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Subject: serial line interference problems
From: sophana (jobarjo78_at_yahoo.fr)
Date: 2004-06-16


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
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