beep.c

来自「周立功magic2200实验箱linux增补例子。包括（GPIO zlg7290」· C语言 代码 · 共 33 行

#define IN_TGPIO
#include "config.h"

#define BEEP  7

int main(void)
{
    int fd;
    int i, j;
    //uint32 val;

    fd = open("/dev/P0", O_RDONLY);
    if(fd == -1)
    {
        printf("\nCan't open P0!\n");
        return -1;
    }

    // set GPIO Direction
    ioctl(fd, GPIO_SET_PIN_OUT, BEEP);
    while(1)
    {
        printf("\nBeeping,Press CTRL+C to stop.\n");
        ioctl(fd, GPIO_SET_PIN, BEEP);
        sleep(1);
        ioctl(fd, GPIO_CLR_PIN, BEEP);
        sleep(1);
    }

//    close(fd);
    return 0;
}