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/*
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_write_register((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data[0], 2, 20);
// Set Pull-up
i2c_write_register((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_read_register((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;
}
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