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diff --git a/keyboards/moonlander/matrix.c b/keyboards/moonlander/matrix.c
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+/* Copyright 2020 ZSA Technology Labs, Inc <@zsa>
+ * Copyright 2020 Jack Humbert <jack.humb@gmail.com>
+ * Copyright 2020 Drashna Jael're <drashna@live.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 <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include "hal.h"
+#include "timer.h"
+#include "wait.h"
+#include "printf.h"
+#include "matrix.h"
+#include "action.h"
+#include "keycode.h"
+#include <string.h>
+#include "moonlander.h"
+#include "i2c_master.h"
+#include "debounce.h"
+
+/*
+#define MATRIX_ROW_PINS { B10, B11, B12, B13, B14, B15 } outputs
+#define MATRIX_COL_PINS { A0, A1, A2, A3, A6, A7, B0 } inputs
+ */
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing_right[MATRIX_COLS];
+static bool debouncing = false;
+static uint16_t debouncing_time = 0;
+static bool debouncing_right = false;
+static uint16_t debouncing_time_right = 0;
+
+#define ROWS_PER_HAND (MATRIX_ROWS / 2)
+
+#ifndef MATRIX_IO_DELAY
+# define MATRIX_IO_DELAY 20
+#endif
+
+extern bool mcp23018_leds[3];
+extern bool is_launching;
+
+__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(); }
+
+__attribute__((weak)) void matrix_io_delay(void) { wait_us(MATRIX_IO_DELAY); }
+
+bool mcp23018_initd = false;
+static uint8_t mcp23018_reset_loop;
+
+uint8_t mcp23018_tx[3];
+uint8_t mcp23018_rx[1];
+
+void mcp23018_init(void) {
+ i2c_init();
+
+ // #define MCP23_ROW_PINS { GPB5, GBP4, GBP3, GBP2, GBP1, GBP0 } outputs
+ // #define MCP23_COL_PINS { GPA0, GBA1, GBA2, GBA3, GBA4, GBA5, GBA6 } inputs
+
+ mcp23018_tx[0] = 0x00; // IODIRA
+ mcp23018_tx[1] = 0b00000000; // A is output
+ mcp23018_tx[2] = 0b00111111; // B is inputs
+
+ if (MSG_OK != i2c_transmit(MCP23018_DEFAULT_ADDRESS << 1, mcp23018_tx, 3, I2C_TIMEOUT)) {
+ printf("error hori\n");
+ } else {
+ mcp23018_tx[0] = 0x0C; // GPPUA
+ mcp23018_tx[1] = 0b10000000; // A is not pulled-up
+ mcp23018_tx[2] = 0b11111111; // B is pulled-up
+
+ if (MSG_OK != i2c_transmit(MCP23018_DEFAULT_ADDRESS << 1, mcp23018_tx, 3, I2C_TIMEOUT)) {
+ printf("error hori\n");
+ } else {
+ mcp23018_initd = is_launching = true;
+ }
+ }
+}
+
+void matrix_init(void) {
+ printf("matrix init\n");
+ // debug_matrix = true;
+
+ // outputs
+ setPinOutput(B10);
+ setPinOutput(B11);
+ setPinOutput(B12);
+ setPinOutput(B13);
+ setPinOutput(B14);
+ setPinOutput(B15);
+
+ // inputs
+ setPinInputLow(A0);
+ setPinInputLow(A1);
+ setPinInputLow(A2);
+ setPinInputLow(A3);
+ setPinInputLow(A6);
+ setPinInputLow(A7);
+ setPinInputLow(B0);
+
+ memset(matrix, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+ memset(matrix_debouncing, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+ memset(matrix_debouncing_right, 0, MATRIX_COLS * sizeof(matrix_row_t));
+
+ mcp23018_init();
+
+ matrix_init_quantum();
+}
+
+uint8_t matrix_scan(void) {
+ bool changed = false;
+
+ matrix_row_t data = 0;
+ // actual matrix
+ for (uint8_t row = 0; row < ROWS_PER_HAND; row++) {
+ // strobe row
+ switch (row) {
+ case 0: writePinHigh(B10); break;
+ case 1: writePinHigh(B11); break;
+ case 2: writePinHigh(B12); break;
+ case 3: writePinHigh(B13); break;
+ case 4: writePinHigh(B14); break;
+ case 5: writePinHigh(B15); break;
+ }
+
+ // need wait to settle pin state
+ matrix_io_delay();
+
+ // read col data
+ data = (
+ (readPin(A0) << 0 ) |
+ (readPin(A1) << 1 ) |
+ (readPin(A2) << 2 ) |
+ (readPin(A3) << 3 ) |
+ (readPin(A6) << 4 ) |
+ (readPin(A7) << 5 ) |
+ (readPin(B0) << 6 )
+ );
+
+ // unstrobe row
+ switch (row) {
+ case 0: writePinLow(B10); break;
+ case 1: writePinLow(B11); break;
+ case 2: writePinLow(B12); break;
+ case 3: writePinLow(B13); break;
+ case 4: writePinLow(B14); break;
+ case 5: writePinLow(B15); break;
+ }
+
+ if (matrix_debouncing[row] != data) {
+ matrix_debouncing[row] = data;
+ debouncing = true;
+ debouncing_time = timer_read();
+ changed = true;
+ }
+ }
+
+ for (uint8_t row = 0; row <= ROWS_PER_HAND; row++) {
+ // right side
+
+ if (!mcp23018_initd) {
+ 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_init();
+ if (!mcp23018_initd) {
+ print("left side not responding\n");
+ } else {
+ print("left side attached\n");
+#ifdef RGB_MATRIX_ENABLE
+ rgb_matrix_init();
+#endif
+ }
+ }
+ }
+
+ // #define MCP23_ROW_PINS { GPB5, GBP4, GBP3, GBP2, GBP1, GBP0 } outputs
+ // #define MCP23_COL_PINS { GPA0, GBA1, GBA2, GBA3, GBA4, GBA5, GBA6 } inputs
+
+ // select row
+
+ mcp23018_tx[0] = 0x12; // GPIOA
+ mcp23018_tx[1] = (0b01111111 & ~(1 << (row))) | ((uint8_t)!mcp23018_leds[2] << 7); // activate row
+ mcp23018_tx[2] = ((uint8_t)!mcp23018_leds[1] << 6) | ((uint8_t)!mcp23018_leds[0] << 7); // activate row
+
+ if (MSG_OK != i2c_transmit(MCP23018_DEFAULT_ADDRESS << 1, mcp23018_tx, 3, I2C_TIMEOUT)) {
+ printf("error hori\n");
+ mcp23018_initd = false;
+ }
+
+ // read col
+
+ mcp23018_tx[0] = 0x13; // GPIOB
+ if (MSG_OK != i2c_readReg(MCP23018_DEFAULT_ADDRESS << 1, mcp23018_tx[0], &mcp23018_rx[0], 1, I2C_TIMEOUT)) {
+ printf("error vert\n");
+ mcp23018_initd = false;
+ }
+
+ data = ~(mcp23018_rx[0] & 0b00111111);
+ // data = 0x01;
+
+ if (matrix_debouncing_right[row] != data) {
+ matrix_debouncing_right[row] = data;
+ debouncing_right = true;
+ debouncing_time_right = timer_read();
+ changed = true;
+ }
+ }
+
+ if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
+ for (int row = 0; row < ROWS_PER_HAND; row++) {
+ matrix[row] = matrix_debouncing[row];
+ }
+ debouncing = false;
+ }
+
+ if (debouncing_right && timer_elapsed(debouncing_time_right) > DEBOUNCE && mcp23018_initd) {
+ for (int row = 0; row < ROWS_PER_HAND; row++) {
+ matrix[11 - row] = 0;
+ for (int col = 0; col < MATRIX_COLS; col++) {
+ matrix[11 - row] |= ((matrix_debouncing_right[6 - col] & (1 << row) ? 1 : 0) << col);
+ }
+ }
+ debouncing_right = false;
+ }
+
+ matrix_scan_quantum();
+
+ return (uint8_t)changed;
+}
+
+bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & (1 << col)); }
+
+matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
+
+void matrix_print(void) {
+ printf("\nr/c 01234567\n");
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+ printf("%X0: ", row);
+ matrix_row_t data = matrix_get_row(row);
+ for (int col = 0; col < MATRIX_COLS; col++) {
+ if (data & (1 << col))
+ printf("1");
+ else
+ printf("0");
+ }
+ printf("\n");
+ }
+}
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