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#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#ifndef DEBOUNCING_DELAY
# define DEBOUNCING_DELAY 5
#endif
static uint8_t debouncing = DEBOUNCING_DELAY;
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static uint8_t read_rows(void);
static void init_rows(void);
static void unselect_cols(void);
static void select_col(uint8_t col);
inline uint8_t matrix_rows(void) {
return MATRIX_ROWS;
}
inline uint8_t matrix_cols(void) {
return MATRIX_COLS;
}
void matrix_init(void) {
// initialize row and col
unselect_cols();
init_rows();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
matrix_init_quantum();
}
uint8_t matrix_scan(void) {
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
select_col(col);
_delay_us(3);
uint8_t rows = read_rows();
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
bool curr_bit = rows & (1<<row);
if (prev_bit != curr_bit) {
matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
debouncing = DEBOUNCING_DELAY;
}
}
unselect_cols();
}
if (debouncing) {
if (--debouncing) {
_delay_ms(1);
} else {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
matrix_scan_quantum();
return 1;
}
bool matrix_is_modified(void) {
if (debouncing)
return false;
else
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];
}
void matrix_print(void) {
print("\nr/c 0123456789ABCDEF\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
}
}
uint8_t matrix_key_count(void) {
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
count += bitpop32(matrix[i]);
}
return count;
}
/* Row pin configuration
*
* row: 0 1 2 3 4 5
* pin: C7 B1 B2 C6 B4 B5
*
*/
static void init_rows(void)
{
DDRC &= ~0b11000000;
DDRB &= ~0b00110110;
PORTC |= 0b11000000;
PORTB |= 0b00110110;
}
static uint8_t read_rows(void) {
return (PINC&(1<<PC7) ? 0 : (1<<0)) |
(PINB&(1<<PB1) ? 0 : (1<<1)) |
(PINB&(1<<PB2) ? 0 : (1<<2)) |
(PINC&(1<<PC6) ? 0 : (1<<3)) |
(PINB&(1<<PB4) ? 0 : (1<<4)) |
(PINB&(1<<PB5) ? 0 : (1<<5));
}
/* Row pin configuration
* pin: D3 D7 D6 D5 D4
* row: off 0 x x x x
* 0 1 0 0 0 0
* 1 1 0 0 0 1
* 2 1 0 0 1 0
* 3 1 0 0 1 1
* 4 1 0 1 0 0
* 5 1 0 1 0 1
* 6 1 0 1 1 0
* 7 1 0 1 1 1
* 8 1 1 0 0 0
* 9 1 1 0 0 1
* 10 1 1 0 1 0
* 11 1 1 0 1 1
* 12 1 1 1 0 0
* 13 1 1 1 0 1
* 14 1 1 1 1 0
* 15 1 1 1 1 1
*/
static void unselect_cols(void)
{
// output high(DDR:1, PORT:1) to unselect
DDRB |= (1 << PD3);
PORTB |= (1 << PD3);
}
static void select_col(uint8_t col) {
DDRD |= (1<<PD3 | 1<<PD4 | 1<<PD5 | 1<<PD6 | 1<<PD7);
PORTD &= ~(1<<PD3);
if (col & (1<<0)) {
PORTD |= (1<<PD4);
}
else {
PORTD &= ~(1<<PD4);
}
if (col & (1<<1)) {
PORTD |= (1<<PD5);
}
else {
PORTD &= ~(1<<PD5);
}
if (col & (1<<2)) {
PORTD |= (1<<PD6);
}
else {
PORTD &= ~(1<<PD6);
}
if (col & (1<<3)) {
PORTD |= (1<<PD7);
}
else {
PORTD &= ~(1<<PD7);
}
}
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