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/* Copyright 2021 @ Keychron (https://www.keychron.com)
*
* 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 <string.h>
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
#ifdef MATRIX_ROW_PINS
static pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
#endif // MATRIX_ROW_PINS
#ifdef MATRIX_COL_PINS
static pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
#endif // MATRIX_COL_PINS
#define ROWS_PER_HAND (MATRIX_ROWS)
/* matrix state(1:on, 0:off) */
extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
static inline void setPinOutput_writeLow(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinOutput(pin);
writePinLow(pin);
}
}
static inline void setPinOutput_writeHigh(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinOutput(pin);
writePinHigh(pin);
}
}
static inline void setPinInputHigh_atomic(pin_t pin) {
ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
}
static inline uint8_t readMatrixPin(pin_t pin) {
if (pin != NO_PIN) {
return readPin(pin);
} else {
return 1;
}
}
static bool select_col(uint8_t col) {
pin_t pin = col_pins[col];
if (pin != NO_PIN) {
setPinOutput_writeLow(pin);
return true;
}
return false;
}
static void unselect_col(uint8_t col) {
pin_t pin = col_pins[col];
if (pin != NO_PIN) {
setPinOutput_writeHigh(pin);
}
}
static void unselect_cols(void) {
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
unselect_col(x);
}
}
void matrix_init_pins(void) {
unselect_cols();
for (uint8_t x = 0; x < ROWS_PER_HAND; x++) {
if (row_pins[x] != NO_PIN) {
setPinInputHigh_atomic(row_pins[x]);
}
}
}
void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
bool key_pressed = false;
// Select col
if (!select_col(current_col)) { // select col
return; // skip NO_PIN col
}
matrix_output_select_delay();
// For each row...
for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
// Check row pin state
if (readMatrixPin(row_pins[row_index]) == 0) {
// Pin LO, set col bit
current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
key_pressed = true;
} else {
// Pin HI, clear col bit
current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col);
}
}
// Unselect col
unselect_col(current_col);
matrix_output_unselect_delay(current_col, key_pressed); // wait for all Row signals to go HIGH
}
void matrix_init_custom(void) {
// initialize key pins
matrix_init_pins();
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
// Set col, read rows
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
matrix_read_rows_on_col(curr_matrix, current_col);
}
bool changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
if (changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
return (uint8_t)changed;
}
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