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ISP synchonisation issue with Philips softwarre

ISP synchonisation issue with Philips softwarre

2004-03-10 by embeddedjanitor

Hi All

Searching back a bit I see that quite a few people have had problems 
with the ISP code from Philips.

Today I tried to get this going but it just would not work, so I 
thought I'd debug it a bit.

There seem to be two problems:
1) Some computers (eg. my laptop, and I believe some desktops with 
power saving features) might be sending out something thatlooks like
a 
break when the port is not active. This, I hunch, can confuse the ISP 
firmware's autobaud detection.

2) The ISP code sends out one '?', that's it! If there was a retry 
then perhaps it would get synchonised more reliably. I have 
encountered situations where up to 75 or so '?' retries were required 
before I got synchronisation.

I think these two issues are most likely to occur in boards using a 
manual reset mechanism. Boards using the DTR/RTS triggered reset
might 
be getting a more reliable boot-up.

Anyway Philips, it would be nice if you could fix these problems...

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