Re: [USRP-users] Overflows at flowgraph start using gr-uhd

2020-11-19 Thread Josh via USRP-users
Starting to get an idea what is going on with the startup overflows First, suppose I have a raw UHD application that does the following: { instantiate usrp object, set freq, gain, samp_rate issue stream cmd to start some time in the future (2 sec) while(1) { call _rx_stream->recv()

Re: [USRP-users] Overflows at flowgraph start using gr-uhd

2020-11-19 Thread Josh via USRP-users
Same deal - with "num_recv_frames=128,master_clock_rate=" + str(samp_rate*4) I still get "ODD", just about every time. On Thu, Nov 19, 2020 at 6:52 AM Ron Economos via USRP-users < usrp-users@lists.ettus.com> wrote: > The automatic setting of the master clock seems to be getting in the way >

Re: [USRP-users] Overflows at flowgraph start using gr-uhd

2020-11-19 Thread Josh via USRP-users
Marcus, This is naked hardware - B210 usb into a pretty beefy laptop running Ubuntu 20.04, GNU Radio latest master (3.9) Even with num_recv_frames = 128, still getting "ODD" at startup of the flowgraph Any other optimizations I should be tuning? Getting no overruns in the steady state, just at

Re: [USRP-users] Overflows at flowgraph start using gr-uhd

2020-11-18 Thread Marcus D. Leech via USRP-users
On 11/18/2020 07:27 AM, Josh via USRP-users wrote: I'm seeing a difference in behavior between gr-uhd and plain uhd c++ api: Setup: B210, 2 channels, 5MSPS, master_clock_rate 20MSPS, PPS sync Receive only flowgraph With gr-uhd, there is always a "OOD" when the flowgraph first starts But, if I

[USRP-users] Overflows at flowgraph start using gr-uhd

2020-11-18 Thread Josh via USRP-users
I'm seeing a difference in behavior between gr-uhd and plain uhd c++ api: Setup: B210, 2 channels, 5MSPS, master_clock_rate 20MSPS, PPS sync Receive only flowgraph With gr-uhd, there is always a "OOD" when the flowgraph first starts But, if I replicate the setup in a simple compiled program