Advantech SG-1103 Manual de usuario descargar pdf (Pagina 39)

31 ROM-5420 User Manual

Chapter 3 Software Functionality

5. #. setenv.sh (To configure the developing environment automatically)

6. #cd ../source

7. #mkdir helloworld (Create your own work directory on the Desktop)

8. #cd helloworld (Enter the work directory)

9. #gedit helloworld.c (Create a new C source file)

Edit the helloworld.c with the following source code:

#include <stdio.h>

void main()

{

printf("Hello World!\n");

}

10. Save the file and exit.

11. #$CC -o helloworld helloworld.c (To compile helloworld.c)

12. Then you can see “helloworld” in current directory.

13. Insert the Linux system SD card to your developing computer.

14. #cp helloworld /media/rootfs/tool (/media/rootfs is the mounted point of

your Linux system SD card)

15. Remove this SD card and insert it to ROM-5420, then open serial console.

16. On ROM-5420 platform, type #root (Login)

17. On ROM-5420 platform, type #cd /tool

18. On ROM-5420 platform, type #./helloworld

19. Now you should be able to see “Hello World!” shown on ROM-5420.

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) {

help_info();

return 1;

}

t imeout = atoi(argv[1]);

sleep_sec = atoi(argv[2]);

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Advantech SG-1103 Manual de usuario Pagina 39

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