I think I resolved it; must specify num_samps in the struct (as 0) even if you want to stream continuously.
On Tue, Nov 7, 2017 at 1:21 PM, Sivan Toledo <stol...@tau.ac.il> wrote: > Before this code runs, the TX antenna is set to TX/RX, the RX antenna to > RX2. The radio is a B200. > > On Tue, Nov 7, 2017 at 1:18 PM, Sivan Toledo <stol...@tau.ac.il> wrote: > >> A bit of progress. The error_string might have been used by two threads, >> so I allocated a new buffer for error messages in the thread that starts >> streaming and receives samples. This revealed the error message: TX/RX. >> What is is error? >> >> On Tue, Nov 7, 2017 at 1:06 PM, Sivan Toledo <stol...@tau.ac.il> wrote: >> >>> Hi, >>> >>> I've ported a code from the C++ API to the C API; it runs okay on Linux >>> but fails on Windows. The failure occurs at the function: >>> >>> void radioRxStartStreaming(void) { >>> uhd_stream_cmd_t stream_cmd; >>> >>> size_t n; >>> uhd_rx_streamer_max_num_samps(rx_stream, &n); >>> fprintf(stderr,"### UHD max samples %d ###\n",n); >>> >>> fprintf(stderr,"### starting rx streaming ###\n"); >>> >>> stream_cmd.stream_mode = UHD_STREAM_MODE_START_CONTINUOUS; >>> stream_cmd.stream_now = true; >>> >>> if (uhd_rx_streamer_issue_stream_cmd(rx_stream, &stream_cmd)) { >>> uhd_rx_streamer_last_error(rx_stream, error_string, >>> ERROR_STRING_LENGTH); >>> fprintf(stderr,"### cannot start UHD rx streamer: <%s> >>> ###\n",error_string); >>> } else { >>> fprintf(stderr,"### started rx streaming ###\n"); >>> } >>> } >>> >>> issue_stream_command fails but last_error returns an empty string. >>> The functions uhd_rx_streamer_make(&rx_stream) and >>> uhd_usrp_get_rx_stream(usrp, &stream_args, rx_stream) are called prior to >>> the attempt to start the stream, but from another thread. I am using >>> pthreads in both Linux and Windows (using a pthreads library) and have not >>> had a problem with this with the C++ API. >>> >>> I'm using UHD 3.9.7, installed from uhd_3.9.7-release_Win64_VS2013.exe >>> <http://files.ettus.com/binaries/uhd/uhd_003.009.007-release/uhd_3.9.7-release_Win64_VS2013.exe>. >>> The code is linked against visual studio 12.0 (which I think is VS2013) >>> >>> Any idea what might be going wrong? It's difficult to debug when the >>> error message is empty. >>> >>> Thanks, Sivan >>> >>> >>> >> >
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