[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>

2 files changed, 150 insertions, 0 deletions

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