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How to increase waveform buffer on ADRV9371/ZC706

Question asked by rbbris on Feb 21, 2018
Latest reply on Feb 26, 2018 by rbbris

Hi,

We are using the ADRV9371 /ZC706 evaluation platform to play out waveforms through the AD9371. The waveform buffer on the evaluation platform is currently limited to about 4M samples. We have a need for longer waveforms. Our FPGA engineer says the waveform buffer is implemented by a DDR controller which looks like it is programmed to read out buffers of up to 2^24 bytes from the DDR memory. He says it can theoretically programmed in "2D" mode where it can handle N rows of 2^24 bytes.

As the software writer I am not sure where to start. I currently use the IIO library to access this buffer:

  • iio_device_create_buffer() to create the buffer
  • iio_buffer_first()  to get pointers to the start of I and Q channels
  • iio_buffer_push() to start playing the waveform out.

This works very well.

How do I get access to lower level devices, drivers or registers to program the DDR controller allow longer buffers?

Or is there another way of achieving what we need?

Thank you

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