Audio Line In on A20 ?

Started by gkzsolt, November 30, 2019, 09:25:00 pm

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I bought an A20 intending to use audio in and out. Unfortunately I am interested in stereo line in, and from the schematics I see the input jack is connected only to MICIN1, so no way to get stereo line in from there (I read somewhere MIC/IN can be switched to LINE IN through a jumper - but I guess not in this board..)

Can I access the processor LINE IN pins from the GPIO? Is there a decent map of the GPIO pins in A20? I found only some screenshot on internet, where I see LINEINR twice, on the GPIO-1 bank, I think pins 30 and 32, am I right? (it is dreadful to look at those images;)

I also think that will need some circuitry (at least some capacitors) if I'd like to hook in. Or are there other options?

Many thanks,


Which A20 board exactly do you have?
Technical support and documentation manager at Olimex


It is an A20-MICRO-E16GS16. If I am gonna to use the LINEINR/LINEINL pins, then I'd need some driver support as well, I guess.