AXI XADC access to Aux4 and Aux12 pins via MicroBlaze

[PeterM]

Hi:

I was wondering if anyone has used the MicBlaze - AXI based access to the XADC to communicate with the AUX4 (XSM_CH_AUX4??) and AUX12 (XSM_CH_AUX12??) channels.  Based on my read of the XADCdemo.sv   and the comments, I guess the CMOD A7 analog inputs to be the XSM_CH_AUX 4 and 12 channels.  I seem to be missing something with regards to how to initialize them.

Thoughts?

Peter

[jpeyron]

Hi Peter,

On page 48 of the pdf here it describes how to enable aux 4 and 12 as well as describes the process on how to set up the channels. Hope this helps.

cheers,

Jon

[PeterM]

Hi Jon:

 

Thanks.  It turns out that I was not putting a reference voltage on my external circuit to create a level for the aux4 and aux12 pins to see.  I am also going to give your pdf a read as I am not completely satisfied with the calibration.

 

Peter