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/*
Copyright 2012-2020 Jun Wako, Jack Humbert, Yiancar, Takeshi Nishio
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 "matrix.h"
#include "quantum.h"
#define ROW_SHIFTER ((uint16_t)1)
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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 unselect_rows(void) {
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
setPinInputHigh(row_pins[x]);
}
}
static void init_pins(void) {
unselect_rows();
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
setPinInputHigh(col_pins[x]);
}
}
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();
// For each col...
for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
// skip reading when index equals (= pin itself)
if (col_index != current_row) {
// Check col pin pin_state
if (readPin(col_pins[col_index]) == 0) {
// Pin LO, set col bit
current_matrix[current_row] |= (ROW_SHIFTER << col_index);
} else {
// Pin HI, clear col bit
current_matrix[current_row] &= ~(ROW_SHIFTER << col_index);
}
}
}
// Unselect row
unselect_row(current_row);
return (last_row_value != current_matrix[current_row]);
}
void matrix_init_custom(void) {
// initialize key pins
init_pins();
matrix_init_quantum();
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool changed = false;
// Set row, read cols
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
changed |= read_cols_on_row(current_matrix, current_row);
}
matrix_scan_quantum();
return changed;
}
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