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diff --git a/keyboards/beekeeb/3w6hs/matrix.c b/keyboards/beekeeb/3w6hs/matrix.c
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+/*
+Copyright 2013 Oleg Kostyuk <[email protected]>
+ 2020 Pierre Chevalier <[email protected]>
+ 2021 weteor
+ 2023 beekeeb
+*/
+
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*
+ * 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 "matrix.h"
+#include "debug.h"
+#include "wait.h"
+#include "i2c_master.h"
+
+extern i2c_status_t tca9555_status;
+//#define I2C_TIMEOUT 1000
+
+// I2C address:
+// All address pins of the tca9555 are connected to the ground
+// | 0 | 1 | 0 | 0 | A2 | A1 | A0 |
+// | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
+#define I2C_ADDR (0b0100000 << 1)
+
+// Register addresses
+#define IODIRA 0x06 // i/o direction register
+#define IODIRB 0x07
+#define IREGP0 0x00 // GPIO pull-up resistor register
+#define IREGP1 0x01
+#define OREGP0 0x02 // general purpose i/o port register (write modifies OLAT)
+#define OREGP1 0x03
+
+bool i2c_initialized = 0;
+i2c_status_t tca9555_status = I2C_ADDR;
+
+uint8_t init_tca9555(void) {
+ dprint("starting init\n");
+ tca9555_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
+ uint8_t conf[2] = {
+ // This means: read all pins of port 0
+ 0b11111111,
+ // This means: we will write on pins 0 to 3 on port 1. read rest
+ 0b11110000,
+ };
+ tca9555_status = i2c_write_register(I2C_ADDR, IODIRA, conf, 2, I2C_TIMEOUT);
+
+ return tca9555_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 tca9555_reset_loop;
+
+void matrix_init_custom(void) {
+ // initialize row and col
+
+ tca9555_status = init_tca9555();
+
+ 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) {
+ tca9555_status = init_tca9555();
+
+ 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 (tca9555_status) { // if there was an error
+ if (++tca9555_reset_loop == 0) {
+ // since tca9555_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 tca9555\n");
+ tca9555_status = init_tca9555();
+ if (tca9555_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 tca9555
+ // not needed, already done as part of init_tca9555()
+
+ // init on mcu
+ pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_L;
+ for (int pin_index = 0; pin_index < MATRIX_COLS_PER_SIDE; pin_index++) {
+ pin_t pin = matrix_col_pins_mcu[pin_index];
+ gpio_set_pin_input_high(pin);
+ gpio_write_pin_high(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_L;
+ 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 = gpio_read_pin(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 (tca9555_status) { // if there was an error
+ return 0;
+ } else {
+ uint8_t data = 0;
+ uint8_t port0 = 0;
+ tca9555_status = i2c_read_register(I2C_ADDR, IREGP0, &port0, 1, I2C_TIMEOUT);
+ if (tca9555_status) { // if there was an error
+ // do nothing
+ return 0;
+ } else {
+ port0 = ~port0;
+ // 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.
+ // the pins connected to eact columns are sequential, but in reverse order, and counting from zero down (col 5 -> GPIO04, col6 -> GPIO03 and so on).
+ data |= (port0 & 0x01) << 4;
+ data |= (port0 & 0x02) << 2;
+ data |= (port0 & 0x04);
+ data |= (port0 & 0x08) >> 2;
+ data |= (port0 & 0x10) >> 4;
+
+ tca9555_status = I2C_STATUS_SUCCESS;
+ return data;
+ }
+ }
+ }
+}
+
+static void unselect_rows(void) {
+ // no need to unselect on tca9555, 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_L;
+ for (int pin_index = 0; pin_index < MATRIX_ROWS_PER_SIDE; pin_index++) {
+ pin_t pin = matrix_row_pins_mcu[pin_index];
+ gpio_set_pin_input_high(pin);
+ gpio_write_pin_low(pin);
+ }
+}
+
+static void select_row(uint8_t row) {
+ uint8_t port1 = 0xff;
+
+ if (row < MATRIX_ROWS_PER_SIDE) {
+ // select on atmega32u4
+ pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_L;
+ pin_t pin = matrix_row_pins_mcu[row];
+ gpio_set_pin_output(pin);
+ gpio_write_pin_low(pin);
+ } else {
+ // select on tca9555
+ if (tca9555_status) { // if there was an error
+ // do nothing
+ } else {
+ switch(row) {
+ case 4: port1 &= ~(1 << 0); break;
+ case 5: port1 &= ~(1 << 1); break;
+ case 6: port1 &= ~(1 << 2); break;
+ case 7:
+ port1 &= ~(1 << 3);
+ break;
+ default: break;
+ }
+
+ tca9555_status = i2c_write_register(I2C_ADDR, OREGP1, &port1, 1, I2C_TIMEOUT);
+ // 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.
+ }
+ }
+}