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Lpc2000

Index last updated: 2026-04-28 23:31 UTC

Message

Re: Bootloader not always invoked after reset with P0.14 low

2006-02-26 by Jayasooriah

Hi Guile,

I may be misunderstanding the problem.

You made the comment:

>It looks like this behavior is 'by design' so there is no other workaround 
>than switching off the unit.

Philips followed up:

>Even clearing of watchdog flag in user application may not help (if 
>timeout is too small) because the bootloader runs before application.

For purposes of ruling out watchdog issues in problem I am looking into, I 
want to recreate the above watchdog problem.

My sample code sets up the watchdog to trigger in minimum time, and does 
nothing but wait for the watchdog to trigger.

In had no problems getting back to ISP with this code on my 2292.  I did 
not need to switch off.

I wanted to try this on your board.  If it works without need to switch 
off, then my understanding of the problem is incorrect.  If it does need 
you to switch off, then the problem may be specific to the part of version 
of boot loader.

I like to find out which of the above is the case.

Regards,

Jaya 

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