USRP Transmit on Side B?

Hi,

I try to transmit using the Side B of the USRP and it is not working.
(With
LFRX or RFX400 dboard)
The Side A work perfectly like the two side in reception.
I use directly the C++ USRP drivers.

Do you have any idea why it is not working or any suggestion to try?
Special options to set?

Thank you

Maxime

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Hi Maxime,

This is a pretty difficult question for people to answer without your
code for the C++ drivers yet. But, since you’ve shared it with me… :slight_smile:

On line 50 of USRP_Interface_tx.cpp, you’re calling
usrp_standard_tx::make() with nchannels set to 1. This is the third
parameter… try setting it to 2 and then using the appropriate mux.

I’m still trying to get the 2400 board working after I added my support
to your code for it.

Eric and Jonathan, it would probably be very useful to re-use a lot of
this code and pulling it in to the project for C++ daughterboard
support. It is far from following the GR coding conventions, but I
could work with Maxime on fixing this up. Maybe when he wants to
release it when he’s done with his project, we can go over the general
structure and everything.

  • George

On Thu, Dec 06, 2007 at 03:06:32PM -0500, George N. wrote:

Hi Maxime,

This is a pretty difficult question for people to answer without your code
for the C++ drivers yet. But, since you’ve shared it with me… :slight_smile:

On line 50 of USRP_Interface_tx.cpp, you’re calling
usrp_standard_tx::make() with nchannels set to 1. This is the third
parameter… try setting it to 2 and then using the appropriate mux.

Setting nchannels to 2 has ABSOLUTELY NOTHING TO DO WITH THE B SIDE,
it has to do with receiving 2 DDC streams.

I suggest that Max ensure that he’s looked at the inherited python
code in the daughterboard hierarchy. He may be using the wrong i2C
address or something similar. Is the rx mux set up properly to route
the samples from the B side A/Ds into DDC 0?

Eric

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