Lpc2000

Hi,

thanks for the suggestions. Also well worth a try. I will report my 
findings back.

I would like to thank you and everyone else who have responded to this 
problem. Your suggestions, questions are very valuable and I hope I can 
give something back in the future.

/Ake

3gpabko wrote:

> Hi there,
> there is a note in the UM about the feeding sequence
> of the PLL which says that the writing of 0xAA and
> then 0x55 must be two consecutive VPB cycles. No
> interrupts between them. For the WDT the text is
> different it says that after feeding 0xAA "...the next
> operation in the Watchdog register space should be a
> WRITE (0x55) to the WDFEED register otherwise the
> Watchdog is triggered."
>
> May be the dog doesn't like to be interrupted when
> feeding.
>  
> Regards
>
> --- "Ake Hedman, eurosource" <akhe@brattberg.com>
> wrote:
>
> > Hi all.
> >
> > I am trying to enable the watchdog but the result is
> > a total hang of the
> > board. Not even the bootloader is possible to reach
> > after the crash and
> > I have to reapply power with P0.14 low to get access
> > to the botloader
> > again. Reset is not enough.
> >
> > The code to initialize the watchdog is
> >
> >     // initialize the watchdog timer
> >     WDTC = 0xffffffff; // 15000000;                
> >       // One second
> > = 15000000
> >     WDMOD = WDEN | WDRESET;                    //
> > Activate watchdog
> >     WDFEED = 0xAA; WDFEED = 0x55;
> >
> > I must have misunderstood the WD functionality. What
> > am I doing wrong?
> > In the above code the watchdog should not trigger
> > until 5 minutes
> > elapsed so even if a vector should be wrong the code
> > that follow should
> > run for a while but as soon as I write to the WDMOD
> > register I get a hang.
> >
> > /Ake
> >
> > --
> >  ---
> > Ake Hedman (YAP - Yet Another Programmer)
> > eurosource, Brattbergavägen 17, 820 50 LOS, Sweden
> > Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
> > Company home: http://www.eurosource.se     
> > Kryddor/Te/Kaffe: http://www.brattberg.com
> > Personal homepage: http://www.eurosource.se/akhe
> > Automated home: http://www.vscp.org
> >
> >
> >
>
>
>
>            
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-- 
 ---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergavägen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se      
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org



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