/* 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(); } }