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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"
#include "backlight.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#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 uint16_t read_inputs(void);
static void init_inputs(void);
static void init_outputs(void);
static void reset_inputs(void);
static void reset_outputs(void);
static void select_output(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)
{
backlight_init_ports();
init_inputs();
init_outputs();
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++) {
reset_inputs();
reset_outputs();
select_output(col);
_delay_us(3);
uint16_t rows = read_inputs();
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);
if (debouncing) {
dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
}
debouncing = DEBOUNCE;
}
}
}
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++) {
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;
}
static void init_inputs(void)
{
DDRE &= ~0b01000000; // PE6 (Col 0)
DDRB &= ~0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4)
DDRF &= ~0b00000001; // PF0 (Col 5)
DDRD &= ~0b00100001; // PD0 (Col 6), PD5 (Col 7)
}
static uint16_t read_inputs(void)
{
return (PINE&(1<<6) ? 0 : (1<<0)) | // PE6 (Row 0)
(PINB&(1<<0) ? 0 : (1<<1)) | // PB0 (Row 1)
(PINB&(1<<1) ? 0 : (1<<2)) | // PB1 (Row 2)
(PINB&(1<<2) ? 0 : (1<<3)) | // PB2 (Row 3)
(PINB&(1<<3) ? 0 : (1<<4)) | // PB3 (Row 4)
(PINF&(1<<0) ? 0 : (1<<5)) | // PF0 (Row 5)
(PIND&(1<<0) ? 0 : (1<<6)) | // PD0 (Row 6)
(PIND&(1<<5) ? 0 : (1<<7)); // PD5 (Row 7)
}
static void reset_inputs(void)
{
PORTE |= 0b01000000; // PE6 (Col 0)
PORTB |= 0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4)
PORTF |= 0b00000001; // PF0 (Col 5)
PORTD |= 0b00100001; // PD0 (Col 6), PD5 (Col 7)
}
static void init_outputs(void)
{
DDRB |= 0b00010000; // PB4 (Row 0)
DDRE |= 0b00000100; // PE2 (Row 1)
DDRF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7)
DDRC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9)
DDRD |= 0b10000000; // PD7 (Row 8)
}
static void reset_outputs(void)
{
PORTB |= 0b00010000; // PB4 (Row 0)
PORTE |= 0b00000100; // PE2 (Row 1)
PORTF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7)
PORTC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9)
PORTD |= 0b10000000; // PD7 (Row 8)
}
static void select_output(uint8_t col)
{
switch (col) {
case 0:
PORTB &= ~(1<<4);
break;
case 1:
PORTE &= ~(1<<2);
break;
case 2:
PORTF &= ~(1<<4);
break;
case 3:
PORTF &= ~(1<<7);
break;
case 4:
PORTF &= ~(1<<1);
break;
case 5:
PORTF &= ~(1<<6);
break;
case 6:
PORTC &= ~(1<<6);
break;
case 7:
PORTF &= ~(1<<5);
break;
case 8:
PORTD &= ~(1<<7);
break;
case 9:
PORTC &= ~(1<<7);
break;
}
}
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