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// Copyright 2022 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* scan matrix
*/
#include "matrix.h"
#include <string.h>
#include "atomic_util.h"
#include "wait.h"
#include "debug.h"
#include "util.h"
#include "debounce.h"
/* matrix state(1:on, 0:off) */
extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
#define MATRIX_ROW_SHIFTER ((matrix_row_t)1)
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_row(uint8_t row) {
pin_t pin = row_pins[row];
if (pin != NO_PIN) {
setPinOutput_writeLow(pin);
return true;
}
return false;
}
static void unselect_row(uint8_t row) {
pin_t pin = row_pins[row];
if (pin != NO_PIN) {
setPinInputHigh_atomic(pin);
}
}
static void unselect_rows(void) {
for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
unselect_row(x);
}
}
__attribute__((weak)) void matrix_init_custom(void) {
unselect_rows();
for (uint8_t x = 0; x < MATRIX_COLS; x++) {
if (col_pins[x] != NO_PIN) {
setPinInputHigh_atomic(col_pins[x]);
}
}
setPinInputHigh_atomic(F7);
setPinInputHigh_atomic(F0);
}
void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
// Start with a clear matrix row
matrix_row_t current_row_value = 0;
if (!select_row(current_row)) { // Select row
return; // skip NO_PIN row
}
matrix_output_select_delay();
// For each col...
matrix_row_t row_shifter = MATRIX_ROW_SHIFTER;
for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++, row_shifter <<= 1) {
uint8_t pin_state = 0;
if (current_row == 3 && col_index == 0) {
pin_state = !readMatrixPin(F7);
} else if (current_row == 3 && col_index == 3) {
pin_state = !readMatrixPin(F0);
} else {
pin_state = readMatrixPin(col_pins[col_index]);
}
// Populate the matrix row with the state of the col pin
current_row_value |= pin_state ? 0 : row_shifter;
}
// Unselect row
unselect_row(current_row);
matrix_output_unselect_delay(current_row, current_row_value != 0); // wait for all Col signals to go HIGH
// Update the matrix
current_matrix[current_row] = current_row_value;
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
static matrix_row_t temp_matrix[MATRIX_ROWS] = {0};
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
matrix_read_cols_on_row(temp_matrix, current_row);
}
bool changed = memcmp(current_matrix, temp_matrix, sizeof(temp_matrix)) != 0;
if (changed) {
memcpy(current_matrix, temp_matrix, sizeof(temp_matrix));
}
return changed;
}
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