[Keyboard] Add support for XD004 macro keyboard (#6337)

* Add support for XD004

Also applying the following suggested edits:

Add hardware availability link in readme
Co-Authored-By: Drashna Jaelre <drashna@live.com>

Enable lite bootmagic
Co-Authored-By: Drashna Jaelre <drashna@live.com>

Remove commented out MCU
Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Add more ellaborate keymap

Correcting usage of tap_code_16 for modified key, thanks to @drashna

* Add information about bootloader type

Co-Authored-By: Drashna Jaelre <drashna@live.com>

11 files changed, 290 insertions, 0 deletions

diff --git a/keyboards/readme.md b/keyboards/readme.md
index 8b6e40721..db2a18cc9 100644
--- a/keyboards/readme.md
+++ b/keyboards/readme.md
@@ -59,5 +59,6 @@ These keyboards are part of the QMK repository, but their manufacturers are not
 * [TheVan 44](/keyboards/tv44) — A 44-key staggered keybard by Evangs.
 * [WhiteFox](/keyboards/whitefox) — A 65% keyboard designed as a partnership by matt3o, Massdrop and Input Club
 * [Vision Division](/keyboards/vision_division) — Full Size / Split Linear Keyboard by IBNobody.
+* [XD004](/keyboards/xd004) — 1x4 macro keyboard sold by KPrepublic.
 * [XD75](/keyboards/xd75) — 15x5 ortholinear keyboard by XIUDI.
 * [YMDK NP21](/keyboards/ymdk_np21) — ps2avrGB based number pad (numpad) sold by YMDK on Aliexpress. 
diff --git a/keyboards/xd004/info.json b/keyboards/xd004/info.json
new file mode 100644
index 000000000..72c15da7f
--- /dev/null
+++ b/keyboards/xd004/info.json
@@ -0,0 +1,11 @@
+{
+    "keyboard_name": "XD004", 
+    "maintainer": "", 
+    "width": 4, 
+    "height": 1, 
+    "layouts": {
+        "LAYOUT_all": {
+            "layout": [{"label":"L", "x":0, "y":0}, {"label":"O", "x":1, "y":0}, {"label":"V", "x":2, "y":0}, {"label":"E", "x":3, "y":0}]
+        }
+    }
+}
diff --git a/keyboards/xd004/keymaps/default/keymap.c b/keyboards/xd004/keymaps/default/keymap.c
new file mode 100644
index 000000000..e82ce5e97
--- /dev/null
+++ b/keyboards/xd004/keymaps/default/keymap.c
@@ -0,0 +1,13 @@
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    // 0: Base Layer
+    LAYOUT_all(KC_L, KC_O, KC_V, KC_E),
+
+};
+
+// Loop
+void matrix_scan_user(void){
+    // Empty
+};
diff --git a/keyboards/xd004/keymaps/default/readme.md b/keyboards/xd004/keymaps/default/readme.md
new file mode 100644
index 000000000..fdf07cc87
--- /dev/null
+++ b/keyboards/xd004/keymaps/default/readme.md
@@ -0,0 +1,7 @@
+# Default Keymap for XD004 PCB
+
+This keymap is not very useful, but it will validate that the board works.
+
+## Build
+
+To build the default keymap, simply run `make xd004:default`.
diff --git a/keyboards/xd004/keymaps/system_and_media/keymap.c b/keyboards/xd004/keymaps/system_and_media/keymap.c
new file mode 100644
index 000000000..740132639
--- /dev/null
+++ b/keyboards/xd004/keymaps/system_and_media/keymap.c
@@ -0,0 +1,61 @@
+#include QMK_KEYBOARD_H
+
+#define _BASE 0    // Base layer
+#define _SYSTEM 1  // System actions
+#define _VOLUME 2  // Volume actions
+
+#define SUPER_ALT_F4_TIMER 300  // Timeout on the super alt-f4 key
+
+/*
+    The idea of this is pretty simple: base layer has four action, two of which (the outermost)
+    are regular keystrokes on tap, and a momentary layer switch on hold, sending you to layers 1 and 2.
+
+    The other bit of customization here is the 'Super Alt F4' which does Alt-F4, and then Enter if tapped
+    again SUPER_ALT_F4_TIMER miliseconds after. This lets you Alt-F4 applications, and finally quickly
+    double-tap it to Alt-F4+Enter to shut down the PC.
+*/
+
+bool is_alt_f4_active = false;
+uint16_t alt_f4_timer = 0;
+
+enum custom_keycodes {  // Make sure have the awesome keycode ready
+    SUPER_ALT_F4 = SAFE_RANGE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    // 0: Base Layer
+    [_BASE] = LAYOUT_all(LT(_SYSTEM, KC_F5), C(G(KC_LEFT)), C(G(KC_RIGHT)), LT(_VOLUME, KC_F7)),
+
+    // 1: System actions
+    [_SYSTEM] = LAYOUT_all(_______, SUPER_ALT_F4, G(KC_D), G(KC_L)),
+
+    // 2: Volume actions
+    [_VOLUME] = LAYOUT_all(KC_MEDIA_NEXT_TRACK, KC_AUDIO_VOL_DOWN, KC_AUDIO_VOL_UP, _______),
+
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {  // This will do most of the grunt work with the keycodes.
+        case SUPER_ALT_F4:
+            if (record->event.pressed) {
+                if (!is_alt_f4_active) {
+                    is_alt_f4_active = true;
+                    tap_code_16(LALT(KC_F4);  // Alt-F4
+                } else {
+                    tap_code(KC_ENTER);  // Tap enter
+                }
+            } else {
+                unregister_code(KC_TAB);
+            }
+            alt_f4_timer = timer_read();
+            break;
+    }
+    return true;
+}
+
+void matrix_scan_user(void) {
+    if (is_alt_f4_active && timer_elapsed(alt_f4_timer) > SUPER_ALT_F4_TIMER) {
+        is_alt_f4_active = false;
+    }
+};
diff --git a/keyboards/xd004/keymaps/system_and_media/readme.md b/keyboards/xd004/keymaps/system_and_media/readme.md
new file mode 100644
index 000000000..0fb3c61b6
--- /dev/null
+++ b/keyboards/xd004/keymaps/system_and_media/readme.md
@@ -0,0 +1,9 @@
+# Default Keymap for XD004 PCB
+
+A somehow more useful keymap, allowing one to move across virtual desktops on Windows, etc.
+
+It also has a 'Super Alt-F4' key for Windows that, when tapped does Alt-F4, unless two consecutive taps are less than 300ms apart, in which case the second tap becomes Enter. This allows you to close all apps doing taps, and then when the System shutdown window arrives you do a second quick tap and it will type enter, thus shutting down the computer.
+
+## Build
+
+To build the keymap, simply run `make xd004:system_and_media`.
diff --git a/keyboards/xd004/readme.md b/keyboards/xd004/readme.md
new file mode 100644
index 000000000..8b32c6a48
--- /dev/null
+++ b/keyboards/xd004/readme.md
@@ -0,0 +1,16 @@
+XD004
+==
+
+4-keys board
+
+![Top View of a XD004 board](https://ae01.alicdn.com/kf/HTB1_G9IX21H3KVjSZFHq6zKppXa0/xd004-xiudi-4-Custom-Mechanical-Keyboard-4-keys-switch-leds-PCB-programmed-hot-swappable-macro-key.jpg)
+
+Keyboard Maintainer: QMK Community  
+Hardware Supported: XD004 PCB v1.0  
+Hardware Availability: [KPRepublic](https://kprepublic.com/products/xd004-xiudi-4-custom-mechanical-keyboard-4-keys-switch-leds-pcb-programmed-hot-swappable-macro-key-silver-case-micro-port)
+
+To build with a default keymap (not useful at all, have a look at other keymaps):
+
+```make xd004/v1: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/xd004/v1/config.h b/keyboards/xd004/v1/config.h
new file mode 100644
index 000000000..a141137e9
--- /dev/null
+++ b/keyboards/xd004/v1/config.h
@@ -0,0 +1,80 @@
+/*
+Copyright 2019 Sidney Bovet <sidney.bovet@gmail.com>
+
+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/>.
+*/
+
+/*
+Note: the following configuration uses 98% of the flash memory, be
+careful if you enable anything else. Also have a look at rules.mk
+where some things are disabled to save space as well.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID 0xCDCD
+#define PRODUCT_ID 0x0404
+#define DEVICE_VER 0x0001
+// Note: unsure about manufacturer
+#define MANUFACTURER XIUDI
+#define PRODUCT XD004 v1
+#define DESCRIPTION XD004 v1 Keyboard PCB
+
+/* key matrix size */
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 4
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * On this board we have direct connection: no diodes.
+ */
+#define DIRECT_PINS        \
+    {                      \
+        { D3, D0, C4, B4 } \
+    }
+#define UNUSED_PINS
+
+/* Backlight Setup */
+// Looks like each backlight LED is connected to a single output, D5 is the one furtherst away from USB port
+#define BACKLIGHT_PIN D5
+#define BACKLIGHT_LEVELS 6
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* RGB Underglow
+This will not be used, as RGBLIGHT_ENABLE is set to 'no' in rules.mk
+We do not have enough space in the flash for this at the moment, maybe
+further optimizations can be done on that side.
+*/
+#define RGB_DI_PIN C6
+#define RGBLIGHT_EFFECT_STATIC_GRADIENT
+#define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+#define RGBLED_NUM 2
+#define RGBLIGHT_HUE_STEP 10
+#define RGBLIGHT_SAT_STEP 17
+#define RGBLIGHT_VAL_STEP 17
+
+/* disable action features */
+// #define NO_ACTION_ONESHOT // 462 bytes <- this needs to be un-commented out if Link Time Optimization is disabled, otherwise file is too large
+// The two below are implicit since we use LINK_TIME_OPTIMIZATION_ENABLE (in rules.mk)
+// #define NO_ACTION_MACRO
+// #define NO_ACTION_FUNCTION
\ No newline at end of file
diff --git a/keyboards/xd004/v1/rules.mk b/keyboards/xd004/v1/rules.mk
new file mode 100644
index 000000000..ad2d732d4
--- /dev/null
+++ b/keyboards/xd004/v1/rules.mk
@@ -0,0 +1,70 @@
+# MCU name
+MCU = atmega16u2
+
+
+# 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
+
+
+# Boot Section Size in *bytes*
+#   Teensy halfKay   512
+#   Teensy++ halfKay 2048
+#   Atmel DFU loader 4096
+#   LUFA bootloader  4096
+#   USBaspLoader     2048
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
+BOOTLOADER = atmel-dfu
+
+
+# Build Options
+BOOTMAGIC_ENABLE = lite       # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes        # Audio control and System control(+450)
+CONSOLE_ENABLE = no         # Console for debug(+400)
+COMMAND_ENABLE = no         # Commands for debug and configuration
+NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+MIDI_ENABLE = no            # MIDI controls
+AUDIO_ENABLE = no           # Audio output on port C6
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+
+# Saves about 5% of space:
+LINK_TIME_OPTIMIZATION_ENABLE = yes
+
+#LAYOUTS = ortho_1x4
diff --git a/keyboards/xd004/xd004.c b/keyboards/xd004/xd004.c
new file mode 100644
index 000000000..37a1dca14
--- /dev/null
+++ b/keyboards/xd004/xd004.c
@@ -0,0 +1,7 @@
+#include "xd004.h"
+
+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/xd004/xd004.h b/keyboards/xd004/xd004.h
new file mode 100644
index 000000000..a53ad537f
--- /dev/null
+++ b/keyboards/xd004/xd004.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "quantum.h"
+//#include "led.h"
+
+/* XD60 Keymap Definition Macro */
+/*
+    +--------------------------------+
+    |   K0      K1      K2      K3   [----- USB
+    +--------------------------------+
+*/
+#define LAYOUT_all(K00, K01, K02, K03) \
+    {                                  \
+        { K00, K01, K02, K03 }         \
+    }