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Trying to set the proper registers for Dig Mic input with the ADAU1761Z eval board

Question asked by mward on May 9, 2014
Latest reply on May 9, 2014 by BillJ

I am trying to do something simple, attach a INMP421 (formerly AD's microphone) digital mic to the ADAU1761Z board.  It should be simple, but I can't seem to make a correspondence between the documentation for the registers and the SigmaStudio interface.


I started with a project that works fine for line in audio.  But I can't seem to find the magic to get a signal playing through the Digital Mic.


I have attached some pictures of my board, a couple of screenshots from my SigmaStudio project, the SigmaStudio project itself.  Below are some questions I have.  I would so appreciate someone taking a look.






• JDFUNC[1:0] in Register R2 to 0b10—sets the

JACKDET/MICIN pin to digital microphone input mode


Is this set by setting the Jack Detect Mode / Mic In setting in the SigmaStudio project?  Do I have it set correctly?  Does the board also have to be physically jumpered?



• MS in Register R15 to 0b1—sets the serial port to master



Where is this setting in the SigmaStudio project?


• INSEL in Register R19 to 0b1—enables the digital

microphone inputs and disables the ADC inputs"


Where is this setting in the SigmaStudio project?