APPENDIX
MI952 User’s Manual
43
C. Watchdog Timer Configuration
The 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, the user
will 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 "F81865.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 81865 watch dog program\n");
SIO = Init_F81865();
if (SIO == 0)
{
printf("Can not detect Fintek 81865, 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();
}
return
0;
}
//---------------------------------------------------------------------------
void EnableWDT(int interval)
{
unsigned char bBuf;
bBuf = Get_F81865_Reg(0x2B);
bBuf &= (~0x20);
Set_F81865_Reg(0x2B, bBuf); //Enable WDTO
