C180_oyster_driver/test_app/test_beep.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>


#define DEVICE_PATH "/dev/buzzer"


int main(int argc, char *argv[])
{
    unsigned int flag = 0;
    unsigned int freq = 0;
    unsigned int duration = 0;
    unsigned char buf[4];
    int fd = 0;
    int ret = 0;
    if(argc != 4 && argc != 2)
    {
        printf("Usage: %s on 2 2400\n", argv[0]);
        return 1;
    }

    if(strcmp(argv[1], "on") == 0 && argc == 4)
    {
        flag = 1;
        freq = atoi(argv[3]);
        duration = atoi(argv[2]);
    }
    else if(strcmp(argv[1], "off") == 0)
    {
        flag = 0;
    }
    else
    {
        printf("Usage: %s on 2 2400\n", argv[0]);
        return 1;
    }

    memset(buf, 0, sizeof(buf));
    buf[0] = flag;
    buf[1] = freq&0xff;
    buf[2] = (freq>>8)&0xff;
    buf[3] = duration&0xff;

    fd = open(DEVICE_PATH, O_RDWR);
    if(fd < 0)
    {
        printf("open /dev/buzzer failed\n");
        return 1;
    }

    ret = write(fd, buf, sizeof(buf));
    if(ret < 0)
    {
        printf("write /dev/buzzer failed\n");
        return 1;
    }
    close(fd);
}