Aaeon PFM-535S Bedienungsanleitung PDF herunterladen (Seite 42)

PC/104 CPU Module PFM-535S

Appendix A Programming the Watchdog Timer A-9

{

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

outp(0x22,0x37);

c = inp(0x23);

c |= 0x40;

outp(0x22,0x37);

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Aaeon PFM-535S Bedienungsanleitung Seite 42