[Keyboard] gBoards GergoPlex (#13027)

* Moved gergoplex to seperate PR

* vendor + cformat

* Update keyboards/gboards/k/gergoplex/matrix.c

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

* lifiting keyboards up

* Update readme.md

* Update keyboards/gboards/gergoplex/config.h

Co-authored-by: Drashna Jaelre <drashna@live.com>

* remove English dicts

* cformatted

* Prettify keymap

* Remove via keymaps

Via doesn't support chords/combos, and this makes the keymap on such a
small keyboard quite uncomfortable and incomplete.

* Address QMK pull code review notes

* Cleanup (tabs, excessive comments)

* Fix keymap typos

* Use enum to define layers

* Multiple changes

 - got rid of LAYOUT_kc in favour of LAYOUT_split_3x5_3
 - fixed matrix custom C code to build with updated external dependencies (gcc)
 - fixed used combo docs

    keyboards/gboards/gergoplex/matrix.c:189:9: error: implicit declaration of function 'phex' [-Werror=implicit-function-declaration]
             phex(row);
             ^~~~
    keyboards/gboards/gergoplex/matrix.c:191:9: error: implicit declaration of function 'pbin_reverse16'; did you mean 'print_bin_reverse16'? [-Werror=implicit-function-declaration]
             pbin_reverse16(matrix_get_row(row));

* Remove apparently redundant macros

* Replace direct pin control with IO functions

* config mouse enable and combo delay fix

The default delay is 200:

    #define COMBO_TERM 200
        how long for the Combo keys to be detected. Defaults to TAPPING_TERM if not defined.

    tmk_core/common/action_tapping.h|22| 13:#    define TAPPING_TERM 200

* Remove redundant defines

* Unambiguously refer to the Special layer

* Fix formatting

* gboards/gergoplex set IGNORE_MOD_TAP_INTERRUPT

This solves my issue was with KC_CTL_A working correctly and it was set in @germ's repo
https://github.com/germ/qmk_firmware/blob/39c86e080dc04b68ee08387dcb5144c88cb44855/keyboards/gboards/k/gergoplex/config.h#L49

 https://beta.docs.qmk.fm/using-qmk/software-features/tap_hold#ignore-mod-tap-interrupt

* Name change

See commit 581368596ed

* Wording change

* Update keyboards/gboards/gergoplex/keymaps/default/keymap.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Add copyright headers

* Fix debounce type

 | avr-gcc: error: .build/obj_gboards_gergoplex_default/quantum/debounce/eager_pr.o: No such file or directory

* Implement colemak-dhm keymap

Co-authored-by: Germ <jeremythegeek@gmail.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Brian Tannous <Brian@BrianTannous.com>

15 files changed, 775 insertions, 0 deletions

diff --git a/keyboards/gboards/combos/colemakdhm-vim-helpers.def b/keyboards/gboards/combos/colemakdhm-vim-helpers.def
new file mode 100644
index 0000000000..f4950be05b
--- /dev/null
+++ b/keyboards/gboards/combos/colemakdhm-vim-helpers.def
@@ -0,0 +1,9 @@
+// Vim-Mode combos
+
+COMB(wfEsc,      KC_ESC,          KC_W, KC_F)
+COMB(rsBspc,     KC_BSPC,         KC_R, KC_S)
+COMB(stTab,      KC_TAB,          KC_S, KC_T)
+COMB(cdEnt,      KC_ENT,          KC_C, KC_D)
+COMB(luEsc,      KC_ESC,          KC_L, KC_U)
+COMB(neCol,      KC_COLN,         KC_N, KC_E)
+COMB(mkEnt,      KC_ENT,          KC_M, KC_K)
diff --git a/keyboards/gboards/gergoplex/config.h b/keyboards/gboards/gergoplex/config.h
new file mode 100644
index 0000000000..a6d8d6b1be
--- /dev/null
+++ b/keyboards/gboards/gergoplex/config.h
@@ -0,0 +1,52 @@
+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2013 Oleg Kostyuk <cub.uanic@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/>.
+*/
+
+// Copy and worked on with love from the EZ team
+
+#pragma once
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID 0x6B0A
+#define PRODUCT_ID 0x0002
+#define DEVICE_VER 0x0001
+#define MANUFACTURER g Heavy Industries
+#define PRODUCT GergoPlex
+
+/* key matrix size */
+#define MATRIX_ROWS 10
+#define MATRIX_ROWS_PER_SIDE (MATRIX_ROWS / 2)
+#define MATRIX_COLS 4
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ */
+#define MATRIX_ROW_PINS { F6, F5, F4, F1 }
+#define MATRIX_COL_PINS { B1, B2, B3, D2, D3 }
+#define UNUSED_PINS
+#define IGNORE_MOD_TAP_INTERRUPT
+#define COMBO_ALLOW_ACTION_KEYS
+#define COMBO_VARIABLE_LEN
+
+#define IS_COMMAND() (get_mods() == (MOD_BIT(KC_LCTL) | MOD_BIT(KC_RCTL)) || get_mods() == (MOD_BIT(KC_LSFT) | MOD_BIT(KC_RSFT)))
+
+#define DEBOUNCE 5
diff --git a/keyboards/gboards/gergoplex/gergoplex.c b/keyboards/gboards/gergoplex/gergoplex.c
new file mode 100644
index 0000000000..1e44583895
--- /dev/null
+++ b/keyboards/gboards/gergoplex/gergoplex.c
@@ -0,0 +1,68 @@
+/* Copyright 2021 Jane Bernhardt
+  *
+  * 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 "gergoplex.h"
+
+bool i2c_initialized = 0;
+i2c_status_t mcp23018_status = 0x20;
+
+void matrix_init_kb(void) {
+    matrix_init_user();
+}
+
+uint8_t init_mcp23018(void) {
+    print("starting init");
+    mcp23018_status = 0x20;
+
+    // I2C subsystem
+
+    if (i2c_initialized == 0) {
+        i2c_init();  // on pins D(1,0)
+        i2c_initialized = true;
+        _delay_ms(1000);
+    }
+
+    // set pin direction
+    // - unused  : input  : 1
+    // - input   : input  : 1
+    // - driving : output : 0
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(IODIRA, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b11000001, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b11111111, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    i2c_stop();
+
+    // set pull-up
+    // - unused  : on  : 1
+    // - input   : on  : 1
+    // - driving : off : 0
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(GPPUA, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b11000001, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b11111111, I2C_TIMEOUT);
+    if (mcp23018_status) goto out;
+
+out:
+    i2c_stop();
+    return mcp23018_status;
+}
diff --git a/keyboards/gboards/gergoplex/gergoplex.h b/keyboards/gboards/gergoplex/gergoplex.h
new file mode 100644
index 0000000000..507072a376
--- /dev/null
+++ b/keyboards/gboards/gergoplex/gergoplex.h
@@ -0,0 +1,56 @@
+/* Copyright 2021 Jane Bernhardt
+  *
+  * 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 "quantum.h"
+#include "i2c_master.h"
+
+extern i2c_status_t mcp23018_status;
+#define I2C_TIMEOUT 1000
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+#define CPU_16MHz 0x00
+
+// I2C aliases and register addresses (see "mcp23018.md")
+#define I2C_ADDR 0x20  // 0b0100000
+#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
+#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
+#define IODIRA 0x00  // i/o direction register
+#define IODIRB 0x01
+#define GPPUA 0x0C  // GPIO pull-up resistor register
+#define GPIOA 0x12  // general purpose i/o port register (write modifies OLAT)
+#define OLATA 0x14  // output latch register
+
+uint8_t init_mcp23018(void);
+
+#define LAYOUT_split_3x5_3( \
+    L00, L01, L02, L03, L04,        R00, R01, R02, R03, R04, \
+    L10, L11, L12, L13, L14,        R10, R11, R12, R13, R14, \
+    L20, L21, L22, L23, L24,        R20, R21, R22, R23, R24, \
+                L30, L31, L32,    R30, R31, R32 \
+    ) \
+    { \
+        {L04, L14, L24, KC_NO}, \
+        {L03, L13, L23, L32}, \
+        {L02, L12, L22, L31}, \
+        {L01, L11, L21, L30}, \
+        {L00, L10, L20, KC_NO}, \
+        {R00, R10, R20, KC_NO}, \
+        {R01, R11, R21, R30}, \
+        {R02, R12, R22, R31}, \
+        {R03, R13, R23, R32}, \
+        {R04, R14, R24, KC_NO}, \
+    }
diff --git a/keyboards/gboards/gergoplex/keymaps/colemak-dhm/combos.def b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/combos.def
new file mode 100644
index 0000000000..2aac5cb4ff
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/combos.def
@@ -0,0 +1,10 @@
+// List any combo dictionaries you want loaded to your device below!
+
+// User includes
+#include "gergoplex.def"
+
+// QMK wide includes
+#include "combos/colemakdhm-vim-helpers.def"
+
+// Word completion
+// #include "combos/eng-combos.def"
diff --git a/keyboards/gboards/gergoplex/keymaps/colemak-dhm/gergoplex.def b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/gergoplex.def
new file mode 100644
index 0000000000..7ed0122c4b
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/gergoplex.def
@@ -0,0 +1,11 @@
+// Gergoplex colemak-dhm specfic combos
+COMB(osBacksl,    KC_BSLS,          KC_Y, KC_SCLN)
+COMB(mnLess,      KC_LT,            KC_M, KC_N)
+COMB(eiGreat,     KC_GT,            KC_E, KC_I)
+COMB(xcDash,      KC_MINS,          KC_X, KC_C)
+COMB(hcUnds,      KC_UNDS,          KC_H, KC_COMM)
+COMB(khQuot,      KC_QUOT,          KC_K, KC_H)
+COMB(gvClic,      KC_BTN1,          KC_G, KC_V)
+COMB(tdClic,      KC_BTN2,          KC_T, KC_D)
+
+SUBS(pasta,       "I would just like to interject for a moment.",    KC_H, KC_J, KC_K, KC_L)
diff --git a/keyboards/gboards/gergoplex/keymaps/colemak-dhm/keymap.c b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/keymap.c
new file mode 100644
index 0000000000..ec2c17f8bc
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/keymap.c
@@ -0,0 +1,99 @@
+/* Good on you for modifying your layout! if you don't have
+ * time to read the QMK docs, a list of keycodes can be found at
+ * https://github.com/qmk/qmk_firmware/blob/master/docs/keycodes.md
+ */
+
+#include "gergoplex.h"
+#include "g/keymap_combo.h"
+
+enum {
+    _ALPHA,     // default (Colemak DHm)
+    _SPECIAL,   // special characters
+    _NUMBERS    // numbers/function/motion
+};
+
+// alpha hold modifiers
+#define KC_CTL_A  MT(MOD_LCTL, KC_A)     // Tap for A, hold for Control
+#define KC_CTL_O  MT(MOD_RCTL, KC_O)     // Tap for colon, hold for Control
+#define KC_SFT_Z  MT(MOD_LSFT, KC_Z)     // Tap for Z, hold for Shift
+#define KC_SFT_SL MT(MOD_RSFT, KC_SLSH)  // Tap for slash, hold for Shift
+
+// thumb modifiers/toggles
+#define KC_GUI_ESC MT(MOD_LGUI, KC_ESC)  // Tap for Esc, hold for GUI (Meta, Command, Win)
+#define KC_ALT_ENT MT(MOD_LALT, KC_ENT)  // Tap for Enter, hold for Alt (Option)
+#define KC_SPE_SPC LT(_SPECIAL, KC_SPC)  // Tap for Space, hold for Special layer
+#define KC_NUM_SPC LT(_NUMBERS, KC_SPC)  // Tap for Space, hold for Numbers layer
+#define KC_SFT_TAB MT(MOD_RSFT, KC_TAB)  // Tap for Tab, hold for Right Shift
+
+    /* Combomap
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |       |    ESC    |     |     |      |     |    ESC    |     \       |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |       |   BSPC   TAB    |     |      |     <     :     >     |       |
+     * |-------+-----+-----+-RMB-+-LMB-|      |ENTER+-----+-----+-----+-------|
+     * |       |     -   ENTER   |     |      |     '     _     |     |       |
+     * `-------------------------------'      `-------------------------------'
+     *            .-----------------.            .-----------------.
+     *            |     |     |     |            |     |     |     |
+     *            '-----------------'            '-----------------'
+     */
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Keymap 0: Alpha layer / Colemak DHm
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |     Q |  W  |  F  |  P  |  B  |      |  J  |  L  |  U  |  Y  |   ;   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * | CTRL A|  R  |  S  |  T  |  G  |      |  M  |  N  |  E  |  I  |   O   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * | SHFT Z|  X  |  C  |  D  |  V  |      |  K  |  H  |  <  |  >  |SHFT / |
+     * `-------------------------------'      `-------------------------------'
+     *   .------------------------------.    .----------------------.
+     *   | ESC META | ENT ALT | SPC SPE |    | SPC NUM | SHFT | TAB |
+     *   '------------------------------'    '----------------------'
+     */
+    [_ALPHA] = LAYOUT_split_3x5_3(
+         KC_Q,     KC_W,   KC_F,   KC_P,   KC_B,          KC_J,   KC_L,   KC_U,     KC_Y,   KC_SCLN,
+         KC_CTL_A, KC_R,   KC_S,   KC_T,   KC_G,          KC_M,   KC_N,   KC_E,     KC_I,   KC_CTL_O,
+         KC_SFT_Z, KC_X,   KC_C,   KC_D,   KC_V,          KC_K,   KC_H,   KC_COMMA, KC_DOT, KC_SFT_SL,
+             KC_GUI_ESC, KC_ALT_ENT, KC_SPE_SPC,          KC_NUM_SPC, KC_LSFT, KC_SFT_TAB),
+
+    /* Keymap 1: Special characters layer
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |    !  |  @  |  {  |  }  |  |  |      |  `  |  ~  |     |     |   \   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |    #  |  $  |  (  |  )  | RMB |      |  +  |  -  |  /  |  *  |   '   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |    %  |  ^  |  [  |  ]  | LMB |      |  &  |  =  |  ,  |  .  |   -   |
+     * `-------------------------------'      `-------------------------------'
+     *     .-------------------------.          .-----------------.
+     *     | ComboToggle |  ;  |  =  |          |  =  |  ;  | DEL |
+     *     '-------------------------'          '-----------------'
+     */
+    [_SPECIAL] = LAYOUT_split_3x5_3(
+         KC_EXLM, KC_AT,   KC_LCBR, KC_RCBR, KC_PIPE,          KC_GRV,  KC_TILD, KC_TRNS, KC_TRNS, KC_BSLS,
+         KC_HASH, KC_DLR,  KC_LPRN, KC_RPRN, KC_BTN2,          KC_PLUS, KC_MINS, KC_SLSH, KC_ASTR, KC_QUOT,
+         KC_PERC, KC_CIRC, KC_LBRC, KC_RBRC, KC_BTN1,          KC_AMPR, KC_EQL,  KC_COMM, KC_DOT,  KC_MINS,
+                            CMB_TOG, KC_SCLN, KC_EQL,          KC_EQL, KC_SCLN, KC_DEL),
+
+    /* Keymap 2: Numbers/Function/Motion layer
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |   1   |  2  |  3  |  4  |  5  |      |  6  |  7  |  8  |  9  |   0   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |  F1   | F2  | F3  | F4  | F5  |      | LFT | DWN | UP  | RGT | VOLUP |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |  F6   | F7  | F8  | F9  | F10 |      | MLFT| MDWN| MUP | MRGT| VOLDN |
+     * `-------------------------------'      `-------------------------------'
+     *             .-----------------.          .-----------------.
+     *             | F11 | F12 |     |          |     | PLY | SKP |
+     *             '-----------------'          '-----------------'
+     */
+    [_NUMBERS] = LAYOUT_split_3x5_3(
+         KC_1,  KC_2,  KC_3,  KC_4,  KC_5,           KC_6,    KC_7,    KC_8,    KC_9,    KC_0,
+         KC_F1, KC_F2, KC_F3, KC_F4, KC_F5,          KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_VOLU,
+         KC_F6, KC_F7, KC_F8, KC_F9, KC_F10,         KC_MS_L, KC_MS_D, KC_MS_U, KC_MS_R, KC_VOLD,
+                    KC_F11, KC_F12, KC_TRNS,         KC_TRNS,  KC_MPLY,  KC_MNXT)
+};
diff --git a/keyboards/gboards/gergoplex/keymaps/colemak-dhm/rules.mk b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/rules.mk
new file mode 100644
index 0000000000..e882b8008d
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/colemak-dhm/rules.mk
@@ -0,0 +1,17 @@
+#----------------------------------------------------------------------------
+# make gboards/gergoplex:default:flash
+# Make sure you have dfu-programmer installed!
+#----------------------------------------------------------------------------
+
+#Debug options
+VERBOSE                = no
+DEBUG_MATRIX_SCAN_RATE = no
+DEBUG_MATRIX           = no
+CONSOLE_ENABLE         = no
+
+#Combos!
+VPATH                  +=  keyboards/gboards/
+
+ifeq ($(strip $(DEBUG_MATRIX)), yes)
+    OPT_DEFS += -DDEBUG_MATRIX
+endif
diff --git a/keyboards/gboards/gergoplex/keymaps/default/combos.def b/keyboards/gboards/gergoplex/keymaps/default/combos.def
new file mode 100644
index 0000000000..97ea961e6e
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/default/combos.def
@@ -0,0 +1,11 @@
+// List any combo dictionaries you want loaded to your device below!
+
+// QMK wide includes
+#include "combos/germ-vim-helpers.def"
+#include "combos/germ-mouse-keys.def"
+
+// User includes
+#include "gergoplex.def"
+
+// Word completion
+// #include "combos/eng-combos.def"
diff --git a/keyboards/gboards/gergoplex/keymaps/default/gergoplex.def b/keyboards/gboards/gergoplex/keymaps/default/gergoplex.def
new file mode 100644
index 0000000000..6e50571b5b
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/default/gergoplex.def
@@ -0,0 +1,10 @@
+// Gergoplex specfic combos
+
+COMB(opBacksl,    KC_BSLS,          KC_O, KC_P)
+COMB(hjLess,      KC_LT,            KC_H, KC_J)
+COMB(klGreat,     KC_GT,            KC_K, KC_L)
+COMB(xcDash,      KC_MINS,          KC_X, KC_C)
+COMB(mcUnds,      KC_UNDS,          KC_M, KC_COMM)
+COMB(nmQuot,      KC_QUOT,          KC_N, KC_M)
+
+SUBS(pasta,       "I'd just like to interject for a moment.",       KC_H, KC_J, KC_K, KC_L)
diff --git a/keyboards/gboards/gergoplex/keymaps/default/keymap.c b/keyboards/gboards/gergoplex/keymaps/default/keymap.c
new file mode 100644
index 0000000000..c632751204
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/default/keymap.c
@@ -0,0 +1,113 @@
+/* Copyright 2021 Jane Bernhardt
+  *
+  * 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/>.
+  */
+
+/* Good on you for modifying your layout! if you don't have
+ * time to read the QMK docs, a list of keycodes can be found at
+ * https://github.com/qmk/qmk_firmware/blob/master/docs/keycodes.md
+ */
+
+#include QMK_KEYBOARD_H
+#include "g/keymap_combo.h"
+
+enum {
+    _ALPHA,   // default
+    _SPECIAL, // special characters
+    _NUMBERS  // numbers/function/motion
+};
+
+#define KC_CTL_A  MT(MOD_LCTL, KC_A)     // Tap for A, hold for Control
+#define KC_CTL_CL MT(MOD_LCTL, KC_SCLN)  // Tap for colon, hold for Control
+#define KC_SFT_Z  MT(MOD_RSFT, KC_Z)     // Tap for Z, hold for Shift
+#define KC_SFT_SL MT(MOD_RSFT, KC_SLSH)  // Tap for slash, hold for Shift
+
+#define KC_GUI_ESC MT(MOD_LGUI, KC_ESC)  // Tap for Esc, hold for GUI (Meta, Command, Win)
+#define KC_ALT_ENT MT(MOD_LALT, KC_ENT)  // Tap for Enter, hold for Alt (Option)
+#define KC_SPE_SPC LT(_SPECIAL, KC_SPC)  // Tap for Space, hold for Special layer
+#define KC_NUM_SPC LT(_NUMBERS, KC_SPC)  // Tap for Space, hold for Numbers layer
+#define KC_SFT_TAB MT(MOD_RSFT, KC_TAB)  // Tap for Tab, hold for Right Shift
+
+    /* Combomap
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |       |    ESC    |     |     |      |     |    ESC    |     \       |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |       |   BSPC   TAB    |     |      |     <     :     >     |       |
+     * |-------+-----+-----+-RMB-+-LMB-|      |ENTER+-----+-----+-----+-------|
+     * |       |     -   ENTER   |     |      |     '     _     |     |       |
+     * `-------------------------------'      `-------------------------------'
+     *            .-----------------.            .-----------------.
+     *            |     |     |     |            |     |     |     |
+     *            '-----------------'            '-----------------'
+     */
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Keymap 0: Alpha layer
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |     Q |  W  |  E  |  R  |  T  |      |  Y  |  U  |  I  |  O  |   P   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * | CTRL A|  S  |  D  |  F  |  G  |      |  H  |  J  |  K  |  L  |CTRL ; |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * | SHFT Z|  X  |  C  |  V  |  B  |      |  N  |  M  |  <  |  >  |SHFT / |
+     * `-------------------------------'      `-------------------------------'
+     *   .------------------------------.    .----------------------.
+     *   | ESC META | ENT ALT | SPC SPE |    | SPC NUM | SHFT | TAB |
+     *   '------------------------------'    '----------------------'
+     */
+    [_ALPHA] = LAYOUT_split_3x5_3(
+         KC_Q,     KC_W,   KC_E,   KC_R,   KC_T,          KC_Y,   KC_U,   KC_I,     KC_O,   KC_P,
+         KC_CTL_A, KC_S,   KC_D,   KC_F,   KC_G,          KC_H,   KC_J,   KC_K,     KC_L,   KC_CTL_CL,
+         KC_SFT_Z, KC_X,   KC_C,   KC_V,   KC_B,          KC_N,   KC_M,   KC_COMMA, KC_DOT, KC_SFT_SL,
+             KC_GUI_ESC, KC_ALT_ENT, KC_SPE_SPC,          KC_NUM_SPC, KC_LSFT, KC_SFT_TAB),
+
+    /* Keymap 1: Special characters layer
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |    !  |  @  |  {  |  }  |  |  |      |  `  |  ~  |     |     |   \   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |    #  |  $  |  (  |  )  | RMB |      |  +  |  -  |  /  |  *  |   '   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |    %  |  ^  |  [  |  ]  | LMB |      |  &  |  =  |  ,  |  .  |   -   |
+     * `-------------------------------'      `-------------------------------'
+     *     .-------------------------.          .-----------------.
+     *     | ComboToggle |  ;  |  =  |          |  =  |  ;  | DEL |
+     *     '-------------------------'          '-----------------'
+     */
+    [_SPECIAL] = LAYOUT_split_3x5_3(
+         KC_EXLM, KC_AT,   KC_LCBR, KC_RCBR, KC_PIPE,          KC_GRV,  KC_TILD, KC_TRNS, KC_TRNS, KC_BSLS,
+         KC_HASH, KC_DLR,  KC_LPRN, KC_RPRN, KC_BTN2,          KC_PLUS, KC_MINS, KC_SLSH, KC_ASTR, KC_QUOT,
+         KC_PERC, KC_CIRC, KC_LBRC, KC_RBRC, KC_BTN1,          KC_AMPR, KC_EQL,  KC_COMM, KC_DOT,  KC_MINS,
+                            CMB_TOG, KC_SCLN, KC_EQL,          KC_EQL, KC_SCLN, KC_DEL),
+
+    /* Keymap 2: Numbers/Function/Motion layer
+     *
+     * ,-------------------------------.      ,-------------------------------.
+     * |   1   |  2  |  3  |  4  |  5  |      |  6  |  7  |  8  |  9  |   0   |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |  F1   | F2  | F3  | F4  | F5  |      | LFT | DWN | UP  | RGT | VOLUP |
+     * |-------+-----+-----+-----+-----|      |-----+-----+-----+-----+-------|
+     * |  F6   | F7  | F8  | F9  | F10 |      | MLFT| MDWN| MUP | MRGT| VOLDN |
+     * `-------------------------------'      `-------------------------------'
+     *             .-----------------.          .-----------------.
+     *             | F11 | F12 |     |          |     | PLY | SKP |
+     *             '-----------------'          '-----------------'
+     */
+    [_NUMBERS] = LAYOUT_split_3x5_3(
+         KC_1,  KC_2,  KC_3,  KC_4,  KC_5,           KC_6,    KC_7,    KC_8,    KC_9,    KC_0,
+         KC_F1, KC_F2, KC_F3, KC_F4, KC_F5,          KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT, KC_VOLU,
+         KC_F6, KC_F7, KC_F8, KC_F9, KC_F10,         KC_MS_L, KC_MS_D, KC_MS_U, KC_MS_R, KC_VOLD,
+                    KC_F11, KC_F12, KC_TRNS,         KC_TRNS,  KC_MPLY,  KC_MNXT)
+};
diff --git a/keyboards/gboards/gergoplex/keymaps/default/rules.mk b/keyboards/gboards/gergoplex/keymaps/default/rules.mk
new file mode 100644
index 0000000000..e882b8008d
--- /dev/null
+++ b/keyboards/gboards/gergoplex/keymaps/default/rules.mk
@@ -0,0 +1,17 @@
+#----------------------------------------------------------------------------
+# make gboards/gergoplex:default:flash
+# Make sure you have dfu-programmer installed!
+#----------------------------------------------------------------------------
+
+#Debug options
+VERBOSE                = no
+DEBUG_MATRIX_SCAN_RATE = no
+DEBUG_MATRIX           = no
+CONSOLE_ENABLE         = no
+
+#Combos!
+VPATH                  +=  keyboards/gboards/
+
+ifeq ($(strip $(DEBUG_MATRIX)), yes)
+    OPT_DEFS += -DDEBUG_MATRIX
+endif
diff --git a/keyboards/gboards/gergoplex/matrix.c b/keyboards/gboards/gergoplex/matrix.c
new file mode 100644
index 0000000000..716390241a
--- /dev/null
+++ b/keyboards/gboards/gergoplex/matrix.c
@@ -0,0 +1,241 @@
+/*
+
+Copyright 2013 Oleg Kostyuk <cub.uanic@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/>.
+*/
+
+#include "matrix.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include "wait.h"
+#include "action_layer.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "debounce.h"
+#include "gergoplex.h"
+
+#ifdef BALLER
+#    include <avr/interrupt.h>
+#    include "pointing_device.h"
+#endif
+
+#ifndef DEBOUNCE
+#    define DEBOUNCE 5
+#endif
+
+// ATmega pin defs
+#define ROW1 (1 << 6)
+#define ROW2 (1 << 5)
+#define ROW3 (1 << 4)
+#define ROW4 (1 << 1)
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+/*
+ * matrix state(1:on, 0:off)
+ * contains the raw values without debounce filtering of the last read cycle.
+ */
+static matrix_row_t raw_matrix[MATRIX_ROWS];
+
+static const pin_t row_pins[MATRIX_COLS] = MATRIX_ROW_PINS;
+// Right-hand side only pins, the left side is controlled my MCP
+static const pin_t col_pins[MATRIX_ROWS_PER_SIDE] = MATRIX_COL_PINS;
+
+// Debouncing: store for each key the number of scans until it's eligible to
+// change.  When scanning the matrix, ignore any changes in keys that have
+// already changed in the last DEBOUNCE scans.
+
+static matrix_row_t read_cols(uint8_t row);
+static void         init_cols(void);
+static void         unselect_rows(void);
+static void         select_row(uint8_t row);
+
+static uint8_t mcp23018_reset_loop;
+
+__attribute__((weak)) void matrix_init_user(void) {}
+__attribute__((weak)) void matrix_scan_user(void) {}
+__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
+
+void matrix_init(void) {
+    // initialize row and col
+    mcp23018_status = init_mcp23018();
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        matrix[i]     = 0;
+        raw_matrix[i] = 0;
+    }
+
+    debounce_init(MATRIX_ROWS);
+    matrix_init_quantum();
+}
+void matrix_power_up(void) {
+    mcp23018_status = init_mcp23018();
+
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        matrix[i] = 0;
+    }
+}
+
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_raw_matrix_row(uint8_t index) {
+    matrix_row_t temp = read_cols(index);
+    if (raw_matrix[index] != temp) {
+        raw_matrix[index] = temp;
+        return true;
+    }
+    return false;
+}
+uint8_t matrix_scan(void) {
+    if (mcp23018_status) {  // if there was an error
+        if (++mcp23018_reset_loop == 0) {
+            // if (++mcp23018_reset_loop >= 1300) {
+            // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
+            // this will be approx bit more frequent than once per second
+            print("trying to reset mcp23018\n");
+            mcp23018_status = init_mcp23018();
+            if (mcp23018_status) {
+                print("left side not responding\n");
+            } else {
+                print("left side attached\n");
+            }
+        }
+    }
+
+    bool changed = false;
+    for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+        // select rows from left and right hands
+        uint8_t left_index  = i;
+        uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+        select_row(left_index);
+        select_row(right_index);
+
+        // we don't need a 30us delay anymore, because selecting a
+        // left-hand row requires more than 30us for i2c.
+
+        changed |= store_raw_matrix_row(left_index);
+        changed |= store_raw_matrix_row(right_index);
+
+        unselect_rows();
+    }
+
+    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+    matrix_scan_quantum();
+
+#ifdef DEBUG_MATRIX
+    for (uint8_t c = 0; c < MATRIX_COLS; c++)
+        for (uint8_t r = 0; r < MATRIX_ROWS; r++)
+            if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
+#endif
+
+    return 1;
+}
+
+bool matrix_is_modified(void)  // deprecated and evidently not called.
+{
+    return true;
+}
+
+inline bool         matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
+inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
+
+void matrix_print(void) {
+    print("\nr/c 0123456789ABCDEF\n");
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        print_hex8(row);
+        print(": ");
+        print_bin_reverse16(matrix_get_row(row));
+        print("\n");
+    }
+}
+uint8_t matrix_key_count(void) {
+    uint8_t count = 0;
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        count += bitpop16(matrix[i]);
+    }
+    return count;
+}
+
+// Remember this means ROWS
+static void init_cols(void) {
+    for (uint8_t row = 0; row < MATRIX_COLS; row++) {
+      setPinInputHigh(row_pins[row]);
+    }
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+    if (row < 5) {
+        if (mcp23018_status) {  // if there was an error
+            return 0;
+        } else {
+            uint8_t data    = 0;
+            mcp23018_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
+            if (mcp23018_status) goto out;
+            mcp23018_status = i2c_read_nack(I2C_TIMEOUT);
+            if (mcp23018_status < 0) goto out;
+            data            = ~((uint8_t)mcp23018_status);
+            mcp23018_status = I2C_STATUS_SUCCESS;
+        out:
+            i2c_stop();
+
+#ifdef DEBUG_MATRIX
+            if (data != 0x00) xprintf("I2C: %d\n", data);
+#endif
+            return data;
+        }
+    } else {
+        return ~((((PINF & ROW4) >> 1) | ((PINF & (ROW1 | ROW2 | ROW3)) >> 3)) & 0xF);
+    }
+}
+
+// Row pin configuration
+static void unselect_rows(void) {
+    // no need to unselect on mcp23018, because the select step sets all
+    // the other row bits high, and it's not changing to a different direction
+
+    for (uint8_t col = 0; col < MATRIX_ROWS_PER_SIDE; col++) {
+      setPinInput(col_pins[col]);
+      writePinLow(col_pins[col]);
+    }
+}
+
+static void select_row(uint8_t row) {
+    if (row < 5) {
+        // select on mcp23018
+        if (mcp23018_status) {  // do nothing on error
+        } else {                // set active row low  : 0 // set other rows hi-Z : 1
+            mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+            if (mcp23018_status) goto out;
+            mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT);
+            if (mcp23018_status) goto out;
+            mcp23018_status = i2c_write(0xFF & ~(1 << (row + 1)), I2C_TIMEOUT);
+            if (mcp23018_status) goto out;
+        out:
+            i2c_stop();
+        }
+    } else {
+        setPinOutput(col_pins[row - MATRIX_ROWS_PER_SIDE]);
+        writePinLow(col_pins[row - MATRIX_ROWS_PER_SIDE]);
+    }
+}
diff --git a/keyboards/gboards/gergoplex/readme.md b/keyboards/gboards/gergoplex/readme.md
new file mode 100644
index 0000000000..7728d90d41
--- /dev/null
+++ b/keyboards/gboards/gergoplex/readme.md
@@ -0,0 +1,43 @@
+# GergoPlex
+
+![GergoPlex](https://assets.bigcartel.com/product_images/248890490/IMG_20191114_1406385-01-01.jpeg)
+
+A compact 30% (5x3+3) Split Keyboard from g Heavy Industries
+
+* Keyboard Maintainer: [Jane Bernhardt](https://github.com/germ)
+* Hardware Supported: GergoPlex (Kit, Partial, Ready)
+* Hardware Availability: [gboards.ca](http://gboards.ca)
+
+## Firmware building
+
+Build using the following command (after setting up your build environment):
+
+```
+make gboards/gergoplex:default
+```
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
+
+Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+Switch `default` with `colemak-dhm` if you prefer to use [Colemak Mod-DH layout](https://colemakmods.github.io/mod-dh/).
+
+## Flashing
+
+Press the small SMD button on the right side board, and run:
+
+```
+make gboards/gergoplex:default:flash
+```
+
+### Troubleshooting
+
+See [this issue](https://github.com/qmk/qmk_toolbox/issues/58) for solutions if you're seeing:
+```
+dfu-programmer: no device present.
+ERROR: Bootloader not found. Trying again in 5s.
+```
+
+## Have an idea for a gadget or a keymap?
+
+[Reach out to me!](mailto:jane@gboards.ca) or submit a PR!
diff --git a/keyboards/gboards/gergoplex/rules.mk b/keyboards/gboards/gergoplex/rules.mk
new file mode 100644
index 0000000000..1d0ba8cae2
--- /dev/null
+++ b/keyboards/gboards/gergoplex/rules.mk
@@ -0,0 +1,18 @@
+MCU = atmega32u4
+
+BOOTLOADER = atmel-dfu
+
+CUSTOM_MATRIX    = yes
+MOUSEKEY_ENABLE  = yes  # Mouse keys
+COMBO_ENABLE     = yes
+EXTRAKEY_ENABLE  = yes
+CONSOLE_ENABLE   = no
+NKRO_ENABLE      = yes  # USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+COMMAND_ENABLE   = yes
+BOOTMAGIC_ENABLE = lite
+
+LAYOUTS = split_3x5_3
+
+DEBOUNCE_TYPE = sym_eager_pr
+SRC += matrix.c
+QUANTUM_LIB_SRC += i2c_master.c