Re: [Discuss-gnuradio] [USRP-users] How to use RX1 channel on USRP

Hi Ben,

Thanks for your reply.

On RX1 channel, I've added a demodulation module. The demodulator get data from the cordic_z24 module (via clip_reg module) and out to dsp_rx_glue module (you can see on the attacked file). The data rate on RX1 depend on the symbol rate of demodulator.

I can't get only data from RX1 on PC. Therefore, on PC, I've configured UHD to receive data from both channel (RX0 and RX1) with sample_rate is 5Msamples/s (160 Mbit/s), data rate of RX1 is 18Mbit/s. One error appeared when program run:

UHD Error:

    The receive packet handler failed to time-align packets.

    67936 received packets were processed by the handler.

    However, a timestamp match could not be determined.

Could you help me to get only data from RX1 or both RX0 and RX1 channel, please?

Thanks.

Best regards.

LTP

On Tue, Nov 26, 2013 at 5:05 AM, Ben Hilburn <ben.hilburn@ettus.com> wrote:

Hi LTP -

If you modified the FPGA code for that channel, it is impossible for us to know how you might have changed things, and what the effect might be.

If you post your modified code for others to review, we might be able to help you more. That said, we really can't support custom implementations, since it is your application.

What led you to modify the code? Was there something about the stock images that didn't do something you needed?

Cheers,

Ben

----------------------------

Ettus Research, LLC   |   USRP

On Thu, Nov 21, 2013 at 5:40 PM, Luong Tan Phong <phonglt03@gmail.com> wrote:

Hi Lists,

I've modified RX1 channel on USRP N2xx FPGA sources, and data rate on RX1 is difference with RX0 (don't change RX0 channel because RX0 channel will be use for other task).

Could you tell me how to receive data from RX1, please?

Any of your advice to help me would be greatly appreciated.

Thanks so much.

Best regards,

LTP.

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