Lpc2000

Are  you "tickling" the watchdog?  Once enabled, you must reset the timer regularly - to tell the WDT that life is good.  Otherwise it will bite you by resetting (in a loop)

 

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From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf Of Jim Parziale
Sent: Tuesday, December 06, 2005 7:37 AM
To: lpc2000@yahoogroups.com
Subject: Re: [lpc2000] Problem with watchdog

 

Assuming you have the correct definitions for your symbols, the only thing I
can think of is setting the timeout to the largest integer like that.  Maybe
you could try a different large integer?

These are what you should be using:
WDEN = BIT(0) = 0x00000001
WDRESET = BIT(1) = 0x00000002
WDMOD  = (uint8_t *)(0xE0000000)
WDTC      = (uint32_t *)(0xE0000004)
WDFEED = (uint8_t *)(0xE0000008)

----------------------------------------------------------
Jim Parziale
Email: nuncio.bitis@gmail.com
Malden, MA
----------------------------------------------------------

On 12/6/05, Ake Hedman, eurosource <akhe@...> 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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