New keyboard: Cu75 (#2374)

* Added Modular keyboards L,R and NUM

Created code modules for the 3 modules of the modular keyboard.
Original idea by MechboardsUK. Uses i2c implementation similar to lets
split

* Remove modular from master

This is to fix incorrect branching

* Addition of cu75

Addition of cu75 keyboard, uses libraries from LFKeyboards directory which are path linked to reduce file duplication.

Minor fix on cu24 readme

* Minor Readme Fix

12 files changed, 803 insertions, 1 deletions

diff --git a/keyboards/cu24/readme.md b/keyboards/cu24/readme.md
index a017cd6658..4624c1aa96 100644
--- a/keyboards/cu24/readme.md
+++ b/keyboards/cu24/readme.md
@@ -6,7 +6,7 @@ A luxurious 24 key keypad with various layouts. Includes RGB underglow, backligh
 
 Keyboard Maintainer: [Yiancar](https://github.com/yiancar)  
 Hardware Supported: PCB v1.0 (uses a 32u4) 
-Hardware Availability: http://caps-unlocked.com/
+Hardware Availability: [caps-unlocked.com](http://caps-unlocked.com/)
 
 Make example for this keyboard (after setting up your build environment):
 
diff --git a/keyboards/cu75/config.h b/keyboards/cu75/config.h
new file mode 100644
index 0000000000..c21e1da017
--- /dev/null
+++ b/keyboards/cu75/config.h
@@ -0,0 +1,151 @@
+/*
+Copyright 2012 Jun Wako <wakojun@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/>.
+*/
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include "config_common.h"
+
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x6062
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    LFKeyboards/CapsUnlocked
+#define PRODUCT         CU75
+#define DESCRIPTION     A luxurious fully customisable 75%
+
+#define DIODE_DIRECTION COL2ROW
+#define MATRIX_ROWS 6
+#define MATRIX_COLS 16
+#define MATRIX_ROW_PINS {F1, B7, B3, D2, D3, B2}
+#define MATRIX_COL_PINS {F4, F5, F6, F7, C7, C6, B6, B5, B4, D7, D6, D4, D5, B1, B0, F0}
+#define UNUSED_PINS {}
+
+#define RGB_DI_PIN C7  // Have to set it to something to get the ws2812 code to compile
+#define RGBLED_NUM 24     // Number of LEDs
+#define RGBLIGHT_ANIMATIONS
+#define RGBLIGHT_HUE_STEP 10
+#define RGBLIGHT_SAT_STEP 17
+#define RGBLIGHT_VAL_STEP 17
+
+/* 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 */
+#define BACKLIGHT_LEVELS 8
+#define BACKLIGHT_PWM_MAP {8, 16, 40, 55, 70, 128, 200, 255}
+
+/* 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
+
+/*
+ * 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
+
+#endif
diff --git a/keyboards/cu75/cu75.c b/keyboards/cu75/cu75.c
new file mode 100644
index 0000000000..6dc2898454
--- /dev/null
+++ b/keyboards/cu75/cu75.c
@@ -0,0 +1,179 @@
+#include <avr/sfr_defs.h>
+#include <avr/timer_avr.h>
+#include <avr/wdt.h>
+#include "cu75.h"
+#include "keymap.h"
+#include "debug.h"
+#include "../lfkeyboards/issi.h"
+#include "../lfkeyboards/TWIlib.h"
+#include "../lfkeyboards/lighting.h"
+
+#ifdef AUDIO_ENABLE
+float test_sound[][2] = SONG(STARTUP_SOUND);
+#include <audio/audio.h>
+#endif
+
+uint16_t click_hz = CLICK_HZ;
+uint16_t click_time = CLICK_MS;
+uint8_t click_toggle = CLICK_ENABLED;
+
+
+void matrix_init_kb(void)
+{
+    // put your keyboard start-up code here
+    // runs once when the firmware starts up
+    matrix_init_user();
+
+#ifdef AUDIO_ENABLE
+    audio_init();
+    PLAY_NOTE_ARRAY(test_sound, false, STACCATO);
+    // Fix port B5
+    cbi(DDRB, 5);
+    sbi(PORTB, 5);
+#else
+    // If we're not using the audio pin, drive it low
+    sbi(DDRC, 6);
+    cbi(PORTC, 6);
+#endif
+#ifdef ISSI_ENABLE
+    issi_init();
+#endif
+}
+
+void matrix_scan_kb(void)
+{
+#ifdef WATCHDOG_ENABLE
+    wdt_reset();
+#endif
+#ifdef ISSI_ENABLE
+    // switch/underglow lighting update
+    static uint32_t issi_device = 0;
+    static uint32_t twi_last_ready = 0;
+    if(twi_last_ready > 1000){
+        // Its been way too long since the last ISSI update, reset the I2C bus and start again
+        dprintf("TWI failed to recover, TWI re-init\n");
+        twi_last_ready = 0;
+        TWIInit();
+        force_issi_refresh();
+    }
+    if(isTWIReady()){
+        twi_last_ready = 0;
+        // If the i2c bus is available, kick off the issi update, alternate between devices
+        update_issi(issi_device, issi_device);
+        if(issi_device){
+            issi_device = 0;
+        }else{
+            issi_device = 3;
+        }
+    }else{
+        twi_last_ready++;
+    }
+#endif
+    matrix_scan_user();
+}
+
+void click(uint16_t freq, uint16_t duration){
+#ifdef AUDIO_ENABLE
+    if(freq >= 100 && freq <= 20000 && duration < 100){
+        play_note(freq, 10);
+        for (uint16_t i = 0; i < duration; i++){
+            _delay_ms(1);
+        }
+        stop_all_notes();
+    }
+#endif
+}
+
+bool process_record_kb(uint16_t keycode, keyrecord_t* record)
+{
+    // Test code that turns on the switch led for the key that is pressed
+    // set_backlight_by_keymap(record->event.key.col, record->event.key.row);
+    if (click_toggle && record->event.pressed){
+        click(click_hz, click_time);
+    }
+    if (keycode == RESET) {
+        reset_keyboard_kb();
+    } else {
+    }
+    return process_record_user(keycode, record);
+}
+
+void action_function(keyrecord_t *event, uint8_t id, uint8_t opt)
+{
+#ifdef AUDIO_ENABLE
+    int8_t sign = 1;
+#endif
+    if(id == LFK_ESC_TILDE){
+        // Send ~ on shift-esc
+        void (*method)(uint8_t) = (event->event.pressed) ? &add_key : &del_key;
+        uint8_t shifted = get_mods() & (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT));
+        method(shifted ? KC_GRAVE : KC_ESCAPE);
+        send_keyboard_report();
+    }else if(event->event.pressed){
+        switch(id){
+            case LFK_SET_DEFAULT_LAYER:
+                // set/save the current base layer to eeprom, falls through to LFK_CLEAR
+                eeconfig_update_default_layer(1UL << opt);
+                default_layer_set(1UL << opt);
+            case LFK_CLEAR:
+                // Go back to default layer
+                layer_clear();
+                break;
+#ifdef AUDIO_ENABLE
+            case LFK_CLICK_FREQ_LOWER:
+                sign = -1;  // continue to next statement
+            case LFK_CLICK_FREQ_HIGHER:
+                click_hz += sign * 100;
+                click(click_hz, click_time);
+                break;
+            case LFK_CLICK_TOGGLE:
+                if(click_toggle){
+                    click_toggle = 0;
+                    click(4000, 100);
+                    click(1000, 100);
+                }else{
+                    click_toggle = 1;
+                    click(1000, 100);
+                    click(4000, 100);
+                }
+                break;
+            case LFK_CLICK_TIME_SHORTER:
+                sign = -1;  // continue to next statement
+            case LFK_CLICK_TIME_LONGER:
+                click_time += sign;
+                click(click_hz, click_time);
+                break;
+#endif
+            case LFK_DEBUG_SETTINGS:
+                dprintf("Click:\n");
+                dprintf("  toggle: %d\n", click_toggle);
+                dprintf("  freq(hz): %d\n", click_hz);
+                dprintf("  duration(ms): %d\n", click_time);
+                break;
+        }
+    }
+}
+
+void reset_keyboard_kb(){
+#ifdef WATCHDOG_ENABLE
+    MCUSR = 0;
+    wdt_disable();
+    wdt_reset();
+#endif
+    reset_keyboard();
+}
+
+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);
+}
+
+// LFK lighting info
+const uint8_t switch_matrices[] = {0, 1};
+const uint8_t rgb_matrices[] = {6, 7};
+const uint8_t rgb_sequence[] = {
+    24, 23, 22, 21, 20, 19, 18, 17, 1, 2, 3, 4, 5,
+    6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 9
+};
diff --git a/keyboards/cu75/cu75.h b/keyboards/cu75/cu75.h
new file mode 100644
index 0000000000..e4d7f2f936
--- /dev/null
+++ b/keyboards/cu75/cu75.h
@@ -0,0 +1,110 @@
+#ifndef CU75_H
+#define CU75_H
+
+/* if the kb.h file exists (because we're running from qmkbuilder) include it */
+#ifdef __has_include
+#if __has_include("kb.h")
+#include "kb.h"
+#endif
+#endif
+
+#include "quantum.h"
+#include "matrix.h"
+#include <avr/sfr_defs.h>
+
+#ifndef cbi
+#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
+#endif
+
+#ifndef sbi
+#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
+#endif
+
+
+typedef struct RGB_Color {
+    uint16_t red;
+    uint16_t green;
+    uint16_t blue;
+} RGB_Color;
+
+typedef struct Layer_Info {
+    uint32_t layer;
+    uint32_t mask;
+    RGB_Color color;
+} Layer_Info;
+
+extern const uint32_t layer_count;
+extern const Layer_Info layer_info[];
+
+enum action_functions {
+    LFK_CLEAR = 0,          // Resets all layers
+    LFK_ESC_TILDE,          // esc+lshift = ~
+    LFK_SET_DEFAULT_LAYER,  // changes and saves current base layer to eeprom
+    LFK_CLICK_TOGGLE,       // Adjusts click duration
+    LFK_CLICK_FREQ_HIGHER,  // Adjusts click frequency
+    LFK_CLICK_FREQ_LOWER,   // Adjusts click frequency
+    LFK_CLICK_TIME_LONGER,  // Adjusts click duration
+    LFK_CLICK_TIME_SHORTER, // Adjusts click duration
+    LFK_DEBUG_SETTINGS,     // prints LED and click settings to HID
+    LFK_LED_TEST            // cycles through switch and RGB LEDs
+};
+
+#define CLICK_HZ 500
+#define CLICK_MS 2
+#define CLICK_ENABLED 0
+
+void reset_keyboard_kb(void);
+void click(uint16_t freq, uint16_t duration);
+
+/* Vanilla Keymap */
+// This a shortcut to help you visually see your layout.
+/*
+* ,-------------------------------------------------------------------------------.
+* | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 0A | 0B | 0C | 0D | 0E | 0F | 0G |
+* |-------------------------------------------------------------------------------|
+* | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 1A | 1B | 1C | 1D |   1E    | 1G |
+* |-------------------------------------------------------------------------------|
+* | 21   | 22 |23 | 24 | 25 | 26 | 27 | 28 | 29 | 2A | 2B | 2C | 2D |   2E   | 2F |
+* |-------------------------------------------------------------------------------|
+* | 31    | 32 |33 | 34 | 35 | 36 | 37 | 38 | 39 | 3A | 3B | 3C |      3D    | 3F |
+* |-------------------------------------------------------------------------------|
+* | 41      | 42 |43 | 45 | 46 | 47 | 48 | 49 | 4A | 4B | 4C |    4D    | 4E | 4F |
+* |-------------------------------------------------------------------------------|
+* | 51  |  52  | 53  | 54 |         57        | 59 | 5A | 5B | 5C |  5D | 5E | 5F |
+* `-------------------------------------------------------------------------------'
+*/
+// The first section contains all of the arguements
+// The second converts the arguments into a two-dimensional array
+#define KEYMAP( \
+    k01, k02, k03, k04, k05, k06, k07, k08, k09, k0A, k0B, k0C, k0D, k0E, k0F, k0G, \
+    k11, k12, k13, k14, k15, k16, k17, k18, k19, k1A, k1B, k1C, k1D,      k1E, k1G, \
+    k21,   k22, k23, k24, k25, k26, k27, k28, k29, k2A, k2B, k2C, k2D,    k2E, k2F, \
+    k31,    k32, k33, k34, k35, k36, k37, k38, k39, k3A, k3B, k3C,        k3D, k3F, \
+    k41,     k43, k44,  k45, k46, k47, k48, k49, k4A, k4B, k4C,      k4D, k4E, k4F, \
+    k51, k52, k53,        k54,      k57,       k59,        k5A, k5B, k5C, k5D, k5E, k5F \
+) { \
+    {k01, k02,   k03, k04,   k05,   k06,   k07, k08,   k09, k0A, k0B, k0C, k0D, k0E,   k0F,   k0G}, \
+    {k11, k12,   k13, k14,   k15,   k16,   k17, k18,   k19, k1A, k1B, k1C, k1D, k1E,   KC_NO, k1G}, \
+    {k21, k22,   k23, k24,   k25,   k26,   k27, k28,   k29, k2A, k2B, k2C, k2D, k2E,   k2F,   KC_NO}, \
+    {k31, k32,   k33, k34,   k35,   k36,   k37, k38,   k39, k3A, k3B, k3C, k3D, KC_NO, k3F,   KC_NO}, \
+    {k41, KC_NO, k43, k44,   k45,   k46,   k47, k48,   k49, k4A, k4B, k4C, k4D, k4E,   k4F,   KC_NO}, \
+    {k51, k52,   k53, k54, KC_NO, KC_NO,   k57, KC_NO, k59, k5A, k5B, k5C, k5D, k5E,   k5F,   KC_NO}, \
+}
+
+#define ISO_KEYMAP( \
+    k01, k02, k03, k04, k05, k06, k07, k08, k09, k0A, k0B, k0C, k0D, k0E, k0F, k0G, \
+    k11, k12, k13, k14, k15, k16, k17, k18, k19, k1A, k1B, k1C, k1D,      k1E, k1G, \
+    k21,   k22, k23, k24, k25, k26, k27, k28, k29, k2A, k2B, k2C, k2D,    k3D, k2F, \
+    k31,    k32, k33, k34, k35, k36, k37, k38, k39, k3A, k3B, k3C,        k2E, k3F, \
+    k41, k42, k43, k44,  k45, k46, k47, k48, k49, k4A, k4B, k4C,      k4D, k4E, k4F, \
+    k51, k52, k53,        k54,      k57,       k59,        k5A, k5B, k5C, k5D, k5E, k5F \
+) { \
+    {k01, k02,   k03, k04,   k05,   k06,   k07, k08,   k09, k0A, k0B, k0C, k0D, k0E,   k0F,   k0G}, \
+    {k11, k12,   k13, k14,   k15,   k16,   k17, k18,   k19, k1A, k1B, k1C, k1D, k1E,   KC_NO, k1G}, \
+    {k21, k22,   k23, k24,   k25,   k26,   k27, k28,   k29, k2A, k2B, k2C, k2D, k2E,   k2F,   KC_NO}, \
+    {k31, k32,   k33, k34,   k35,   k36,   k37, k38,   k39, k3A, k3B, k3C, k3D, KC_NO, k3F,   KC_NO}, \
+    {k41, k42, k43, k44,   k45,   k46,   k47, k48,   k49, k4A, k4B, k4C, k4D, k4E,     k4F,   KC_NO}, \
+    {k51, k52,   k53, k54, KC_NO, KC_NO,   k57, KC_NO, k59, k5A, k5B, k5C, k5D, k5E,   k5F,   KC_NO}, \
+}
+
+#endif //CU75_H
diff --git a/keyboards/cu75/keymaps/default/config.h b/keyboards/cu75/keymaps/default/config.h
new file mode 100644
index 0000000000..8893d122e0
--- /dev/null
+++ b/keyboards/cu75/keymaps/default/config.h
@@ -0,0 +1,8 @@
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
+
+#include "../../config.h"
+
+// place overrides here
+
+#endif
diff --git a/keyboards/cu75/keymaps/default/keymap.c b/keyboards/cu75/keymaps/default/keymap.c
new file mode 100644
index 0000000000..dfd96fbd5a
--- /dev/null
+++ b/keyboards/cu75/keymaps/default/keymap.c
@@ -0,0 +1,91 @@
+#include "cu75.h"
+#include "action_layer.h"
+
+//Define a shorter 'transparent' key code to make the keymaps more compact
+#define KC_TR KC_TRNS
+
+enum keymap_layout {
+    VANILLA = 0,
+    FUNC,
+    SETTINGS,
+};
+
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+[VANILLA] = KEYMAP(
+  /* Keymap VANILLA: (Base Layer) Default Layer
+   * ,------------------------------------------------------------.----.
+   * |Esc | F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|F13|F14| F15|
+   * |------------------------------------------------------------|----|
+   * | ~  | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  0| - | = |Backspa| Ins|
+   * |------------------------------------------------------------|----|
+   * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|     \| Del|
+   * |------------------------------------------------------------|----|
+   * |CAPS    |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return |PgUp|
+   * |------------------------------------------------------------|----|
+   * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|Shift  |Up |PgDn|
+   * |-----------------------------------------------------------------|
+   * |Ctrl|Win |Alt |Space|  Space  |Space|Alt |Ctrl|Func|Lft| Dn |Rig |
+   * `-----------------------------------------------------------------'
+   */
+    KC_ESC,KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_F13, KC_F14, KC_F15,
+    KC_GRV,KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL,   KC_BSPC,  KC_INS,
+    KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSLS,  KC_DEL,
+    KC_CAPS,  KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT,      KC_ENT,  KC_PGUP,
+    KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT,   KC_UP,  KC_PGDN,
+    KC_LCTL, KC_LGUI, KC_LALT,KC_SPC, KC_SPC, KC_SPC,KC_RALT, KC_RCTL, MO(FUNC), KC_LEFT, KC_DOWN,  KC_RGHT),
+
+[FUNC] = KEYMAP(
+  /* Keymap VANILLA: Function Layer
+   * ,-------------------------------------------------------------------.
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |   |    |    |
+   * |-------------------------------------------------------------------|
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |       |     |
+   * |-------------------------------------------------------------------|
+   * |    |   |   |   |   |   |   |   |   |   |   |   |   |     | RGB_TOG|
+   * |-------------------------------------------------------------------|
+   * |       |   |   |   |   |   |   |   |   |   |   |   |RESET |RGB_MODE|
+   * |-------------------------------------------------------------------|
+   * |       |   |   |   |   |   |   |   |   |   |   |      |RGB_HUI|    |
+   * |-------------------------------------------------------------------|
+   * |    |    |    |               |    |   |   |RGB_SAD|RGB_HUD|RGB_SAI|
+   * `-------------------------------------------------------------------'
+   */
+    KC_TR,KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,
+    KC_TR,KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,  KC_TR,
+    KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,KC_TR,  RGB_TOG,
+    KC_TR,  KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,      RESET,  RGB_MOD,
+    KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, RGB_VAD, RGB_VAI, KC_TR, KC_TR, RGB_HUI,  KC_TR,
+    KC_TR, KC_TR, KC_TR,   KC_TR,      KC_TR,          KC_TR, KC_TR, KC_TR, KC_TR, RGB_SAD, RGB_HUD,  RGB_SAI),
+};
+
+const uint16_t PROGMEM fn_actions[] = {
+    ACTION_FUNCTION(LFK_CLEAR),                               // FN0 - reset layers
+    ACTION_FUNCTION(LFK_ESC_TILDE),                           // FN1 - esc+shift = ~, else escape
+  };
+
+
+const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
+{
+  // MACRODOWN only works in this function
+      switch(id) {
+      }
+    return MACRO_NONE;
+};
+
+
+void matrix_init_user(void) {
+
+}
+
+void matrix_scan_user(void) {
+
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  return true;
+}
+
+void led_set_user(uint8_t usb_led) {
+
+}
diff --git a/keyboards/cu75/keymaps/default/rules.mk b/keyboards/cu75/keymaps/default/rules.mk
new file mode 100644
index 0000000000..39f6eca8b0
--- /dev/null
+++ b/keyboards/cu75/keymaps/default/rules.mk
@@ -0,0 +1,53 @@
+# Build Options
+#   change to "no" to disable the options, or define them in the Makefile in
+#   the appropriate keymap folder that will get included automatically
+#
+
+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 = no            # Console for debug(+400)
+COMMAND_ENABLE = no            # Commands for debug and configuration
+NKRO_ENABLE = yes               # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = yes           # Disable keyboard backlight functionality
+MIDI_ENABLE = no                # MIDI controls
+AUDIO_ENABLE = no               # Audio output on port C6
+UNICODE_ENABLE = no             # Unicode
+BLUETOOTH_ENABLE = no           # Disable Bluetooth with the Adafruit EZ-Key HID
+RGBLIGHT_ENABLE = yes          	# Disable RGB underlight
+RGBLIGHT_CUSTOM_DRIVER = yes    # RGB code is implemented in lefkeyboards, not WS2812
+SLEEP_LED_ENABLE = yes          # Breathing sleep LED during USB suspend
+TAP_DANCE_ENABLE = no
+
+ISSI_ENABLE = yes               # If the I2C pullup resistors aren't install this must be disabled
+WATCHDOG_ENABLE = no           # Resets keyboard if matrix_scan isn't run every 250ms
+
+
+ifndef QUANTUM_DIR
+	include ../../../../Makefile
+endif
+
+ifeq ($(strip $(ISSI_ENABLE)), yes)
+    TMK_COMMON_DEFS += -DISSI_ENABLE
+endif
+
+ifeq ($(strip $(WATCHDOG_ENABLE)), yes)
+    TMK_COMMON_DEFS += -DWATCHDOG_ENABLE
+endif
+
+
+# # Set the LFK78 hardware version. This is defined in rules.mk, but can be overidden here if desired
+# #
+# # RevB - first public release, uses atmega32u4, has audio, ISSI matrix split between RGB and backlight
+# # RevC/D - at90usb1286, no audio, ISSI device 0 is backlight, 4 is RGB
+# #
+# # Set to B, C or D
+# LFK_REV = D
+
+# ifeq ($(LFK_REV), B)
+# 	MCU = atmega32u4
+# else
+# 	MCU = at90usb1286
+# endif
+# OPT_DEFS += -DLFK_REV_$(LFK_REV)
+# OPT_DEFS += -DUSB_PRODUCT=\"LFK_Rev$(LFK_REV)\"
diff --git a/keyboards/cu75/keymaps/iso/config.h b/keyboards/cu75/keymaps/iso/config.h
new file mode 100644
index 0000000000..8893d122e0
--- /dev/null
+++ b/keyboards/cu75/keymaps/iso/config.h
@@ -0,0 +1,8 @@
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
+
+#include "../../config.h"
+
+// place overrides here
+
+#endif
diff --git a/keyboards/cu75/keymaps/iso/keymap.c b/keyboards/cu75/keymaps/iso/keymap.c
new file mode 100644
index 0000000000..f00788e6ab
--- /dev/null
+++ b/keyboards/cu75/keymaps/iso/keymap.c
@@ -0,0 +1,91 @@
+#include "cu75.h"
+#include "action_layer.h"
+
+//Define a shorter 'transparent' key code to make the keymaps more compact
+#define KC_TR KC_TRNS
+
+enum keymap_layout {
+    VANILLA = 0,
+    FUNC,
+    SETTINGS,
+};
+
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+[VANILLA] = ISO_KEYMAP(
+  /* Keymap VANILLA: (Base Layer) Default Layer
+   * ,------------------------------------------------------------.----.
+   * |Esc | F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|F13|F14| F15|
+   * |------------------------------------------------------------|----|
+   * |  ~ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |  0| - | = |Backspa| Ins|
+   * |------------------------------------------------------------|----|
+   * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|  Ret | Del|
+   * |--------------------------------------------------------.   |----|
+   * |CAPS   |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|  # |   |PgUp|
+   * |------------------------------------------------------------|----|
+   * |Shft| \ |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|Shift | Up |PgDn|
+   * |-----------------------------------------------------------------|
+   * |Ctrl|Win |Alt |       Space         |Alt |Ctrl|Func|Lft| Dn |Rig |
+   * `-----------------------------------------------------------------'
+   */
+    KC_ESC,KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_F13,  KC_F14, KC_F15,
+    KC_GRV,KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL,  KC_BSPC,  KC_INS,
+    KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_ENT,   KC_DEL,
+    KC_CAPS,  KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT,     KC_NUHS,  KC_PGUP,
+    KC_LSFT, KC_NUBS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT,   KC_UP,  KC_PGDN,
+    KC_LCTL, KC_LGUI, KC_LALT,KC_SPC, KC_SPC, KC_SPC,KC_RALT, KC_RCTL, MO(FUNC), KC_LEFT, KC_DOWN,  KC_RGHT),
+
+[FUNC] = KEYMAP(
+  /* Keymap VANILLA: Function Layer
+   * ,-------------------------------------------------------------------.
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |   |    |    |
+   * |-------------------------------------------------------------------|
+   * |     |   |   |   |   |   |   |   |   |   |   |   |   |       |     |
+   * |-------------------------------------------------------------------|
+   * |    |   |   |   |   |   |   |   |   |   |   |   |   |     | RGB_TOG|
+   * |-------------------------------------------------------------------|
+   * |       |   |   |   |   |   |   |   |   |   |   |   |RESET |RGB_MODE|
+   * |-------------------------------------------------------------------|
+   * |       |   |   |   |   |   |   |   |   |   |   |      |RGB_HUI|    |
+   * |-------------------------------------------------------------------|
+   * |    |    |    |               |    |   |   |RGB_SAD|RGB_HUD|RGB_SAI|
+   * `-------------------------------------------------------------------'
+   */
+    KC_TR,KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,
+    KC_TR,KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,  KC_TR,
+    KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,KC_TR,  RGB_TOG,
+    KC_TR,  KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR,      RESET,  RGB_MOD,
+    KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, KC_TR, RGB_VAD, RGB_VAI, KC_TR, KC_TR, RGB_HUI,  KC_TR,
+    KC_TR, KC_TR, KC_TR,   KC_TR,      KC_TR,          KC_TR, KC_TR, KC_TR, KC_TR, RGB_SAD, RGB_HUD,  RGB_SAI),
+};
+
+const uint16_t PROGMEM fn_actions[] = {
+    ACTION_FUNCTION(LFK_CLEAR),                               // FN0 - reset layers
+    ACTION_FUNCTION(LFK_ESC_TILDE),                           // FN1 - esc+shift = ~, else escape
+  };
+
+
+const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
+{
+  // MACRODOWN only works in this function
+      switch(id) {
+      }
+    return MACRO_NONE;
+};
+
+
+void matrix_init_user(void) {
+
+}
+
+void matrix_scan_user(void) {
+
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  return true;
+}
+
+void led_set_user(uint8_t usb_led) {
+
+}
diff --git a/keyboards/cu75/keymaps/iso/rules.mk b/keyboards/cu75/keymaps/iso/rules.mk
new file mode 100644
index 0000000000..f8b4d55689
--- /dev/null
+++ b/keyboards/cu75/keymaps/iso/rules.mk
@@ -0,0 +1,53 @@
+# Build Options
+#   change to "no" to disable the options, or define them in the Makefile in
+#   the appropriate keymap folder that will get included automatically
+#
+
+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
+NKRO_ENABLE = yes               # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+# BACKLIGHT_ENABLE = no           # Disable keyboard backlight functionality
+MIDI_ENABLE = no                # MIDI controls
+AUDIO_ENABLE = no               # Audio output on port C6
+UNICODE_ENABLE = no             # Unicode
+BLUETOOTH_ENABLE = no           # Disable Bluetooth with the Adafruit EZ-Key HID
+RGBLIGHT_ENABLE = no          	# Disable RGB underlight
+RGBLIGHT_CUSTOM_DRIVER = yes    # RGB code is implemented in lefkeyboards, not WS2812
+SLEEP_LED_ENABLE = yes          # Breathing sleep LED during USB suspend
+TAP_DANCE_ENABLE = no
+
+ISSI_ENABLE = no               # If the I2C pullup resistors aren't install this must be disabled
+WATCHDOG_ENABLE = yes           # Resets keyboard if matrix_scan isn't run every 250ms
+
+
+ifndef QUANTUM_DIR
+	include ../../../../Makefile
+endif
+
+ifeq ($(strip $(ISSI_ENABLE)), yes)
+    TMK_COMMON_DEFS += -DISSI_ENABLE
+endif
+
+ifeq ($(strip $(WATCHDOG_ENABLE)), yes)
+    TMK_COMMON_DEFS += -DWATCHDOG_ENABLE
+endif
+
+
+# # Set the LFK78 hardware version. This is defined in rules.mk, but can be overidden here if desired
+# #
+# # RevB - first public release, uses atmega32u4, has audio, ISSI matrix split between RGB and backlight
+# # RevC/D - at90usb1286, no audio, ISSI device 0 is backlight, 4 is RGB
+# #
+# # Set to B, C or D
+# LFK_REV = D
+
+# ifeq ($(LFK_REV), B)
+# 	MCU = atmega32u4
+# else
+# 	MCU = at90usb1286
+# endif
+# OPT_DEFS += -DLFK_REV_$(LFK_REV)
+# OPT_DEFS += -DUSB_PRODUCT=\"LFK_Rev$(LFK_REV)\"
diff --git a/keyboards/cu75/readme.md b/keyboards/cu75/readme.md
new file mode 100644
index 0000000000..6c3029a3f2
--- /dev/null
+++ b/keyboards/cu75/readme.md
@@ -0,0 +1,17 @@
+# CU75
+
+![CU75](https://geekhack.org/index.php?action=dlattach;topic=91767.0;attach=179167;image)
+
+A luxurious 75% keyboard with various layouts. Includes RGB underglow, backlight and an aluminium, brass and nylon case.
+
+Keyboard Maintainer: [Yiancar](https://github.com/yiancar) and [LFKeyboards](https://github.com/lfkeyboards) 
+Hardware Supported: PCB v1.0 (uses a 32u4) 
+Hardware Availability: [caps-unlocked.com](http://caps-unlocked.com/)
+
+This PCB uses lighting libraries from LFKeyboards
+
+Make example for this keyboard (after setting up your build environment):
+
+    make CU75:default
+
+See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
diff --git a/keyboards/cu75/rules.mk b/keyboards/cu75/rules.mk
new file mode 100644
index 0000000000..a84343f056
--- /dev/null
+++ b/keyboards/cu75/rules.mk
@@ -0,0 +1,41 @@
+MCU = atmega32u4
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
+
+
+# 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
+
+SRC = ../lfkeyboards/TWIlib.c ../lfkeyboards/issi.c ../lfkeyboards/lighting.c
\ No newline at end of file