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