ADRV9009: Alignment of data transmission (Tx) and reception (Rx)

mgr@ad on Mar 11, 2019

Hello,

we want to use the IIO library (libiio) to control the ADRV9009 transceiver chip within our own application running on the ZCU102 board. We know the functions 'iio_buffer_push' and 'iio_buffer_refill' to send samples to the hardware (ADRV9009) and fetch data from the hardware.

My question is: If the samples (uploaded by 'iio_buffer_push') are transmitted cyclically, how can we start the reception of samples (by calling 'iio_buffer_refill' or another function) exactly when the first sample of one cycle is transmitted?

Thanks in Advance & Best Regards

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travisfcollins
Mar 11, 2019 +1 verified
There is no correlation between transmit and receive buffers from the perspective of software. Everything is best effort. When space is made in the receive buffers (like when a refill request happens)…

+1 travisfcollins

on Mar 11, 2019 5:14 PM over 2 years ago
There is no correlation between transmit and receive buffers from the perspective of software. Everything is best effort. When space is made in the receive buffers (like when a refill request happens), the receive DMA will allow data to fill into memory, but it's rather difficult or impossible to do at specific samples.

If you need this tight coupling of samples, you will need some custom logic in the FPGA fabric.

-Travis
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0 mgr@ad on Mar 12, 2019 1:10 PM over 2 years ago in reply to travisfcollins

Thanks for the quick response. I hope we can find a solution without too much effort required for customization of the FPGA logic.
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