Lpc2000

Is there any way to reset the processor from within the firmware?

I am currently using the Watchdog feature, and I know if I stop 
toggling the watchdog then my processor will time out and reset.

However, I need to be able to do different things depending on 
the 'cause' of the reset...

ie if its a watchdog timeout that caused reset I need to do X,Y,Z 
before normal operation
but if its a software triggered reset (eg after I have updated a 
parameter or something in flash) then I only want it to do Y,Z

Obviously I could use some external hardware, however is there any 
way to do it in software????

any help is appreciated!
cheers,

pete

On 7 Oct 2004 at 15:05, bty639886 wrote:

> 
> 
> Is there any way to reset the processor from within the firmware?
> 
> I am currently using the Watchdog feature, and I know if I stop 
> toggling the watchdog then my processor will time out and reset.
> 
> However, I need to be able to do different things depending on 
> the 'cause' of the reset...
> 
> ie if its a watchdog timeout that caused reset I need to do X,Y,Z
> before normal operation but if its a software triggered reset (eg
> after I have updated a parameter or something in flash) then I only
> want it to do Y,Z
> 
> Obviously I could use some external hardware, however is there any way
> to do it in software????
> 

What I have done in the past is to have a 32bit value in a portion of RAM which is not 
initialised by the C startup code. (If you have any). I then write a specific value into this 
address, before I cause a deliberate watchdog reset. After a reset one can then check 
the value. If it is the special value, then it was a "Software Reset" otherwise it was a 
watchdog reset.

Regards
   Anton Erasmus
-- 
A J Erasmus

thanks very much,

I will give this a try,
kind regards
pete

--- In lpc2000@yahoogroups.com, "Anton Erasmus" <antone@s...> wrote:
> On 7 Oct 2004 at 15:05, bty639886 wrote:
> 
> > 
> > 
> > Is there any way to reset the processor from within the firmware?
> > 
> > I am currently using the Watchdog feature, and I know if I stop 
> > toggling the watchdog then my processor will time out and reset.
> > 
> > However, I need to be able to do different things depending on 
> > the 'cause' of the reset...
> > 
> > ie if its a watchdog timeout that caused reset I need to do X,Y,Z
> > before normal operation but if its a software triggered reset (eg
> > after I have updated a parameter or something in flash) then I 
only
> > want it to do Y,Z
> > 
> > Obviously I could use some external hardware, however is there 
any way
> > to do it in software????
> > 
> 
> What I have done in the past is to have a 32bit value in a portion 
of RAM which is not 
> initialised by the C startup code. (If you have any). I then write 
a specific value into this 
> address, before I cause a deliberate watchdog reset. After a reset 
one can then check 
> the value. If it is the special value, then it was a "Software 
Reset" otherwise it was a 

> watchdog reset.
> 
> Regards
>    Anton Erasmus
> -- 
> A J Erasmus