《开发板 — 实现看门狗》

1.内核配置

　　------->Device Drivers

　　　　-------->Watchdog Timer Support

　　　　　　-------->WatchDog Timer Driver Core[*]

　　　　　　-------->Software watchdog[*]

 　　编译烧录内核，然后在板卡上面可以看到/dev/watchdog

2.看门狗编程

int fd = open("/dev/watchdog", O_WRONLY);
if(fd == -1){
    printf("open watchdog error \n\n\n");
    return false;
}
int timeout;
timeout = 15;
ioctl(fd, WDIOC_SETTIMEOUT, &timeout); //设置超时
printf("The timeout was set to %d seconds\n", timeout);

　　

 喂狗

ioctl(this->fd, WDIOC_KEEPALIVE);