hslockmk2/software/keypad/buzzer.c

65 lines
1.1 KiB
C
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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "io.h"
#include "buzzer.h"
IMPORT_IO(BUZZER);
void buzzer_init(void)
{
// Set up Timer1 - CTC and /256 prescaler
TCCR1A = 0;
TCCR1B = _BV(WGM12) | _BV(CS12);
TCNT1 = 0;
OCR1A = 4;
OCR1B = 0xFFFF;
}
void buzzer_start(uint16_t ticks)
{
cli();
TIMSK &= ~_BV(OCIE1A);
OCR1A = ticks;
TIMSK |= _BV(OCIE1A);
TCNT1 = 0;
sei();
}
volatile uint16_t g_BuzzerTicksLeft = 0;
void buzzer_start_timed(uint16_t freq, uint16_t ticks)
{
g_BuzzerTicksLeft = ticks * freq / 2;
buzzer_start(freq);
}
void buzzer_stop(void)
{
cli();
TIMSK &= ~_BV(OCIE1A);
sei();
}
ISR(TIMER1_COMPA_vect)
{
IO_TOGGLE(BUZZER);
/*if (g_BuzzerTicksLeft > 0)
{
g_BuzzerTicksLeft--;
if (g_BuzzerTicksLeft == 0)
TIMSK &= ~_BV(OCIE1A);
}*/
}
void buzzer_signal_boot(void)
{
buzzer_start(TONE_LOW);
_delay_ms(200);
buzzer_start(TONE_MID);
_delay_ms(200);
buzzer_start(TONE_HIGH);
_delay_ms(200);
buzzer_stop();
}