wiringPi_Blueberry/examples/watchdog.c
2023-08-11 15:53:17 +08:00

116 lines
3.3 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <sys/time.h>
#include <unistd.h>
#include <time.h>
#include <getopt.h>
#include <sys/signal.h>
#include <termios.h>
struct watchdog_info{
unsigned int options; //options the card/driver supprots 19
unsigned int firmware_version; //firmcard version of the card
unsigned char identity[32]; //identity of the board 21
};
#define WATCHDOG_IOCTL_BASE 'W'
#define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
#define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
#define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int) //27
#define WDIOS_DISABLECARD 0x0001
#define WDIOS_ENABLECARD 0x0002
#define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int)
#define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int)
int Getch (void) //无回显的从屏幕输入字符,来达到喂狗的目的
{
int ch;
struct termios oldt, newt; //终端设备结构体
tcgetattr(STDIN_FILENO, &oldt); //获得终端属性
newt = oldt;
newt.c_lflag &= ~(ECHO|ICANON); //设置无回显属性
tcsetattr(STDIN_FILENO, TCSANOW, &newt); //设置新的终端属性
ch = getchar(); //从键盘输入一个数据
tcsetattr(STDIN_FILENO, TCSANOW, &oldt); //恢复终端设备初始设置
return ch;
}
//suspend some seconds
int zsleep(int millisecond)
{
unsigned long usec;
usec=1000*millisecond;
usleep(usec); //usleep(1)睡眠一微秒10E-6),这里也就是0.1s
}
int Init()
{
int fd;
//open device file
fd = open("/dev/watchdog",O_RDWR); //打开看门狗设备
if(fd < 0)
{
printf("device open fail\n");
return -1;
}
printf("open success\n");
return fd;
}
int main(int argc,char **argv)
{
int fd,ch;
int i,j;
char c;
struct watchdog_info wi;
if(argc != 2){
printf("Usage : ./watchdog 10\n");
return -1;
}
fd=Init(); //打开终端看门狗设备
ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
//读板卡信息,但不常用
ioctl(fd,WDIOC_GETSUPPORT,&wi);
printf("options is %d,identity is %s\n",wi.options,wi.identity);
//读看门狗溢出时间
printf("put_usr return,if 0,success:%d\n",ioctl(fd,WDIOC_GETTIMEOUT,&i));
printf("The old reset time is: %d\n", i);
//关闭
i=WDIOS_DISABLECARD;//WDIOC_SETOPTIONS=0X0001
printf("return ENOTTY,if -1,success:%d\n",ioctl(fd,WDIOC_SETOPTIONS,&i));
//打开
i=WDIOS_ENABLECARD;//WDIOS_ENABLECARD 0x0002
printf("return ENOTTY,if -1,success:%d\n",ioctl(fd,WDIOC_SETOPTIONS,&i));
i=atoi(argv[1]);
printf("put_user return,if 0,success:%d\n",ioctl(fd,WDIOC_SETTIMEOUT,&i));
//读新的设置时间
printf("put_usr return,if 0,success:%d\n",ioctl(fd,WDIOC_GETTIMEOUT,&i));
while(1)
{
zsleep(100);
if((c=Getch())!=27){
//输入如果不是ESC就喂狗否则不喂狗到时间后系统重启
printf("keep alive \n");
ioctl(fd,WDIOC_KEEPALIVE,NULL);
//write(fd,NULL,1); //同样是喂狗
}
}
close(fd); //关闭设备
return 0;
}