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#include <string.h>
#include "config.h"
#include "matrix.h"
#include "timer.h"
#include "quantum.h"
#ifndef DEBOUNCING_DELAY
# define DEBOUNCING_DELAY 5
#endif
//Debouncing counters
typedef uint8_t debounce_counter_t;
#define DEBOUNCE_COUNTER_MODULO 250
#define DEBOUNCE_COUNTER_INACTIVE 251
static debounce_counter_t *debounce_counters;
void debounce_init(uint8_t num_rows)
{
debounce_counters = malloc(num_rows*MATRIX_COLS);
memset(debounce_counters, DEBOUNCE_COUNTER_INACTIVE, num_rows*MATRIX_COLS);
}
void update_debounce_counters(uint8_t num_rows, uint8_t current_time)
{
for (uint8_t row = 0; row < num_rows; row++)
{
for (uint8_t col = 0; col < MATRIX_COLS; col++)
{
if (debounce_counters[row*MATRIX_COLS + col] != DEBOUNCE_COUNTER_INACTIVE)
{
if (TIMER_DIFF(current_time, debounce_counters[row*MATRIX_COLS + col], DEBOUNCE_COUNTER_MODULO) >= DEBOUNCING_DELAY) {
debounce_counters[row*MATRIX_COLS + col] = DEBOUNCE_COUNTER_INACTIVE;
}
}
}
}
}
void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time)
{
for (uint8_t row = 0; row < num_rows; row++)
{
matrix_row_t delta = raw[row] ^ cooked[row];
for (uint8_t col = 0; col < MATRIX_COLS; col++)
{
if (debounce_counters[row*MATRIX_COLS + col] == DEBOUNCE_COUNTER_INACTIVE && (delta & (1<<col)))
{
debounce_counters[row*MATRIX_COLS + col] = current_time;
cooked[row] ^= (1 << col);
}
}
}
}
void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed)
{
uint8_t current_time = timer_read() % DEBOUNCE_COUNTER_MODULO;
update_debounce_counters(num_rows, current_time);
transfer_matrix_values(raw, cooked, num_rows, current_time);
}
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