Arbor Technology FPC-7900, User Manual

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Appendices
A: Digital I/O Setting
Digital I/O can read from or write to a line or an entire digital port, which is a
collection of lines. This mechanism helps users achieve various applications
such as industrial automation, customized circuit, and laboratory testing. Take
the source code below that is written in C for the digital I/O application example.
Sample Codes:
/*-----------------------------------------------------------------------
----*/
#include <math.h>
#include <stdio.h>
#include <dos.h>
int sioIndex = 0x2E;
int sioData = 0x2F;
int main(void)
{
int iData;
SioGPIOMode(0xFF00);
delay(2000);
SioGPIOData(0x5500);
delay(2000);
iData = SioGPIOStatus();
printf(" Input : %2x \n",iData);
delay(2000);
SioGPIOData(0xAA00);
delay(2000);
iData = SioGPIOStatus();
printf(" Input : %2x \n",iData);
delay(2000);
return 0;
}
void SioGPIOMode(int iMode)
{
int iTemp;
outportb(sioIndex,0x87); /* Enable
Super I/O */
outportb(sioIndex,0x87);
outportb(sioIndex,0x07); /* Select