[Keyboard] Add Ingrained Keyboard (#15928)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>
Co-authored-by: Juan Puerto <jpuerto@psc.edu>
Co-authored-by: jpuerto-psc <68066250+jpuerto-psc@users.noreply.github.com>

11 files changed, 725 insertions, 0 deletions

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