148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
/*
|
|
Copyright 2012 Jun Wako <wakojun@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 "print.h"
|
|
#include "debug.h"
|
|
#include "util.h"
|
|
#include "matrix.h"
|
|
|
|
|
|
/*
|
|
* Happy Buckling Keyboard(IBM Model M mod)
|
|
*
|
|
* Pin usage:
|
|
* COL: PD0-7
|
|
* ROW: PB0-7, PF4-7
|
|
*/
|
|
#ifndef DEBOUNCE
|
|
# define DEBOUNCE 10
|
|
#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 unselect_rows(void);
|
|
static void select_row(uint8_t row);
|
|
|
|
|
|
void matrix_init(void)
|
|
{
|
|
// JTAG disable for PORT F. write JTD bit twice within four cycles.
|
|
MCUCR |= (1<<JTD);
|
|
MCUCR |= (1<<JTD);
|
|
|
|
// initialize rows
|
|
unselect_rows();
|
|
|
|
// initialize columns to input with pull-up(DDR:0, PORT:1)
|
|
DDRD = 0x00;
|
|
PORTD = 0xFF;
|
|
|
|
// 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();
|
|
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;
|
|
}
|
|
|
|
inline
|
|
matrix_row_t matrix_get_row(uint8_t row)
|
|
{
|
|
return matrix[row];
|
|
}
|
|
|
|
inline
|
|
static matrix_row_t read_cols(void)
|
|
{
|
|
return ~PIND;
|
|
}
|
|
|
|
inline
|
|
static void unselect_rows(void)
|
|
{
|
|
// Hi-Z(DDR:0, PORT:0) to unselect
|
|
DDRB &= ~0b11111111;
|
|
PORTB &= ~0b11111111;
|
|
DDRF &= ~0b11110000;
|
|
PORTF &= ~0b11110000;
|
|
}
|
|
|
|
inline
|
|
static void select_row(uint8_t row)
|
|
{
|
|
// Output low(DDR:1, PORT:0) to select
|
|
switch (row) {
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
case 6:
|
|
case 7:
|
|
DDRB |= (1<<row);
|
|
PORTB &= ~(1<<row);
|
|
break;
|
|
case 8:
|
|
DDRF |= (1<<4);
|
|
PORTF &= ~(1<<4);
|
|
break;
|
|
case 9:
|
|
case 10:
|
|
case 11:
|
|
DDRF |= (1<<(row-4));
|
|
PORTF &= ~(1<<(row-4));
|
|
break;
|
|
}
|
|
}
|