diff --git a/keyboards/ingrained/config.h b/keyboards/ingrained/config.h
new file mode 100644
index 0000000000..7741dde0f7
--- /dev/null
+++ b/keyboards/ingrained/config.h
@@ -0,0 +1,51 @@
+// Copyright 2021 s8erdude (@jpuerto96)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "config_common.h"
+
+/* key matrix size */
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 12
+
+#define MATRIX_ROWS_PER_SIDE (MATRIX_ROWS / 2)
+#define MATRIX_COLS_PER_SIDE (MATRIX_COLS / 2)
+
+#define UNUSED_MCU 13
+#define UNUSED_MCP 6
+
+
+// wiring
+#define MATRIX_ROW_PINS_MCU \
+ { B0, B1, B2, B3 }
+#define MATRIX_COL_PINS_MCU \
+ { F7, F6, F5, F4, F1, F0 }
+#define UNUSED_PINS_MCU \
+ { B4, B5, B6, B7, C6, C7, D2, D3, D4, D5, D6, D7, E6}
+#define MATRIX_ROW_PINS_MCP \
+ { B0, B1, B2, B3 }
+#define MATRIX_COL_PINS_MCP \
+ { A0, A1, A2, A3, A4, A5 }
+#define UNUSED_PINS_MCP \
+ { B4, B5, B6, B7, A6, A7 }
+
+/*
+ * 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
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ * ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+
+/* COL2ROW, ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
+//#define MATRIX_HAS_GHOST
diff --git a/keyboards/ingrained/info.json b/keyboards/ingrained/info.json
new file mode 100644
index 0000000000..1db1c930f6
--- /dev/null
+++ b/keyboards/ingrained/info.json
@@ -0,0 +1,276 @@
+{
+ "keyboard_name": "ingrained",
+ "manufacturer": "s8erdude"
+ "url": "https://github.com/jpuerto96",
+ "maintainer": "jpuerto96 (s8erdude)",
+ "usb": {
+ "vid": "0xB33F",
+ "pid": "0x58E4",
+ "device_version": "0.0.1"
+ },
+ "layouts": {
+ "LAYOUT_split_3x6_3": {
+ "layout": [
+ {
+ "label": "Esc",
+ "x": 0,
+ "y": 0.3
+ },
+ {
+ "label": "Q",
+ "x": 1,
+ "y": 0.3
+ },
+ {
+ "label": "W",
+ "x": 2,
+ "y": 0.1
+ },
+ {
+ "label": "E",
+ "x": 3,
+ "y": 0
+ },
+ {
+ "label": "R",
+ "x": 4,
+ "y": 0.1
+ },
+ {
+ "label": "T",
+ "x": 5,
+ "y": 0.2
+ },
+ {
+ "label": "Y",
+ "x": 9,
+ "y": 0.2
+ },
+ {
+ "label": "U",
+ "x": 10,
+ "y": 0.1
+ },
+ {
+ "label": "I",
+ "x": 11,
+ "y": 0
+ },
+ {
+ "label": "O",
+ "x": 12,
+ "y": 0.1
+ },
+ {
+ "label": "P",
+ "x": 13,
+ "y": 0.3
+ },
+ {
+ "label": "Back Space",
+ "x": 14,
+ "y": 0.3
+ },
+ {
+ "label": "Tab",
+ "x": 0,
+ "y": 1.3
+ },
+ {
+ "label": "A",
+ "x": 1,
+ "y": 1.3
+ },
+ {
+ "label": "S",
+ "x": 2,
+ "y": 1.1
+ },
+ {
+ "label": "D",
+ "x": 3,
+ "y": 1
+ },
+ {
+ "label": "F",
+ "x": 4,
+ "y": 1.1
+ },
+ {
+ "label": "G",
+ "x": 5,
+ "y": 1.2
+ },
+ {
+ "label": "H",
+ "x": 9,
+ "y": 1.2
+ },
+ {
+ "label": "J",
+ "x": 10,
+ "y": 1.1
+ },
+ {
+ "label": "K",
+ "x": 11,
+ "y": 1
+ },
+ {
+ "label": "L",
+ "x": 12,
+ "y": 1.1
+ },
+ {
+ "label": ";",
+ "x": 13,
+ "y": 1.3
+ },
+ {
+ "label": "'",
+ "x": 14,
+ "y": 1.3
+ },
+ {
+ "label": "Shift",
+ "x": 0,
+ "y": 2.3
+ },
+ {
+ "label": "Z",
+ "x": 1,
+ "y": 2.3
+ },
+ {
+ "label": "X",
+ "x": 2,
+ "y": 2.1
+ },
+ {
+ "label": "C",
+ "x": 3,
+ "y": 2
+ },
+ {
+ "label": "V",
+ "x": 4,
+ "y": 2.1
+ },
+ {
+ "label": "B",
+ "x": 5,
+ "y": 2.2
+ },
+ {
+ "label": "N",
+ "x": 9,
+ "y": 2.2
+ },
+ {
+ "label": "M",
+ "x": 10,
+ "y": 2.1
+ },
+ {
+ "label": ",",
+ "x": 11,
+ "y": 2
+ },
+ {
+ "label": ".",
+ "x": 12,
+ "y": 2.1
+ },
+ {
+ "label": "/",
+ "x": 13,
+ "y": 2.3
+ },
+ {
+ "label": "Shift",
+ "x": 14,
+ "y": 2.3
+ },
+ {
+ "label": "GUI",
+ "x": 4,
+ "y": 3.7
+ },
+ {
+ "label": "Lower",
+ "x": 5,
+ "y": 3.7
+ },
+ {
+ "label": "Space",
+ "x": 6,
+ "y": 3.2,
+ "h": 1.5
+ },
+ {
+ "label": "Enter",
+ "x": 8,
+ "y": 3.2,
+ "h": 1.5
+ },
+ {
+ "label": "Raise",
+ "x": 9,
+ "y": 3.7
+ },
+ {
+ "label": "Alt",
+ "x": 10,
+ "y": 3.7
+ }
+ ]
+ },
+ "LAYOUT_split_3x5_3": {
+ "layout": [
+ {"label":"Q", "x":0, "y":0.3},
+ {"label":"W", "x":1, "y":0.1},
+ {"label":"E", "x":2, "y":0},
+ {"label":"R", "x":3, "y":0.1},
+ {"label":"T", "x":4, "y":0.2},
+
+ {"label":"Y", "x":8, "y":0.2},
+ {"label":"U", "x":9, "y":0.1},
+ {"label":"I", "x":10, "y":0},
+ {"label":"O", "x":11, "y":0.1},
+ {"label":"P", "x":12, "y":0.3},
+
+ {"label":"A", "x":0, "y":1.3},
+ {"label":"S", "x":1, "y":1.1},
+ {"label":"D", "x":2, "y":1},
+ {"label":"F", "x":3, "y":1.1},
+ {"label":"G", "x":4, "y":1.2},
+
+ {"label":"H", "x":8, "y":1.2},
+ {"label":"J", "x":9, "y":1.1},
+ {"label":"K", "x":10, "y":1},
+ {"label":"L", "x":11, "y":1.1},
+ {"label":";", "x":12, "y":1.3},
+
+ {"label":"Z", "x":0, "y":2.3},
+ {"label":"X", "x":1, "y":2.1},
+ {"label":"C", "x":2, "y":2},
+ {"label":"V", "x":3, "y":2.1},
+ {"label":"B", "x":4, "y":2.2},
+
+ {"label":"N", "x":8, "y":2.2},
+ {"label":"M", "x":9, "y":2.1},
+ {"label":",", "x":10, "y":2},
+ {"label":".", "x":11, "y":2.1},
+ {"label":"/", "x":12, "y":2.3},
+
+ {"label":"GUI", "x":3, "y":3.7},
+ {"label":"Lower", "x":4, "y":3.7},
+ {"label":"Space", "x":5, "y":3.2, "h":1.5},
+
+ {"label":"Enter", "x":7, "y":3.2, "h":1.5},
+ {"label":"Raise", "x":8, "y":3.7},
+ {"label":"Alt", "x":9, "y":3.7}
+ ]
+ }
+ }
+}
diff --git a/keyboards/ingrained/ingrained.c b/keyboards/ingrained/ingrained.c
new file mode 100644
index 0000000000..80aa82f840
--- /dev/null
+++ b/keyboards/ingrained/ingrained.c
@@ -0,0 +1,4 @@
+// Copyright 2021 s8erdude (@jpuerto96)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "ingrained.h"
diff --git a/keyboards/ingrained/ingrained.h b/keyboards/ingrained/ingrained.h
new file mode 100644
index 0000000000..d2e3055951
--- /dev/null
+++ b/keyboards/ingrained/ingrained.h
@@ -0,0 +1,47 @@
+// Copyright 2021 s8erdude (@jpuerto96)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "quantum.h"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define XXX KC_NO
+
+#define LAYOUT_split_3x6_3( \
+ k00, k01, k02, k03, k04, k05, k011, k010, k09, k08, k07, k06,\
+ k10, k11, k12, k13, k14, k15, k111, k110, k19, k18, k17, k16,\
+ k20, k21, k22, k23, k24, k25, k211, k210, k29, k28, k27, k26,\
+ k33, k34, k35, k311, k310, k39\
+) { \
+ { k00, k01, k02, k03, k04, k05 },\
+ { k10, k11, k12, k13, k14, k15 },\
+ { k20, k21, k22, k23, k24, k25 },\
+ { XXX, XXX, XXX, k33, k34, k35 },\
+ { k06, k07, k08, k09, k010, k011 },\
+ { k16, k17, k18, k19, k110, k111 },\
+ { k26, k27, k28, k29, k210, k211 },\
+ { XXX, XXX, XXX, k39, k310, k311 }\
+}
+#define LAYOUT_split_3x5_3( \
+ k01, k02, k03, k04, k05, k011, k010, k09, k08, k07,\
+ k11, k12, k13, k14, k15, k111, k110, k19, k18, k17,\
+ k21, k22, k23, k24, k25, k211, k210, k29, k28, k27,\
+ k33, k34, k35, k311, k310, k39\
+) { \
+ { XXX, k01, k02, k03, k04, k05 },\
+ { XXX, k11, k12, k13, k14, k15 },\
+ { XXX, k21, k22, k23, k24, k25 },\
+ { XXX, XXX, XXX, k33, k34, k35 },\
+ { XXX, k07, k08, k09, k010, k011 },\
+ { XXX, k17, k18, k19, k110, k111 },\
+ { XXX, k27, k28, k29, k210, k211 },\
+ { XXX, XXX, XXX, k39, k310, k311 }\
+}
diff --git a/keyboards/ingrained/keymaps/3x5/keymap.c b/keyboards/ingrained/keymaps/3x5/keymap.c
new file mode 100644
index 0000000000..ed34809b42
--- /dev/null
+++ b/keyboards/ingrained/keymaps/3x5/keymap.c
@@ -0,0 +1,23 @@
+// Copyright 2021 s8erdude (@jpuerto96)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#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 layer_names {
+ _BASE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [_BASE] = 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_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN,
+ KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH,
+ KC_LGUI, KC_SPC, KC_TAB, KC_BSPC, KC_ENT, KC_RALT
+ )
+};
diff --git a/keyboards/ingrained/keymaps/3x5/readme.md b/keyboards/ingrained/keymaps/3x5/readme.md
new file mode 100644
index 0000000000..c2a997fcbf
--- /dev/null
+++ b/keyboards/ingrained/keymaps/3x5/readme.md
@@ -0,0 +1 @@
+# The 3x5 keymap for ingrained
diff --git a/keyboards/ingrained/keymaps/default/keymap.c b/keyboards/ingrained/keymaps/default/keymap.c
new file mode 100644
index 0000000000..b09702e9ee
--- /dev/null
+++ b/keyboards/ingrained/keymaps/default/keymap.c
@@ -0,0 +1,23 @@
+// Copyright 2021 s8erdude (@jpuerto96)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#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 layer_names {
+ _BASE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [_BASE] = LAYOUT_split_3x6_3(
+ KC_ESC, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSPC,
+ KC_TAB, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT,
+ KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT,
+ KC_LGUI, KC_SPC, KC_TAB, KC_BSPC, KC_ENT, KC_RALT
+ ),
+};
diff --git a/keyboards/ingrained/keymaps/default/readme.md b/keyboards/ingrained/keymaps/default/readme.md
new file mode 100644
index 0000000000..804feead66
--- /dev/null
+++ b/keyboards/ingrained/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for ingrained
diff --git a/keyboards/ingrained/matrix.c b/keyboards/ingrained/matrix.c
new file mode 100644
index 0000000000..0dfb150b6c
--- /dev/null
+++ b/keyboards/ingrained/matrix.c
@@ -0,0 +1,253 @@
+/*
+Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
+ 2020 Pierre Chevalier <pierrechevalier83@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/>.
+*/
+
+/*
+ * This code was heavily inspired by the ergodox_ez keymap, and modernized
+ * to take advantage of the quantum.h microcontroller agnostics gpio control
+ * abstractions and use the macros defined in config.h for the wiring as opposed
+ * to repeating that information all over the place.
+ */
+
+#include QMK_KEYBOARD_H
+#include "i2c_master.h"
+
+extern i2c_status_t mcp23017_status;
+#define I2C_TIMEOUT 1000
+
+// For a better understanding of the i2c protocol, this is a good read:
+// https://www.robot-electronics.co.uk/i2c-tutorial
+
+// I2C address:
+// See the datasheet, section 3.3.1 on addressing I2C devices and figure 3-6 for an
+// illustration
+// http://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf
+// All address pins of the mcp23017 are connected to the ground on the ferris
+// | 0 | 1 | 0 | 0 | A2 | A1 | A0 |
+// | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
+#define I2C_ADDR 0b0100000
+#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
+#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
+
+// Register addresses
+// See https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/blob/master/Adafruit_MCP23017.h
+#define IODIRA 0x00 // i/o direction register
+#define IODIRB 0x01
+#define GPPUA 0x0C // GPIO pull-up resistor register
+#define GPPUB 0x0D
+#define GPIOA 0x12 // general purpose i/o port register (write modifies OLAT)
+#define GPIOB 0x13
+#define OLATA 0x14 // output latch register
+#define OLATB 0x15
+
+bool i2c_initialized = 0;
+i2c_status_t mcp23017_status = I2C_ADDR;
+
+uint8_t init_mcp23017(void) {
+ print("starting init");
+ mcp23017_status = I2C_ADDR;
+
+ // I2C subsystem
+ if (i2c_initialized == 0) {
+ i2c_init(); // on pins D(1,0)
+ i2c_initialized = true;
+ wait_ms(I2C_TIMEOUT);
+ }
+
+ // set pin direction
+ // - unused : input : 1
+ // - input : input : 1
+ // - driving : output : 0
+ // This means: we will read all the bits on GPIOA
+ // This means: we will write to the pins 0-4 on GPIOB (in select_rows)
+ uint8_t buf[] = {IODIRA, 0b11111111, 0b11110000};
+ mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), I2C_TIMEOUT);
+ if (!mcp23017_status) {
+ // set pull-up
+ // - unused : on : 1
+ // - input : on : 1
+ // - driving : off : 0
+ // This means: we will read all the bits on GPIOA
+ // This means: we will write to the pins 0-4 on GPIOB (in select_rows)
+ uint8_t pullup_buf[] = {GPPUA, 0b11111111, 0b11110000};
+ mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, pullup_buf, sizeof(pullup_buf), I2C_TIMEOUT);
+ }
+ return mcp23017_status;
+}
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS]; // debounced values
+
+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 mcp23017_reset_loop;
+
+void matrix_init_custom(void) {
+ // initialize row and col
+
+ mcp23017_status = init_mcp23017();
+
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ }
+}
+
+void matrix_power_up(void) {
+ mcp23017_status = init_mcp23017();
+
+ 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_matrix_row(matrix_row_t current_matrix[], uint8_t index) {
+ matrix_row_t temp = read_cols(index);
+ if (current_matrix[index] != temp) {
+ current_matrix[index] = temp;
+ return true;
+ }
+ return false;
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+ if (mcp23017_status) { // if there was an error
+ if (++mcp23017_reset_loop == 0) {
+ // if (++mcp23017_reset_loop >= 1300) {
+ // since mcp23017_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
+ dprint("trying to reset mcp23017\n");
+ mcp23017_status = init_mcp23017();
+ if (mcp23017_status) {
+ dprint("right side not responding\n");
+ } else {
+ dprint("right 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_matrix_row(current_matrix, left_index);
+ changed |= store_matrix_row(current_matrix, right_index);
+
+ unselect_rows();
+ }
+
+ return changed;
+}
+
+static void init_cols(void) {
+ // init on mcp23017
+ // not needed, already done as part of init_mcp23017()
+
+ // init on mcu
+ pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_MCU;
+ for (int pin_index = 0; pin_index < MATRIX_COLS_PER_SIDE; pin_index++) {
+ pin_t pin = matrix_col_pins_mcu[pin_index];
+ setPinInput(pin);
+ writePinHigh(pin);
+ }
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+ if (row < MATRIX_ROWS_PER_SIDE) {
+ pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_MCU;
+ matrix_row_t current_row_value = 0;
+ // For each col...
+ for (uint8_t col_index = 0; col_index < MATRIX_COLS_PER_SIDE; col_index++) {
+ // Select the col pin to read (active low)
+ uint8_t pin_state = readPin(matrix_col_pins_mcu[col_index]);
+
+ // Populate the matrix row with the state of the col pin
+ current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+ }
+ return current_row_value;
+ } else {
+ if (mcp23017_status) { // if there was an error
+ return 0;
+ } else {
+ uint8_t buf[] = {GPIOA};
+ mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), I2C_TIMEOUT);
+ // We read all the pins on GPIOA.
+ // The initial state was all ones and any depressed key at a given column for the currently selected row will have its bit flipped to zero.
+ // The return value is a row as represented in the generic matrix code were the rightmost bits represent the lower columns and zeroes represent non-depressed keys while ones represent depressed keys.
+ // Since the pins connected to eact columns are sequential, and counting from zero up (col 5 -> GPIOA0, col 6 -> GPIOA1 and so on), the only transformation needed is a bitwise not to swap all zeroes and ones.
+ uint8_t data[] = {0};
+ if (!mcp23017_status) {
+ mcp23017_status = i2c_receive(I2C_ADDR_READ, data, sizeof(data), I2C_TIMEOUT);
+ data[0] = ~(data[0]);
+ }
+ return data[0];
+ }
+ }
+}
+
+static void unselect_rows(void) {
+ // no need to unselect on mcp23017, because the select step sets all
+ // the other row bits high, and it's not changing to a different
+ // direction
+
+ // unselect rows on microcontroller
+ pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU;
+ for (int pin_index = 0; pin_index < MATRIX_ROWS_PER_SIDE; pin_index++) {
+ pin_t pin = matrix_row_pins_mcu[pin_index];
+ setPinInput(pin);
+ writePinLow(pin);
+ }
+}
+
+static void select_row(uint8_t row) {
+ if (row < MATRIX_ROWS_PER_SIDE) {
+ // select on atmega32u4
+ pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU;
+ pin_t pin = matrix_row_pins_mcu[row];
+ setPinOutput(pin);
+ writePinLow(pin);
+ } else {
+ // select on mcp23017
+ if (mcp23017_status) { // if there was an error
+ // do nothing
+ } else {
+ // Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one.
+ // Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus.
+ uint8_t buf[] = {GPIOB, 0xFF & ~(1 << (row - MATRIX_ROWS_PER_SIDE))};
+ mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), I2C_TIMEOUT);
+ }
+ }
+}
diff --git a/keyboards/ingrained/readme.md b/keyboards/ingrained/readme.md
new file mode 100644
index 0000000000..3e616e52bb
--- /dev/null
+++ b/keyboards/ingrained/readme.md
@@ -0,0 +1,19 @@
+# ingrained
+
+This PCB is an integrated, USB-C to USB-C, Corne replacement.
+
+* Keyboard Maintainer: [s8erdude](https://github.com/jpuerto96)
+* Hardware Supported: Ingrained PCB
+* Hardware Availability: [Open Source PCB](https://github.com/jpuerto96/crkbd)
+
+Make example for this keyboard (after setting up your build environment):
+
+ make ingrained:default
+
+Flashing example for this keyboard:
+
+ make ingrained:default:flash
+
+To reset the board, you will want to short the pad labeled RESET on the main half (near the USB-C interconnect).
+
+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).
diff --git a/keyboards/ingrained/rules.mk b/keyboards/ingrained/rules.mk
new file mode 100644
index 0000000000..03e074deda
--- /dev/null
+++ b/keyboards/ingrained/rules.mk
@@ -0,0 +1,27 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+# change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes # Mouse keys
+EXTRAKEY_ENABLE = yes # Audio control and System control
+CONSOLE_ENABLE = no # Console for debug
+COMMAND_ENABLE = no # Commands for debug and configuration
+NKRO_ENABLE = no # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no # Enable keyboard RGB underglow
+AUDIO_ENABLE = no # Audio output
+UNICODE_ENABLE = yes
+CUSTOM_MATRIX = lite
+NO_USB_STARTUP_CHECK = yes
+LTO_ENABLE = yes
+
+SRC += matrix.c
+QUANTUM_LIB_SRC += i2c_master.c
+
+LAYOUTS = split_3x5_3 split_3x6_3