139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*
|
|
Copyright 2021 Matthew Dias
|
|
|
|
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 "wait.h"
|
|
#include "quantum.h"
|
|
#include "i2c_master.h"
|
|
|
|
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
|
|
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
|
|
|
|
static void unselect_rows(void) {
|
|
for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
|
|
setPinInputHigh(row_pins[x]);
|
|
}
|
|
}
|
|
|
|
static void select_row(uint8_t row) {
|
|
setPinOutput(row_pins[row]);
|
|
writePinLow(row_pins[row]);
|
|
}
|
|
|
|
static void unselect_row(uint8_t row) {
|
|
setPinInputHigh(row_pins[row]);
|
|
}
|
|
|
|
static void init_pins(void) {
|
|
unselect_rows();
|
|
// Set I/O
|
|
uint8_t send_data[2] = { 0xFF, 0x03};
|
|
i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data[0], 2, 20);
|
|
// Set Pull-up
|
|
i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x0C, &send_data[0], 2, 20);
|
|
|
|
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
|
|
if ( x < 8 ) {
|
|
setPinInputHigh(col_pins[x]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void matrix_init_custom(void) {
|
|
// TODO: initialize hardware here
|
|
// Initialize I2C
|
|
i2c_init();
|
|
|
|
// initialize key pins
|
|
init_pins();
|
|
wait_ms(50);
|
|
}
|
|
|
|
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
|
|
// Store last value of row prior to reading
|
|
matrix_row_t last_row_value = current_matrix[current_row];
|
|
|
|
// Clear data in matrix row
|
|
current_matrix[current_row] = 0;
|
|
|
|
// Select row and wait for row selecton to stabilize
|
|
select_row(current_row);
|
|
matrix_io_delay();
|
|
|
|
uint8_t port_expander_col_buffer[2];
|
|
i2c_readReg((PORT_EXPANDER_ADDRESS << 1), 0x12, &port_expander_col_buffer[0], 2, 20);
|
|
|
|
// For each col...
|
|
for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
|
|
uint8_t pin_state;
|
|
// Select the col pin to read (active low)
|
|
switch (col_index) {
|
|
case 8 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 0);
|
|
break;
|
|
case 9 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 1);
|
|
break;
|
|
case 10 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 2);
|
|
break;
|
|
case 11 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 3);
|
|
break;
|
|
case 12 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 4);
|
|
break;
|
|
case 13 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 5);
|
|
break;
|
|
case 14 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 6);
|
|
break;
|
|
case 15 :
|
|
pin_state = port_expander_col_buffer[0] & (1 << 7);
|
|
break;
|
|
case 16 :
|
|
pin_state = port_expander_col_buffer[1] & (1 << 0);
|
|
break;
|
|
case 17 :
|
|
pin_state = port_expander_col_buffer[1] & (1 << 1);
|
|
break;
|
|
default :
|
|
pin_state = readPin(col_pins[col_index]);
|
|
}
|
|
|
|
// Populate the matrix row with the state of the col pin
|
|
current_matrix[current_row] |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
|
|
}
|
|
|
|
// Unselect row
|
|
unselect_row(current_row);
|
|
|
|
return (last_row_value != current_matrix[current_row]);
|
|
}
|
|
|
|
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
|
|
bool matrix_has_changed = false;
|
|
|
|
// Set row, read cols
|
|
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
|
|
matrix_has_changed |= read_cols_on_row(current_matrix, current_row);
|
|
}
|
|
|
|
return matrix_has_changed;
|
|
}
|