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Signed-off-by: Volker Schroer <>

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gr-fcd is no longer part of gnuradio. So I decided to stop maintaining gr-fcdproplus and set up a new oot gr-funcube. gr funcube contains the drivers for both the fcd and the fcdproplus dongle.

So you should use gr-funcube instead of gr-fcdproplus in the future.

gr-fcdproplus is an linux and OSX addon 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 ( 3.8 )
  • alsa usb drivers activated
  • hidapi-libusb

If the hidapi lib of your distro is installed then this hidapi version is used. Otherwise bundled code will be used. In case of MAC OSX this is hidmac.c otherwise hid.c ( This new MAC Version is untested, due to a lack of access to MAC OSX. So reports of success or bugs are welcome. )

  1. Installation:

get the latest code from

The build process is cmake based. So change to code directory. There

$mkdir build

$cd build

$cmake -DCMAKE_INSTALL_PREFIX=<where gnuradio is installed> ../



$make install

After that you'll find in grc in Custom - Fcd Funcube Dongle Funcube Dongle control Funcube Dongle Pro+ Funcube Dongle Pro+ control

  1. Important

Don't forget the udev rules: For instance:

Udev rules for the Funcube Dongle Pro (0xfb56) and Pro+ (0xfb31)


SUBSYSTEMS=="usb" ATTRS{idVendor}=="04d8" ATTRS{idProduct}=="fb56" MODE:="0666" SUBSYSTEMS=="usb" ATTRS{idVendor}=="04d8" ATTRS{idProduct}=="fb31" MODE:="0666"


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"

  1. Usage

Four modules are available:

  • fcd control
  • fcd
  • fcdpp_control
  • fcdproplus

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 at the moment.

See the examples of a simple fm receiver in the examples directory or see a more complex example in in gr-display

  1. Credits

Some code is taken from qthid-4.1 by Alexandru Csete, OZ9AEC. The hid part is taken from

Thanks to Michael Dickens, who gave valuable hints for implementing message in hier2_blocks.