[Keyboard] Convert Corne Keyboard to Split Common (#6001)

* [Keyboard] Convert Corne Keyboard to Split Common

* Add VIA Support

* Makes sure that ol(e)d and new OLED implementation can't coexist

* Add licensing header to files

* Add changes based on feedback from foostan

* Fixes

41 files changed, 1359 insertions, 132 deletions

diff --git a/keyboards/crkbd/config.h b/keyboards/crkbd/config.h
index fb1cdf3962..a2dd710714 100644
--- a/keyboards/crkbd/config.h
+++ b/keyboards/crkbd/config.h
@@ -1,6 +1,6 @@
 /*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-Copyright 2015 Jack Humbert
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
 
 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
@@ -19,9 +19,55 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #pragma once
 
 #include "config_common.h"
-#include <serial_config.h>
 
-#define USE_I2C
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0x4653
+#define PRODUCT_ID      0x0001
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    foostan
+
+/* key matrix size */
+// Rows are doubled-up
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 6
+#define MATRIX_ROW_PINS { D4, C6, D7, E6 }
+
+// wiring of each half
+#define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
+// #define MATRIX_COL_PINS { B2, B3, B1, F7, F6, F5, F4 } //uncomment this line and comment line above if you need to reverse left-to-right key order
+
+/* 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 DEBOUNCE 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
+
+
+/*
+ * 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
 #define USE_SERIAL
 
 #define NO_ACTION_MACRO
diff --git a/keyboards/crkbd/crkbd.c b/keyboards/crkbd/crkbd.c
index 7417ad6047..af0ef8a345 100644
--- a/keyboards/crkbd/crkbd.c
+++ b/keyboards/crkbd/crkbd.c
@@ -1,9 +1,19 @@
-#include "crkbd.h"
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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.
 
-bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
-#ifdef SSD1306OLED
-  return process_record_gfx(keycode,record) && process_record_user(keycode, record);
-#else
-  return process_record_user(keycode, record);
-#endif
-}
+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 "crkbd.h"
diff --git a/keyboards/crkbd/crkbd.h b/keyboards/crkbd/crkbd.h
index 73f2a3f074..4ba9397043 100644
--- a/keyboards/crkbd/crkbd.h
+++ b/keyboards/crkbd/crkbd.h
@@ -1,5 +1,24 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
 
 #ifdef KEYBOARD_crkbd_rev1
-  #include "rev1.h"
+#    include "rev1.h"
 #endif
+
+#include "quantum.h"
diff --git a/keyboards/crkbd/keymaps/default/keymap.c b/keyboards/crkbd/keymaps/default/keymap.c
index 4dd0be8992..a3a9d95351 100644
--- a/keyboards/crkbd/keymaps/default/keymap.c
+++ b/keyboards/crkbd/keymaps/default/keymap.c
@@ -1,3 +1,21 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
 
 
diff --git a/keyboards/crkbd/keymaps/oled_sample/config.h b/keyboards/crkbd/keymaps/oled_sample/config.h
new file mode 100644
index 0000000000..41568c5916
--- /dev/null
+++ b/keyboards/crkbd/keymaps/oled_sample/config.h
@@ -0,0 +1,48 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+//#define USE_MATRIX_I2C
+#ifdef KEYBOARD_crkbd_rev1_common
+#    undef USE_I2C
+#    define USE_SERIAL
+#endif
+
+/* Select hand configuration */
+
+#define MASTER_LEFT
+// #define MASTER_RIGHT
+// #define EE_HANDS
+
+#define USE_SERIAL_PD2
+
+#define TAPPING_FORCE_HOLD
+#define TAPPING_TERM 100
+
+#undef RGBLED_NUM
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 27
+#define RGBLIGHT_LIMIT_VAL 120
+#define RGBLIGHT_HUE_STEP 10
+#define RGBLIGHT_SAT_STEP 17
+#define RGBLIGHT_VAL_STEP 17
+
+#define OLED_FONT_H "keyboards/crkbd/lib/glcdfont.c"
diff --git a/keyboards/crkbd/keymaps/oled_sample/keymap.c b/keyboards/crkbd/keymaps/oled_sample/keymap.c
new file mode 100644
index 0000000000..f2d5770b63
--- /dev/null
+++ b/keyboards/crkbd/keymaps/oled_sample/keymap.c
@@ -0,0 +1,208 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+
+// 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.
+enum crkbd_layers {
+    _QWERTY,
+    _LOWER,
+    _RAISE,
+    _ADJUST,
+};
+
+
+#define RAISE MO(_RAISE)
+#define LOWER MO(_LOWER)
+#define CTLTB CTL_T(KC_TAB)
+#define GUIEI GUI_T(KC_LANG2)
+#define ALTKN ALT_T(KC_LANG1)
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_QWERTY] = LAYOUT(
+    KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,     KC_T,                      KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
+    CTLTB,   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_RSFT,
+                                        GUIEI,    LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
+  ),
+
+  [_LOWER] = LAYOUT(
+    KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,     KC_5,                      KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC,
+    CTLTB,   KC_F1,   KC_F2,   KC_F3,   KC_F4,    KC_F5,                     KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  XXXXXXX,
+    KC_LSFT, KC_F11,  KC_F12,  KC_F13,  KC_F14,   KC_F15,                    KC_F16,  KC_F17,  KC_F18,  KC_F19,  KC_F20,  XXXXXXX,
+                                        GUIEI,    LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
+  ),
+
+  [_RAISE] = LAYOUT(
+    KC_ESC,  KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC,                   KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC,
+    CTLTB,   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                   KC_MINS, KC_EQL,  KC_LCBR, KC_RCBR, KC_PIPE, KC_GRV,
+    KC_LSFT, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                   KC_UNDS, KC_PLUS, KC_LBRC, KC_RBRC, KC_BSLS, KC_TILD,
+                                        GUIEI,   LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
+
+  ),
+
+  [_ADJUST] = LAYOUT(
+    RESET,   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+    RGB_TOG, RGB_HUI, RGB_SAI, RGB_VAI, XXXXXXX, XXXXXXX,                   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+    RGB_MOD, RGB_HUD, RGB_SAD, RGB_VAD, XXXXXXX, XXXXXXX,                   XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+                                        GUIEI,   LOWER,   KC_SPC,  KC_ENT,  RAISE,   ALTKN
+  )
+};
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+    state = update_tri_layer_state(state, _RAISE, _LOWER, _ADJUST);
+    return state;
+}
+
+
+#ifdef OLED_DRIVER_ENABLE
+oled_rotation_t oled_init_user(oled_rotation_t rotation) {
+    if (is_keyboard_master()) {
+        return OLED_ROTATION_270;
+    } else {
+        return rotation;
+    }
+}
+
+void render_crkbd_logo(void) {
+    static const char PROGMEM crkbd_logo[] = {
+        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94,
+        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4,
+        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4,
+        0};
+    oled_write_P(crkbd_logo, false);
+}
+
+#    define KEYLOG_LEN 5
+char     keylog_str[KEYLOG_LEN] = {};
+uint8_t  keylogs_str_idx        = 0;
+uint16_t log_timer              = 0;
+
+const char code_to_name[60] = {
+    ' ', ' ', ' ', ' ', 'a', 'b', 'c', 'd', 'e', 'f',
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
+    'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
+    'R', 'E', 'B', 'T', '_', '-', '=', '[', ']', '\\',
+    '#', ';', '\'', '`', ',', '.', '/', ' ', ' ', ' '};
+
+void add_keylog(uint16_t keycode) {
+    if ((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) || (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX)) {
+        keycode = keycode & 0xFF;
+    }
+
+    for (uint8_t i = KEYLOG_LEN - 1; i > 0; i--) {
+        keylog_str[i] = keylog_str[i - 1];
+    }
+    if (keycode < 60) {
+        keylog_str[0] = code_to_name[keycode];
+    }
+    keylog_str[KEYLOG_LEN - 1] = 0;
+
+    log_timer = timer_read();
+}
+
+void update_log(void) {
+    if (timer_elapsed(log_timer) > 750) {
+        add_keylog(0);
+    }
+}
+
+void render_keylogger_status(void) {
+    oled_write_P(PSTR("KLogr"), false);
+    oled_write(keylog_str, false);
+}
+
+void render_default_layer_state(void) {
+    oled_write_P(PSTR("Lyout"), false);
+    switch (get_highest_layer(default_layer_state)) {
+        case _QWERTY:
+            oled_write_P(PSTR(" QRTY"), false);
+            break;
+    }
+}
+
+void render_layer_state(void) {
+    oled_write_P(PSTR("LAYER"), false);
+    oled_write_P(PSTR("Lower"), layer_state_is(_LOWER));
+    oled_write_P(PSTR("Raise"), layer_state_is(_RAISE));
+}
+
+void render_keylock_status(uint8_t led_usb_state) {
+    oled_write_P(PSTR("Lock:"), false);
+    oled_write_P(PSTR(" "), false);
+    oled_write_P(PSTR("N"), led_usb_state & (1 << USB_LED_NUM_LOCK));
+    oled_write_P(PSTR("C"), led_usb_state & (1 << USB_LED_CAPS_LOCK));
+    oled_write_ln_P(PSTR("S"), led_usb_state & (1 << USB_LED_SCROLL_LOCK));
+}
+
+void render_mod_status(uint8_t modifiers) {
+    oled_write_P(PSTR("Mods:"), false);
+    oled_write_P(PSTR(" "), false);
+    oled_write_P(PSTR("S"), (modifiers & MOD_MASK_SHIFT));
+    oled_write_P(PSTR("C"), (modifiers & MOD_MASK_CTRL));
+    oled_write_P(PSTR("A"), (modifiers & MOD_MASK_ALT));
+    oled_write_P(PSTR("G"), (modifiers & MOD_MASK_GUI));
+}
+
+void render_bootmagic_status(void) {
+    /* Show Ctrl-Gui Swap options */
+    static const char PROGMEM logo[][2][3] = {
+        {{0x97, 0x98, 0}, {0xb7, 0xb8, 0}},
+        {{0x95, 0x96, 0}, {0xb5, 0xb6, 0}},
+    };
+    oled_write_P(PSTR("BTMGK"), false);
+    oled_write_P(PSTR(" "), false);
+    oled_write_P(logo[0][0], !keymap_config.swap_lctl_lgui);
+    oled_write_P(logo[1][0], keymap_config.swap_lctl_lgui);
+    oled_write_P(PSTR(" "), false);
+    oled_write_P(logo[0][1], !keymap_config.swap_lctl_lgui);
+    oled_write_P(logo[1][1], keymap_config.swap_lctl_lgui);
+    oled_write_P(PSTR(" NKRO"), keymap_config.nkro);
+}
+
+void render_status_main(void) {
+    /* Show Keyboard Layout  */
+    render_default_layer_state();
+    render_keylock_status(host_keyboard_leds());
+    render_mod_status(get_mods());
+    render_bootmagic_status();
+
+    render_keylogger_status();
+}
+
+void oled_task_user(void) {
+    update_log();
+    if (is_master) {
+        render_status_main();  // Renders the current keyboard state (layer, lock, caps, scroll, etc)
+    } else {
+        render_crkbd_logo();
+    }
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (record->event.pressed) {
+        add_keylog(keycode);
+    }
+    return true;
+}
+#endif
diff --git a/keyboards/crkbd/keymaps/oled_sample/rules.mk b/keyboards/crkbd/keymaps/oled_sample/rules.mk
new file mode 100644
index 0000000000..fb480bba88
--- /dev/null
+++ b/keyboards/crkbd/keymaps/oled_sample/rules.mk
@@ -0,0 +1,7 @@
+
+# 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
+#
+RGBLIGHT_ENABLE = yes       # Enable WS2812 RGB underlight.
+OLED_DRIVER_ENABLE = yes
diff --git a/keyboards/crkbd/rev1/common/common.c b/keyboards/crkbd/rev1/common/common.c
new file mode 100644
index 0000000000..5ea7347de8
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/common.c
@@ -0,0 +1,21 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 "common.h"
+
+uint8_t is_master;
diff --git a/keyboards/crkbd/rev1/common/common.h b/keyboards/crkbd/rev1/common/common.h
new file mode 100644
index 0000000000..af1795f480
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/common.h
@@ -0,0 +1,24 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 "rev1.h"
+
+#define has_usb() is_keyboard_master()
+extern uint8_t is_master;
diff --git a/keyboards/crkbd/rev1/common/config.h b/keyboards/crkbd/rev1/common/config.h
new file mode 100644
index 0000000000..12f5f75766
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/config.h
@@ -0,0 +1,30 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+#define PRODUCT         Corne Keyboard Rev.1 (Split Common)
+
+#define USE_SERIAL
+#define SOFT_SERIAL_PIN D2
+
+#ifdef RGB_MATRIX_ENABLE
+#    define RGB_MATRIX_SPLIT { 27, 27 }
+#endif
+
+#define DIODE_DIRECTION COL2ROW
diff --git a/keyboards/crkbd/rev1/common/keymaps/via/config.h b/keyboards/crkbd/rev1/common/keymaps/via/config.h
new file mode 100644
index 0000000000..aa2d45e56d
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/keymaps/via/config.h
@@ -0,0 +1,46 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+//#define USE_MATRIX_I2C
+#ifdef KEYBOARD_crkbd_rev1_legacy
+#    undef USE_I2C
+#    define USE_SERIAL
+#endif
+
+/* Select hand configuration */
+
+#define MASTER_LEFT
+// #define MASTER_RIGHT
+// #define EE_HANDS
+
+#define USE_SERIAL_PD2
+
+
+#undef RGBLED_NUM
+#define RGBLIGHT_ANIMATIONS
+#define RGBLED_NUM 27
+#define RGBLIGHT_LIMIT_VAL 120
+#define RGBLIGHT_HUE_STEP 10
+#define RGBLIGHT_SAT_STEP 17
+#define RGBLIGHT_VAL_STEP 17
+
+#define OLED_FONT_H "keyboards/crkbd/lib/glcdfont.c"
diff --git a/keyboards/crkbd/rev1/common/keymaps/via/keymap.c b/keyboards/crkbd/rev1/common/keymaps/via/keymap.c
new file mode 100644
index 0000000000..a3b2e52ce5
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/keymaps/via/keymap.c
@@ -0,0 +1,193 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT_split_3x6_3( \
+  //,-----------------------------------------------------.                    ,-----------------------------------------------------.
+       KC_TAB,    KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,                         KC_Y,    KC_U,    KC_I,    KC_O,   KC_P,  KC_BSPC,
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      KC_LCTL,    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_ESC,
+  //|--------+--------+--------+--------+--------+--------+--------|  |--------+--------+--------+--------+--------+--------+--------|
+                                          KC_LGUI, FN_MO13,  KC_SPC,     KC_ENT, FN_MO23, KC_RALT
+                                      //`--------------------------'  `--------------------------'
+
+  ),
+
+  [1] = LAYOUT_split_3x6_3( \
+  //,-----------------------------------------------------.                    ,-----------------------------------------------------.
+       KC_TAB,    KC_1,    KC_2,    KC_3,    KC_4,    KC_5,                         KC_6,    KC_7,    KC_8,    KC_9,    KC_0, KC_BSPC,
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      KC_LCTL, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                      KC_LEFT, KC_DOWN,   KC_UP,KC_RIGHT, XXXXXXX, XXXXXXX,
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      KC_LSFT, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+  //|--------+--------+--------+--------+--------+--------+--------|  |--------+--------+--------+--------+--------+--------+--------|
+                                          KC_LGUI, _______,  KC_SPC,     KC_ENT, _______, KC_RALT\
+                                      //`--------------------------'  `--------------------------'
+  ),
+
+  [2] = LAYOUT_split_3x6_3( \
+  //,-----------------------------------------------------.                    ,-----------------------------------------------------.
+       KC_TAB, KC_EXLM,   KC_AT, KC_HASH,  KC_DLR, KC_PERC,                      KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC,
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      KC_LCTL, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                      KC_MINS,  KC_EQL, KC_LBRC, KC_RBRC, KC_BSLS,  KC_GRV,
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      KC_LSFT, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                      KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE, KC_TILD,
+  //|--------+--------+--------+--------+--------+--------+--------|  |--------+--------+--------+--------+--------+--------+--------|
+                                          KC_LGUI, _______,  KC_SPC,     KC_ENT, _______, KC_RALT
+                                      //`--------------------------'  `--------------------------'
+  ),
+
+  [3] = LAYOUT_split_3x6_3( \
+  //,-----------------------------------------------------.                    ,-----------------------------------------------------.
+        RESET, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,\
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      RGB_TOG, RGB_HUI, RGB_SAI, RGB_VAI, XXXXXXX, XXXXXXX,                      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,\
+  //|--------+--------+--------+--------+--------+--------|                    |--------+--------+--------+--------+--------+--------|
+      RGB_MOD, RGB_HUD, RGB_SAD, RGB_VAD, XXXXXXX, XXXXXXX,                      XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,\
+  //|--------+--------+--------+--------+--------+--------+--------|  |--------+--------+--------+--------+--------+--------+--------|
+                                          KC_LGUI, _______,  KC_SPC,     KC_ENT, _______, KC_RALT\
+                                      //`--------------------------'  `--------------------------'
+  )
+};
+
+#ifdef OLED_DRIVER_ENABLE
+oled_rotation_t oled_init_user(oled_rotation_t rotation) {
+  if (!is_master) {
+    return OLED_ROTATION_180;  // flips the display 180 degrees if offhand
+  }
+  return rotation;
+}
+
+#define L_BASE 0
+#define L_LOWER 2
+#define L_RAISE 4
+#define L_ADJUST 8
+
+void oled_render_layer_state(void) {
+    oled_write_P("Layer: ", false);
+    switch (layer_state) {
+        case L_BASE:
+            oled_write_ln_P("Default", false);
+            break;
+        case L_LOWER:
+            oled_write_ln_P("Lower", false);
+            break;
+        case L_RAISE:
+            oled_write_ln_P("Raise", false);
+            break;
+        case L_ADJUST:
+        case L_ADJUST|L_LOWER:
+        case L_ADJUST|L_RAISE:
+        case L_ADJUST|L_LOWER|L_RAISE:
+            oled_write_ln_P("Adjust", false);
+            break;
+    }
+}
+
+
+char keylog_str[24] = {};
+char keylogs_str[21] = {};
+int keylogs_str_idx = 0;
+
+const char code_to_name[60] = {
+    ' ', ' ', ' ', ' ', 'a', 'b', 'c', 'd', 'e', 'f',
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
+    'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
+    'R', 'E', 'B', 'T', '_', '-', '=', '[', ']', '\\',
+    '#', ';', '\'', '`', ',', '.', '/', ' ', ' ', ' '};
+
+void set_keylog(uint16_t keycode, keyrecord_t *record) {
+  char name = ' ';
+    if ((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) ||
+        (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX)) { keycode = keycode & 0xFF; }
+  if (keycode < 60) {
+    name = code_to_name[keycode];
+  }
+
+  // update keylog
+  snprintf(keylog_str, sizeof(keylog_str), "%dx%d, k%2d : %c",
+           record->event.key.row, record->event.key.col,
+           keycode, name);
+
+  // update keylogs
+  if (keylogs_str_idx == sizeof(keylogs_str) - 1) {
+    keylogs_str_idx = 0;
+    for (int i = 0; i < sizeof(keylogs_str) - 1; i++) {
+      keylogs_str[i] = ' ';
+    }
+  }
+
+  keylogs_str[keylogs_str_idx] = name;
+  keylogs_str_idx++;
+}
+
+void oled_render_keylog(void) {
+    oled_write(keylog_str, false);
+}
+void oled_render_keylogs(void) {
+    oled_write(keylogs_str, false);
+}
+
+void render_bootmagic_status(bool status) {
+    /* Show Ctrl-Gui Swap options */
+    static const char PROGMEM logo[][2][3] = {
+        {{0x97, 0x98, 0}, {0xb7, 0xb8, 0}},
+        {{0x95, 0x96, 0}, {0xb5, 0xb6, 0}},
+    };
+    if (status) {
+        oled_write_ln_P(logo[0][0], false);
+        oled_write_ln_P(logo[0][1], false);
+    } else {
+        oled_write_ln_P(logo[1][0], false);
+        oled_write_ln_P(logo[1][1], false);
+    }
+}
+
+void oled_render_logo(void) {
+    static const char PROGMEM crkbd_logo[] = {
+        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94,
+        0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4,
+        0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4,
+        0};
+    oled_write_P(crkbd_logo, false);
+}
+
+void oled_task_user(void) {
+    if (is_master) {
+        oled_render_layer_state();
+        oled_render_keylog();
+        // oled_render_keylogs();
+        // oled_renger_bootmagic_icon(keymap_config.swap_lalt_lgui);
+    } else {
+        oled_render_logo();
+    }
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  if (record->event.pressed) {
+    set_keylog(keycode, record);
+    // set_timelog();
+  }
+  return true;
+}
+#endif // OLED_DRIVER_ENABLE
diff --git a/keyboards/crkbd/rev1/common/keymaps/via/rules.mk b/keyboards/crkbd/rev1/common/keymaps/via/rules.mk
new file mode 100644
index 0000000000..93b2afed44
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/keymaps/via/rules.mk
@@ -0,0 +1,5 @@
+MOUSEKEY_ENABLE     = no     # Mouse keys
+RGBLIGHT_ENABLE     = yes    # Enable WS2812 RGB underlight.
+VIA_ENABLE          = yes         # Enable VIA
+OLED_DRIVER_ENABLE  = yes
+LTO_ENABLE          = yes
diff --git a/keyboards/crkbd/rev1/common/rules.mk b/keyboards/crkbd/rev1/common/rules.mk
new file mode 100644
index 0000000000..0b8106e3f2
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/rules.mk
@@ -0,0 +1,2 @@
+SPLIT_KEYBOARD = yes
+SPLIT_TRANSPORT = mirror    # for when Split Mirroring drops, it will maintain mirroring functionality
diff --git a/keyboards/crkbd/rev1/common/ssd1306.c b/keyboards/crkbd/rev1/common/ssd1306.c
new file mode 100644
index 0000000000..4a889da673
--- /dev/null
+++ b/keyboards/crkbd/rev1/common/ssd1306.c
@@ -0,0 +1,360 @@
+#ifdef SSD1306OLED
+
+#include "ssd1306.h"
+#include "i2c_master.h"
+#include <string.h>
+#include "print.h"
+#ifdef ADAFRUIT_BLE_ENABLE
+#include "adafruit_ble.h"
+#endif
+#ifdef PROTOCOL_LUFA
+#include "lufa.h"
+#endif
+#include "sendchar.h"
+#include "timer.h"
+
+struct CharacterMatrix display;
+
+extern const unsigned char font[] PROGMEM;
+
+#ifndef OLED_BLANK_CHAR
+#define OLED_BLANK_CHAR ' '
+#endif
+
+#ifndef OLED_BITS_FILTER
+#define OLED_BITS_FILTER
+#endif
+
+// Set this to 1 to help diagnose early startup problems
+// when testing power-on with ble.  Turn it off otherwise,
+// as the latency of printing most of the debug info messes
+// with the matrix scan, causing keys to drop.
+#define DEBUG_TO_SCREEN 0
+
+//static uint16_t last_battery_update;
+//static uint32_t vbat;
+//#define BatteryUpdateInterval 10000 /* milliseconds */
+
+// 'last_flush' is declared as uint16_t,
+// so this must be less than 65535
+#ifndef ScreenOffInterval
+#define ScreenOffInterval 60000 /* milliseconds */
+#endif
+
+#if DEBUG_TO_SCREEN
+static uint8_t displaying;
+#endif
+static uint16_t last_flush;
+
+static bool force_dirty = true;
+
+// Write command sequence.
+// Returns true on success.
+static inline bool _send_cmd1(uint8_t cmd) {
+  bool res = false;
+
+  if (i2c_start(SSD1306_ADDRESS, 100)) {
+    xprintf("failed to start write to %d\n", SSD1306_ADDRESS);
+    goto done;
+  }
+
+  if (i2c_write(0x0 /* command byte follows */, 100)) {
+    print("failed to write control byte\n");
+
+    goto done;
+  }
+
+  if (i2c_write(cmd, 100)) {
+    xprintf("failed to write command %d\n", cmd);
+    goto done;
+  }
+  res = true;
+done:
+  i2c_stop();
+  return res;
+}
+
+#define send_cmd1(c) if (!_send_cmd1(c)) {goto done;}
+#define send_cmds(c) if (!_send_cmds(c,sizeof(c))) {goto done;}
+#define cmd1(X) X
+#define cmd2(X,Y) X,Y
+#define cmd3(X,Y,Z) X,Y,Z
+
+static bool _send_cmds(const uint8_t* p,uint8_t sz) {
+  for(uint8_t i=sz;i;i--) {
+    send_cmd1( pgm_read_byte(p++) );
+  }
+  return true;
+done:
+  return false;
+}
+
+#define SEND_CMDS(...) {static const uint8_t _cmds[] PROGMEM = { __VA_ARGS__,0 };send_cmds(_cmds);}
+
+static void clear_display(void) {
+  matrix_clear(&display);
+
+  // Clear all of the display bits (there can be random noise
+  // in the RAM on startup)
+  SEND_CMDS(
+    cmd3(PageAddr, 0, (DisplayHeight / 8) - 1),
+    cmd3(ColumnAddr, 0, DisplayWidth - 1)
+  );
+
+  if (i2c_start(SSD1306_ADDRESS, 100)) {
+    goto done;
+  }
+  if (i2c_write(0x40, 100)) {
+    // Data mode
+    goto done;
+  }
+  for (uint8_t row = MatrixRows;row; row--) {
+    for (uint8_t col = DisplayWidth; col; col--) {
+      i2c_write(0, 100);
+    }
+  }
+
+  display.dirty = false;
+
+done:
+  i2c_stop();
+}
+
+#if DEBUG_TO_SCREEN
+#undef sendchar
+static int8_t capture_sendchar(uint8_t c) {
+  sendchar(c);
+  iota_gfx_write_char(c);
+
+  if (!displaying) {
+    iota_gfx_flush();
+  }
+  return 0;
+}
+#endif
+
+bool iota_gfx_init(bool rotate) {
+  bool success = false;
+
+  i2c_init();
+  SEND_CMDS(
+    cmd1(DisplayOff),
+    cmd2(SetDisplayClockDiv, 0x80),
+    cmd2(SetMultiPlex, DisplayHeight - 1),
+    cmd2(SetDisplayOffset, 0),
+    cmd1(SetStartLine | 0x0),
+    cmd2(SetChargePump, 0x14 /* Enable */),
+    cmd2(SetMemoryMode, 0 /* horizontal addressing */)
+  );
+
+  if(rotate){
+    // the following Flip the display orientation 180 degrees
+  SEND_CMDS(
+    cmd1(SegRemap),
+    cmd1(ComScanInc)
+  );
+  }else{
+    // Flips the display orientation 0 degrees
+  SEND_CMDS(
+      cmd1(SegRemap | 0x1),
+      cmd1(ComScanDec)
+    );
+  }
+
+  SEND_CMDS(
+#ifdef SSD1306_128X64
+	cmd2(SetComPins, 0x12),
+#else
+	cmd2(SetComPins, 0x2),
+#endif
+    cmd2(SetContrast, 0x8f),
+    cmd2(SetPreCharge, 0xf1),
+    cmd2(SetVComDetect, 0x40),
+    cmd1(DisplayAllOnResume),
+    cmd1(NormalDisplay),
+    cmd1(DeActivateScroll),
+    cmd1(DisplayOn),
+
+    cmd2(SetContrast, 0) // Dim
+  );
+
+  clear_display();
+
+  success = true;
+
+  iota_gfx_flush();
+
+#if DEBUG_TO_SCREEN
+  print_set_sendchar(capture_sendchar);
+#endif
+
+done:
+  return success;
+}
+
+bool iota_gfx_off(void) {
+  bool success = false;
+
+  send_cmd1(DisplayOff);
+  success = true;
+
+done:
+  return success;
+}
+
+bool iota_gfx_on(void) {
+  bool success = false;
+
+  send_cmd1(DisplayOn);
+  success = true;
+
+done:
+  return success;
+}
+
+void matrix_write_char_inner(struct CharacterMatrix *matrix, uint8_t c) {
+  *matrix->cursor = c;
+  ++matrix->cursor;
+
+  if (matrix->cursor - &matrix->display[0][0] == sizeof(matrix->display)) {
+    // We went off the end; scroll the display upwards by one line
+    memmove(&matrix->display[0], &matrix->display[1],
+            MatrixCols * (MatrixRows - 1));
+    matrix->cursor = &matrix->display[MatrixRows - 1][0];
+    memset(matrix->cursor, OLED_BLANK_CHAR, MatrixCols);
+  }
+}
+
+void matrix_write_char(struct CharacterMatrix *matrix, uint8_t c) {
+  matrix->dirty = true;
+
+  if (c == '\n') {
+    // Clear to end of line from the cursor and then move to the
+    // start of the next line
+    uint8_t cursor_col = (matrix->cursor - &matrix->display[0][0]) % MatrixCols;
+
+    while (cursor_col++ < MatrixCols) {
+      matrix_write_char_inner(matrix, OLED_BLANK_CHAR);
+    }
+    return;
+  }
+
+  matrix_write_char_inner(matrix, c);
+}
+
+void iota_gfx_write_char(uint8_t c) {
+  matrix_write_char(&display, c);
+}
+
+void matrix_write(struct CharacterMatrix *matrix, const char *data) {
+  while (*data) {
+    matrix_write_char(matrix, *data);
+    ++data;
+  }
+}
+
+void matrix_write_ln(struct CharacterMatrix *matrix, const char *data) {
+  matrix_write(matrix, data);
+  matrix_write(matrix, "\n");
+}
+
+void iota_gfx_write(const char *data) {
+  matrix_write(&display, data);
+}
+
+void matrix_write_P(struct CharacterMatrix *matrix, const char *data) {
+  while (true) {
+    uint8_t c = pgm_read_byte(data);
+    if (c == 0) {
+      return;
+    }
+    matrix_write_char(matrix, c);
+    ++data;
+  }
+}
+
+void iota_gfx_write_P(const char *data) {
+  matrix_write_P(&display, data);
+}
+
+void matrix_clear(struct CharacterMatrix *matrix) {
+  memset(matrix->display, OLED_BLANK_CHAR, sizeof(matrix->display));
+  matrix->cursor = &matrix->display[0][0];
+  matrix->dirty = true;
+}
+
+void iota_gfx_clear_screen(void) {
+  matrix_clear(&display);
+}
+
+void matrix_render(struct CharacterMatrix *matrix) {
+  last_flush = timer_read();
+  iota_gfx_on();
+#if DEBUG_TO_SCREEN
+  ++displaying;
+#endif
+
+  // Move to the home position
+  SEND_CMDS(
+    cmd3(PageAddr, 0, MatrixRows - 1),
+    cmd3(ColumnAddr, 0, (MatrixCols * FontWidth) - 1)
+  );
+
+  if (i2c_write(SSD1306_ADDRESS, 100)) {
+    goto done;
+  }
+  if (i2c_write(0x40, 100)) {
+    // Data mode
+    goto done;
+  }
+
+  for (uint8_t row = 0; row < MatrixRows; ++row) {
+    for (uint8_t col = 0; col < MatrixCols; ++col) {
+      const uint8_t *glyph = font + (matrix->display[row][col] * FontWidth);
+
+      for (uint8_t glyphCol = 0; glyphCol < FontWidth; ++glyphCol) {
+        uint8_t colBits = pgm_read_byte(glyph + glyphCol);
+        i2c_write(colBits OLED_BITS_FILTER, 100);
+      }
+
+      // 1 column of space between chars (it's not included in the glyph)
+      //i2c_master_write(0);
+    }
+  }
+
+  matrix->dirty = false;
+
+done:
+  i2c_stop();
+#if DEBUG_TO_SCREEN
+  --displaying;
+#endif
+}
+
+void iota_gfx_flush(void) {
+  matrix_render(&display);
+}
+
+__attribute__ ((weak))
+void iota_gfx_task_user(void) {
+}
+
+void iota_gfx_task(void) {
+  iota_gfx_task_user();
+
+  if (display.dirty|| force_dirty) {
+    iota_gfx_flush();
+    force_dirty = false;
+  }
+
+  if (ScreenOffInterval !=0 && timer_elapsed(last_flush) > ScreenOffInterval) {
+    iota_gfx_off();
+  }
+}
+
+bool process_record_gfx(uint16_t keycode, keyrecord_t *record) {
+  force_dirty = true;
+  return true;
+}
+
+#endif
diff --git a/keyboards/crkbd/rev1/config.h b/keyboards/crkbd/rev1/config.h
index f7f278f2c0..60bd379724 100644
--- a/keyboards/crkbd/rev1/config.h
+++ b/keyboards/crkbd/rev1/config.h
@@ -1,6 +1,6 @@
 /*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-Copyright 2015 Jack Humbert
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
 
 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
@@ -18,64 +18,15 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-/* USB Device descriptor parameter */
-#define VENDOR_ID       0xFEED
-#define PRODUCT_ID      0x3060
-#define DEVICE_VER      0x0001
-#define MANUFACTURER    foostan
-#define PRODUCT         Corne Keyboard (crkbd)
-#define DESCRIPTION     A split keyboard with 3x6 vertically staggered keys and 3 thumb keys
-
-/* key matrix size */
-// Rows are doubled-up
-#define MATRIX_ROWS 8
-#define MATRIX_COLS 6
-#define MATRIX_ROW_PINS { D4, C6, D7, E6 }
-
-// wiring of each half
-#define MATRIX_COL_PINS { F4, F5, F6, F7, B1, B3 }
-// #define MATRIX_COL_PINS { B2, B3, B1, F7, F6, F5, F4 } //uncomment this line and comment line above if you need to reverse left-to-right key order
-
-/* 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 DEBOUNCE 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
-
 /* ws2812 RGB LED */
 #define RGB_DI_PIN D3
 
 #ifdef RGBLIGHT_ENABLE
-#define RGBLED_NUM 12    // Number of LEDs
+#    define RGBLED_NUM 12  // Number of LEDs
+#    define RGBLIGHT_SPLIT
 #endif
 
 #ifdef RGB_MATRIX_ENABLE
-#define RGBLED_NUM 54    // Number of LEDs
-#define DRIVER_LED_TOTAL RGBLED_NUM
+#    define RGBLED_NUM 54  // Number of LEDs
+#    define DRIVER_LED_TOTAL RGBLED_NUM
 #endif
-
-/*
- * 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
diff --git a/keyboards/crkbd/rev1/legacy/config.h b/keyboards/crkbd/rev1/legacy/config.h
new file mode 100644
index 0000000000..9e3676414c
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/config.h
@@ -0,0 +1,23 @@
+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2015 Jack Humbert
+
+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 <serial_config.h>
+
+#define PRODUCT         Corne Keyboard Rev.1 (Legacy Split)
diff --git a/keyboards/crkbd/i2c.c b/keyboards/crkbd/rev1/legacy/i2c.c
index 4bee5c6398..7b45c3f866 100644
--- a/keyboards/crkbd/i2c.c
+++ b/keyboards/crkbd/rev1/legacy/i2c.c
@@ -6,7 +6,7 @@
 #include <stdbool.h>
 #include "i2c.h"
 
-#ifdef USE_I2C
+#if defined(USE_I2C) || defined(USE_MATRIX_I2C)
 
 // Limits the amount of we wait for any one i2c transaction.
 // Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
diff --git a/keyboards/crkbd/i2c.h b/keyboards/crkbd/rev1/legacy/i2c.h
index 710662c7ab..710662c7ab 100644
--- a/keyboards/crkbd/i2c.h
+++ b/keyboards/crkbd/rev1/legacy/i2c.h
diff --git a/keyboards/crkbd/rev1/legacy/legacy.c b/keyboards/crkbd/rev1/legacy/legacy.c
new file mode 100644
index 0000000000..595ff1eaf7
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/legacy.c
@@ -0,0 +1,19 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 "legacy.h"
diff --git a/keyboards/crkbd/rev1/legacy/legacy.h b/keyboards/crkbd/rev1/legacy/legacy.h
new file mode 100644
index 0000000000..6c6308e592
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/legacy.h
@@ -0,0 +1,21 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 "rev1.h"
diff --git a/keyboards/crkbd/rev1/matrix.c b/keyboards/crkbd/rev1/legacy/matrix.c
index 46dead369f..46dead369f 100644
--- a/keyboards/crkbd/rev1/matrix.c
+++ b/keyboards/crkbd/rev1/legacy/matrix.c
diff --git a/keyboards/crkbd/rev1/legacy/post_config.h b/keyboards/crkbd/rev1/legacy/post_config.h
new file mode 100644
index 0000000000..b3d6346cc8
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/post_config.h
@@ -0,0 +1,27 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+#ifdef SSD1306OLED
+#    define USE_I2C
+#endif
+
+#if defined(OLED_DRIVER_ENABLE) && (defined(USE_I2C) || defined(USE_MATRIX_I2C))
+#    error Cannot use both legacy i2c driver and new i2c_master driver at the same time. Undefine USE_I2C and/or USE_MATRIX_I2C
+#endif
diff --git a/keyboards/crkbd/rev1/legacy/rules.mk b/keyboards/crkbd/rev1/legacy/rules.mk
new file mode 100644
index 0000000000..2bef242977
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/rules.mk
@@ -0,0 +1,7 @@
+CUSTOM_MATRIX = yes
+
+SRC += 	matrix.c \
+		split_util.c \
+		split_scomm.c
+
+QUANTUM_LIB_SRC += i2c.c serial.c
diff --git a/keyboards/crkbd/serial.c b/keyboards/crkbd/rev1/legacy/serial.c
index f6293c3dc2..f6293c3dc2 100644
--- a/keyboards/crkbd/serial.c
+++ b/keyboards/crkbd/rev1/legacy/serial.c
diff --git a/keyboards/crkbd/serial.h b/keyboards/crkbd/rev1/legacy/serial.h
index 7e0c0847a4..7e0c0847a4 100644
--- a/keyboards/crkbd/serial.h
+++ b/keyboards/crkbd/rev1/legacy/serial.h
diff --git a/keyboards/crkbd/rev1/legacy/serial_config.h b/keyboards/crkbd/rev1/legacy/serial_config.h
new file mode 100644
index 0000000000..40d11d4de2
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/serial_config.h
@@ -0,0 +1,22 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 SOFT_SERIAL_PIN
+#define SOFT_SERIAL_PIN D2
+#define SERIAL_USE_MULTI_TRANSACTION
+#endif
diff --git a/keyboards/crkbd/rev1/legacy/serial_config_simpleapi.h b/keyboards/crkbd/rev1/legacy/serial_config_simpleapi.h
new file mode 100644
index 0000000000..bd152ddda3
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/serial_config_simpleapi.h
@@ -0,0 +1,23 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
+
+#undef SERIAL_USE_MULTI_TRANSACTION
+#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
+#define SERIAL_MASTER_BUFFER_LENGTH MATRIX_ROWS/2
diff --git a/keyboards/crkbd/rev1/split_scomm.c b/keyboards/crkbd/rev1/legacy/split_scomm.c
index 12b00f6840..c14bb32a43 100644
--- a/keyboards/crkbd/rev1/split_scomm.c
+++ b/keyboards/crkbd/rev1/legacy/split_scomm.c
@@ -1,3 +1,21 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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/>.
+*/
+
 #ifdef USE_SERIAL
 #ifdef SERIAL_USE_MULTI_TRANSACTION
 /* --- USE flexible API (using multi-type transaction function) --- */
diff --git a/keyboards/crkbd/rev1/split_scomm.h b/keyboards/crkbd/rev1/legacy/split_scomm.h
index 873d8939d8..47f0ca1b9d 100644
--- a/keyboards/crkbd/rev1/split_scomm.h
+++ b/keyboards/crkbd/rev1/legacy/split_scomm.h
@@ -1,3 +1,21 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 SPLIT_COMM_H
 #define SPLIT_COMM_H
 
diff --git a/keyboards/crkbd/rev1/split_util.c b/keyboards/crkbd/rev1/legacy/split_util.c
index b642a734cc..d0fee04ad6 100644
--- a/keyboards/crkbd/rev1/split_util.c
+++ b/keyboards/crkbd/rev1/legacy/split_util.c
@@ -1,3 +1,21 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 <avr/io.h>
 #include <avr/wdt.h>
 #include <avr/power.h>
@@ -14,7 +32,7 @@
 #endif
 
 #ifdef USE_MATRIX_I2C
-#  include "i2c.h"
+#  include "i2c_master.h"
 #else
 #  include "split_scomm.h"
 #endif
@@ -81,7 +99,7 @@ __attribute__((weak)) bool has_usb(void) {
 static void keyboard_master_setup(void) {
 
 #ifdef USE_MATRIX_I2C
-    i2c_master_init();
+    i2c_init();
 #else
     serial_master_init();
 #endif
diff --git a/keyboards/crkbd/rev1/legacy/split_util.h b/keyboards/crkbd/rev1/legacy/split_util.h
new file mode 100644
index 0000000000..414763bff2
--- /dev/null
+++ b/keyboards/crkbd/rev1/legacy/split_util.h
@@ -0,0 +1,37 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 SPLIT_KEYBOARD_UTIL_H
+#define SPLIT_KEYBOARD_UTIL_H
+
+#include <stdbool.h>
+#include "eeconfig.h"
+
+#define SLAVE_I2C_ADDRESS           0x32
+
+extern volatile bool isLeftHand;
+
+// slave version of matix scan, defined in matrix.c
+void matrix_slave_scan(void);
+
+void split_keyboard_setup(void);
+bool has_usb(void);
+
+void matrix_master_OLED_init (void);
+
+#endif
diff --git a/keyboards/crkbd/ssd1306.c b/keyboards/crkbd/rev1/legacy/ssd1306.c
index 4ec8a9a00f..b04b7e15c1 100644
--- a/keyboards/crkbd/ssd1306.c
+++ b/keyboards/crkbd/rev1/legacy/ssd1306.c
@@ -134,7 +134,7 @@ bool iota_gfx_init(bool rotate) {
   bool success = false;
 
   i2c_master_init();
-  SEND_CMDS( 
+  SEND_CMDS(
     cmd1(DisplayOff),
     cmd2(SetDisplayClockDiv, 0x80),
     cmd2(SetMultiPlex, DisplayHeight - 1),
@@ -146,19 +146,19 @@ bool iota_gfx_init(bool rotate) {
 
   if(rotate){
     // the following Flip the display orientation 180 degrees
-  SEND_CMDS( 
+  SEND_CMDS(
     cmd1(SegRemap),
     cmd1(ComScanInc)
   );
   }else{
     // Flips the display orientation 0 degrees
-  SEND_CMDS( 
+  SEND_CMDS(
       cmd1(SegRemap | 0x1),
       cmd1(ComScanDec)
     );
   }
 
-  SEND_CMDS( 
+  SEND_CMDS(
 #ifdef SSD1306_128X64
 	cmd2(SetComPins, 0x12),
 #else
@@ -171,10 +171,10 @@ bool iota_gfx_init(bool rotate) {
     cmd1(NormalDisplay),
     cmd1(DeActivateScroll),
     cmd1(DisplayOn),
-  
+
     cmd2(SetContrast, 0) // Dim
   );
-  
+
   clear_display();
 
   success = true;
diff --git a/keyboards/crkbd/rev1/rev1.c b/keyboards/crkbd/rev1/rev1.c
index b26292af5b..5e4e6560f0 100644
--- a/keyboards/crkbd/rev1/rev1.c
+++ b/keyboards/crkbd/rev1/rev1.c
@@ -1,4 +1,21 @@
-#include "crkbd.h"
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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 "rev1.h"
 
 #ifdef RGB_MATRIX_ENABLE
 
@@ -68,11 +85,12 @@ led_config_t g_led_config = { {
 } };
 #endif
 
-__attribute__((weak))
-void matrix_init_user(void) {}
-
 void matrix_init_kb(void) {
 
+#ifdef KEYBOARD_crkbd_rev1_common
+    is_master = (uint8_t)is_keyboard_master();
+#endif
+
 #ifdef RGB_MATRIX_ENABLE
     if (!isLeftHand) {
         g_led_config = (led_config_t){ {
@@ -107,3 +125,9 @@ void matrix_init_kb(void) {
 #endif
     matrix_init_user();
 }
+
+#ifdef SSD1306OLED
+bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
+  return process_record_gfx(keycode,record) && process_record_user(keycode, record);
+}
+#endif
diff --git a/keyboards/crkbd/rev1/rev1.h b/keyboards/crkbd/rev1/rev1.h
index 2244b87f17..ce88068e64 100644
--- a/keyboards/crkbd/rev1/rev1.h
+++ b/keyboards/crkbd/rev1/rev1.h
@@ -1,25 +1,41 @@
+/*
+Copyright 2019 @foostan
+Copyright 2020 Drashna Jaelre <@drashna>
+
+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
 
+extern uint8_t is_master;
+
 #include "crkbd.h"
+#if defined(KEYBOARD_crkbd_rev1_legacy)
+#    include "legacy.h"
+#elif defined(KEYBOARD_crkbd_rev1_common)
+#    include "common.h"
+#endif
 
 #include "quantum.h"
-
+#include "split_util.h"
 #ifdef PROTOCOL_LUFA
-    #include "lufa.h"
-    #include "split_util.h"
+#    include "lufa.h"
 #endif
-
 #ifdef SSD1306OLED
-    #include "ssd1306.h"
+#    include "ssd1306.h"
 #endif
 
-#ifdef USE_I2C
-    #include <stddef.h>
-    #ifdef __AVR__
-        #include <avr/interrupt.h>
-        #include <avr/io.h>
-    #endif
-#endif
 
 // clang-format off
 #define LAYOUT_split_3x6_3( \
@@ -62,7 +78,7 @@
   L20, L21, L22, L23, L24, L25,           R20, R21, R22, R23, R24, R25, \
                       L30, L31, L32, R30, R31, R32 \
   ) \
-  LAYOUT( \
+  LAYOUT_split_3x6_3( \
     KC_##L00, KC_##L01, KC_##L02, KC_##L03, KC_##L04, KC_##L05,                     KC_##R00, KC_##R01, KC_##R02, KC_##R03, KC_##R04, KC_##R05, \
     KC_##L10, KC_##L11, KC_##L12, KC_##L13, KC_##L14, KC_##L15,                     KC_##R10, KC_##R11, KC_##R12, KC_##R13, KC_##R14, KC_##R15, \
     KC_##L20, KC_##L21, KC_##L22, KC_##L23, KC_##L24, KC_##L25,                     KC_##R20, KC_##R21, KC_##R22, KC_##R23, KC_##R24, KC_##R25, \
diff --git a/keyboards/crkbd/rev1/rules.mk b/keyboards/crkbd/rev1/rules.mk
index 21cee6bcf7..6bc5a5b038 100644
--- a/keyboards/crkbd/rev1/rules.mk
+++ b/keyboards/crkbd/rev1/rules.mk
@@ -1,5 +1,3 @@
-SRC += 	matrix.c \
-		split_util.c \
-		split_scomm.c
+LIB_SRC += ssd1306.c
 
-LAYOUTS = split_3x5_3 split_3x6_3
+DEFAULT_FOLDER = crkbd/rev1/legacy
diff --git a/keyboards/crkbd/rev1/serial_config.h b/keyboards/crkbd/rev1/serial_config.h
deleted file mode 100644
index 4fab8e8ddf..0000000000
--- a/keyboards/crkbd/rev1/serial_config.h
+++ /dev/null
@@ -1,4 +0,0 @@
-#ifndef SOFT_SERIAL_PIN
-#define SOFT_SERIAL_PIN D2
-#define SERIAL_USE_MULTI_TRANSACTION
-#endif
diff --git a/keyboards/crkbd/rev1/serial_config_simpleapi.h b/keyboards/crkbd/rev1/serial_config_simpleapi.h
deleted file mode 100644
index 0e1dd9e4ac..0000000000
--- a/keyboards/crkbd/rev1/serial_config_simpleapi.h
+++ /dev/null
@@ -1,5 +0,0 @@
-#pragma once
-
-#undef SERIAL_USE_MULTI_TRANSACTION
-#define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2
-#define SERIAL_MASTER_BUFFER_LENGTH MATRIX_ROWS/2
diff --git a/keyboards/crkbd/rev1/split_util.h b/keyboards/crkbd/rev1/split_util.h
deleted file mode 100644
index 687ca19bd3..0000000000
--- a/keyboards/crkbd/rev1/split_util.h
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef SPLIT_KEYBOARD_UTIL_H
-#define SPLIT_KEYBOARD_UTIL_H
-
-#include <stdbool.h>
-#include "eeconfig.h"
-
-#define SLAVE_I2C_ADDRESS           0x32
-
-extern volatile bool isLeftHand;
-
-// slave version of matix scan, defined in matrix.c
-void matrix_slave_scan(void);
-
-void split_keyboard_setup(void);
-bool has_usb(void);
-
-void matrix_master_OLED_init (void);
-
-#endif
diff --git a/keyboards/crkbd/ssd1306.h b/keyboards/crkbd/rev1/ssd1306.h
index 11a3cc67f4..11a3cc67f4 100644
--- a/keyboards/crkbd/ssd1306.h
+++ b/keyboards/crkbd/rev1/ssd1306.h
diff --git a/keyboards/crkbd/rules.mk b/keyboards/crkbd/rules.mk
index 16d05b589d..30de5b388d 100644
--- a/keyboards/crkbd/rules.mk
+++ b/keyboards/crkbd/rules.mk
@@ -31,12 +31,8 @@ RGBLIGHT_ENABLE = no       # Enable WS2812 RGB underlight.
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
-CUSTOM_MATRIX = yes
-QUANTUM_LIB_SRC += 	i2c.c \
-					serial.c
-SRC += ssd1306.c
-
 # if firmware size over limit, try this option
 # CFLAGS += -flto
+LAYOUTS = split_3x5_3 split_3x6_3
 
-DEFAULT_FOLDER = crkbd/rev1
+DEFAULT_FOLDER = crkbd/rev1/legacy