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qmk_firmware/keyboards/3w6/rev2/matrix.c

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/*
Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
2020 Pierre Chevalier <pierrechevalier83@gmail.com>
2021 weteor
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 "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) {
print("starting init");
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_writeReg(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];
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_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 = 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 (tca9555_status) { // if there was an error
return 0;
} else {
uint8_t data = 0;
uint8_t port0 = 0;
tca9555_status = i2c_readReg(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];
setPinInput(pin);
writePinLow(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];
setPinOutput(pin);
writePinLow(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_writeReg(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.
}
}
}
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