Kontron KTLX800-pITX Manual de usuario descargar pdf (Pagina 17)

KTD-S0023-A Page 14 CPLD Interface

KTLX800/pITX Software Guide

5.2 Programming Examples

The following examples (DOS programs) show the access to the CPLD features (C compiler: BORLAND C++).

Note:

These programs cannot be run on Linux and Windows

5.2.1 Watchdog Example

#include <stdio.h>

#include <dos.h>

#define CPLD_BASE_ADDR 0xA80

#define WDT_INDEX 0x08

#define WDT_ENABLE 0x40

#define WDT_TRIGGER 0x80

#define WDT_1SEC 0x00

#define WDT_5SEC 0x01

#define WDT_10SEC 0x02

#define WDT_30SEC 0x03

#define WDT_1MIN 0x10

#define WDT_5MIN 0x11

#define WDT_10MIN 0x12

void ActivateWatchdog (void)

{

outp (CPLD_BASE_ADDR, WDT_INDEX);

outp (CPLD_BASE_ADDR+1, WDT_10SEC);

delay (1); // wait one millisecond

outp (CPLD_BASE_ADDR+1, WDT_ENABLE);

}

void TriggerWatchdog (void)

{

outp (CPLD_BASE_ADDR, WDT_INDEX);

outp (CPLD_BASE_ADDR+1, WDT_TRIGGER | WDT_ENABLE);

delay (1); // wait one millisecond

outp (CPLD_BASE_ADDR+1, WDT_ENABLE);

}

void main (void)

{

int i;

ActivateWatchdog ();

for (i = 0; i < 5; i++) // wait half of expiry time (= 5 seconds)

delay (1000); // wait 1 second

TriggerWatchdog (); // trigger the watchdog - total expiry time now 15 seconds

}

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Kontron KTLX800-pITX Manual de usuario Pagina 17