IBASE Technology IB995, Руководство пользователя

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74 IB995
User’s Manual
C. Watchdog Timer Configuration
The Watchdog Timer (WDT) is used to generate a variety of output
signals after a user programmable count. The WDT is suitable for use
in the prevention of system lock-up, such as when software becomes
trapped in a deadlock. Under these sorts of circumstances, the timer
will count to zero and the selected outputs will be driven.
Under normal circumstance, you will need to restart the WDT at
regular intervals before the timer counts to zero.
Sample Code:
//---------------------------------------------------------------------------
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
//---------------------------------------------------------------------------
#include <dos.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include "F81866.H"
//---------------------------------------------------------------------------
int main (int argc, char *argv());
void EnableWDT(int);
void DisableWDT(void);
//---------------------------------------------------------------------------
int main (int argc, char *argv())
{
unsigned char bBuf;
unsigned char bTime;
char **endptr;
char SIO;
printf("Fintek 81866 watch dog program\n");
SIO = Init_F81866();
if (SIO == 0)
{
printf("Can not detect Fintek 81866, program abort.\n");
return(1);
}//if (SIO == 0)
if (argc != 2)
{
printf(" Parameter incorrect!!\n");
return (1);
}
bTime = strtol (argv(1), endptr, 10);
printf("System will reset after %d seconds\n", bTime);
if (bTime)
{ EnableWDT(bTime); }
else
{ DisableWDT(); }