ADLINK cPCI-6620 - Manual (Page 44)

32 Drivers & Utilities
Sample Code
The sample program written in C shown below offers an interactive
way to test the Watchdog Timer under DOS.
#include<stdio.h>
#include<dos.h>
#define IT8783_ID1 0x87
#define IT8783_ID2 0x83
static unsigned int IT8783_ioPort = 0x2e;
//Check index port
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);
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;
}
}
//Exit index port
void Exit_IT8783_Config(unsigned int flag)
{
if(flag) IT8783_ioPort = 0x4e;