49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
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* Example for RetroBSD on Olimex Duinomite board.
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* Passive buzzer is connected to D0 pin of Duinomite board.
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* Use ioctl() calls to poll the user button, and control the buzzer.
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*/
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/gpio.h>
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/*
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* Pin D0 is connected to signal RE0 on pic32 chip.
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* User button is connected to signal RD8 on pic32 chip.
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*/
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#define MASK_D0 (1 << 0) /* signal RE0 */
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#define MASK_BUTTON (1 << 8) /* signal RD8 */
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int main()
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{
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int fd, portb;
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char *devname = "/dev/porta";
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/* Open GPIO driver. */
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fd = open(devname, 1);
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if (fd < 0) {
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perror(devname);
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return -1;
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}
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/* Configure pins. */
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ioctl(fd, GPIO_PORTD | GPIO_CONFIN, MASK_BUTTON);
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ioctl(fd, GPIO_PORTE | GPIO_CONFOUT, MASK_D0);
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ioctl(fd, GPIO_PORTE | GPIO_CLEAR, MASK_D0);
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for (;;) {
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/* Poll button at RD8 (active low). */
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portb = ioctl(fd, GPIO_PORTD | GPIO_POLL, 0);
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if (~portb & MASK_BUTTON) {
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/* Toggle buzzer at D0. */
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ioctl(fd, GPIO_PORTE | GPIO_INVERT, MASK_D0);
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usleep(5000);
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} else {
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/* Disable buzzer at D0. */
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ioctl(fd, GPIO_PORTE | GPIO_CLEAR, MASK_D0);
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}
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}
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return 0;
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}
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