Zynq SDR Capture Length question!

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jarul
jarul 2020-6-5
评论： jarul 2020-6-19
While using Zynq SDR, the capture length can not exceed '16777216'.
I want to capture length longer than the prescribed. I get the following error.
Error using comm.libiio.AD9361.rx/capture
Requested capture length (23592960 Samples) exceeds maximum value for this number of channels
(16777216 Samples). Use 'EnableOversizeCapture' to risk compromising data contiguity in return for a
larger capture length.
How to use 'EnableOversizeCapture in order to capture longer length than the one prescribed.
Thanks.

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采纳的回答

Jyotsna Talluri
Jyotsna Talluri 2020-6-8
You can just enable the property'EnableOversizeCapture' by setting it to true.In addition to the other arguments of capture function,specify it as a name -value pair.
capture(rxsdr,'EnableOversizeCapture',true);
Refer to the below documentation link for more information
https://www.mathworks.com/help/supportpkg/plutoradio/ref/plutoradio.sdrrxpluto.capture.html#namevaluepairs

更多回答（1 个）

jarul
jarul 2020-6-9
I have another question related to the above issue.
When I tried to transfer rather large size, I get the following error.
Generating WLAN transmit waveform:
Error using comm.libiio.AD9361.tx/validateInputsImpl
The maximum samples per frame for the selected channel mapping is 16777216.
Error in comm.libiio.AD9361.tx/transmitRepeat
Error in OFDM_SIM1 (line 189)
sdrTransmitter.transmitRepeat(txWaveform);
How do I overcome the above error? It seems to me that I can not have the samples per frame more than 16777216.
  2 个评论
Neil MacEwen
Neil MacEwen 2020-6-16
Hi Jarul,
Both transmitRepeat and capture methods use on-board storage, which is size-limited. When you select "EnableOversizeCapture" you are choosing to stream data to the host, instead of capturing it on on-board storage first - this is why you are no longer guaranteed contiguity, as you may lose samples over the Ethernet link.
Likewise, on the transmit side, the only way you can send a frame of a size larger than the 16M limit is by attempting to stream in real-time from the host, instead of using transmitRepeat. Again, you will not be guaranteed contiguity, and are likely to see performance issues (dropped samples).
Thanks,
Neil
jarul
jarul 2020-6-19
Thanks for your response. Appreciate very much!

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