Watchdog Timer Sample Code - Advantech ROM-3420CD-MDA1E User Manual

Edit the helloworld.c with the following source code:
#include <stdio.h>
void main()
{
printf("Hello World!\n");
}
10. Save the file and exit.
#$CC ‐o helloworld helloworld.c (To compile helloworld.c)
11.
12. Then you can see "helloworld" in current directory.
13. Insert the Linux system SD card to your development computer.
#cp helloworld /media/rootfs/tool (/media/rootfs is the mounted point of
14.
your Linux system SD card)
15. Remove this SD card and insert it to ROM-DB3900, then open debug console.
On ROM-3420 platform, type #root (Login)
16.
On ROM-3420 platform, type #cd /tool
17.
On ROM-3420 platform, type #./helloworld
18.
19. Now you should be able to see "Hello World!" shown on ROM-3420.
3.8.2

Watchdog Timer Sample Code

WatchDog Timer (WDT) sample code is as below:
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/watchdog.h>
#include <sys/ioctl.h>
#include <unistd.h>
void help_info(void);
int main(int argc, const char *argv[])
{
int fd, timeout, sleep_sec, test;
int count=1;
if (argc < 2) {
}
timeout = atoi(argv[1]);
sleep_sec = atoi(argv[2]);
if (sleep_sec <= 0) {
}
test = atoi(argv[3]);
help_info();
return 1;
sleep_sec = 1;
printf("correct 0 or negative sleep time to %d seconds\n",
sleep_sec);
31 ROM-3420 User Manual