From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Larmour To: Grant Edwards Cc: ecos-discuss@sources.redhat.com Subject: Re: [ECOS] Separate console and debug ports? Date: Tue, 13 Mar 2001 12:26:00 -0000 Message-id: <3AAE8245.1DCDDD81@redhat.com> References: <20010307164159.A26702@visi.com> <20010308090146.A28096@visi.com> X-SW-Source: 2001-03/msg00192.html Grant Edwards wrote: > > In order to avoid loosing input characters I got rid of the > timeouts in RedBoot's gets(), so now if there's no input on a > UART, it doesn't delay. It checks the next UART (or the > network) immediately. I don't understand the purpose of the > delay after checking a UART -- my configuration works a lot > better without them. > > Since nobody is calling the 1ms delay routine that updates the > system time, I did have to add to the main loop a call to a new > routine in ticks.c to advance the system by about 80us > everytime through the loop. The unfortunate thing about that > setup is that you have to tune the "system time adjust" value > by hand to get a reasonably accurate system time. > > But, ping resonse time is 1-2 ms and I never loose console > characters at 57.6K baud. :) I may well be talking out my *rse, but what about trying to make the timer interrupt driven rather than polled, and then delay_us just reads a global volatile counter? Normally RedBoot is completely polled, but as long as you mask all your unused interrupt sources I don't know any reason why there'd be a problem. Admittedly I don't think we would want such a change in the master sources so this wouldn't solve the problem for everyone. Jifl -- Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062 Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine