[USRP-users] B200 mini chirp generation

Michael West michael.west at ettus.com
Mon Mar 14 17:40:26 EDT 2016


Hi Xingjan,

There is no need to modify the FPGA.  Take a look at the tx_bursts example
for how to send repeated bursts with deterministic timing.  Timing is
controlled by setting the time_spec in the tx_metadata_t structure.

Regards,
Michael

On Mon, Mar 14, 2016 at 1:56 PM, Xingjian Chen via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hi,
>
> Have you guys try to continuously transmit a Chirp by B200 ? I am using
> tx_samples_from_file.c and coding in FPGA. What I did is that build a
> custom_dsp_tx.v like N210, save the chirp waveform in a register and trying
> to send that. However, my problem now is that I cannot send it
> continuously. (I can send it repeatedly by setting tx_samples_from_file.c.
> But that is not really continuously repeated since cpu timing is not
> deterministic). One point is that the tx signal is controlled by an enable
> signal generated by new_tx_control module. I don't know how to modify that.
> It always leads to "RuntimeError: CODEC loopback test failed."
>
>
> Xingjian Chen
> _______________________________________________
> USRP-users mailing list
> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
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