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/*
* rhmidi
*
* Copyright (C) 2014 Christian Pointner <equinox@helsinki.at>
*
* This file is part of rhmidi.
*
* rhmidi 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 3 of the License, or
* any later version.
*
* rhmidi 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 rhmidi. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <util/delay.h>
#include "keypad.h"
#include "eventqueue.h"
#define KEYPAD_PIN PINA
#define KEYPAD_PORT PORTA
#define KEYPAD_DDR DDRA
#define KEYPAD_NUM_COLS 4
#define KEYPAD_NUM_ROWS 4
#define KEYPAD_NUM_KEYS KEYPAD_NUM_COLS * KEYPAD_NUM_ROWS
#define KEYPAD_LP_CNT_MAX 200
static struct {
uint8_t last_sent;
int16_t lp_cnt;
} keypad_state[KEYPAD_NUM_KEYS];
void keypad_init(void)
{
KEYPAD_DDR = 0x00;
KEYPAD_PORT = 0x0F;
uint8_t i;
for(i = 0; i < KEYPAD_NUM_KEYS; ++i) {
keypad_state[i].last_sent = 0;
keypad_state[i].lp_cnt = 0;
}
DDRC = 0xFF;
DDRB |= 0xF0;
DDRD |= 0xF0;
PORTC = 0x00;
PORTB &= 0x0F;
PORTD &= 0x0F;
}
void keypad_led_on(uint8_t led)
{
switch(led) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7: PORTC |= (1 << led); break;
case 8:
case 9:
case 10:
case 11: PORTB |= (1 << (led - 8 + 4)); break;
case 12:
case 13:
case 14:
case 15: PORTD |= (1 << (led - 12 + 4)); break;
case 127: PORTC = 0xFF; PORTB |= 0xF0; PORTD |= 0xF0; break;
}
}
void keypad_led_off(uint8_t led)
{
switch(led) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7: PORTC &= ~(1 << led); break;
case 8:
case 9:
case 10:
case 11: PORTB &= ~(1 << (led - 8 + 4)); break;
case 12:
case 13:
case 14:
case 15: PORTD &= ~(1 << (led - 12 + 4)); break;
case 127: PORTC = 0x00; PORTB &= 0x0F; PORTD &= 0x0F; break;
}
}
void keypad_led_toggle(uint8_t led)
{
switch(led) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7: PORTC ^= (1 << led); break;
case 8:
case 9:
case 10:
case 11: PORTB ^= (1 << (led - 8 + 4)); break;
case 12:
case 13:
case 14:
case 15: PORTD ^= (1 << (led - 12 + 4)); break;
case 127: PORTC ^= 0xFF; PORTB ^= 0xF0; PORTD ^= 0xF0; break;
}
}
static void keypad_key_lowpass(uint8_t key_idx, uint8_t current_state)
{
keypad_state[key_idx].lp_cnt += current_state ? -1 : +1;
if(keypad_state[key_idx].lp_cnt <= 0 ||
keypad_state[key_idx].lp_cnt >= KEYPAD_LP_CNT_MAX) {
keypad_state[key_idx].lp_cnt = keypad_state[key_idx].lp_cnt <= 0 ? 0 : KEYPAD_LP_CNT_MAX;
if(current_state != keypad_state[key_idx].last_sent) {
keypad_state[key_idx].last_sent = current_state;
if(current_state) {
eventqueue_push(key_idx, 0);
} else {
eventqueue_push(key_idx, 1);
}
}
}
}
void keypad_task(void)
{
uint8_t col, row;
for(col = 0; col < KEYPAD_NUM_COLS; ++col) {
KEYPAD_DDR = 1 << (col + 4);
KEYPAD_PORT = 0x0F;
_delay_us(10);
for(row = 0; row < KEYPAD_NUM_ROWS; ++row) {
uint8_t key_idx = col*KEYPAD_NUM_ROWS + row;
uint8_t current_state = KEYPAD_PIN & (1 << row);
keypad_key_lowpass(key_idx, current_state);
}
}
KEYPAD_DDR = 0x00;
}
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