Re: [Discuss-gnuradio] Accessing write_eo, write_io in GRC.

[Martin Braun]

Kathy,

those calls were libusrp calls, IIRC. This API was abandoned a long time
ago, and I'm not even sure myself what they exactly do.

You might be able to use set_gpio_attr(), but I can't tell you exactly
how the commands would look like.

M

On 29.09.2015 11:24, Kathy Hertzog wrote:
> Hi everyone!
> I have a GNURadio project running on Kubuntu 14.04 using  GNURadio
> Companion   v3.7.2.1 along with several OOT blocks that I wrote. (I know
> I'm a bit behind on the releases.) A lot of the code was originally
> written in v3.6 so some of what follows may be me conflating old
> interface with newer.
> 
> I have custom hardware that uses Ettus USRP boards. I've been bypassing
> the custom front-end and just adjusting the expected center frequency on
> the UHD: USRP Source block but now I'd like to actually control the
> hardware. That means I'd like to access the write_eo() and write_io()
> calls so I can enable and initialize the output pins on the USRP and
> write to an external PLL LO for down conversion to set frequency.
> 
> My 3.6-based code just called write_io from the usrp instance in C++ code.
> 
> But I can't figure out how to get to the USRP write_eo and write_io
> calls from a 3.7.2.1 GNURadio Companion starting point. I've tried
> adding code to the Python output of GRC like this:
> 
>    ###
>    self.u = uhd.usrp_source( device_addr="fpga=usrp1_fpga_4rx.rbf",
>                                          
> stream_args=uhd.stream-args(cpu_format="fc32",
>                                                                
>  channels=range(4),),)
> 
>    # I added this line to GNURadio Companion output code
>    self.u.write_oe (1, 0xFFFF, 0xFFFF)
>    ###
> 
> but Python can't find the write_oe or write_io methods.
> 
> Am I missing an import in Python? A path?  Is there anyway to do this in
> the GRC blocks so I don't have to modify the output Python? Do I have to
> do this as an OOT block and call the uhd usrp make myself? (although I
> don't see the write_io or write_oe methods in usrp_source.h anymore)
> 
> Thanks in advance,
> Kathy Hertzog
> 
> 
> 
> 
> 
> 
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