Synth-DIY Yahoo! Groups Archives

LPC2294 Software Reset vs. Watchdog

2005-09-09 by mpwalter2005

Hi,

some problem: after flashing the internal flash with IAP, i want to 
perform a restart. I know it works good with the watchdog, using this 
commands:

WDTC  = 0x00FFF; 
WDMOD = 0x03;      
WDFEED= 0xAA;
WDFEED= 0x55;

but I don't want to use the watchdog, I will use a software reset. So 
i write this code:

void (*reset)(void);

void function (..)
{
 ... iap routines ...
 reset = (void (*)(void))(0x0000);
 reset();
}

so it do what I want - jump to the reset handler , but my program 
will not start (when i doing a reset, by pressing the reset-button on 
my phycore board it will runs great !) - so what is wrong or what can 
I do ? Must changing some registers ? 

Thanks for every hint
Matthias

Re: [lpc2000] LPC2294 Software Reset vs. Watchdog

2005-09-09 by Richard Duits

Make sure you set VPBDIV to zero before you initialize EXTMODE, 
EXTPOLAR, etc.
VPBDIV is zero on reset, but it may not be zero if you jump to address 
0x00000000.

Also initializing the PLL while it is still connected to CCLK, may not 
work (never tried this).

Look for other initializations that assume reset values.


Richard Duits


mpwalter2005 wrote:

Show quoted textHide quoted text

> Hi,
>
> some problem: after flashing the internal flash with IAP, i want to
> perform a restart. I know it works good with the watchdog, using this
> commands:
>
> WDTC  = 0x00FFF;
> WDMOD = 0x03;     
> WDFEED= 0xAA;
> WDFEED= 0x55;
>
> but I don't want to use the watchdog, I will use a software reset. So
> i write this code:
>
> void (*reset)(void);
>
> void function (..)
> {
> ... iap routines ...
> reset = (void (*)(void))(0x0000);
> reset();
> }
>
> so it do what I want - jump to the reset handler , but my program
> will not start (when i doing a reset, by pressing the reset-button on
> my phycore board it will runs great !) - so what is wrong or what can
> I do ? Must changing some registers ?
>
> Thanks for every hint
> Matthias
>
>
>
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Lpc2000

LPC2294 Software Reset vs. Watchdog

LPC2294 Software Reset vs. Watchdog

Re: [lpc2000] LPC2294 Software Reset vs. Watchdog

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