Merge remote-tracking branch 'upstream/master'

18 files changed, 282 insertions, 431 deletions

diff --git a/keyboards/lets_split/Makefile b/keyboards/lets_split/Makefile
index 4e2a6f00f..f5c87d4d6 100644
--- a/keyboards/lets_split/Makefile
+++ b/keyboards/lets_split/Makefile
@@ -1,3 +1,5 @@
+SUBPROJECT_DEFAULT = rev2
+
 ifndef MAKEFILE_INCLUDED
 	include ../../Makefile
-endif
\ No newline at end of file
+endif
diff --git a/keyboards/lets_split/config.h b/keyboards/lets_split/config.h
index 4db45ab0b..008fb0978 100644
--- a/keyboards/lets_split/config.h
+++ b/keyboards/lets_split/config.h
@@ -20,53 +20,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "config_common.h"
 
-/* USB Device descriptor parameter */
-#define VENDOR_ID       0xFEED
-#define PRODUCT_ID      0x3060
-#define DEVICE_VER      0x0001
-#define MANUFACTURER    Wootpatoot
-#define PRODUCT         Lets Split
-#define DESCRIPTION     A split keyboard for the cheap makers
-
-/* COL2ROW or ROW2COL */
-#define DIODE_DIRECTION COL2ROW
-
-/* define if matrix has ghost */
-//#define MATRIX_HAS_GHOST
-
-/* number of backlight levels */
-// #define BACKLIGHT_LEVELS 3
-
-/* Set 0 if debouncing isn't needed */
-#define DEBOUNCING_DELAY 5
-
-/* 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
-
-/* key combination for command */
-#define IS_COMMAND() ( \
-    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
-)
-
-/* 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
-
 #ifdef SUBPROJECT_rev1
     #include "rev1/config.h"
 #endif
 #ifdef SUBPROJECT_rev2
     #include "rev2/config.h"
 #endif
+#ifdef SUBPROJECT_rev2fliphalf
+	#include "../../rev2fliphalf/config.h"
+#endif
 #endif
diff --git a/keyboards/lets_split/eeprom-lefthand.eep b/keyboards/lets_split/eeprom-lefthand.eep
index a92200b12..b9666a74c 100644
--- a/keyboards/lets_split/eeprom-lefthand.eep
+++ b/keyboards/lets_split/eeprom-lefthand.eep
@@ -1,2 +1,2 @@
-:080000000000000000000001F7

+:0B0000000000000000000000000001F4

 :00000001FF

diff --git a/keyboards/lets_split/eeprom-righthand.eep b/keyboards/lets_split/eeprom-righthand.eep
index 91a683170..94cc5be7f 100644
--- a/keyboards/lets_split/eeprom-righthand.eep
+++ b/keyboards/lets_split/eeprom-righthand.eep
@@ -1,2 +1,2 @@
-:080000000000000000000000F8

+:0B0000000000000000000000000000F5

 :00000001FF

diff --git a/keyboards/lets_split/keymaps/default/keymap.c b/keyboards/lets_split/keymaps/default/keymap.c
deleted file mode 100644
index 6f1f71f5f..000000000
--- a/keyboards/lets_split/keymaps/default/keymap.c
+++ /dev/null
@@ -1,188 +0,0 @@
-#include "lets_split.h"
-#include "action_layer.h"
-#include "eeconfig.h"
-
-extern keymap_config_t keymap_config;
-
-// Each layer gets a name for readability, which is then used in the keymap matrix below.
-// The underscores don't mean anything - you can have a layer called STUFF or any other name.
-// Layer names don't all need to be of the same length, obviously, and you can also skip them
-// entirely and just use numbers.
-#define _QWERTY 0
-#define _COLEMAK 1
-#define _DVORAK 2
-#define _LOWER 3
-#define _RAISE 4
-#define _ADJUST 16
-
-enum custom_keycodes {
-  QWERTY = SAFE_RANGE,
-  COLEMAK,
-  DVORAK,
-  LOWER,
-  RAISE,
-  ADJUST,
-};
-
-// Fillers to make layering more clear
-#define _______ KC_TRNS
-#define XXXXXXX KC_NO
-
-const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
-
-/* Qwerty
- * ,-----------------------------------------------------------------------------------.
- * | Tab  |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Bksp |
- * |------+------+------+------+------+-------------+------+------+------+------+------|
- * | Esc  |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  |  "   |
- * |------+------+------+------+------+------|------+------+------+------+------+------|
- * | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |Enter |
- * |------+------+------+------+------+------+------+------+------+------+------+------|
- * |Adjust| Ctrl | Alt  | GUI  |Lower |Space |Space |Raise | Left | Down |  Up  |Right |
- * `-----------------------------------------------------------------------------------'
- */
-[_QWERTY] = KEYMAP( \
-  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_SLSH, KC_ENT , \
-  KC_LCTL, ADJUST, KC_LALT, KC_LGUI, LOWER,   KC_SPC,  MT(MOD_LSFT, KC_SPC),  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT \
-),
-
-/* Colemak
- * ,-----------------------------------------------------------------------------------.
- * | Tab  |   Q  |   W  |   F  |   P  |   G  |   J  |   L  |   U  |   Y  |   ;  | Bksp |
- * |------+------+------+------+------+-------------+------+------+------+------+------|
- * | Esc  |   A  |   R  |   S  |   T  |   D  |   H  |   N  |   E  |   I  |   O  |  "   |
- * |------+------+------+------+------+------|------+------+------+------+------+------|
- * | Shift|   Z  |   X  |   C  |   V  |   B  |   K  |   M  |   ,  |   .  |   /  |Enter |
- * |------+------+------+------+------+------+------+------+------+------+------+------|
- * |Adjust| Ctrl | Alt  | GUI  |Lower |Space |Space |Raise | Left | Down |  Up  |Right |
- * `-----------------------------------------------------------------------------------'
- */
-[_COLEMAK] = KEYMAP( \
-  KC_TAB,  KC_Q,    KC_W,    KC_F,    KC_P,    KC_G,    KC_J,    KC_L,    KC_U,    KC_Y,    KC_SCLN, KC_BSPC, \
-  KC_ESC,  KC_A,    KC_R,    KC_S,    KC_T,    KC_D,    KC_H,    KC_N,    KC_E,    KC_I,    KC_O,    KC_QUOT, \
-  KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_K,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT , \
-  ADJUST,  KC_LCTL, KC_LALT, KC_LGUI, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT \
-),
-
-/* Dvorak
- * ,-----------------------------------------------------------------------------------.
- * | Tab  |   "  |   ,  |   .  |   P  |   Y  |   F  |   G  |   C  |   R  |   L  | Bksp |
- * |------+------+------+------+------+-------------+------+------+------+------+------|
- * | Esc  |   A  |   O  |   E  |   U  |   I  |   D  |   H  |   T  |   N  |   S  |  /   |
- * |------+------+------+------+------+------|------+------+------+------+------+------|
- * | Shift|   ;  |   Q  |   J  |   K  |   X  |   B  |   M  |   W  |   V  |   Z  |Enter |
- * |------+------+------+------+------+------+------+------+------+------+------+------|
- * |Adjust| Ctrl | Alt  | GUI  |Lower |Space |Space |Raise | Left | Down |  Up  |Right |
- * `-----------------------------------------------------------------------------------'
- */
-[_DVORAK] = KEYMAP( \
-  KC_TAB,  KC_QUOT, KC_COMM, KC_DOT,  KC_P,    KC_Y,    KC_F,    KC_G,    KC_C,    KC_R,    KC_L,    KC_BSPC, \
-  KC_ESC,  KC_A,    KC_O,    KC_E,    KC_U,    KC_I,    KC_D,    KC_H,    KC_T,    KC_N,    KC_S,    KC_SLSH, \
-  KC_LSFT, KC_SCLN, KC_Q,    KC_J,    KC_K,    KC_X,    KC_B,    KC_M,    KC_W,    KC_V,    KC_Z,    KC_ENT , \
-  ADJUST,  KC_LCTL, KC_LALT, KC_LGUI, LOWER,   KC_SPC,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT \
-),
-[3] = KEYMAP( \
-  KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, _______, \
-  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE, \
-  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,S(KC_NUHS),S(KC_NUBS),_______, _______, _______, \
-  _______, _______, _______, _______, _______, KC_BSPC, MT(MOD_LSFT, KC_BSPC), _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY \
-),
-[4] = KEYMAP( \
-  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    _______, \
-  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS, \
-  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_NUHS, KC_NUBS, _______, _______, _______, \
-  _______, _______, _______, _______, _______, KC_ENT, MT(MOD_LSFT, KC_ENT), _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY \
-),
-
-/* Adjust (Lower + Raise)
- * ,-----------------------------------------------------------------------------------.
- * |      | Reset|      |      |      |      |      |      |      |      |      |  Del |
- * |------+------+------+------+------+-------------+------+------+------+------+------|
- * |      |      |      |Aud on|Audoff|AGnorm|AGswap|Qwerty|Colemk|Dvorak|      |      |
- * |------+------+------+------+------+------|------+------+------+------+------+------|
- * |      |      |      |      |      |      |      |      |      |      |      |      |
- * |------+------+------+------+------+------+------+------+------+------+------+------|
- * |      |      |      |      |      |             |      |      |      |      |      |
- * `-----------------------------------------------------------------------------------'
- */
-[_ADJUST] =  KEYMAP( \
-  _______, RESET,   _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_DEL, \
-  _______, _______, _______, AU_ON,   AU_OFF,  AG_NORM, AG_SWAP, QWERTY,  COLEMAK, DVORAK,  _______, _______, \
-  _______, RGB_TOG,RGB_MOD,RGB_HUI,RGB_HUD,RGB_SAI,RGB_SAD,RGB_VAI,RGB_VAD, _______, _______, _______, \
-  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______ \
-)
-};
-
-#ifdef AUDIO_ENABLE
-float tone_qwerty[][2]     = SONG(QWERTY_SOUND);
-float tone_dvorak[][2]     = SONG(DVORAK_SOUND);
-float tone_colemak[][2]    = SONG(COLEMAK_SOUND);
-#endif
-
-void persistant_default_layer_set(uint16_t default_layer) {
-  eeconfig_update_default_layer(default_layer);
-  default_layer_set(default_layer);
-}
-
-bool process_record_user(uint16_t keycode, keyrecord_t *record) {
-  switch (keycode) {
-    case QWERTY:
-      if (record->event.pressed) {
-        #ifdef AUDIO_ENABLE
-          PLAY_NOTE_ARRAY(tone_qwerty, false, 0);
-        #endif
-        persistant_default_layer_set(1UL<<_QWERTY);
-      }
-      return false;
-      break;
-    case COLEMAK:
-      if (record->event.pressed) {
-        #ifdef AUDIO_ENABLE
-          PLAY_NOTE_ARRAY(tone_colemak, false, 0);
-        #endif
-        persistant_default_layer_set(1UL<<_COLEMAK);
-      }
-      return false;
-      break;
-    case DVORAK:
-      if (record->event.pressed) {
-        #ifdef AUDIO_ENABLE
-          PLAY_NOTE_ARRAY(tone_dvorak, false, 0);
-        #endif
-        persistant_default_layer_set(1UL<<_DVORAK);
-      }
-      return false;
-      break;
-    case LOWER:
-      if (record->event.pressed) {
-        layer_on(_LOWER);
-        update_tri_layer(_LOWER, _RAISE, _ADJUST);
-      } else {
-        layer_off(_LOWER);
-        update_tri_layer(_LOWER, _RAISE, _ADJUST);
-      }
-      return false;
-      break;
-    case RAISE:
-      if (record->event.pressed) {
-        layer_on(_RAISE);
-        update_tri_layer(_LOWER, _RAISE, _ADJUST);
-      } else {
-        layer_off(_RAISE);
-        update_tri_layer(_LOWER, _RAISE, _ADJUST);
-      }
-      return false;
-      break;
-    case ADJUST:
-      if (record->event.pressed) {
-        layer_on(_ADJUST);
-      } else {
-        layer_off(_ADJUST);
-      }
-      return false;
-      break;
-  }
-  return true;
-}
\ No newline at end of file
diff --git a/keyboards/lets_split/keymaps/i2c/config.h b/keyboards/lets_split/keymaps/i2c/config.h
index 72e5ae66b..013542731 100644
--- a/keyboards/lets_split/keymaps/i2c/config.h
+++ b/keyboards/lets_split/keymaps/i2c/config.h
@@ -14,89 +14,18 @@ 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"
-
-/* USB Device descriptor parameter */
-#define VENDOR_ID       0xFEED
-#define PRODUCT_ID      0x3060
-#define DEVICE_VER      0x0001
-#define MANUFACTURER    Wootpatoot
-#define PRODUCT         Lets Split
-#define DESCRIPTION     A split keyboard for the cheap makers
-
-/* key matrix size */
-// Rows are doubled-up
-#define MATRIX_ROWS 8
-#define MATRIX_COLS 6
-
-// wiring of each half
-#define MATRIX_ROW_PINS { B5, B4, E6, D7 }
-#define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
-
-#define CATERINA_BOOTLOADER
-
 #define USE_I2C
 
-// Use serial if not using I2C
-#ifndef USE_I2C
-#  define USE_SERIAL
-#endif
-
+#define MASTER_LEFT
+// #define _MASTER_RIGHT
 // #define EE_HANDS
 
-#define I2C_MASTER_LEFT
-// #define I2C_MASTER_RIGHT
-
-/* COL2ROW or ROW2COL */
-#define DIODE_DIRECTION COL2ROW
-
-/* define if matrix has ghost */
-//#define MATRIX_HAS_GHOST
-
-/* number of backlight levels */
-// #define BACKLIGHT_LEVELS 3
-
-/* Set 0 if debouncing isn't needed */
-#define DEBOUNCING_DELAY 5
-
-/* 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
-
-/* key combination for command */
-#define IS_COMMAND() ( \
-    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
-)
-
-/* ws2812 RGB LED */
-#define RGB_DI_PIN D4
-#define RGBLIGHT_ANIMATIONS
-#define RGBLED_NUM 8     // Number of LEDs
-#define RGBLIGHT_HUE_STEP 10
-#define RGBLIGHT_SAT_STEP 17
-#define RGBLIGHT_VAL_STEP 17
-
-/*
- * 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
-
+#ifdef SUBPROJECT_rev1
+    #include "../../rev1/config.h"
+#endif
+#ifdef SUBPROJECT_rev2
+    #include "../../rev2/config.h"
+#endif
+#ifdef SUBPROJECT_rev2fliphalf
+	#include "../../rev2fliphalf/config.h"
 #endif
diff --git a/keyboards/lets_split/keymaps/serial/config.h b/keyboards/lets_split/keymaps/serial/config.h
index b0ad522fc..ba271d1ac 100644
--- a/keyboards/lets_split/keymaps/serial/config.h
+++ b/keyboards/lets_split/keymaps/serial/config.h
@@ -15,88 +15,20 @@ 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"
-
-/* USB Device descriptor parameter */
-#define VENDOR_ID       0xFEED
-#define PRODUCT_ID      0x3060
-#define DEVICE_VER      0x0001
-#define MANUFACTURER    Wootpatoot
-#define PRODUCT         Lets Split
-#define DESCRIPTION     A split keyboard for the cheap makers
-
-/* key matrix size */
-// Rows are doubled-up
-#define MATRIX_ROWS 8
-#define MATRIX_COLS 6
-
-// wiring of each half
-#define MATRIX_ROW_PINS { B5, B4, E6, D7 }
-#define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
-
-#define CATERINA_BOOTLOADER
-
-// #define USE_I2C
-
-// Use serial if not using I2C
-#ifndef USE_I2C
-#  define USE_SERIAL
-#endif
+#define USE_SERIAL
 
+#define MASTER_LEFT
+// #define _MASTER_RIGHT
 // #define EE_HANDS
 
-#define I2C_MASTER_LEFT
-// #define I2C_MASTER_RIGHT
-
-/* COL2ROW or ROW2COL */
-#define DIODE_DIRECTION COL2ROW
-
-/* define if matrix has ghost */
-//#define MATRIX_HAS_GHOST
-
-/* number of backlight levels */
-// #define BACKLIGHT_LEVELS 3
-
-/* Set 0 if debouncing isn't needed */
-#define DEBOUNCING_DELAY 5
-
-/* 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
-
-/* key combination for command */
-#define IS_COMMAND() ( \
-    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
-)
-
-/* ws2812 RGB LED */
-#define RGB_DI_PIN D4
-#define RGBLIGHT_ANIMATIONS
-#define RGBLED_NUM 8     // Number of LEDs
-#define RGBLIGHT_HUE_STEP 10
-#define RGBLIGHT_SAT_STEP 17
-#define RGBLIGHT_VAL_STEP 17
-
-/*
- * 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
 
+#ifdef SUBPROJECT_rev1
+    #include "../../rev1/config.h"
+#endif
+#ifdef SUBPROJECT_rev2
+    #include "../../rev2/config.h"
+#endif
+#ifdef SUBPROJECT_rev2fliphalf
+	#include "../../rev2fliphalf/config.h"
 #endif
diff --git a/keyboards/lets_split/lets_split.h b/keyboards/lets_split/lets_split.h
index 2cdfb061f..0de308c7a 100644
--- a/keyboards/lets_split/lets_split.h
+++ b/keyboards/lets_split/lets_split.h
@@ -7,6 +7,9 @@
 #ifdef SUBPROJECT_rev2
     #include "rev2.h"
 #endif
+#ifdef SUBPROJECT_rev2fliphalf
+	#include "rev2fliphalf.h"
+#endif
 
 #include "quantum.h"
 
diff --git a/keyboards/lets_split/readme.md b/keyboards/lets_split/readme.md
index 6e296737a..ecce3f415 100644
--- a/keyboards/lets_split/readme.md
+++ b/keyboards/lets_split/readme.md
@@ -6,9 +6,45 @@ This readme and most of the code are from https://github.com/ahtn/tmk_keyboard/
 Split keyboard firmware for Arduino Pro Micro or other ATmega32u4
 based boards.
 
+
+## First Time Setup
+
+Download or clone the whole firmware and navigate to the keyboards/lets_split directory. Once your dev env is setup, you'll be able to generate the default .hex using:
+
+```
+$ make rev2
+```
+
+You will see a lot of output and if everything worked correctly you will see the built hex files:
+
+```
+lets_split_rev2_serial.hex
+lets_split_rev2_i2c.hex
+```
+
+If you would like to use one of the alternative keymaps, or create your own, copy one of the existing [keymaps](keymaps/) and run make like so:
+
+
+```
+$ make rev2-YOUR_KEYMAP_NAME
+```
+
+If everything worked correctly you will see a file:
+
+```
+lets_split_rev2_YOUR_KEYMAP_NAME.hex
+```
+
+For more information on customizing keymaps, take a look at the primary documentation for [Customizing Your Keymap](/readme.md##customizing-your-keymap) in the main readme.md.
+
+### Let's split 1.0
+If you have a first generation Let's Split you will need to use the revision 1 code. To do so, use `rev1` in all your commands instead.
+
 Features
 --------
 
+For the full Quantum Mechanical Keyboard feature list, see [the parent readme.md](/readme.md).
+
 Some features supported by the firmware:
 
 * Either half can connect to the computer via USB, or both halves can be used
@@ -62,7 +98,7 @@ unnecessary in simple use cases.
 Notes on Software Configuration
 -------------------------------
 
-Configuring the firmware is similar to any other TMK project. One thing
+Configuring the firmware is similar to any other QMK project. One thing
 to note is that `MATIX_ROWS` in `config.h` is the total number of rows between
 the two halves, i.e. if your split keyboard has 4 rows in each half, then
 `MATRIX_ROWS=8`.
@@ -70,33 +106,59 @@ the two halves, i.e. if your split keyboard has 4 rows in each half, then
 Also the current implementation assumes a maximum of 8 columns, but it would
 not be very difficult to adapt it to support more if required.
 
-
 Flashing
+-------
+From the keymap directory run `make SUBPROJECT-KEYMAP-avrdude` for automatic serial port resolution and flashing.
+Example: `make rev2-serial-avrdude`
+
+
+Choosing which board to plug the USB cable into (choosing Master)
 --------
+Because the two boards are identical, the firmware has logic to differentiate the left and right board.
+
+It uses two strategies to figure things out: look at the EEPROM (memory on the chip) or looks if the current board has the usb cable.
+
+The EEPROM approach requires additional setup (flashing the eeeprom) but allows you to swap the usb cable to either side.
+
+The USB cable approach is easier to setup and if you just want the usb cable on the left board, you do not need to do anything extra.
+
+### Setting the left hand as master
+If you always plug the usb cable into the left board, nothing extra is needed as this is the default. Comment out `EE_HANDS` and comment out `I2C_MASTER_RIGHT` or `MASTER_RIGHT` if for some reason it was set.
 
+### Setting the right hand as master
+If you always plug the usb cable into the right board, add an extra flag to your `config.h`
+```
+ #define MASTER_RIGHT
+```
+
+### Setting EE_hands to use either hands as master
 If you define `EE_HANDS` in your `config.h`, you will need to set the
-EEPROM for the left and right halves. The EEPROM is used to store whether the
+EEPROM for the left and right halves.
+
+The EEPROM is used to store whether the
 half is left handed or right handed. This makes it so that the same firmware
 file will run on both hands instead of having to flash left and right handed
 versions of the firmware to each half. To flash the EEPROM file for the left
 half run:
 ```
-make eeprom-left
+avrdude -p atmega32u4 -P $(COM_PORT) -c avr109 -U eeprom:w:eeprom-lefthand.eep
+// or the equivalent in dfu-programmer
+
 ```
 and similarly for right half
 ```
-make eeprom-right
+avrdude -p atmega32u4 -P $(COM_PORT) -c avr109 -U eeprom:w:eeprom-righhand.eep
+// or the equivalent in dfu-programmer
 ```
 
-After you have flashed the EEPROM for the first time, you then need to program
-the flash memory:
-```
-make program
-```
+NOTE: replace `$(COM_PORT)` with the port of your device (e.g. `/dev/ttyACM0`)
+
+After you have flashed the EEPROM, you then need to set `EE_HANDS` in your config.h, rebuild the hex files and reflash.
+
 Note that you need to program both halves, but you have the option of using
 different keymaps for each half. You could program the left half with a QWERTY
-layout and the right half with a Colemak layout. Then if you connect the left
-half to a computer by USB the keyboard will use QWERTY and Colemak when the
+layout and the right half with a Colemak layout using bootmagic's default layout option.
+Then if you connect the left half to a computer by USB the keyboard will use QWERTY and Colemak when the
 right half is connected.
 
 
diff --git a/keyboards/lets_split/rev1/config.h b/keyboards/lets_split/rev1/config.h
index 825e5ec24..2f5bde953 100644
--- a/keyboards/lets_split/rev1/config.h
+++ b/keyboards/lets_split/rev1/config.h
@@ -25,7 +25,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define PRODUCT_ID      0x3060
 #define DEVICE_VER      0x0001
 #define MANUFACTURER    Wootpatoot
-#define PRODUCT         Lets Split
 #define PRODUCT         Lets Split v1
 #define DESCRIPTION     A split keyboard for the cheap makers
 
@@ -37,19 +36,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // wiring of each half
 #define MATRIX_ROW_PINS { B5, B4, E6, D7 }
 #define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
+// #define MATRIX_COL_PINS { B3, B1, F7, F6, F5, F4 } //uncomment this line and comment line above if you need to reverse left-to-right key order
 
-#define CATERINA_BOOTLOADER
-
-// #define USE_I2C
-// Use serial if not using I2C
-#ifndef USE_I2C
-#  define USE_SERIAL
-#endif
 
-// #define EE_HANDS
-
-#define I2C_MASTER_LEFT
-// #define I2C_MASTER_RIGHT
+#define CATERINA_BOOTLOADER
 
 /* COL2ROW or ROW2COL */
 #define DIODE_DIRECTION COL2ROW
diff --git a/keyboards/lets_split/rev2/config.h b/keyboards/lets_split/rev2/config.h
index e9689d773..b34d7c004 100644
--- a/keyboards/lets_split/rev2/config.h
+++ b/keyboards/lets_split/rev2/config.h
@@ -36,21 +36,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // wiring of each half
 #define MATRIX_ROW_PINS { D7, E6, B4, B5 }
 #define MATRIX_COL_PINS { F6, F7, B1, B3, B2, B6 }
+// #define MATRIX_COL_PINS { B6, B2, B3, B1, F7, F6 } //uncomment this line and comment line above if you need to reverse left-to-right key order
 
 #define CATERINA_BOOTLOADER
 
-// #define USE_I2C
-
-// Use serial if not using I2C
-#ifndef USE_I2C
-#  define USE_SERIAL
-#endif
-
-// #define EE_HANDS
-
-#define I2C_MASTER_LEFT
-// #define I2C_MASTER_RIGHT
-
 /* COL2ROW or ROW2COL */
 #define DIODE_DIRECTION COL2ROW
 
diff --git a/keyboards/lets_split/rev2fliphalf/Makefile b/keyboards/lets_split/rev2fliphalf/Makefile
new file mode 100644
index 000000000..4e2a6f00f
--- /dev/null
+++ b/keyboards/lets_split/rev2fliphalf/Makefile
@@ -0,0 +1,3 @@
+ifndef MAKEFILE_INCLUDED
+	include ../../Makefile
+endif
\ No newline at end of file
diff --git a/keyboards/lets_split/rev2fliphalf/config.h b/keyboards/lets_split/rev2fliphalf/config.h
new file mode 100644
index 000000000..1c45cf136
--- /dev/null
+++ b/keyboards/lets_split/rev2fliphalf/config.h
@@ -0,0 +1,91 @@
+/*
+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"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x3060
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Wootpatoot
+#define PRODUCT         Lets Split v2
+#define DESCRIPTION     A split keyboard for the cheap makers
+
+/* key matrix size */
+// Rows are doubled-up
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 6
+
+// wiring of each half
+#define MATRIX_ROW_PINS { D7, E6, B4, B5 }
+//#define MATRIX_COL_PINS { F6, F7, B1, B3, B2, B6 }
+#define MATRIX_COL_PINS { B6, B2, B3, B1, F7, F6 } //uncomment this line and comment line above if you need to reverse left-to-right key order
+
+//#define CATERINA_BOOTLOADER
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* define if matrix has ghost */
+//#define MATRIX_HAS_GHOST
+
+/* number of backlight levels */
+// #define BACKLIGHT_LEVELS 3
+
+/* Set 0 if debouncing isn't needed */
+#define DEBOUNCING_DELAY 5
+
+/* 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
+
+/* key combination for command */
+#define IS_COMMAND() ( \
+    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
+)
+
+/* ws2812 RGB LED */
+#define RGB_DI_PIN D3
+#define RGBLIGHT_TIMER
+#define RGBLED_NUM 12    // Number of LEDs
+#define ws2812_PORTREG  PORTD
+#define ws2812_DDRREG   DDRD
+
+/*
+ * 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
\ No newline at end of file
diff --git a/keyboards/lets_split/rev2fliphalf/rev2fliphalf.c b/keyboards/lets_split/rev2fliphalf/rev2fliphalf.c
new file mode 100644
index 000000000..c505d3a6e
--- /dev/null
+++ b/keyboards/lets_split/rev2fliphalf/rev2fliphalf.c
@@ -0,0 +1,32 @@
+#include "lets_split.h"
+
+#ifdef AUDIO_ENABLE
+    float tone_startup[][2] = SONG(STARTUP_SOUND);
+    float tone_goodbye[][2] = SONG(GOODBYE_SOUND);
+#endif
+
+void matrix_init_kb(void) {
+
+    #ifdef AUDIO_ENABLE
+        _delay_ms(20); // gets rid of tick
+        PLAY_NOTE_ARRAY(tone_startup, false, 0);
+    #endif
+
+    // // green led on
+    // DDRD |= (1<<5);
+    // PORTD &= ~(1<<5);
+
+    // // orange led on
+    // DDRB |= (1<<0);
+    // PORTB &= ~(1<<0);
+
+	matrix_init_user();
+};
+
+void shutdown_user(void) {
+    #ifdef AUDIO_ENABLE
+        PLAY_NOTE_ARRAY(tone_goodbye, false, 0);
+	_delay_ms(150);
+	stop_all_notes();
+    #endif
+}
diff --git a/keyboards/lets_split/rev2fliphalf/rev2fliphalf.h b/keyboards/lets_split/rev2fliphalf/rev2fliphalf.h
new file mode 100644
index 000000000..7dc8e5ba8
--- /dev/null
+++ b/keyboards/lets_split/rev2fliphalf/rev2fliphalf.h
@@ -0,0 +1,28 @@
+#ifndef REV2FLIPHALF_H
+#define REV2FLIPHALF_H
+
+#include "../lets_split.h"
+
+//void promicro_bootloader_jmp(bool program);
+#include "quantum.h"
+
+//void promicro_bootloader_jmp(bool program);
+
+#define KEYMAP( \
+	k00, k01, k02, k03, k04, k05, k40, k41, k42, k43, k44, k45, \
+	k10, k11, k12, k13, k14, k15, k50, k51, k52, k53, k54, k55, \
+	k20, k21, k22, k23, k24, k25, k60, k61, k62, k63, k64, k65, \
+	k30, k31, k32, k33, k34, k35, k70, k71, k72, k73, k74, k75 \
+	) \
+	{ \
+		{ k00, k01, k02, k03, k04, k05 }, \
+		{ k10, k11, k12, k13, k14, k15 }, \
+		{ k20, k21, k22, k23, k24, k25 }, \
+		{ k30, k31, k32, k33, k34, k35 }, \
+		{ k40, k41, k42, k43, k44, k45 }, \
+		{ k50, k51, k52, k53, k54, k55 }, \
+		{ k60, k61, k62, k63, k64, k65 }, \
+		{ k70, k71, k72, k73, k74, k75 } \
+	}
+
+#endif
\ No newline at end of file
diff --git a/keyboards/lets_split/rev2fliphalf/rules.mk b/keyboards/lets_split/rev2fliphalf/rules.mk
new file mode 100644
index 000000000..80a942d06
--- /dev/null
+++ b/keyboards/lets_split/rev2fliphalf/rules.mk
@@ -0,0 +1,5 @@
+BACKLIGHT_ENABLE = no
+
+ifndef QUANTUM_DIR
+	include ../../../Makefile
+endif
diff --git a/keyboards/lets_split/rules.mk b/keyboards/lets_split/rules.mk
index 1aee5313c..0efa78550 100644
--- a/keyboards/lets_split/rules.mk
+++ b/keyboards/lets_split/rules.mk
@@ -73,3 +73,15 @@ USE_I2C ?= yes
 SLEEP_LED_ENABLE ?= no    # Breathing sleep LED during USB suspend
 
 CUSTOM_MATRIX = yes
+
+avrdude: build
+	ls /dev/tty* > /tmp/1; \
+	echo "Reset your Pro Micro now"; \
+	while [[ -z $$USB ]]; do \
+	  sleep 1; \
+	  ls /dev/tty* > /tmp/2; \
+	  USB=`diff /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \
+	done; \
+	avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex
+
+.PHONY: avrdude
diff --git a/keyboards/lets_split/split_util.c b/keyboards/lets_split/split_util.c
index 461921798..226dc1881 100644
--- a/keyboards/lets_split/split_util.c
+++ b/keyboards/lets_split/split_util.c
@@ -21,7 +21,8 @@ static void setup_handedness(void) {
   #ifdef EE_HANDS
     isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
   #else
-    #ifdef I2C_MASTER_RIGHT
+    // I2C_MASTER_RIGHT is deprecated use MASTER_RIGHT instead since this works for both serial and i2c
+    #if defined(I2C_MASTER_RIGHT) || defined(MASTER_RIGHT)
       isLeftHand = !has_usb();
     #else
       isLeftHand = has_usb();