gr-funcube is an linux oot-module for gnuradio to implement a funcube dongle and a funcube dongle pro+ source.
On linux it autodetects the correct soundcard from /proc/asound/cards.
This idea was taken from the osmosdr drivers.

To control the device the hidapi usb version is used.

1. Dependencies:
    
   gnuradio (>= 3.10 ) with pybind
   alsa usb drivers activated
   hidapi-libusb

2. Installation:
    
   The build process is cmake based.
   So get the latest code from https://github.com/dl1ksv/gr-funcube
   and change to the code directory. There
    
   mkdir build
   cd build
   cmake -DCMAKE_INSTALL_PREFIX= "path to gnuradio installation" ../
   make
   su
   make install
    
   After that executing grc you'll find in the section Funcube
    
   Funcube Dongle
   Funcube Dongle control
   Funcube Dongle Pro+
   Funcube Dongle Pro+ control

   Hint:
   You can install gr-funcube to an other directory than "path to gnuradio installation". But then you have to add the location of your python modules to the PYTHONPATH environment variable and add the location of the lib to the LD_LIBRARY_PATH environment variable.

   To see the newly created blocks in grc you have to set the local_blocks_path entry in ~/.gnuradio/config.conf. Example: If you choose /usr/local/oot as installation directory, you have to set local_blocks_path = /usr/local/oot/share/gnuradio/grc/blocks

3. Important:
    
   Don't forget the udev rules:
   For instance:
    
   ## Udev rules for the Funcube Dongle Pro (0xfb56) and Pro+ (0xfb31)
   ## HIDAPI/libusb:
   SUBSYSTEMS=="usb" ATTRS{idVendor}=="04d8" ATTRS{idProduct}=="fb56" MODE:="0666"
   SUBSYSTEMS=="usb" ATTRS{idVendor}=="04d8" ATTRS{idProduct}=="fb31" MODE:="0666"
   ## HIDAPI/hidraw:
   KERNEL=="hidraw*", ATTRS{busnum}=="1", ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="fb56", MODE="0666"
   KERNEL=="hidraw*", ATTRS{busnum}=="1", ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="fb31", MODE="0666"

4. Installation example for Ubuntu
    
   cd $HOME
   sudo apt install libusb-1.0-0-dev libudev-dev libhidapi-dev
   gnuradio-config-info --prefix
   git clone https://github.com/dl1ksv/gr-funcube.git
   cd $HOME/gr-funcube
   mkdir build
   cd build
   cmake -DCMAKE_INSTALL_PREFIX=<prefix from gnuradio-config-info> ../
   make
   sudo make install
   sudo ldconfig
   cd /etc/udev/rules.d
   sudo cp $HOME/gr-funcube/50-funcube.rules ./
   sudo udevadm control --reload-rules
   sudo udevadm trigger
    
    
   The names of the packages that are required for build may differ between Linux distros.

5. Usage
    
   Four modules are available:
    
   fcd_control
   fcd
   fcdpp_control
   funcube
    
   The control modules only controls the dongles, while the other modules control the dongles and provide the IQ samples. All modules accept messages to control the frequency. That was the reason to introduce the control modules.  
   The fcd modules where introduced, as gnuradio 3.8 does not contain gr-fcd any longer.
   See the examples of a simple fm receiver in the examples directory or see a more complex example in in gr-display

6. Credits
    
   Some code is taken from qthid-4.1 by Alexandru Csete, OZ9AEC.
   Thanks to Michael Dickens, who gave valuable hints for implementing message in hier2_blocks.
   Thanks to Barry Duggan for the installation example for Ubuntu