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#define F_CPU 16000000UL
#include <util/delay.h>
#include <avr/io.h>
#include <stdlib.h>
#include "uno-matrix.h"
#define debug(X) NULL
#define debug_hex(X) NULL
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static matrix_row_t read_cols(void);
static void init_cols(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
inline
uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
void matrix_init(void)
{
//debug_enable = true;
//debug_matrix = true;
//debug_mouse = true;
// initialize row and col
unselect_rows();
init_cols();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
}
uint8_t matrix_scan(void)
{
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
select_row(i);
_delay_us(30); // without this wait read unstable value.
matrix_row_t cols = read_cols();
//Serial.println(cols, BIN);
if (matrix_debouncing[i] != cols) {
matrix_debouncing[i] = cols;
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); debug("\n");
}
debouncing = DEBOUNCE;
}
unselect_rows();
}
if (debouncing) {
if (--debouncing) {
_delay_ms(1);
} else {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
return 1;
}
bool matrix_is_modified(void)
{
if (debouncing) return false;
return true;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & ((matrix_row_t)1<<col));
}
inline
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
// TODO update this comment
/* Column pin configuration
* col: 0 1 2 3 4 5
* pin: D3 D4 D5 D6 D7 B0
*/
static void init_cols(void)
{
// Input with pull-up(DDR:0, PORT:1)
DDRD &= ~(1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
PORTD |= (1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
DDRB &= ~(1<<0);
PORTB |= (1<<0);
}
static matrix_row_t read_cols(void)
{
return (PIND&(1<<3) ? 0 : (1<<0)) |
(PIND&(1<<4) ? 0 : (1<<1)) |
(PIND&(1<<5) ? 0 : (1<<2)) |
(PIND&(1<<6) ? 0 : (1<<3)) |
(PIND&(1<<7) ? 0 : (1<<4)) |
(PINB&(1<<0) ? 0 : (1<<5));
}
/* Row pin configuration
* row: 0 1 2 3
* pin: C0 C1 C2 C3
*/
static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
DDRC &= ~0xF;
PORTC &= ~0xF;
}
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
switch (row) {
case 0:
DDRC |= (1<<0);
PORTC &= ~(1<<0);
break;
case 1:
DDRC |= (1<<1);
PORTC &= ~(1<<1);
break;
case 2:
DDRC |= (1<<2);
PORTC &= ~(1<<2);
break;
case 3:
DDRC |= (1<<3);
PORTC &= ~(1<<3);
break;
}
}
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