ZCU216 PYNQ Radio Receiver - Only Getting 2 Non-Zero Samples in DMA Buffer

[marioruiz]

Hi @Xingda_Chen,

Welcome to the PYNQ community.
I am not an expert in RFSoC, however, I can tell you that I see a few issues with the DMA. First, the tlast is set to a constant, which from the results, I assume may be one. This is not correct. Second, the tkeep is unconnected, which mean it is being tied to 0.

You will need to create extra logic to set tkeep to all ones, and only set tlast in the appropriate beat, this will be at 512 samples (16-bit) each.

I wrote an extensive DMA debug post.

Debugging Common DMA Issues [Part 3]

Debugging Common DMA Issues If you frequent the PYNQ forum, one of the most common questions/issues we get is why DMA transfer do not work. In part 3 of this series, I will reproduce these issues and use both the register_map and ILA to identify and address these issues. DMA channel not started Often, we see users reporting something like this. --------------------------------------------------------------------------- RuntimeError Traceback (most recent call last) Input In [4], in <cell line:…

Mario