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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 "gpio.h"
#include "eventqueue.h"
#define GPIO_PIN PINE
#define GPIO_PORT PORTE
#define GPIO_DDR DDRE
#define GPIO_INPUT_LP_CNT_MAX 200
static struct {
uint8_t last_sent;
int16_t lp_cnt;
} gpio_input_state[GPIO_NUM_INPUTS];
void gpio_init(void)
{
GPIO_DDR = 0x0F;
GPIO_PORT = 0xF0;
uint8_t i;
for(i = 0; i < GPIO_NUM_INPUTS; ++i) {
gpio_input_state[i].last_sent = 0;
gpio_input_state[i].lp_cnt = 0;
}
}
void gpio_out_on(uint8_t num)
{
if(num < GPIO_NUM_OUTPUTS)
GPIO_PORT |= (1 << num);
else
GPIO_PORT |= 0x0F;
}
void gpio_out_off(uint8_t num)
{
if(num < GPIO_NUM_OUTPUTS)
GPIO_PORT &= ~(1 << num);
else
GPIO_PORT &= 0xF0;
}
void gpio_out_toggle(uint8_t num)
{
if(num < GPIO_NUM_OUTPUTS)
GPIO_PORT ^= (1 << num);
else
GPIO_PORT ^= 0x0F;
}
void gpio_task(void)
{
uint8_t i;
for(i = 0; i < GPIO_NUM_INPUTS; ++i) {
uint8_t current_state = GPIO_PIN & (1<<(i+4));
gpio_input_state[i].lp_cnt += current_state ? -1 : +1;
if(gpio_input_state[i].lp_cnt <= 0 ||
gpio_input_state[i].lp_cnt >= GPIO_INPUT_LP_CNT_MAX) {
gpio_input_state[i].lp_cnt = gpio_input_state[i].lp_cnt <= 0 ? 0 : GPIO_INPUT_LP_CNT_MAX;
if(current_state != gpio_input_state[i].last_sent) {
gpio_input_state[i].last_sent = current_state;
eventqueue_push(GPIO_MIDI_NOTE_OFFSET + i, ((current_state) ? 0 : 1));
}
}
}
}
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