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/*
Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
Copyright 2016 Daniel Svensson <dsvensson@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static matrix_row_t read_cols(void);
static void select_row(uint8_t col);
__attribute__ ((weak))
void matrix_init_kb(void) {
matrix_init_user();
}
__attribute__ ((weak))
void matrix_scan_kb(void) {
matrix_scan_user();
}
__attribute__ ((weak))
void matrix_init_user(void) {
}
__attribute__ ((weak))
void matrix_scan_user(void) {
}
inline uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
void matrix_init(void)
{
/* Column output pins */
DDRD |= 0b01111011;
/* Row input pins */
DDRC &= (unsigned char) ~0b00000000;
DDRB &= (unsigned char) ~0b11111111;
PORTC |= 0b00000000;
PORTB |= 0b11111111;
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
matrix_init_kb();
}
uint8_t matrix_scan(void)
{
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
select_row(col);
wait_us(30);
matrix_row_t rows = read_cols();
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 = DEBOUNCE;
}
}
}
if (debouncing) {
if (--debouncing) {
wait_ms(1);
} else {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
matrix_scan_kb();
return 1;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return matrix[row] & 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++) {
print_hex8(row); print(": ");
print_bin_reverse16(matrix_get_row(row));
print("\n");
}
}
static matrix_row_t read_cols(void)
{
return
(PINB & (1 << 5) ? 0 : (matrix_row_t) 1 << 0) |
(PINB & (1 << 7) ? 0 : (matrix_row_t) 1 << 1) |
(PINB & (1 << 4) ? 0 : (matrix_row_t) 1 << 2) |
(PINB & (1 << 6) ? 0 : (matrix_row_t) 1 << 3) |
(PINB & (1 << 1) ? 0 : (matrix_row_t) 1 << 4) |
(PINB & (1 << 2) ? 0 : (matrix_row_t) 1 << 5) |
(PINB & (1 << 3) ? 0 : (matrix_row_t) 1 << 6) |
(PINB & (1 << 0) ? 0 : (matrix_row_t) 1 << 7);
}
static void select_row(uint8_t col)
{
switch (col) {
case 0:
PORTD = (PORTD & ~0b01111011) | 0b00010011;
break;
case 1:
PORTD = (PORTD & ~0b01111011) | 0b01000011;
break;
case 2:
PORTD = (PORTD & ~0b01111011) | 0b01100000;
break;
case 3:
PORTD = (PORTD & ~0b01111011) | 0b01111001;
break;
case 4:
PORTD = (PORTD & ~0b01111011) | 0b01100010;
break;
case 5:
PORTD = (PORTD & ~0b01111011) | 0b01101010;
break;
case 6:
PORTD = (PORTD & ~0b01111011) | 0b01110001;
break;
case 7:
PORTD = (PORTD & ~0b01111011) | 0b01101001;
break;
case 8:
PORTD = (PORTD & ~0b01111011) | 0b01100001;
break;
case 9:
PORTD = (PORTD & ~0b01111011) | 0b01111000;
break;
case 10:
PORTD = (PORTD & ~0b01111011) | 0b00011011;
break;
case 11:
PORTD = (PORTD & ~0b01111011) | 0b00100011;
break;
case 12:
PORTD = (PORTD & ~0b01111011) | 0b00101011;
break;
case 13:
PORTD = (PORTD & ~0b01111011) | 0b01110000;
break;
case 14:
PORTD = (PORTD & ~0b01111011) | 0b00001011;
break;
case 15:
PORTD = (PORTD & ~0b01111011) | 0b01101000;
break;
case 16:
PORTD = (PORTD & ~0b01111011) | 0b00000011;
break;
case 17:
PORTD = (PORTD & ~0b01111011) | 0b00111011;
break;
}
}
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