Appendix A: Programming The Watchdog Timer - Aaeon SBC-556/L Manual

#include <dos.h>
#include <io.h>
#include <bios.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
/* Set I/O Address : 370/371 or 3F0/3F1 */
#define IO_INDEX_PORT 0x3f0
#define IO_DATA_PORT 0x3f1
/* Set Watchdog reset pin : 12/13/16 */
#define watch_dog_output_GP 12
#define UNLOCK_DATA
#define LOCK_DATA
#define DEVICE_REGISTER 0x07
void EnterConfigMode()
{
outportb(IO_INDEX_PORT, UNLOCK_DATA);
outportb(IO_INDEX_PORT, UNLOCK_DATA);
}
void ExitConfigMode()
{
outportb(IO_INDEX_PORT, LOCK_DATA);
}
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Appendix A Watchdog Timer 97