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FMCOMMS1-ZedBoard (no OS) constellation rotation

Question asked by hfm on Jun 11, 2015
Latest reply on Jul 9, 2015 by rejeesh


I started working with FMCOMMS1 using ZedBoard. I follow the steps AD-FMCOMMS1-EBZ Quick Start Guide on Xilinx FPGA Board Without OS [Analog Devices Wiki] to build the project. All seems to work fine, including the sinewave example.

In my project I need to send a IQ constellation and received it back so I use the function 'dac_dma_setup' to send a simple QPSK constellation in look back just like the sinewave example to check his behavior and the constellation have a non fixed rotation and I'm not expecting that.

There are some XCOMM function or other method that I can use to calibrate the FMCOMMS1 to correct this?

I can handle the fix rotation but this non fix rotation I can't understand because the system is in look back with a cable.



Helder Machado