sigtimer.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 46 行

#include "config.h"
#include <signal.h>

#define LED  16     // P2.16 controle LED
uint32 counter = 0;

static void sig_alarm(int sec)
{
    int fd;
    uint32 pin;

    counter++;
    printf("alarm\n");
    printf("%d\n", counter);

    fd = open("/dev/P2", O_RDONLY);
    if(fd == -1)
    {
        printf("\nCan't open P2!\n");
        exit(-1);
    }

    ioctl(fd, GPIO_SET_PIN_OUT, LED);

    pin = LED;
    ioctl(fd, GPIO_READ_PORT, &pin);

    if (pin)
        ioctl(fd, GPIO_CLR_PIN, LED);
    else
        ioctl(fd, GPIO_SET_PIN, LED);

    alarm(1);
    close(fd);
}

int main(void)
{
    signal(SIGALRM,sig_alarm);

    alarm(2);

    while(1);
    return 0;
}