USRP E312 (AD9361) - IIO Oscilloscope doesn't work

Question

I tried using IIO oscilloscope with the SDR E312 from Ettus, I use the code from my previous thread USRP E312 (AD9361) - ad9361_dig_tune_delay: Tuning RX FAILED! thanks to danmois with this commit . 
 Then I enable IIO_SUPPORT, it works with the following result: 
 cf-ad9361-lpc: Successfully initialized (61439514 Hz)
ad9361_init : AD936x Rev 2 successfully initialized
Sampling frequency is: 30720000
New sampling frequency is: 15360000
LO frequency of TX is: 1000000000
Output port TX: 0
Power state of Tx: 1
cf-ad9361-dds-core-lpc: Successfully initialized (30718994 Hz)
�Running TinyIIOD server...
If successful, you may connect an IIO client application by:
1. Disconnecting the serial terminal you use to view this message.
2. Connecting the IIO client application using the serial backend configured as shown:
Baudrate: 921600
Data size: 8 bits
Parity: none
Stop bits: 1
Flow control: none 
 However, on my computer IIO Oscilloscope doesn't work. I have the same problems than NicoleDuarte in this thread serial connection with iio oscilloscope . 
 For example when installing IIO oscilloscope with this link IIO Oscilloscope , i can't choose Serial Content. 
 According to buha , I reinstalled libiio with the command: 
 analog@precision:~/libiio$ mkdir build
analog@precision:~/libiio/build$ cd build
analog@precision:~/libiio/build$ cmake ../ -DWITH_SERIAL_BACKEND=ON
analog@precision:~/libiio/build$ make -j
analog@precision:~/libiio/build$ sudo make instal 
 Thus, i have the error Could not get IIO Context: inappropriate ioctl for device ... 
 
 So I tried to build libserialport with the link https://sigrok.org/wiki/Libserialport and the post of buha with the command: 
 $ ./autogen.sh
$ ./configure --prefix=/usr
$ make
$ sudo make instal 
 but I'm stuck at ./autogen.sh, I get the following error: 
 /path/to/libserialport$ ./autogen.sh
/bin/sh: 0: Illegal option - 
 How can we solve this problem? Thank you very much for your time, 
 Regards, 
 R&eacute;mi

csuteu · Accepted Answer

This is because the fix that resolved this issue is not included in version 0.1.1 of libserialport. 
 Could you try to build this specific commit instead of building the ma ster branch ? 
 git clone https://github.com/sigrokproject/libserialport.git 
 cd libserialport 
 git checkout 6f9b03e 
 ./autogen.sh 
 ./configure --prefix=/usr 
 make 
 sudo make install 
 Then you will have to rebuild libiio, and osc once again. 
 Let me know if this works for you. 
 Thanks. 
 -Cristina)

csuteu · Answer

The first thing that you want to do, is get a clean envinroment. It is possible that even though you have installed the correct version of libserialport at /usr/ location (the one that you compiled from the specific commit), the package that you installed via apt-get is still in the /lib/x86_64-linux-gnu , thus causing libiio to link to it and your subsequent error. 
 My recommendation is this : delete every instance of libserialport that is on your machine (in /usr/ ; in /lib/x86_64-linux-gnu ; etc). After this, rebuild the specific commit of libserialport as indicated. Install the rest of libiio's dependencies but make sure that you SKIP installing libserialport via apt-get. 
 Then you can proceed to build libiio and IIO-Oscilloscope. If you're still using Ubuntu 20, then please pay attention to not install libgtkdatabox via apt-get. 
 Instead you will have to do the following: 
 wget https://downloads.sourceforge.net/project/gtkdatabox/gtkdatabox-1/gtkdatabox-1.0.0.tar.gz 
 tar xvf gtkdatabox-1.0.0.tar.gz 
 cd gtkdatabox-1.0.0 
 ./configure 
 (sudo) make install 
 
 If you have managed to build the app, please mark one of the replies as an answer to this thread. Alternatively, if you figured out another solution on your own, please reply with it and mark that as an answer. 
 
 Thank you. 
 --Cristina

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USRP E312 (AD9361) - IIO Oscilloscope doesn't work