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KTD-S0006-B Page 11 Watchdog and Backlight

MOPSlcdLX Software Guide

4 Watchdog and Backlight

The following examples (DOS programs) show the access to these two system components (C compiler:

BORLAND C++).

Note: These examples can't be run on Linux and Windows

4.1 Watchdog Example

#include <dos.h>

#define JIDA16_INT 0x15

#define WDT_INIT 0xE000

#define WDT_TRIGGER 0xE001

#define WDT_TIMEOUT 50 // timeout = 10 seconds (time base = 0.2 seconds)

#define WDT_DELAY 0 // no delay

void ActivateWatchdog (void)

{

union REGS regs;

regs.x.ax = WDT_INIT;

regs.x.bx = WDT_TIMEOUT;

regs.x.cx = WDT_DELAY;

regs.x.dx = 0; // only RESET possible

int86 (JIDA16_INT, &regs, &regs);

}

void TriggerWatchdog (void)

{

union REGS regs;

regs.x.ax = WDT_TRIGGER;

int86 (JIDA16_INT, &regs, &regs);

}

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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