Adlink NuPRO-E340 User Manual download pdf (Page 85)

Watchdog Timer 71

NuPRO-E340

Appendix A - Watchdog Timer

A sample program for configuring the NuPRO-E340’s watchdog

timer is included on the ADLINK All-in-One DVD in the following

directory: \NuPRO\NuPRO-E340\WDT.

A.1 Sample Code

#include<stdio.h>

#include<dos.h>

static unsigned int IT8783_ioPort = 0x2e;

void Enter_IT8783_Config(unsigned int flag)

{

if(flag) IT8783_ioPort = 0x4e;

switch(IT8783_ioPort)

{

case 0x2E: //Address port = 0x2E, enter keys =

0x87, 0x01, 0x55, 0x55

outportb(0x2E, 0x87);

outportb(0x2E, 0x01);

outportb(0x2E, 0x55);

break;

case 0x4E: //Address port = 0x4E, enter keys =

0x87, 0x01, 0x55, 0xAA

outportb(0x4E, 0x87);

outportb(0x4E, 0x01);

outportb(0x4E, 0x55);

outportb(0x4E, 0xAA);

break;

default:

break;

}

void Exit_IT8783_Config(unsigned int flag)

{

if(flag) IT8783_ioPort = 0x4e;

outportb(IT8783_ioPort, 0x02);

outportb(IT8783_ioPort+1, 0x02);

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Adlink NuPRO-E340 User Manual Page 85