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/*
Copyright 2014 Kai Ryu <kai1103@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"
#ifdef UART_RGB_ENABLE
#include "uart_rgb.h"
#endif
#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 matrix_row_t read_cols(void);
static void init_cols(void);
static void init_rows(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)
{
#ifdef UART_RGB_ENABLE
uart_rgb_init();
#endif
// disable JTAG
MCUCR = _BV(JTD);
MCUCR = _BV(JTD);
// 85 REST
DDRD |= _BV(PD7);
PORTD |= _BV(PD7);
// initialize row and col
init_rows();
init_cols();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
}
uint8_t matrix_scan(void)
{
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
select_row(i);
_delay_us(30); // without this wait read unstable value.
matrix_row_t cols = read_cols();
if (matrix_debouncing[i] != cols) {
matrix_debouncing[i] = cols;
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); debug("\n");
}
debouncing = DEBOUNCE;
}
unselect_rows();
}
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;
}
/* Column pin configuration
* col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
* pin: F7 F6 F5 F4 F1 F0 E6 D7 D6 D5 D1 D0 B7 B6 B0 C7
* */
static void init_cols(void)
{
// Input with pull-up(DDR:0, PORT:1)
DDRF &= 0b00001100;
PORTF |= 0b11110011;
DDRD &= 0b00011100;
PORTD |= 0b11100011;
DDRB &= ~(_BV(PB6) | _BV(PB7)| _BV(PB0));
PORTB |= (_BV(PB6) | _BV(PB7)| _BV(PB0));
DDRE &= ~_BV(PE6);
PORTE |= _BV(PE6);
DDRC &= ~_BV(PC7);
PORTC |= _BV(PC7);
}
static matrix_row_t read_cols(void)
{
return (PINF&_BV(PF7) ? 0 : (1<<0)) |
(PINF&_BV(PF6) ? 0 : (1<<1)) |
(PINF&_BV(PF5) ? 0 : (1<<2)) |
(PINF&_BV(PF4) ? 0 : (1<<3)) |
(PINF&_BV(PF1) ? 0 : (1<<4)) |
(PINF&_BV(PF0) ? 0 : (1<<5)) |
(PINE&_BV(PE6) ? 0 : (1<<6)) |
(PIND&_BV(PD7) ? 0 : (1<<7)) |
(PIND&_BV(PD6) ? 0 : (1<<8)) |
(PIND&_BV(PD5) ? 0 : (1<<9)) |
(PIND&_BV(PD1) ? 0 : (1<<10)) |
(PIND&_BV(PD0) ? 0 : (1<<11)) |
(PINB&_BV(PB7) ? 0 : (1<<12)) |
(PINB&_BV(PB6) ? 0 : (1<<13)) |
(PINB&_BV(PB0) ? 0 : (1<<14)) |
(PINC&_BV(PC7) ? 0 : (1<<15));
}
/* Row pin configuration
* row: 0 1 2 3 4 5 x
* pin: B3 0 1 0 1 0 1 1
* B2 0 0 1 1 0 0 1
* B1 0 0 0 0 1 1 1
*/
static void init_rows(void)
{
DDRB |= (1<<PB1 | 1<<PB2 | 1<<PB3);
}
static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
PORTB |= (1<<PB1);
PORTB |= (1<<PB2);
PORTB |= (1<<PB3);
}
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
(row & (1<<0)) ? (PORTB |= (1<<PB3)) : (PORTB &= ~(1<<PB3));
(row & (1<<1)) ? (PORTB |= (1<<PB2)) : (PORTB &= ~(1<<PB2));
(row & (1<<2)) ? (PORTB |= (1<<PB1)) : (PORTB &= ~(1<<PB1));
}
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