Kontron pITX-SP - Manual (Page 34)

KTD-S0003-C Page 30 CPLD Interface
p ITX-SP Software Guide
6.2.5 Fan Control Example
#include <stdio.h>
#include <dos.h>
#include <conio.h>
#define CPLD_BASE_ADDR 0xA80
#define FAN_CTRL_INDEX 0xF4
#define FAN_MASK 0x1F
#define RESERVED_MASK 0xE0
void SetFanVal (unsigned char value)
{
unsigned
char reg;
outp (CPLD_BASE_ADDR, FAN_CTRL_INDEX);
reg = inp (CPLD_BASE_ADDR+1);
reg &= RESERVED_MASK;
value &= FAN_MASK;
value |= reg;
outp (CPLD_BASE_ADDR+1, value);
}
void main (void)
{
SetFanVal
(0x05);
getch ();
SetFanVal (0x15);
}