Re: [USRP-users] GPIO setup via gnuradio

[Michael Dickens]

Hi Ivan - I'm assuming you mean configure and control a USRP's GPIO via UHD in GNU Radio?

In theory this should be possible, at least in C++ and of course it requires that the specific USRP have GPIO ... 

I'm not sure if there's a Python GPIO API as of UHD 3.15, but if there is then that method should work about the same as the C++ method.

You'd have to get access to the instantiated USRP object, then you can use that object to issue GPIO related calls. See these pages for more info about GPIO in UHD:

< https://files.ettus.com/manual/page_gpio_api.html >

< https://kb.ettus.com/Synchronizing_USRP_Events_Using_Timed_Commands_in_UHD#Example:_Using_Timed_Commands_to_Control_GPIO >

< https://github.com/EttusResearch/uhd/blob/master/host/examples/gpio.cpp >

I can't think of a current GNU Radio block that handles UHD USRP GPIO. If you look around & can't find one, then you'd need to create a custom GNU Radio block to handle this. You would pass your new block the USRP object, which you'd then use for the GPIO calls ... using Python or C++ depending on which API is available for your specific UHD.

Maybe there's another way that I don't know of? If so hopefully others will add to the discussion!

Hope this is useful! - MLD

On Fri, Apr 17, 2020 at 9:15 AM Ivan Zahartchuk via USRP-users <address@hidden> wrote:

Hello. Please tell me if it is possible to configure GPIO using gnuradio. I want to use RFNOC blocks and switch an external device using GPIO

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