2 Copyright 2017 Priyadi Iman Nurcahyo
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
12 You should have received a copy of the GNU General Public License
13 along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #include <avr/interrupt.h>
19 #include <fauxclicky.h>
21 #include <musical_notes.h>
23 bool fauxclicky_enabled
= true;
24 uint16_t note_start
= 0;
25 bool note_playing
= false;
26 uint16_t note_period
= 0;
28 void fauxclicky_init() {
29 // Set port PC6 (OC3A and /OC4A) as output
32 // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
33 TCCR3A
= (0 << COM3A1
) | (0 << COM3A0
) | (1 << WGM31
) | (0 << WGM30
);
34 TCCR3B
= (1 << WGM33
) | (1 << WGM32
) | (0 << CS32
) | (1 << CS31
) | (0 << CS30
);
37 void fauxclicky_stop() {
38 FAUXCLICKY_DISABLE_OUTPUT
;
42 void fauxclicky_play(float note
[]) {
43 if (!fauxclicky_enabled
) return;
44 if (note_playing
) fauxclicky_stop();
45 FAUXCLICKY_TIMER_PERIOD
= (uint16_t)(((float)F_CPU
) / (note
[0] * (float)FAUXCLICKY_CPU_PRESCALER
));
46 FAUXCLICKY_DUTY_CYCLE
= (uint16_t)((((float)F_CPU
) / (note
[0] * (float)FAUXCLICKY_CPU_PRESCALER
)) / (float)2);
48 note_period
= (note
[1] / (float)16) * ((float)60 / (float)FAUXCLICKY_TEMPO
) * 1000;
49 note_start
= timer_read();
50 FAUXCLICKY_ENABLE_OUTPUT
;
53 void fauxclicky_check() {
54 if (!note_playing
) return;
56 if (timer_elapsed(note_start
) > note_period
) {