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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 "stdint.h"
#include "hal.h"
#include "gpio.h"
#include "quantum.h"
#define HC595_STCP A0
#define HC595_SHCP A1
#define HC595_DS C15
#define DIRECT_COL_NUM 1
pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
static inline void HC595_delay(uint16_t n) {
while (n-- > 0) {
asm volatile("nop" ::: "memory");
};
}
static void HC595_output(uint32_t data) {
uint8_t i;
uint8_t n = 1;
for (i = 24; i > 0; i--) {
writePinLow(HC595_SHCP);
if(data & 0x800000)
writePinHigh(HC595_DS);
else
writePinLow(HC595_DS);
data <<= 1;
HC595_delay(n);
writePinHigh(HC595_SHCP);
HC595_delay(n);
}
HC595_delay(n);
writePinLow(HC595_STCP);
HC595_delay(n);
writePinHigh(HC595_STCP);
}
static inline void setPinOutput_writeLow(pin_t pin) {
ATOMIC_BLOCK_FORCEON {
setPinOutput(pin);
writePinLow(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 (col < DIRECT_COL_NUM) {
setPinOutput_writeLow(pin);
return true;
} else {
HC595_output(~(0x01 << (col - DIRECT_COL_NUM)));
return true;
}
return false;
}
static void unselect_col(uint8_t col) {
pin_t pin = col_pins[col];
if (col < DIRECT_COL_NUM) {
setPinInputHigh_atomic(pin);
} else {
HC595_output(0xFFFFFF);
}
}
static void unselect_cols(void) {
for (uint8_t i = 0; i < DIRECT_COL_NUM; i++)
writePinHigh(col_pins[i]);
HC595_output(0xFFFFFF);
}
void select_all_cols(void) {
for (uint8_t i = 0; i < DIRECT_COL_NUM; i++)
setPinOutput_writeLow(col_pins[i]);
HC595_output(0x000000);
}
void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
// Select col
if (!select_col(current_col)) { // select col
return; // skip NO_PIN col
}
HC595_delay(100);
// 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] |= (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(current_col);
HC595_delay(100);
}
void matrix_init_custom(void) {
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
if (row_pins[x] != NO_PIN) {
setPinInputHigh_atomic(row_pins[x]);
}
}
setPinOutput(HC595_DS);
setPinOutput(HC595_STCP);
setPinOutput(HC595_SHCP);
unselect_cols();
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool matrix_has_changed = false;
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);
}
matrix_has_changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
if (matrix_has_changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
return matrix_has_changed;
}
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