Issue with Creating Dummy Context for AD9361 Testing Using libiio

[samuel13584]

Hi everyone,

I'm trying to set up and use a dummy project for AD9361 testing. I'm currently using the default example program provided here:
https://github.com/analogdevicesinc/libiio/blob/main/examples/ad9361-iiostream.c

I successfully built the entire libiio repository using the following CMake command, which enables the examples, XML backend, dummy backend, and other relevant options:

cmake ..
-DWITH_EXAMPLES=ON
-DWITH_XML_BACKEND=ON
-DWITH_ZSTD=ON
-DWITH_IIOD=OFF
-DWITH_USB_BACKEND=OFF
-DHAVE_DNS_SD=OFF

The build completed without any issues.

However, when I try to set the dummy environment variables and verify the setup using the following command:

./utils/iio_info -u dummy

I always receive this error:

ERROR: Unable to create IIO context dummy: Function not implemented (38)

It seems like the dummy context is never actually created, and I'm unsure how to proceed from here.

Thanks in advance for your time and support!

[dNechita]

Hi @samuel13584,

Are you using a modified version of libiio where you introduced cmake option WITH_DUMMY_BACKEND? As far as I know, this option doesn't exist.

[samuel13584]

Hello @dNechita,
Indeed, my mistake I tried something in the cmakelist but I clean all my project. I just forgot to delete this argument in my question here ^^

[samuel13584]

I modify the question.
Thank you

[dNechita]

It looks like you are trying to implement your own backend. What changes have you done so far?

[samuel13584]

At this point I didn't change anything, only the ad9361-iiostream.c file with new numeric value for frequency. Now I'm trying to write my own custom backend yes, but I don't know if something easier exists