Keyboard: Add support for the KBD4x (#4036)

* Generate a new project for the KBD4x

* Specify the possible layouts for the KBD4x - MIT and grid

* Fill out the readme for the KBD4x

* Configure the default keymap and wiring configuration as specified on http://qmkeyboard.cn/

* Add info.json for QMK Configurator

* Enable backlight support for the KBD4x

* Standardise on LAYOUT_planck_mit/LAYOUT_ortho_4x12 layout names

* Add whitespace so the Readme will render correctly

* Disable mouse keys support for the KBD4x to make the firmware small enough

9 files changed, 594 insertions, 0 deletions

diff --git a/keyboards/kbd4x/config.h b/keyboards/kbd4x/config.h
new file mode 100644
index 000000000..b967ab8f7
--- /dev/null
+++ b/keyboards/kbd4x/config.h
@@ -0,0 +1,223 @@
+/*
+Copyright 2018 sevenseacat
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x0000
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    KBDFans
+#define PRODUCT         KBD4x
+#define DESCRIPTION     A compact 40% (12x4) ortholinear keyboard kit.
+
+/* key matrix size */
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 12
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+*/
+#define MATRIX_ROW_PINS { D0, D1, D2, D3 }
+#define MATRIX_COL_PINS { F0, F1, F4, F5, F6, F7, B3, B1, B0, D5, B7, C7 }
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL, or CUSTOM_MATRIX */
+#define DIODE_DIRECTION COL2ROW
+
+#define BACKLIGHT_PIN B6
+#define BACKLIGHT_BREATHING
+#define BACKLIGHT_LEVELS 3
+
+#define RGB_DI_PIN E2
+#ifdef RGB_DI_PIN
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 16
+#define RGBLIGHT_HUE_STEP 8
+#define RGBLIGHT_SAT_STEP 8
+#define RGBLIGHT_VAL_STEP 8
+#endif
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCING_DELAY 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
+//#define MATRIX_HAS_GHOST
+
+/* number of backlight levels */
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
+ * This is userful for the Windows task manager shortcut (ctrl+shift+esc).
+ */
+// #define GRAVE_ESC_CTRL_OVERRIDE
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+//#define FORCE_NKRO
+
+/*
+ * Magic Key Options
+ *
+ * Magic keys are hotkey commands that allow control over firmware functions of
+ * the keyboard. They are best used in combination with the HID Listen program,
+ * found here: https://www.pjrc.com/teensy/hid_listen.html
+ *
+ * The options below allow the magic key functionality to be changed. This is
+ * useful if your keyboard/keypad is missing keys and you want magic key support.
+ *
+ */
+
+/* key combination for magic key command */
+#define IS_COMMAND() ( \
+    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
+)
+
+/* control how magic key switches layers */
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS  true
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS  true
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_CUSTOM false
+
+/* override magic key keymap */
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_CUSTOM
+//#define MAGIC_KEY_HELP1          H
+//#define MAGIC_KEY_HELP2          SLASH
+//#define MAGIC_KEY_DEBUG          D
+//#define MAGIC_KEY_DEBUG_MATRIX   X
+//#define MAGIC_KEY_DEBUG_KBD      K
+//#define MAGIC_KEY_DEBUG_MOUSE    M
+//#define MAGIC_KEY_VERSION        V
+//#define MAGIC_KEY_STATUS         S
+//#define MAGIC_KEY_CONSOLE        C
+//#define MAGIC_KEY_LAYER0_ALT1    ESC
+//#define MAGIC_KEY_LAYER0_ALT2    GRAVE
+//#define MAGIC_KEY_LAYER0         0
+//#define MAGIC_KEY_LAYER1         1
+//#define MAGIC_KEY_LAYER2         2
+//#define MAGIC_KEY_LAYER3         3
+//#define MAGIC_KEY_LAYER4         4
+//#define MAGIC_KEY_LAYER5         5
+//#define MAGIC_KEY_LAYER6         6
+//#define MAGIC_KEY_LAYER7         7
+//#define MAGIC_KEY_LAYER8         8
+//#define MAGIC_KEY_LAYER9         9
+//#define MAGIC_KEY_BOOTLOADER     PAUSE
+//#define MAGIC_KEY_LOCK           CAPS
+//#define MAGIC_KEY_EEPROM         E
+//#define MAGIC_KEY_NKRO           N
+//#define MAGIC_KEY_SLEEP_LED      Z
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+//#define NO_ACTION_MACRO
+//#define NO_ACTION_FUNCTION
+
+/*
+ * MIDI options
+ */
+
+/* Prevent use of disabled MIDI features in the keymap */
+//#define MIDI_ENABLE_STRICT 1
+
+/* enable basic MIDI features:
+   - MIDI notes can be sent when in Music mode is on
+*/
+//#define MIDI_BASIC
+
+/* enable advanced MIDI features:
+   - MIDI notes can be added to the keymap
+   - Octave shift and transpose
+   - Virtual sustain, portamento, and modulation wheel
+   - etc.
+*/
+//#define MIDI_ADVANCED
+
+/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
+//#define MIDI_TONE_KEYCODE_OCTAVES 1
+
+/*
+ * HD44780 LCD Display Configuration
+ */
+/*
+#define LCD_LINES           2     //< number of visible lines of the display
+#define LCD_DISP_LENGTH    16     //< visibles characters per line of the display
+
+#define LCD_IO_MODE      1            //< 0: memory mapped mode, 1: IO port mode
+
+#if LCD_IO_MODE
+#define LCD_PORT         PORTB        //< port for the LCD lines
+#define LCD_DATA0_PORT   LCD_PORT     //< port for 4bit data bit 0
+#define LCD_DATA1_PORT   LCD_PORT     //< port for 4bit data bit 1
+#define LCD_DATA2_PORT   LCD_PORT     //< port for 4bit data bit 2
+#define LCD_DATA3_PORT   LCD_PORT     //< port for 4bit data bit 3
+#define LCD_DATA0_PIN    4            //< pin for 4bit data bit 0
+#define LCD_DATA1_PIN    5            //< pin for 4bit data bit 1
+#define LCD_DATA2_PIN    6            //< pin for 4bit data bit 2
+#define LCD_DATA3_PIN    7            //< pin for 4bit data bit 3
+#define LCD_RS_PORT      LCD_PORT     //< port for RS line
+#define LCD_RS_PIN       3            //< pin  for RS line
+#define LCD_RW_PORT      LCD_PORT     //< port for RW line
+#define LCD_RW_PIN       2            //< pin  for RW line
+#define LCD_E_PORT       LCD_PORT     //< port for Enable line
+#define LCD_E_PIN        1            //< pin  for Enable line
+#endif
+*/
diff --git a/keyboards/kbd4x/info.json b/keyboards/kbd4x/info.json
new file mode 100644
index 000000000..78d011e2c
--- /dev/null
+++ b/keyboards/kbd4x/info.json
@@ -0,0 +1,112 @@
+{
+    "keyboard_name": "kbd4x",
+    "url": "",
+    "maintainer": "qmk",
+    "width": 14,
+    "height": 4,
+    "layouts": {
+        "LAYOUT_planck_mit": {
+            "layout": [
+              {"label":"ESC", "x":0, "y":0},
+              {"label":"Q", "x":1, "y":0},
+              {"label":"W", "x":2, "y":0},
+              {"label":"E", "x":3, "y":0},
+              {"label":"R", "x":4, "y":0},
+              {"label":"T", "x":5, "y":0},
+              {"label":"Y", "x":6, "y":0},
+              {"label":"U", "x":7, "y":0},
+              {"label":"I", "x":8, "y":0},
+              {"label":"O", "x":9, "y":0},
+              {"label":"P", "x":10, "y":0},
+              {"label":"BKSP", "x":11, "y":0},
+              {"label":"TAB", "x":0, "y":1},
+              {"label":"A", "x":1, "y":1},
+              {"label":"S", "x":2, "y":1},
+              {"label":"D", "x":3, "y":1},
+              {"label":"F", "x":4, "y":1},
+              {"label":"G", "x":5, "y":1},
+              {"label":"H", "x":6, "y":1},
+              {"label":"J", "x":7, "y":1},
+              {"label":"K", "x":8, "y":1},
+              {"label":"L", "x":9, "y":1},
+              {"label":";", "x":10, "y":1},
+              {"label":"'", "x":11, "y":1},
+              {"label":"SHIFT", "x":0, "y":2},
+              {"label":"Z", "x":1, "y":2},
+              {"label":"X", "x":2, "y":2},
+              {"label":"C", "x":3, "y":2},
+              {"label":"V", "x":4, "y":2},
+              {"label":"B", "x":5, "y":2},
+              {"label":"N", "x":6, "y":2},
+              {"label":"M", "x":7, "y":2},
+              {"label":",", "x":8, "y":2},
+              {"label":".", "x":9, "y":2},
+              {"label":"UP", "x":10, "y":2},
+              {"label":"ENTER", "x":11, "y":2},
+              {"label":"LCTRL", "x":0, "y":3},
+              {"label":"LGUI", "x":1, "y":3},
+              {"label":"1", "x":2, "y":3},
+              {"label":"2", "x":3, "y":3},
+              {"label":"3", "x":4, "y":3},
+              {"label":"SPACE", "x":5, "y":3, "w":2},
+              {"label":"MO(1)", "x":7, "y":3},
+              {"label":"/", "x":8, "y":3},
+              {"label":"LEFT", "x":9, "y":3},
+              {"label":"DOWN", "x":10, "y":3},
+              {"label":"RIGHT", "x":11, "y":3},
+            ]
+        },
+        "LAYOUT_ortho_4x12": {
+            "layout": [
+              {"label":"ESC", "x":0, "y":0},
+              {"label":"Q", "x":1, "y":0},
+              {"label":"W", "x":2, "y":0},
+              {"label":"E", "x":3, "y":0},
+              {"label":"R", "x":4, "y":0},
+              {"label":"T", "x":5, "y":0},
+              {"label":"Y", "x":6, "y":0},
+              {"label":"U", "x":7, "y":0},
+              {"label":"I", "x":8, "y":0},
+              {"label":"O", "x":9, "y":0},
+              {"label":"P", "x":10, "y":0},
+              {"label":"BKSP", "x":11, "y":0},
+              {"label":"TAB", "x":0, "y":1},
+              {"label":"A", "x":1, "y":1},
+              {"label":"S", "x":2, "y":1},
+              {"label":"D", "x":3, "y":1},
+              {"label":"F", "x":4, "y":1},
+              {"label":"G", "x":5, "y":1},
+              {"label":"H", "x":6, "y":1},
+              {"label":"J", "x":7, "y":1},
+              {"label":"K", "x":8, "y":1},
+              {"label":"L", "x":9, "y":1},
+              {"label":";", "x":10, "y":1},
+              {"label":"'", "x":11, "y":1},
+              {"label":"SHIFT", "x":0, "y":2},
+              {"label":"Z", "x":1, "y":2},
+              {"label":"X", "x":2, "y":2},
+              {"label":"C", "x":3, "y":2},
+              {"label":"V", "x":4, "y":2},
+              {"label":"B", "x":5, "y":2},
+              {"label":"N", "x":6, "y":2},
+              {"label":"M", "x":7, "y":2},
+              {"label":",", "x":8, "y":2},
+              {"label":".", "x":9, "y":2},
+              {"label":"UP", "x":10, "y":2},
+              {"label":"ENTER", "x":11, "y":2},
+              {"label":"LCTRL", "x":0, "y":3},
+              {"label":"LGUI", "x":1, "y":3},
+              {"label":"1", "x":2, "y":3},
+              {"label":"2", "x":3, "y":3},
+              {"label":"3", "x":4, "y":3},
+              {"label":"SPACE", "x":5, "y":3},
+              {"label":"MO(2)", "x":6, "y":3},
+              {"label":"MO(1)", "x":7, "y":3},
+              {"label":"/", "x":8, "y":3},
+              {"label":"LEFT", "x":9, "y":3},
+              {"label":"DOWN", "x":10, "y":3},
+              {"label":"RIGHT", "x":11, "y":3},
+            ]
+        }
+    }
+}
diff --git a/keyboards/kbd4x/kbd4x.c b/keyboards/kbd4x/kbd4x.c
new file mode 100644
index 000000000..84ada250d
--- /dev/null
+++ b/keyboards/kbd4x/kbd4x.c
@@ -0,0 +1,43 @@
+/* Copyright 2018 sevenseacat
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "kbd4x.h"
+
+void matrix_init_kb(void) {
+	// put your keyboard start-up code here
+	// runs once when the firmware starts up
+
+	matrix_init_user();
+}
+
+void matrix_scan_kb(void) {
+	// put your looping keyboard code here
+	// runs every cycle (a lot)
+
+	matrix_scan_user();
+}
+
+bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
+	// put your per-action keyboard code here
+	// runs for every action, just before processing by the firmware
+
+	return process_record_user(keycode, record);
+}
+
+void led_set_kb(uint8_t usb_led) {
+	// put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
+
+	led_set_user(usb_led);
+}
diff --git a/keyboards/kbd4x/kbd4x.h b/keyboards/kbd4x/kbd4x.h
new file mode 100644
index 000000000..d7a851e3e
--- /dev/null
+++ b/keyboards/kbd4x/kbd4x.h
@@ -0,0 +1,48 @@
+/* Copyright 2018 sevenseacat
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef KBD4X_H
+#define KBD4X_H
+
+#include "quantum.h"
+
+#define LAYOUT_planck_mit( \
+	k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, k0a, k0b, \
+	k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, k1a, k1b, \
+	k20, k21, k22, k23, k24, k25, k26, k27, k28, k29, k2a, k2b, \
+	k30, k31, k32, k33, k34,    k35,   k37, k38, k39, k3a, k3b \
+) \
+{ \
+	{ k00, k01, k02, k03, k04, k05, k06,   k07, k08, k09, k0a, k0b }, \
+	{ k10, k11, k12, k13, k14, k15, k16,   k17, k18, k19, k1a, k1b }, \
+	{ k20, k21, k22, k23, k24, k25, k26,   k27, k28, k29, k2a, k2b }, \
+	{ k30, k31, k32, k33, k34, k35, KC_NO, k37, k38, k39, k3a, k3b } \
+}
+
+// The PCB does support a grid layout, but the case does not.
+#define LAYOUT_ortho_4x12( \
+	k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, k0a, k0b, \
+	k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, k1a, k1b, \
+	k20, k21, k22, k23, k24, k25, k26, k27, k28, k29, k2a, k2b, \
+	k30, k31, k32, k33, k34, k35, k36, k37, k38, k39, k3a, k3b \
+) \
+{ \
+	{ k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, k0a, k0b }, \
+	{ k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, k1a, k1b }, \
+	{ k20, k21, k22, k23, k24, k25, k26, k27, k28, k29, k2a, k2b }, \
+	{ k30, k31, k32, k33, k34, k35, k36, k37, k38, k39, k3a, k3b } \
+}
+
+#endif
diff --git a/keyboards/kbd4x/keymaps/default/config.h b/keyboards/kbd4x/keymaps/default/config.h
new file mode 100644
index 000000000..7f3bd7dd5
--- /dev/null
+++ b/keyboards/kbd4x/keymaps/default/config.h
@@ -0,0 +1,19 @@
+/* Copyright 2018 sevenseacat
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+// place overrides here
diff --git a/keyboards/kbd4x/keymaps/default/keymap.c b/keyboards/kbd4x/keymaps/default/keymap.c
new file mode 100644
index 000000000..ad49b3799
--- /dev/null
+++ b/keyboards/kbd4x/keymaps/default/keymap.c
@@ -0,0 +1,52 @@
+/* Copyright 2018 sevenseacat
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+#define ___ KC_TRNS
+
+// Defines the keycodes used by our macros in process_record_user
+enum custom_keycodes {
+  KBD4X = SAFE_RANGE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT_planck_mit(
+    KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,     KC_Y,   KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
+    KC_TAB,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,     KC_H,   KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
+    KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,     KC_N,   KC_M,    KC_COMM, KC_DOT,  KC_UP,   KC_ENTER,
+    KC_LCTL, KC_LGUI, KC_1,    KC_2,    KC_3,    KC_SPACE,         MO(1),   KC_SLSH, KC_LEFT, KC_DOWN, KC_RIGHT
+  ),
+
+  [1] = LAYOUT_planck_mit(
+    KC_GRAVE, KC_1,    KC_2,    KC_3,    KC_4,    KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, ___,
+    ___,      RGB_TOG, RGB_MOD, RGB_HUI, RGB_HUD, ___,  ___,  ___,  ___,  ___,  ___,  RESET,
+    ___,      BL_TOGG, BL_STEP, ___,     ___,     ___,  ___,  ___,  ___,  ___,  ___,  ___,
+    ___,      ___,     ___,     ___,     ___,     ___,        ___,  ___,  ___,  ___,  ___
+  ),
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  return true;
+}
+
+void matrix_init_user(void) {
+}
+
+void matrix_scan_user(void) {
+}
+
+void led_set_user(uint8_t usb_led) {
+}
diff --git a/keyboards/kbd4x/keymaps/default/readme.md b/keyboards/kbd4x/keymaps/default/readme.md
new file mode 100644
index 000000000..a950a25ac
--- /dev/null
+++ b/keyboards/kbd4x/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for kbd4x
diff --git a/keyboards/kbd4x/readme.md b/keyboards/kbd4x/readme.md
new file mode 100644
index 000000000..42dc45024
--- /dev/null
+++ b/keyboards/kbd4x/readme.md
@@ -0,0 +1,15 @@
+# KBD4x
+
+![KBD4x](https://cdn.shopify.com/s/files/1/1473/3902/products/1_ef8d3ad0-fc70-4d4f-9e36-8438c781a581_1800x1800.jpg)
+
+A compact 40% (12x4) ortholinear keyboard kit sold by KBDFans.
+
+Keyboard Maintainer: ![sevenseacat](https://github.com/sevenseacat)  
+Hardware Supported: KBD4x PCB  
+Hardware Availability: https://kbdfans.cn/collections/diy-kit/products/kbd4x-custom-mechanical-keyboard-hot-swap-diy-kit
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kbd4x:default
+
+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).
diff --git a/keyboards/kbd4x/rules.mk b/keyboards/kbd4x/rules.mk
new file mode 100644
index 000000000..6cfd92bc6
--- /dev/null
+++ b/keyboards/kbd4x/rules.mk
@@ -0,0 +1,81 @@
+# MCU name
+#MCU = at90usb1286
+MCU = atmega32u4
+
+# Processor frequency.
+#     This will define a symbol, F_CPU, in all source code files equal to the
+#     processor frequency in Hz. You can then use this symbol in your source code to
+#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done
+#     automatically to create a 32-bit value in your source code.
+#
+#     This will be an integer division of F_USB below, as it is sourced by
+#     F_USB after it has run through any CPU prescalers. Note that this value
+#     does not *change* the processor frequency - it should merely be updated to
+#     reflect the processor speed set externally so that the code can use accurate
+#     software delays.
+F_CPU = 16000000
+
+
+#
+# LUFA specific
+#
+# Target architecture (see library "Board Types" documentation).
+ARCH = AVR8
+
+# Input clock frequency.
+#     This will define a symbol, F_USB, in all source code files equal to the
+#     input clock frequency (before any prescaling is performed) in Hz. This value may
+#     differ from F_CPU if prescaling is used on the latter, and is required as the
+#     raw input clock is fed directly to the PLL sections of the AVR for high speed
+#     clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
+#     at the end, this will be done automatically to create a 32-bit value in your
+#     source code.
+#
+#     If no clock division is performed on the input clock inside the AVR (via the
+#     CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
+F_USB = $(F_CPU)
+
+# Interrupt driven control endpoint task(+60)
+OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
+
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   atmega32a    bootloadHID
+BOOTLOADER = atmel-dfu
+
+
+# If you don't know the bootloader type, then you can specify the
+# Boot Section Size in *bytes* by uncommenting out the OPT_DEFS line
+#   Teensy halfKay      512
+#   Teensy++ halfKay    1024
+#   Atmel DFU loader    4096
+#   LUFA bootloader     4096
+#   USBaspLoader        2048
+# OPT_DEFS += -DBOOTLOADER_SIZE=4096
+
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no      # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
+CONSOLE_ENABLE = yes        # Console for debug(+400)
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality on B7 by default
+RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
+MIDI_ENABLE = no            # MIDI support (+2400 to 4200, depending on config)
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no 		# Enable support for HD44780 based LCDs (+400)