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/* Copyright 2023 @ 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 "quantum.h"
#define HC595_STCP B0
#define HC595_SHCP A1
#define HC595_DS A7
#define DIRECT_COL_NUM 0
pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
static inline uint8_t readMatrixPin(pin_t pin) {
if (pin != NO_PIN) {
return readPin(pin);
} else {
return 1;
}
}
static inline void setPinOutput_writeLow(pin_t pin) {
setPinOutput(pin);
writePinLow(pin);
}
static inline void HC595_initPin(void) {
setPinOutput(HC595_DS);
setPinOutput(HC595_STCP);
setPinOutput(HC595_SHCP);
}
static inline void HC595_delay(uint16_t n) {
while (n-- > 0) {
asm volatile("nop" ::: "memory");
}
}
static void HC595_output(uint16_t data, bool bit) {
uint8_t n = 1;
uint8_t i;
for (i = 1; i < 16; i++) {
if (data & 0x1) {
writePinHigh(HC595_DS);
} else {
writePinLow(HC595_DS);
}
HC595_delay(n);
writePinHigh(HC595_SHCP);
HC595_delay(n);
writePinLow(HC595_SHCP);
if (bit) {
break;
} else {
data >>= 1;
}
}
writePinHigh(HC595_STCP);
HC595_delay(n);
writePinLow(HC595_STCP);
}
static void select_col(uint8_t col) {
if (col == DIRECT_COL_NUM) {
HC595_output(0x0, 1);
HC595_output(0x1, 1);
}
}
static void unselect_col(void) {
HC595_output(0x1, 1);
}
static void unselect_cols(void) {
HC595_output(0xFFFF, 0);
}
void select_all_cols(void) {
HC595_output(0x0, 0);
}
static void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col, matrix_row_t row_shifter) {
bool key_pressed = false;
// Select col
select_col(current_col);
matrix_output_select_delay();
// For each row...
for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
// Check row pin state
if (readMatrixPin(row_pins[row_index]) == 0) {
// Pin LO, set col bit
current_matrix[row_index] |= row_shifter;
key_pressed = true;
} else {
// Pin HI, clear col bit
current_matrix[row_index] &= ~row_shifter;
}
}
// Unselect col
unselect_col();
matrix_output_unselect_delay(current_col, key_pressed); // wait for all Row signals to go HIGH
}
void matrix_init_custom(void) {
HC595_initPin();
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
if (row_pins[x] != NO_PIN) {
setPinInputHigh(row_pins[x]);
}
}
unselect_cols();
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
// Set col, read rows
matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++, row_shifter <<= 1) {
matrix_read_rows_on_col(curr_matrix, current_col, row_shifter);
}
bool changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
if (changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
return changed;
}
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