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/*
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/>.
*/
/*
* scan matrix
*/
#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 DEBOUNCE
# define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;
/* matrix state(1:on, 0:off) */
static uint16_t *matrix;
static uint16_t *matrix_debouncing;
static uint16_t matrix0[MATRIX_ROWS];
static uint16_t matrix1[MATRIX_ROWS];
static bool is_modified;
static uint16_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)
{
// initialize row and col
unselect_rows();
init_cols();
// initialize matrix state: all keys off
matrix = matrix0;
matrix_debouncing = matrix1;
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
is_modified = false;
}
uint8_t matrix_scan(void)
{
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
//unselect_rows();
select_row(i);
_delay_us(30); // without this wait read unstable value.
uint16_t cols = read_cols();
if (matrix_debouncing[i] != cols) {
matrix_debouncing[i] = cols;
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); debug("\n");
}
debouncing = DEBOUNCE;
is_modified = false;
}
unselect_rows();
}
//unselect_rows();
if (debouncing) {
debouncing--;
_delay_ms(1);
} else {
uint16_t *tmp = matrix;
matrix = matrix_debouncing;
matrix_debouncing = tmp;
is_modified = true;
}
return 1;
}
bool matrix_is_modified(void)
{
return is_modified;
}
inline
bool matrix_has_ghost(void)
{
return false;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & (1<<col));
}
inline
uint16_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++) {
phex(row); print(": ");
pbin_reverse16(matrix_get_row(row));
print("\n");
}
}
uint8_t matrix_key_count(void)
{
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
count += bitpop16(matrix[i]);
}
return count;
}
/* Column pin configuration
* col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
* pin: F0 F1 E6 C7 C6 B6 D4 B1 B0 B5 B4 D7 D6 B3
*/
static void init_cols(void)
{
// Input with pull-up(DDR:0, PORT:1)
DDRF &= ~(1<<0 | 1<<1);
PORTF |= (1<<0 | 1<<1);
DDRE &= ~(1<<6);
PORTE |= (1<<6);
DDRD &= ~(1<<7 | 1<<6 | 1<<4);
PORTD |= (1<<7 | 1<<6 | 1<<4);
DDRC &= ~(1<<7 | 1<<6);
PORTC |= (1<<7 | 1<<6);
DDRB &= ~(1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
PORTB |= (1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
}
static uint16_t read_cols(void)
{
return (PINF&(1<<0) ? 0 : (1<<0)) |
(PINF&(1<<1) ? 0 : (1<<1)) |
(PINE&(1<<6) ? 0 : (1<<2)) |
(PINC&(1<<7) ? 0 : (1<<3)) |
(PINC&(1<<6) ? 0 : (1<<4)) |
(PINB&(1<<6) ? 0 : (1<<5)) |
(PIND&(1<<4) ? 0 : (1<<6)) |
(PINB&(1<<1) ? 0 : (1<<7)) |
(PINB&(1<<0) ? 0 : (1<<8)) |
(PINB&(1<<5) ? 0 : (1<<9)) |
(PINB&(1<<4) ? 0 : (1<<10)) |
(PIND&(1<<7) ? 0 : (1<<11)) |
(PIND&(1<<6) ? 0 : (1<<12)) |
(PINB&(1<<3) ? 0 : (1<<13));
}
/* Row pin configuration
* row: 0 1 2 3 4
* pin: D0 D1 D2 D3 D5
*/
static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
DDRD &= ~0b00101111;
PORTD &= ~0b00101111;
}
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
switch (row) {
case 0:
DDRD |= (1<<0);
PORTD &= ~(1<<0);
break;
case 1:
DDRD |= (1<<1);
PORTD &= ~(1<<1);
break;
case 2:
DDRD |= (1<<2);
PORTD &= ~(1<<2);
break;
case 3:
DDRD |= (1<<3);
PORTD &= ~(1<<3);
break;
case 4:
DDRD |= (1<<5);
PORTD &= ~(1<<5);
break;
}
}
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