booth](https://suikagiken.booth.pm/)にて販売予定です
+
+## ビルドガイド
+
+[こちら](https://github.com/suikagiken/suika27melo/blob/main/buildguide_1.1.md)からご覧下さい。
+
+---
+
+## Overview
+
+suika27melo is a 2-octave piano shaped macro keypad.
+You can use it as a normal macro keypad, or use it as a MIDI keyboard for DAW software input and musical performance.
+It supports VIA/REMAP for changing key assignments, so it can be easily customized after assembly.
+
+* Keyboard Maintainer: [suikagiken](https://github.com/suikagiken)
+* Hardware Availability: Available at [booth](https://suikagiken.booth.pm/) soon.
+
+Make example for this keyboard (after setting up your build environment):
+
+    make suikagiken/suika27melo:default
+
+Flashing example for this keyboard:
+
+    make suikagiken/suika27melo: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 (the top left key) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
+
+