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/*
Copyright 2011 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"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;
// bit array of key state(1:on, 0:off)
static matrix_row_t *matrix;
static matrix_row_t *matrix_debounced;
static matrix_row_t _matrix0[MATRIX_ROWS];
static matrix_row_t _matrix1[MATRIX_ROWS];
#define NROW 18
#define NCOL 8
#define _DDRA (uint8_t *const)&DDRA
#define _DDRB (uint8_t *const)&DDRB
#define _DDRC (uint8_t *const)&DDRC
#define _DDRD (uint8_t *const)&DDRD
#define _DDRE (uint8_t *const)&DDRE
#define _DDRF (uint8_t *const)&DDRF
#define _PINA (uint8_t *const)&PINA
#define _PINB (uint8_t *const)&PINB
#define _PINC (uint8_t *const)&PINC
#define _PIND (uint8_t *const)&PIND
#define _PINE (uint8_t *const)&PINE
#define _PINF (uint8_t *const)&PINF
#define _PORTA (uint8_t *const)&PORTA
#define _PORTB (uint8_t *const)&PORTB
#define _PORTC (uint8_t *const)&PORTC
#define _PORTD (uint8_t *const)&PORTD
#define _PORTE (uint8_t *const)&PORTE
#define _PORTF (uint8_t *const)&PORTF
#define _BIT0 0x01
#define _BIT1 0x02
#define _BIT2 0x04
#define _BIT3 0x08
#define _BIT4 0x10
#define _BIT5 0x20
#define _BIT6 0x40
#define _BIT7 0x80
/* Specifies the ports and pin numbers for the rows */
static
uint8_t *const row_ddr[NROW] = { _DDRB, _DDRB,
_DDRC, _DDRC,
_DDRD, _DDRD, _DDRD, _DDRD, _DDRD, _DDRD, _DDRD, _DDRD,
_DDRF, _DDRF, _DDRF, _DDRF, _DDRF, _DDRF};
static
uint8_t *const row_port[NROW] = { _PORTB, _PORTB,
_PORTC, _PORTC,
_PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD, _PORTD,
_PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF};
static
uint8_t *const row_pin[NROW] = { _PINB, _PINB,
_PINC, _PINC,
_PIND, _PIND, _PIND, _PIND, _PIND, _PIND, _PIND, _PIND,
_PINF, _PINF, _PINF, _PINF, _PINF, _PINF};
static
const uint8_t row_bit[NROW] = { _BIT4, _BIT7,
_BIT6, _BIT7,
_BIT0, _BIT1, _BIT2, _BIT3, _BIT4, _BIT5, _BIT6, _BIT7,
_BIT0, _BIT1, _BIT4, _BIT5, _BIT6, _BIT7};
static
const uint8_t mask = 0x0E;
/* Specifies the ports and pin numbers for the columns */
static
const uint8_t col_bit[NCOL] = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0A, 0x0C, 0x0E};
static
inline void pull_column(int col) {
PORTB = col_bit[col] | (PORTB & ~mask);
}
static
inline void release_column(int col) {
}
/* PORTB is set as input with pull-up resistors
PORTC,D,E,F are set to high output */
static
void setup_io_pins(void) {
uint8_t row;
DDRB |= 0x0E;
PORTB &= ~0x0E;
for(row = 0; row < NROW; row++) {
*row_ddr[row] &= ~row_bit[row];
*row_port[row] &= ~row_bit[row];
}
}
static
void setup_leds(void) {
DDRB |= 0x60;
PORTB |= 0x60;
}
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
setup_io_pins();
setup_leds();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
matrix = _matrix0;
matrix_debounced = _matrix1;
}
uint8_t matrix_scan(void)
{
if (!debouncing) {
uint8_t *tmp = matrix_debounced;
matrix_debounced = matrix;
matrix = tmp;
}
for (uint8_t col = 0; col < NCOL; col++) { // 0-7
pull_column(col); // output hi on theline
_delay_us(1); // without this wait it won't read stable value.
for (uint8_t row = 0; row < NROW; row++) { // 0-17
bool prev_bit = matrix[row] & (1<<col);
bool curr_bit = *row_pin[row] & row_bit[row];
if (prev_bit != curr_bit) {
matrix[row] ^= (1<<col);
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); print("\n");
}
debouncing = DEBOUNCE;
}
}
release_column(col);
}
if (debouncing) {
debouncing--;
}
return 1;
}
bool matrix_is_modified(void)
{
// NOTE: no longer used
return true;
}
inline
bool matrix_has_ghost(void)
{
return false;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix_debounced[row] & (1<<col));
}
inline
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix_debounced[row];
}
void matrix_print(void)
{
print("\nr/c 01234567\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
phex(row); print(": ");
pbin_reverse(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++) {
for (uint8_t j = 0; j < MATRIX_COLS; j++) {
if (matrix_is_on(i, j))
count++;
}
}
return count;
}
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