68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
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/*
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Copyright 2014 Kai Ryu <kai1103@gmail.com>
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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/io.h>
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#include <util/delay.h>
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#include "buzzer.h"
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#include "debug.h"
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void buzzer_init(void)
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{
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DDRD |= (1<<PD1);
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PORTD &= ~(1<<PD1);
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}
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inline
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void buzzer_on(void)
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{
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#ifndef EXPERIMENTAL
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PORTD |= (1<<PD1);
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#else
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PORTD |= (1<<PD5);
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#endif
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}
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inline
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void buzzer_off(void)
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{
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#ifndef EXPERIMENTAL
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PORTD &= ~(1<<PD1);
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#else
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PORTD &= ~(1<<PD5);
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#endif
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}
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void buzzer(uint16_t frequency, uint16_t duration)
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{
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uint16_t delay = 100000L / (2 * frequency);
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uint16_t period = (uint32_t)frequency * duration / 1000L;
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uint16_t i;
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//dprintf("delay: %d\nperiod: %d\n", delay, period);
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do {
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buzzer_on();
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i = delay;
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do {
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_delay_us(10);
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} while (--i);
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buzzer_off();
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i = delay;
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do {
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_delay_us(10);
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} while (--i);
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} while(--period);
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}
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