buzzer.c

The source code example of ARM9 development board from Artila (M-501 starter kit). The source code c

/*
 *	Description: 
 *		example for buzzer.
 *		What is shown in this example:
 *		1. How to open buzzer
 *		2. How to make buzzer beep
 *		3. How to end the beep
 *
 *
 */

#include <stdio.h>
#include <errno.h>
#include <sys/kd.h>
#include <fcntl.h>

int main(void)
{
	int	fd;
	unsigned int	arg;
	char	buf[128];

	/*open buzzer*/
	fd = open("/dev/console",O_WRONLY);
	if (fd == -1) {
		printf("open Failed. errno:%d\r\n", errno);
		return;
	}
	arg = 100;	/*frequency*/
	arg |= 0x0100;

	ioctl(fd, KDMKTONE, &arg);	/*start beep*/
	sleep(3);
	ioctl(fd, KDMKTONE, 0);		/*end beep*/

	printf("the buzzer beeped?...[Y][N]");
	fgets(buf, sizeof(buf), stdin);
	close(fd);
}