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#include <stdint.h>
#include <stdbool.h>
#include "gpio_api.h"
#include "timer.h"
#include "wait.h"
#include "matrix.h"
#ifndef DEBOUNCE
#define DEBOUNCE 5
#endif
/*
* Infinity Pinusage:
* Column pins are input with internal pull-down. Row pins are output and strobe with high.
* Key is high or 1 when it turns on.
*
* col: { PTD1, PTD2, PTD3, PTD4, PTD5, PTD6, PTD7 }
* row: { PTB0, PTB1, PTB2, PTB3, PTB16, PTB17, PTC4, PTC5, PTD0 }
*/
static gpio_t col[MATRIX_COLS];
static gpio_t row[MATRIX_ROWS];
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static bool debouncing = false;
static uint16_t debouncing_time = 0;
void matrix_init(void)
{
/* Column(sense) */
gpio_init_in_ex(&col[0], PTD1, PullDown);
gpio_init_in_ex(&col[1], PTD2, PullDown);
gpio_init_in_ex(&col[2], PTD3, PullDown);
gpio_init_in_ex(&col[3], PTD4, PullDown);
gpio_init_in_ex(&col[4], PTD5, PullDown);
gpio_init_in_ex(&col[5], PTD6, PullDown);
gpio_init_in_ex(&col[6], PTD7, PullDown);
/* Row(strobe) */
gpio_init_out_ex(&row[0], PTB0, 0);
gpio_init_out_ex(&row[1], PTB1, 0);
gpio_init_out_ex(&row[2], PTB2, 0);
gpio_init_out_ex(&row[3], PTB3, 0);
gpio_init_out_ex(&row[4], PTB16, 0);
gpio_init_out_ex(&row[5], PTB17, 0);
gpio_init_out_ex(&row[6], PTC4, 0);
gpio_init_out_ex(&row[7], PTC5, 0);
gpio_init_out_ex(&row[8], PTD0, 0);
}
uint8_t matrix_scan(void)
{
for (int i = 0; i < MATRIX_ROWS; i++) {
matrix_row_t r = 0;
gpio_write(&row[i], 1);
wait_us(1); // need wait to settle pin state
for (int j = 0; j < MATRIX_COLS; j++) {
if (gpio_read(&col[j])) {
r |= (1<<j);
}
}
gpio_write(&row[i], 0);
if (matrix_debouncing[i] != r) {
matrix_debouncing[i] = r;
debouncing = true;
debouncing_time = timer_read();
}
}
if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
for (int i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
debouncing = false;
}
/*
if (debouncing) {
if (--debouncing) {
return 0;
} else {
for (int i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
*/
return 1;
}
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & (1<<col));
}
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
void matrix_print(void)
{
}
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