I have two X440 w/ X4_200 FPGA image. I need to get consistent phase between
channels on USRP1 and USRP2 across multiple runs. I must be doing something
wrong because I observe consistent phase between channels on any ONE USRP, but
not across two. The phase appears to be random between the two on each run.
Here's my setup:
*
Common 10 MHz and 1 PPS
*
Addr0=192.168.10.2,second_addr0=192.168.11.2,mgmt_addr0=192.168.1.10,addr1=192.168.15.2,second_addr1=192.168.16.2,mgmt_addr1=192.168.1.20,time_source=external,clock_source=external
*
I modified the 'stock' rx_samples_to_file as follows:
*
Usrp->set_time_next_pps(uhd::time_spec_t(0.0));
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
*
usrp->set_command_time(uhd::time_spec_t(COMMAND_START_S, 0));
// Set the rate, freq, gain, etc
std::this_thread::sleep_for(std::chrono::milliseconds(COMMAND_START_S * 1000));
usrp->clear_command_time();
*
Each streamer is created in a separate thread
*
stream_cmd.stream_now = false;
// Time was reset to zero before thread was created
stream_cmd.time_spec = uhd::time_spec_t(STREAM_START_S, 0);
rx_stream->issue_stream_cmd(stream_cmd);
What am I missing? I assume commands apply to both USRPs since I create a
multi_usrp. Do I need to explicitly specify the motherboard for some of the
commands?
Eugene Grayver, Ph.D.
Principal Engineer
310-336-1274
_______________________________________________
USRP-users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
