60 lines
2 KiB
C
60 lines
2 KiB
C
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/*
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Copyright 2017 Priyadi Iman Nurcahyo
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <timer.h>
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#include <fauxclicky.h>
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#include <stdbool.h>
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#include <musical_notes.h>
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bool fauxclicky_enabled = true;
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uint16_t note_start = 0;
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bool note_playing = false;
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uint16_t note_period = 0;
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void fauxclicky_init() {
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// Set port PC6 (OC3A and /OC4A) as output
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DDRC |= _BV(PORTC6);
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// TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
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TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
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TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30);
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}
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void fauxclicky_stop() {
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FAUXCLICKY_DISABLE_OUTPUT;
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note_playing = false;
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}
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void fauxclicky_play(float note[]) {
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if (!fauxclicky_enabled) return;
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if (note_playing) fauxclicky_stop();
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FAUXCLICKY_TIMER_PERIOD = (uint16_t)(((float)F_CPU) / (note[0] * (float)FAUXCLICKY_CPU_PRESCALER));
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FAUXCLICKY_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (note[0] * (float)FAUXCLICKY_CPU_PRESCALER)) / (float)2);
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note_playing = true;
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note_period = (note[1] / (float)16) * ((float)60 / (float)FAUXCLICKY_TEMPO) * 1000;
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note_start = timer_read();
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FAUXCLICKY_ENABLE_OUTPUT;
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}
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void fauxclicky_check() {
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if (!note_playing) return;
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if (timer_elapsed(note_start) > note_period) {
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fauxclicky_stop();
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}
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}
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