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...