FWIW:
The following routine worked for me. I used P0.4 &5 to be able to
see an i/o pin assert and de-assert using the Keil MCB2100(no
expansion bus):
void init_WDT (void){
WDTC = 0xFF;
WDMOD= 0x03;
WDFEED=0xAA;
WDFEED=0x55;
}
void init_iopins4and5 (void){
PINSEL0=0x0;
IODIR0=0x00000030;
IOCLR0 = 0x00000030;
}
long count;
long spare;
int main (void) {
count=0x0;
spare=0x0;
/* Establish Port 0 bit 4 and 5 as outputs and
de-assert both */
init_iopins4and5();
if (WDMOD==0x04)
IOSET0=0x00000020; //P0.05 set
else
spare++;/*startup the watchdog timer
- watchdog interrupt enable = 1
- watchdog reset enable = 1
SO when WDEN and Watchdog timeout happens, a hardware reset should
occur
*/
init_WDT();
if (WDMOD==0x03)
IOSET0 =0x00000010; //set P0.04
else
spare++;
while (1);
Regards,
Will
}--- In , "markcrow" <mcrow@p...> wrote: > A side note to all those working on the LPC22xx
chips and using
> external memory: When the watchdog times out it will try to access
> vector memory at relative 0x00000000 using the memory attached to CS0 > (instead of address 0 of the internal flash
memory).
> --- In , "cd_racer2" <cd_racer@m...> wrote:
> > Initialization:
> >
> > /* Setting watchdog work mode */
> > WDMOD |= WDMOD_WDEN;
> > WDMOD |= WDMOD_WDRESET;
> > /* Dropping watchdog timeout flag */
> > WDMOD &= ~WDMOD_WDTOF;
> > /* Setting watchdog timeout */
> > WDTC = WatchdogTimeout;
> >
> > WDFEED = 0xAA;
> > WDFEED = 0x55;
> >
> > -----------
> > Reset each cycle:
> >
> > WDTC &= ~WDMOD_WDTOF;
> > /* Feeding 0xAA, 0x55 to restart watchdog */
> > WDFEED = WDFEED_WDFEED(0xAA);
> > WDFEED = WDFEED_WDFEED(0x55);
> >
> > This code is from our Watchdog driver. We've successfully test
> it.
A side note to all those working on the LPC22xx chips and using
external memory: When the watchdog times out it will try to access
vector memory at relative 0x00000000 using the memory attached to CS0
(instead of address 0 of the internal flash memory).
--- In , "cd_racer2" <cd_racer@m...> wrote: > Initialization:
>
> /* Setting watchdog work mode */
> WDMOD |= WDMOD_WDEN;
> WDMOD |= WDMOD_WDRESET;
> /* Dropping watchdog timeout flag */
> WDMOD &= ~WDMOD_WDTOF;
> /* Setting watchdog timeout */
> WDTC = WatchdogTimeout;
>
> WDFEED = 0xAA;
> WDFEED = 0x55;
>
> -----------
> Reset each cycle:
>
> WDTC &= ~WDMOD_WDTOF;
> /* Feeding 0xAA, 0x55 to restart watchdog */
> WDFEED = WDFEED_WDFEED(0xAA);
> WDFEED = WDFEED_WDFEED(0x55);
>
> This code is from our Watchdog driver. We've successfully test it.
