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c68e596f PIN |
1 | /* |
2 | Copyright 2017 Priyadi Iman Nurcahyo | |
3 | ||
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/>. | |
14 | */ | |
15 | ||
16 | #include <avr/interrupt.h> | |
17 | #include <avr/io.h> | |
18 | #include <timer.h> | |
19 | #include <fauxclicky.h> | |
20 | #include <stdbool.h> | |
21 | #include <musical_notes.h> | |
22 | ||
b624f32f | 23 | bool fauxclicky_enabled = true; |
24 | uint16_t note_start = 0; | |
25 | bool note_playing = false; | |
26 | uint16_t note_period = 0; | |
c68e596f | 27 | |
b624f32f | 28 | void fauxclicky_init() { |
c68e596f PIN |
29 | // Set port PC6 (OC3A and /OC4A) as output |
30 | DDRC |= _BV(PORTC6); | |
31 | ||
32 | // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers | |
33 | TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30); | |
b624f32f | 34 | TCCR3B = (1 << WGM33) | (1 << WGM32) | (0 << CS32) | (1 << CS31) | (0 << CS30); |
c68e596f PIN |
35 | } |
36 | ||
b624f32f | 37 | void fauxclicky_stop() { |
c68e596f PIN |
38 | FAUXCLICKY_DISABLE_OUTPUT; |
39 | note_playing = false; | |
40 | } | |
41 | ||
ffa4c72a | 42 | void fauxclicky_play(float note[]) { |
c68e596f PIN |
43 | if (!fauxclicky_enabled) return; |
44 | if (note_playing) fauxclicky_stop(); | |
ffa4c72a | 45 | FAUXCLICKY_TIMER_PERIOD = (uint16_t)(((float)F_CPU) / (note[0] * (float)FAUXCLICKY_CPU_PRESCALER)); |
b624f32f | 46 | FAUXCLICKY_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (note[0] * (float)FAUXCLICKY_CPU_PRESCALER)) / (float)2); |
47 | note_playing = true; | |
48 | note_period = (note[1] / (float)16) * ((float)60 / (float)FAUXCLICKY_TEMPO) * 1000; | |
49 | note_start = timer_read(); | |
c68e596f PIN |
50 | FAUXCLICKY_ENABLE_OUTPUT; |
51 | } | |
52 | ||
53 | void fauxclicky_check() { | |
54 | if (!note_playing) return; | |
55 | ||
56 | if (timer_elapsed(note_start) > note_period) { | |
57 | fauxclicky_stop(); | |
58 | } | |
59 | } |