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Rockbox mail archiveSubject: Re: serial line interference problemsRe: serial line interference problems
From: sophana <jobarjo78_at_yahoo.fr>
Date: Thu, 17 Jun 2004 10:57:37 +0200 I've solved my problems. It was the line-in which caused a problem, even if disabled. What I did is simply cut the original line-in wire. For the skipping, I changed serial interrupt prio to 8, and disabled interrupts while transmitting inside the interrupt. It works fine. (I also raised the DMA int level to 13 but I don't know if it is useful) There may be some interrupts that I dont know which caused the skipping I heard. BlueChip wrote: > Just a couple of wild guesses... > > 1. Have you checked that the line-in is disabled on the MAS? > > 2. Have you tried the anti-skip buffer to resolve the skipping issue? > > Maybe I guess lucky today? > > BC > > At 09:45 16/06/04, you wrote: > >> Hi all >> >> I did finish the development of my cd changer emulation. But there >> was one thing I never did during the development: listen to the music. >> Yesterday, I installed my sony head unit and my archos in my car, >> then I discovered 2 problems: >> First there is a very audible noise due to serial communications. I >> have choosed to use the line-in connector, instead of the ear because >> of the auto power on mod, to connect the serial line. Does anyone >> knows if the noise is due to the line-in connection or directly >> because of the serial line? have people who made the serial mod >> noticed noise interference during communications? >> >> My second problem is partialy resolved: The software tx path that I >> used was blocking interrupts inside the interrupt handler, causing >> pops in the sound because of mp3 buffer underruns I think. What I did >> is lower the serial interrupt level to 4 and allow interrupts during >> software tx. Now there are no more pops but I have lots of >> transmission error. >> Does anyone have a suggestion? >> >> I think I will have to connect the serial tx to the rx line so there >> will be no more interrupt masking. >> >> Regards >> Sophana >> _______________________________________________ >> http://cool.haxx.se/mailman/listinfo/rockbox > > > _______________________________________________ > http://cool.haxx.se/mailman/listinfo/rockbox > _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-06-17 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |