Lpc2000

---- Original Message ----
From: "Ken Wada" <kwada@...>
To: <lpc2000@yahoogroups.com>
Sent: Saturday, December 10, 2005 12:17 AM
Subject: [lpc2000] Re: Problem with watchdog

> ok...
> I can surely tell you this...
> I had the Watchdog working perfectly, until I started adding interrupt
> support, (mainly device drivers for the UART). After days of pulling
> my hair out, and interpreting the UM for the LPC2214 as a lawyer would
> do; it occured to me that the UM says 'feed 0x55 then 0xAA' It made
> absolutely no mentioned about what may happen if the process got
> preempted by an interrupt...
> 
> Then alas; when I installed my 1st interrupt service routine; all
> worked fine, for a few hours, and sometimes for a couple of days...
> 
> Then my clients started complaining about 'these spurious reset
> events'. They demanded that I fix the problem right away.
> 
> SO...
> I came to this forum: AND I saw this:
> message #5470 ---> Please also read all the threads that spawned from
> this message.

OK, it certainly looks like an interrupt between the feed writes will reset
the CPU.  All the manuals, including the new LPC2103 manual, have the same
wording about WDFEED.  philips_apps, is this a bug in the manuals or in the
chips?

Karl Olsen