w83627hf_test.c

主板上提供一个可按分或秒计时的

#include <stdio.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <unistd.h>
#include "w83627hf_wdt.h"

#define WDT_DEVICE "/dev/watchdog"
#define WATCHDOG_TIMEOUT 30 


/* 根据传入的参数处理各种ioctl操作 */
void wdt_ioctl(int fd, unsigned int cmd, unsigned long arg)
{
	struct watchdog_info *argp = (struct watchdog_info *)arg;
	int *p = (int *)arg;
	int ret;
	switch (cmd)
	{
		case WDIOC_GETSUPPORT:/* 获取wdt_all_info */
			ioctl(fd, cmd, argp);
			if(argp->options & WDIOF_KEEPALIVEPING)
				printf("WDIOF_KEEPALIVEPING\n");
			if(argp->options & WDIOF_SETTIMEOUT)
				printf("WDIOF_SETTIMEOUT\n");
			if(argp->options & WDIOF_MAGICCLOSE)
				printf("WDIOF_MAGICCLOSE\n");
			printf("firmware_version:%d\n", argp->firmware_version);
			printf("identity:%s\n", argp->identity);
			break;
		case WDIOC_GETSTATUS:
			ioctl(fd, cmd, p);
			printf("status:%d\n", *p);
			break;
		case WDIOC_SETTIMEOUT:/* 设置超时值 */
			ret = ioctl(fd, cmd, p);
			if(ret == 0)
				printf("settimeout success!\n");
			else
				printf("settimeout failed!\n");
			break;
		case WDIOC_SETOPTIONS:/* 设置看门狗状态，开启/禁用 */
			ret = ioctl(fd, cmd, p);
			printf("wdt enable ret is:%d\n", ret);
			break;
		case WDIOC_GETTIMEOUT:/* 获取超时值 */
			ret = ioctl(fd, cmd, p);
			if(ret == 0)
				printf("timeout: %d\n", *p);
			else
				printf("gettimeout failed!\n");
			break;
		default:
	  		return;
	}
}

int main(int argc,char *argv[])
{
	int wdt;
	struct watchdog_info info;
	unsigned long arg=0;
	wdt = open(WDT_DEVICE, O_RDWR);/* 打开设备 */
	if(wdt < 0)
	{
	printf("I can not open watchdog\n");
	return 1;
	}
	//ioctl
	wdt_ioctl(wdt, WDIOC_GETSUPPORT, (unsigned long)&info);/* 获取看门狗信息 */
	wdt_ioctl(wdt, WDIOC_GETSTATUS, (unsigned long)&arg);
	wdt_ioctl(wdt, WDIOC_GETTIMEOUT, (unsigned long)&arg);/* 获取看门狗超时值 */
	//enable watchdog
	arg = WDIOS_ENABLECARD;
	wdt_ioctl(wdt, WDIOC_SETOPTIONS, (unsigned long)&arg);/* 开启看门狗 */
	//set new timeout 
	arg = WATCHDOG_TIMEOUT;
	wdt_ioctl(wdt, WDIOC_SETTIMEOUT, (unsigned long)&arg);/* 设置看门狗超时值为WATCHDOG_TIMEOUT */
	wdt_ioctl(wdt, WDIOC_GETTIMEOUT, (unsigned long)&arg);/* 获取看门狗超时值 */

	while (1)//fee watchdog
	{
		arg = WATCHDOG_TIMEOUT;
		write(wdt, &arg, sizeof(arg));/* 喂狗 */
		sleep(1);
	}
	close(wdt);
	return 0;
}