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/*
Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
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"
#ifndef DEBOUNCE
# define DEBOUNCE 0
#endif
static uint8_t debouncing = DEBOUNCE;
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)
{
unselect_cols();
init_rows();
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
}
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 = DEBOUNCE;
}
}
unselect_cols();
}
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];
}
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 6 7
* pin: PC2 PB1 PB2 PB3 PC7 PB4 PB5 PB6
*
*/
static void init_rows(void)
{
DDRC &= ~0b10000100;
DDRB &= ~0b01111110;
PORTC |= 0b10000100;
PORTB |= 0b01111110;
}
static uint8_t read_rows(void)
{
return (PINC&(1<<2) ? 0 : (1<<0)) |
(PINB&(1<<1) ? 0 : (1<<1)) |
(PINB&(1<<2) ? 0 : (1<<2)) |
(PINB&(1<<3) ? 0 : (1<<3)) |
(PINC&(1<<7) ? 0 : (1<<4)) |
(PINB&(1<<4) ? 0 : (1<<5)) |
(PINB&(1<<5) ? 0 : (1<<6)) |
(PINB&(1<<6) ? 0 : (1<<7));
}
/* These columns uses two 74HC42 4 to 10 bit demultiplexers (low active).
*
* COL PD1 PD0 PD2 PD6 PD5 PD4
* 12 1 1 0 0 0 0
* 11 1 1 0 0 0 1
* 10 1 1 0 0 1 0
* 9 1 1 0 0 1 1
* 8 1 1 0 1 0 0
* 7 1 1 0 1 0 1
* 6 1 1 0 1 1 0
* 5 1 1 0 1 1 1
* 4 1 1 1 0 0 0
* 3 1 1 1 0 0 1
* COL PD2 PD6 PD1 PD0 PD5 PD4
* 2 1 1 0 0 0 0
* 1 1 1 0 0 0 1
* 0 1 1 0 0 1 0
* 17 1 1 0 0 1 1
* 16 1 1 0 1 0 0
* 1 1 0 1 0 1
* 1 1 0 1 1 0
* 15 1 1 0 1 1 1
* 14 1 1 1 0 0 0
* 13 1 1 1 0 0 1
*/
static void unselect_cols(void)
{
DDRD |= 0b01110111;
PORTD &= ~0b01110111;
}
static void select_col(uint8_t col)
{
switch (col) {
case 0:
PORTD |= (1<<5) | (1<<6) | (1<<2);
break;
case 1:
PORTD |= (1<<4) | (1<<6) | (1<<2);
break;
case 2:
PORTD |= (1<<6) | (1<<2);
break;
case 3:
PORTD |= (1<<4) | (1<<2) | (1<<0) | (1<<1);
break;
case 4:
PORTD |= (1<<2) | (1<<0) | (1<<1);
break;
case 5:
PORTD |= (1<<4) | (1<<5) | (1<<6) | (1<<0) | (1<<1);
break;
case 6:
PORTD |= (1<<5) | (1<<6) | (1<<0) | (1<<1);
break;
case 7:
PORTD |= (1<<4) | (1<<6) | (1<<0) | (1<<1);
break;
case 8:
PORTD |= (1<<6) | (1<<0) | (1<<1);
break;
case 9:
PORTD |= (1<<4) | (1<<5) | (1<<0) | (1<<1);
break;
case 10:
PORTD |= (1<<5) | (1<<0) | (1<<1);
break;
case 11:
PORTD |= (1<<4) | (1<<0) | (1<<1);
break;
case 12:
PORTD |= (1<<0) | (1<<1);
break;
case 13:
PORTD |= (1<<4) | (1<<1) | (1<<6) | (1<<2);
break;
case 14:
PORTD |= (1<<1) | (1<<6) | (1<<2);
break;
case 15:
PORTD |= (1<<4) | (1<<5) | (1<<0) | (1<<6) | (1<<2);
break;
case 16:
PORTD |= (1<<0) | (1<<6) | (1<<2);
break;
case 17:
PORTD |= (1<<4) | (1<<5) | (1<<6) | (1<<2);
break;
}
}
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