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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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