Re: [Discuss-gnuradio] howto to set the mux in usrp1

[Josh Blum]

On 05/26/2013 05:49 AM, Wolfgang Buesser wrote:
> Hi josh,
> 
> thank's for the hint - but this is not quite what I want to do:
> 
> In the future I want to use 4 separate inputs - this is for a
> network-analyzer with 2 directional couplers for S11, S21, S12, S22.
> For a start I want to use only RX-board A with 2 different signals on
> both inputs. This implies that the Q-inputs of the DDCs must be
> connected to 0.
> 
> I guess the subdev spec would be:
> 
> "A:A A:B" ?
> 
> What would be the setting to use all 4 input?
> 

A:A A:B B:A B:B

The first element is the dboard name, the second is the frontend name.
This is the mapping for DDC0 to DDC3

-josh

> Thanks
> 
> Wolfgang
> 
> On 05/26/2013 05:00 AM, Wolfgang Buesser wrote:
>> Hello,
>>
>> I using a usrp1 populated with 2 LF-RX and 2 LF-TX.
>> I want to use 2 DDCs the I-inputs of which are connected to the 2 ADCs on 
>> LF_RX A (Q-inputs to gnd).
>>
>> In pre-uhd times I used to use set_mux, but now the API seems to have 
>> changed.
>> The following code produces the error message:
>>
>> AttributeError: 'uhd_usrp_source_sptr' object has no attribute 'set_mux'
>>
>> How can I control the mux in the RX-path of the usrp1?
>>
> 
> Set the subdevice specification to "A:A B:A". This maps the DDC0 to
> dboard A, frontend A and DDC1 to dboard B, and frontend A.
> 
> -josh
> 
>> Wolfgang
>>
>>
>> #!/usr/bin/python                                                            
>>  
>>                                                                              
>>  
>>                                                                              
>>  
>>                                    
>>
>> from gnuradio import gr
>> from gnuradio import uhd
>> from gnuradio.eng_option import eng_option
>>
>>
>> class build_block(gr.top_block):
>>     def __init__(self):
>>         gr.top_block.__init__(self)
>>
>>         self.u_tx = uhd.usrp_sink("serial=47432785",uhd.stream_args('fc32'))
>>         self.u_tx.set_samp_rate(8.0e6)
>>         self.siggen_tx = 
>> gr.sig_source_c(self.u_tx.get_samp_rate(),gr.GR_CONST_WAVE,0, 1.0, 0)
>> #        self.head_tx   = gr.head(gr.sizeof_gr_complex, 1000000)             
>>  
>>                                                                              
>>  
>>                                                                              
>>  
>>                                    
>>         self.head_tx   = gr.head(gr.sizeof_gr_complex, 1000)
>>         self.u_tx.set_subdev_spec("A:AB",0)
>>         self.u_tx.set_center_freq(10e6)
>>
>>         self.u_rx = 
>> uhd.usrp_source("serial=47432785",uhd.stream_args('fc32'))
>>         self.u_rx.set_mux(gru.hexint(0xf0f0f1f0))
>>         self.u_rx.set_center_freq(10e6+1e3)
>>         self.head_rx_0 = gr.head(gr.sizeof_gr_complex, 1000)
>>         self.dst0 = gr.file_sink(gr.sizeof_gr_complex, "r.dat")
>>
>> #       self.di = gr.deinterleave(gr.sizeof_gr_complex)                      
>>  
>>                                                                              
>>  
>>                                                                              
>>  
>>                                    
>>
>>         self.connect (self.siggen_tx,self.head_tx, self.u_tx)
>>         self.connect (self.u_rx,self.head_rx_0,self.dst0)
>>
>> tb = build_block ()
>> tb.run ()
>>
>>
>>
>>
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>>
> 
> 
> 
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