arm下蜂鸣器测试代码

#include <stdio.h>

#include <sys/ioctl.h>
#include<fcntl.h>
void main()
{
int fd;
int freq = 0;
fd = open("/dev/beep",O_RDWR);
while(1)
{
//ioctl(fd,1,1);
ioctl(fd,1,freq);
sleep(5);
//ioctl(fd,0,freq);
freq += 20;
ioctl(fd,0,freq);
printf("freq:%d\n",freq);
}
}