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Subject: Re: serial line interference problems

Re: serial line interference problems

From: BlueChip <>
Date: Wed, 16 Jun 2004 10:13:10 +0100

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?


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.

Received on 2004-06-16

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