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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 DEBOUNCING_DELAY
# define DEBOUNCING_DELAY 5
#endif
static uint8_t debouncing = DEBOUNCING_DELAY;
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static uint8_t read_rows(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;
}
/* Column pin configuration
*
* col: 0 1 2 3 4 5 6 7
* pin: PC7 PD5 PD3 PD1 PC2 PD6 PD4 PD2
*
* Rrr pin configuration
*
* These rrrs uses one 74HC154 4 to 16 bit demultiplexer (low
* active), together with 2 rrrs driven directly from the micro
* controller, to control the 18 rrrs. The rrrs are driven from
* pins B6,5,4,3,2,1,0.
*/
void matrix_init(void) {
DDRC &= ~0b10000100; // Row input pins
DDRD &= ~0b01111110;
PORTC |= 0b10000100;
PORTD |= 0b01111110;
DDRB |= 0b01111111; // Column output pins
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 = DEBOUNCING_DELAY;
}
}
}
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;
else
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;
}
static uint8_t read_rows(void) {
return
(PINC&(1<<7) ? 0 : (1<<0)) |
(PIND&(1<<5) ? 0 : (1<<1)) |
(PIND&(1<<3) ? 0 : (1<<2)) |
(PIND&(1<<1) ? 0 : (1<<3)) |
(PINC&(1<<2) ? 0 : (1<<4)) |
(PIND&(1<<2) ? 0 : (1<<5)) |
(PIND&(1<<4) ? 0 : (1<<6)) |
(PIND&(1<<6) ? 0 : (1<<7));
}
static void select_col(uint8_t col) {
switch (col) {
case 0: PORTB = (PORTB & ~0b01111111) | 0b01100100; break;
case 1: PORTB = (PORTB & ~0b01111111) | 0b01101100; break;
case 2: PORTB = (PORTB & ~0b01111111) | 0b01100010; break;
case 3: PORTB = (PORTB & ~0b01111111) | 0b01111010; break;
case 4: PORTB = (PORTB & ~0b01111111) | 0b01100110; break;
case 5: PORTB = (PORTB & ~0b01111111) | 0b01110110; break;
case 6: PORTB = (PORTB & ~0b01111111) | 0b01101110; break;
case 7: PORTB = (PORTB & ~0b01111111) | 0b01111110; break;
case 8: PORTB = (PORTB & ~0b01111111) | 0b01000001; break;
case 9: PORTB = (PORTB & ~0b01111111) | 0b00100001; break;
case 10: PORTB = (PORTB & ~0b01111111) | 0b01101010; break;
case 11: PORTB = (PORTB & ~0b01111111) | 0b01110010; break;
case 12: PORTB = (PORTB & ~0b01111111) | 0b01111100; break;
case 13: PORTB = (PORTB & ~0b01111111) | 0b01110100; break;
case 14: PORTB = (PORTB & ~0b01111111) | 0b01111000; break;
case 15: PORTB = (PORTB & ~0b01111111) | 0b01110000; break;
case 16: PORTB = (PORTB & ~0b01111111) | 0b01100000; break;
case 17: PORTB = (PORTB & ~0b01111111) | 0b01101000; break;
}
}
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