Lpc2000

Jim Parziale wrote:

> 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,

yes my defines are the same and yes I have tested with other values for 
the watchdog period. According to the manual the watchdog timer should 
start when the 0xaa, 0x55 sequence is written but my problems are occurs 
as soon as I write to the WDMOD register.

What situations can prevent the bootloader from working after a reset?

/Ake

>
> ----------------------------------------------------------
> 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
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
>
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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



[Non-text portions of this message have been removed]