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/*
Copyright 2017 Priyadi Iman Nurcahyo
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 <avr/interrupt.h>
#include <avr/io.h>
#include <timer.h>
#include <fauxclicky.h>
#include <stdbool.h>
#include <musical_notes.h>
bool fauxclicky_enabled = true;
uint16_t note_start = 0;
bool note_playing = false;
uint16_t note_period = 0;
void fauxclicky_init() {
// Set port PC6 (OC3A and /OC4A) as output
DDRC |= _BV(PORTC6);
// TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
}
void fauxclicky_stop() {
FAUXCLICKY_DISABLE_OUTPUT;
note_playing = false;
}
void fauxclicky_play(float note[]) {
if (!fauxclicky_enabled) return;
if (note_playing) fauxclicky_stop();
FAUXCLICKY_TIMER_PERIOD = (uint16_t)(((float)F_CPU) / (note[0] * (float)FAUXCLICKY_CPU_PRESCALER));
FAUXCLICKY_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (note[0] * (float)FAUXCLICKY_CPU_PRESCALER)) / (float)2);
note_playing = true;
note_period = (note[1] / (float)16) * ((float)60 / (float)FAUXCLICKY_TEMPO) * 1000;
note_start = timer_read();
FAUXCLICKY_ENABLE_OUTPUT;
}
void fauxclicky_check() {
if (!note_playing) return;
if (timer_elapsed(note_start) > note_period) {
fauxclicky_stop();
}
}
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