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37 lines
732 B
37 lines
732 B
/** @file beep1.c
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@author M.P. Hayes
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@date 17 Sep 2013
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*/
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#include "system.h"
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#include "pio.h"
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#include "pacer.h"
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/* Connect piezo tweeter to pins 6 and 8 of UCFK4 P1 connector
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for push-pull operation. */
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#define PIEZO1_PIO PIO_DEFINE (PORT_D, 4)
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#define PIEZO2_PIO PIO_DEFINE (PORT_D, 6)
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#define TONE_FREQUENCY 440
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#define LOOP_RATE (TONE_FREQUENCY * 2)
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int main (void)
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{
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system_init ();
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pio_config_set (PIEZO1_PIO, PIO_OUTPUT_LOW);
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pio_config_set (PIEZO2_PIO, PIO_OUTPUT_HIGH);
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pacer_init (LOOP_RATE);
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while (1)
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{
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pacer_wait ();
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/* Generate annoying tone. */
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pio_output_toggle (PIEZO1_PIO);
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pio_output_toggle (PIEZO2_PIO);
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}
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return 0;
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}
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