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29 lines
611 B
C
29 lines
611 B
C
#include <stdint.h>
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#include <buzzer.h>
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#include <hwtimer.h>
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#include <cc430x613x.h>
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void buzzer_beep(uint8_t pitch, uint16_t duration) {
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// Reset TA1R, set up mode, TA1 runs from 32768Hz ACLK
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TA1CTL = TACLR | MC_1 | TASSEL__ACLK;
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// Set PWM frequency
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TA1CCR0 = pitch;
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// Enable IRQ, set output mode "toggle"
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TA1CCTL0 = OUTMOD_4;
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// Allow buzzer PWM output on P2.7
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P2SEL |= BIT7;
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hwtimer_wait(duration);
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// Stop PWM timer
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TA1CTL &= ~(BIT4 | BIT5);
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// Reset and disable buzzer PWM output
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P2OUT &= ~BIT7;
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P2SEL &= ~BIT7;
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TA1CCTL0 &= ~CCIE;
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}
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