Aaeon PFM-535S Manuel d'utilisateur télécharger pdf (Page 38)

PC/104 CPU Module PFM-535S

Appendix A Programming the Watchdog Timer A-5

WDT0 DOS Example

#include <stdio.h>

#include <conio.h>

void main()

{

unsigned char c;

unsigned int lTime;

outp(0x22,0x13); // Lock register

outp(0x23,0xc5); // Unlock config. register

// 500 mini-second

lTime = 0x20L * 500L;

outp(0x22,0x3b);

outp(0x23,(lTime>>16)&0xff);

outp(0x22,0x3a);

outp(0x23,(lTime>> 8)&0xff);

outp(0x22,0x39);

outp(0x23,(lTime>> 0)&0xff);

// Reset system

outp(0x22,0x38);

c = inp(0x23);

c &= 0x0f;

c |= 0xd0; // Reset system. For example, 0x50 to trigger IRQ7

outp(0x22,0x38);

outp(0x23,c);

// Enable watchdog timer

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Aaeon PFM-535S Manuel d'utilisateur Page 38