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/* Copyright 2019
*
* 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 <avr/io.h>
#include <string.h>
#include "matrix.h"
#include "pca9555.h"
#include "quantum.h"
#include "debug.h"
// PCA9555 slave addresses
#define IC1 0x20
#define IC2 0x21
//_____Utility funcs___________________________________________________________
static void init_pins(void) {
// init all cols high - IC2 all input
pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);//same as initial state
pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);//same as initial state
// init all rows - IC1 port0 input
pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT);//same as initial state
}
static void select_row(uint8_t row) {
// For the XD84 all rows are on the same IC and port
// so its safe enough to assume here row == pin
uint8_t pin = row;
uint8_t mask = 1 << pin;
pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT & (~mask));
}
static uint16_t read_cols(void) {
uint16_t state_1 = pca9555_readPins(IC2, PCA9555_PORT0);
uint16_t state_2 = pca9555_readPins(IC2, PCA9555_PORT1);
// For the XD84 all cols are on the same IC and mapped sequentially
// while this technically gives 16 column reads,
// the 16th column can never be set so is safely ignored
return ~((state_2 << 8) | state_1);
}
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 selection to stabilize
select_row(current_row);
wait_us(30);
current_matrix[current_row] = read_cols();
// No need to Unselect row as the next `select_row` will blank everything
return (last_row_value != current_matrix[current_row]);
}
//_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
void custom_matrix_init(void) {
pca9555_init(IC1);
pca9555_init(IC2);
init_pins();
}
bool custom_matrix_scan(matrix_row_t current_matrix[]) {
bool changed = false;
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
changed |= read_cols_on_row(current_matrix, current_row);
}
return changed;
}
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