[Discuss-gnuradio] Re: dbsrx question

[Dlaniger Repooc]

David Caruth wrote:
> Hi All.
> 
>   I've been trying to use the DBSRX daughterboard in slot A but am 
> running into some trouble while reading the status bytes of the Maxim 
> chip via i2c.  The code I'm using to control the USRP is written in 
> Visual C++ 2005, and I've been able to talk to the TVRX daughterboard 
> with no problems.  I added the c++ code to mimic the set_freq, set_gain, 
> etc... commands in db_dbs_rx.py, and seem to be able to adjust the gain 
> and bandwidth for the Maxim chip ok.  The problem comes when I try to 
> use the set_freq command, which does a read_i2c which returns the two 
> status bytes as ints.  I've done a side-by-side comparison with the 
> python script running on the same machine under Windows XP where I 
> monitor the register number and the value as commands are sent, and I 
> see my code executing exactly the same as the python script usrp_fft.py, 
> except that the status bytes returned by my code are 0, 127 as opposed 
> to the returned bytes in the python code of 8, 127.  I don't think I'm 
> doing
>  anything dumb with char to int conversions either in my code.  Because 
> I get 0 for the first byte all the time, my while loop to set the 
> adc_val continues until it returns false, and the frequency never gets 
> set.  The python script usrp_fft.py runs with no problems and I can 
> set_freq just fine.  I have searched this forum for i2c errors and dbs 
> problems, but have not found anything like my problem.  I'm sure I have 
> the correct i2c address set as well.  Any suggestions?  Please don't 
> suggest that I just use the python script... :)
> 
>   Thanks a lot!

David,

I am trying to setup USRP w/RFX2400 db to work in visual C++.

Would I be able to get a copy of your Visual C++ code to use as a 
guidline on what to do?

Thanks
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