On 03/08/2018 08:33 AM, Brandon Piner via USRP-users wrote:
To whom it may concern
I have been implementing a transmitter and receiver application using
the B200 mini with UHD-3.9.7. The transmitter seems to be working
well. The strange behavior seems to be happening when I try using the
receiver.
1. The predominant issue I am having is that I keep getting an
overflow after X samples were read. The specific number of samples
("X") before an overflow seems to be linked to the samples per
packet "spp" or the "receive_frame_size" parameter. If I leave the
"spp" and "receive_frame_size" as default then it seems that the
max samples per buffer per packet is 2044. So each ->recv of
samples returns 2044 samples. I can call ->recv 30 times and 2044
samples are returned. On the 31st time calling ->recv I only 389
samples along with some timestamp mismatch of approx 65 uS. The
32nd read flags an overflow and 0 samples are read. This "cycle"
reads 61709 samples in total. Seems like it is filling a flat
buffer and not a circular buffer. Is this the expected behavior of
the device? How can I get it to not overflow?
Is the above sample-rate linked, or does it happen regardless? If it
happens regardless, then I suspect that you have an off-by-some-amount error
somewhere in your code that is causing buffers to become
exhausted--you're not vacuuming out all available data.
1.
2. The other issue is with starting up a receive stream. I documented
it here
https://github.com/EttusResearch/uhd/issues/68#issuecomment-369596794
. Not sure if anyone can assist with that. My current workaround
is to destroy the entire sptr to the USRP and create a new pointer
at the time that I start the receive stream.
Hope someone can provide me with some insight!
Kind regards
Brandon
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