Lpc2000

Hi!

I tried to use the watchdog, but it looks like I can't set a long 
timeout or it ignores my kicking.
I am getting a reset right away...


WDTC = 7500000L;  // Set for ca. 2 seconds at 60 MHz and devide by 4
WDMOD = 0x03;

while(1)
  {
  WDFEED = 0xAA; WDFEED = 0x55;
  bla.
  bla.
  etc.

  // looptime not more then 10 ms

  }

Anyone with a clue?

//Helge

At 06:19 PM 3/23/04 +0000, you wrote:
>I tried to use the watchdog, but it looks like I can't set a long
>timeout or it ignores my kicking.

Does that mean it works for shorter times?

>I am getting a reset right away...
>
>
>WDTC = 7500000L;  // Set for ca. 2 seconds at 60 MHz and devide by 4

Hmm, one of us is doing the arithmetic wrong here :)  I get 0.5 seconds.  A 
count of 15000000 would give 1 second.  Curiously there is no protection 
against modifying this register in the LPC (a bit of a weakness IMHO).

>WDMOD = 0x03;
>
>while(1)
>   {
>   WDFEED = 0xAA; WDFEED = 0x55;

You do have WDFEED declared as volatile?  The fact you get a reset does 
suggest it's get fed properly at least once.

>   bla.
>   bla.
>   etc.
>
>   // looptime not more then 10 ms

Have you checked to make sure the loop is in fact executing multiple times 
before the reset?


>   }

More questions than answers at the moment, I'm afraid.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III

--- In lpc2000@yahoogroups.com, "Helge Fabricius-Hansen"
<helge.fabricius@t...> wrote:
> Hi!
> 
> I tried to use the watchdog, but it looks like I can't set a long 
> timeout or it ignores my kicking.
> I am getting a reset right away...
> 
> 
> WDTC = 7500000L;  // Set for ca. 2 seconds at 60 MHz and devide by 4
> WDMOD = 0x03;
> 
> while(1)
>   {
>   WDFEED = 0xAA; WDFEED = 0x55;
>   bla.
>   bla.
>   etc.
> 
>   // looptime not more then 10 ms
> 
>   }
> 
> Anyone with a clue?
> 
> //Helge


Can you post asembler listing for that part?