On 08/10/2021 05:07 PM, Jonathan Tobin wrote:
To follow up,
This seems to be the limit now that I have updated to UHD 4.1.0.1:
[ERROR] [0/Radio#0] Requesting too many samples in a single burst!
Requested 18446744028430598144, maximum is 281474976710655.
This occurs with the key arguments: --rx-rate 4.8e6 --rx-subdev "A:0
A:1 B:0 B:1" --rx-channels "0,1,2,3" --nsamps 2880000000
The nsamps value is for 10 minutes of recording (sample rate * 60
seconds * 10 minutes).
Thanks,
Jonathan
Right. Because that *example* program uses the NUM_SAMPS_AND_DONE
streamer type, which requires that the *RADIO* keep track of the
number of samples you're interested in. That was extended from
32-bits to 48 bits.
You'll note that txrx_loopback_to_file will simply run continuously if
you *dont* specify --nsamps, because it uses two different streaming modes:
// setup streaming
uhd::stream_cmd_t stream_cmd((num_requested_samples == 0)
?
uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS
:
uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
You can then just interrupt it when you're done or add some code to see
if you have enough samples, even when you're running continuously
or see if enough time has elapsed, etc, etc.
Contrast with rx_multi_samples:
// setup streaming
std::cout << std::endl;
std::cout << boost::format("Begin streaming %u samples, %f seconds
in the future...")
% total_num_samps % seconds_in_future
<< std::endl;
uhd::stream_cmd_t
stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
Same comment as above. You can modify this to run continuously, and
then have the sample-gather loop exit when it is satisfied that it has
enough samples--either because enough time has elapsed or a sample
counter has reached a certain value.
The UHD API is diverse. There's no possible way that the handful of
*example* programs can possibly satisfy every use case, and that's simply
not design intent. Some programming may be required.
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