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Picozed. Transmit data and Receive data

yahniukov

I have PicoZedTm SDR SOM Z7035/AD9361 Development Kit. I need to have opportunity to create firmware to work with AD9361 without libiio or matlab.

 

I have read the list of baremetal functions here https://wiki.analog.com/resources/eval/user-guides/ad-fmcomms2-ebz/software/baremetal and saw the files here https://github.com/analogdevicesinc/no-OS/tree/master/ad9361/sw/platform_xilinx .

 

Now I know how I can set LO frequency of a port or bandwidth of a port.

 

In https://github.com/analogdevicesinc/no-OS/blob/master/ad9361/sw/platform_xilinx/dac_core.c I see dac_write and dac_read functions. If I understand right, it should help me with transmit data.

There are source of dac_write:

 

Xil_Out32(AD9361_TX_0_BASEADDR + regAddr, data);

 

I understand what is 'regAddr'. I can see list of DAC registers here https://github.com/analogdevicesinc/no-OS/blob/master/ad9361/sw/platform_xilinx/dac_core.h or here https://wiki.analog.com/resources/fpga/docs/hdl/regmap .

But I can't understand what the register I need to just send data to radio broadcast. For example I have the number 0xFF and I want to send it to DAC and then to transmitter. What the register am I need?

  • 0

    The AD9361 translates between the digital complex baseband and analog RF domains. The complex baseband signals at the AD9631 digital interfaces must be created/processed by a physical layer transceiver implemented elsewhere - the AD9361 does not implement a PHY Tx or Rx. In order to send/receive a message you must translate that message into a suitable complex baseband waveform (physical layer Tx) and process the received waveform to reconstruct the message (physical layer Rx). These are the fundamental operations of a digital communications system. 

     

    You must choose an environment for building your physical layer Tx/Rx. For example the PZSDR natively supports constructing/processing waveforms in MATLAB (Mathworks has lots of digital comm examples) and GNU Radio (many example designs available). You can also build a custom physical layer transceiver in the PL fabric of the Zynq on PZSDR (probably the hardest option). ADI also provides a demo design for the ZC706 that implements a simple PHY in the PL: A simple BBP for RF Transceivers (it's unclear whether this design will be maintained or how feasible it is to port to PZSDR).

     

    Whatever environment you choose, you should be able to simulate the end-to-end link (message - PHY Tx - complex waveform - PHY Rx - message) before trying anything in hardware.