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diff --git a/keyboards/gboards/ergotaco/matrix.c b/keyboards/gboards/ergotaco/matrix.c
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+/*
+
+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 QMK_KEYBOARD_H
+
+#ifndef DEBOUNCE
+# define DEBOUNCE 5
+#endif
+
+// ATmega pin defs
+#define ROW1 (1<<5)
+#define COL6 (1<<0)
+#define COL7 (1<<1)
+#define COL8 (1<<2)
+#define COL9 (1<<3)
+#define COL10 (1<<2)
+#define COL11 (1<<3)
+
+
+// bit masks
+#define BMASK (COL7 | COL8 | COL9 | COL6)
+#define DMASK (COL10 | COL11)
+#define FMASK (ROW1)
+
+/* 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];
+
+// 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 uint8_t debounce_matrix[MATRIX_ROWS * MATRIX_COLS];
+
+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;
+// static uint16_t mcp23018_reset_loop;
+
+__attribute__ ((weak))
+void matrix_init_user(void) {}
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {}
+
+__attribute__ ((weak))
+void matrix_init_kb(void) {
+ matrix_init_user();
+}
+
+__attribute__ ((weak))
+void matrix_scan_kb(void) {
+ matrix_scan_user();
+}
+
+inline
+uint8_t matrix_rows(void)
+{
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+ return MATRIX_COLS;
+}
+
+
+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;
+ for (uint8_t j=0; j < MATRIX_COLS; ++j) {
+ debounce_matrix[i * MATRIX_COLS + j] = 0;
+ }
+ }
+
+ 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;
+ }
+}
+
+// Returns a matrix_row_t whose bits are set if the corresponding key should be
+// eligible to change in this scan.
+matrix_row_t debounce_mask(matrix_row_t rawcols, uint8_t row) {
+ matrix_row_t result = 0;
+ matrix_row_t change = rawcols ^ raw_matrix[row];
+ raw_matrix[row] = rawcols;
+ for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
+ if (debounce_matrix[row * MATRIX_COLS + i]) {
+ --debounce_matrix[row * MATRIX_COLS + i];
+ } else {
+ result |= (1 << i);
+ }
+ if (change & (1 << i)) {
+ debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE;
+ }
+ }
+ return result;
+}
+
+matrix_row_t debounce_read_cols(uint8_t row) {
+ // Read the row without debouncing filtering and store it for later usage.
+ matrix_row_t cols = read_cols(row);
+ // Get the Debounce mask.
+ matrix_row_t mask = debounce_mask(cols, row);
+ // debounce the row and return the result.
+ return (cols & mask) | (matrix[row] & ~mask);;
+}
+
+uint8_t matrix_scan(void)
+{
+ // Then the keyboard
+ 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");
+ }
+ }
+ }
+
+ for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+ select_row(i);
+ // and select on left hand
+ select_row(i + MATRIX_ROWS_PER_SIDE);
+ // we don't need a 30us delay anymore, because selecting a
+ // left-hand row requires more than 30us for i2c.
+
+ // grab cols from left hand
+ matrix[i] = debounce_read_cols(i);
+ // grab cols from right hand
+ matrix[i + MATRIX_ROWS_PER_SIDE] = debounce_read_cols(i + MATRIX_ROWS_PER_SIDE);
+
+ unselect_rows();
+ }
+
+ 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;
+}
+
+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)
+{
+ // init on mcp23018
+ // not needed, already done as part of init_mcp23018()
+
+ // Input with pull-up(DDR:0, PORT:1)
+ DDRF &= ~FMASK;
+ PORTF |= FMASK;
+}
+
+static matrix_row_t read_cols(uint8_t row)
+{
+ if (row < 6) {
+ if (mcp23018_status) { // if there was an error
+ return 0;
+ } else {
+ uint8_t data = 0;
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPIOB, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_start(I2C_ADDR_READ, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_read_nack(ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status < 0) goto out;
+ data = (~((uint8_t)mcp23018_status) >> 2) & 0x01 ;
+ mcp23018_status = I2C_STATUS_SUCCESS;
+ out:
+ i2c_stop();
+
+#ifdef DEBUG_MATRIX
+ if (data != 0x00) xprintf("I2C: %d\n", data);
+#endif
+ return data;
+ }
+ } else {
+ // Read using bitmask
+ return ~((((PINF & ROW1) >> 5)) & 0x1);
+ }
+}
+
+// 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
+ // Hi-Z(DDR:0, PORT:0) to unselect
+ DDRB &= ~BMASK;
+ PORTB &= ~BMASK;
+ DDRD &= ~DMASK;
+ PORTD &= ~DMASK;
+}
+
+static void select_row(uint8_t row)
+{
+ if (row < 6) {
+ // select on mcp23018
+ if (mcp23018_status) { // do nothing on error
+ // Read using bitmask
+ } else { // set active row low : 0 // set other rows hi-Z : 1
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPIOA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(~(1<<row), ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
+ out:
+ i2c_stop();
+ }
+ } else {
+ // Output low(DDR:1, PORT:0) to select
+ switch (row) {
+ case 6:
+ DDRB |= COL6;
+ PORTB &= ~COL6;
+ break;
+ case 7:
+ DDRB |= COL7;
+ PORTB &= ~COL7;
+ break;
+ case 8:
+ DDRB |= COL8;
+ PORTB &= ~COL8;
+ break;
+ case 9:
+ DDRB |= COL9;
+ PORTB &= ~COL9;
+ break;
+ case 10:
+ DDRD |= COL10;
+ PORTD &= ~COL10;
+ break;
+ case 11:
+ DDRD |= COL11;
+ PORTD &= ~COL11;
+ break;
+ }
+ }
+}
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