OpenCL Demos for Xilinx FPGAs
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Xilinx Demos

Repository with ArrayFire demos for Xilinx FPGAs, showing its capabilities with OpenCL. Currently only a demo of the FAST feature detector is available.


  • SDAccel 2015.1 release 5 or newer
  • GCC 4.6.x or newer
  • CMake
  • Qt 4.6.x


Currently, the FAST demo contained here has been only tested with the Alpha Data ADM-PCIE-7V3 card, but it should work properly with any SDAccel supported cards.

For a different card, the following modifications (consult SDAccel's documentation for information on precise device names) may be necessary prior to the instructions that will follow:

  • Environment variable XCL_PLATFORM in file fast/
  • Target device in line starting with add_device in file fast/board_compile.tcl

The instructions that will follow assume that you are using bash, for other shell, please refer to its manual for the necessary changes.


  • Check that you have at least SDAccel 2015.1 release 5 installed and xdma kernel module properly compiled and installed.
  • Set the path to SDAccel installation directory (the default usually is /opt/Xilinx/SDAccel/<version>, where <version> should be changed to the version number installed, here we use 2015.1):
export XILINX_SDACCEL=/opt/Xilinx/SDAccel/2015.1
  • Compile the FPGA binaries (the image width is fixed to 640 pixels, if you need a different width, make sure to change the WIDTH macro in fast/ before proceeding). This may take more than one hour, depending on the CPU:
cd xilinx_demos/fast
sdaccel board_compile.tcl
  • Install the necessary kernel and runtime files to the bin directory:
  • Build the host application (if the system is CentOS 6.6 or other OS that does not have C++11 support, use the GCC compiler provided with SDAccel, otherwise ignore CMAKE_CXX_COMPILE and CMAKE_C_COMPILER flags):
cd ..
mkdir build && cd build
cmake -DCMAKE_CXX_COMPILER=${XILINX_SDACCEL}/lnx64/tools/gcc/bin/c++ -DCMAKE_C_COMPILER=${XILINX_SDACCEL}/lnx64/tools/gcc/bin/gcc -DOpenCL_INCLUDE_DIR=${XILINX_SDACCEL}/runtime/include/1_2 -DOpenCL_LIBRARY=${XILINX_SDACCEL}/runtime/lib/x86_64/ ..
make -j4


  • Verify that the environment variable XILINX_SDACCEL in bin/ is pointing to the SDAccel installation path.
  • Execute the GUI binary:
cd ../bin
  • In the interface click on Open Directory and select a directory containing the images to detect features on (all of them must be 640 pixels wide, or have the same width as chosen during the building step).
  • From the list select "FAST" (leave loop ticked if you want it to run continuously).
  • Press start.

Known bugs

A problem with the scheduler may cause rendering FPS to be too low. For a workaround, try increasing variable desiredFramerate in src/CAFWorker.cpp from 30 to 40 or 50.


  • Error: ./xilinx-demo: /usr/lib64/ version GLIBCXX_3.4.14 not found (required by ./xilinx-demo)

  • Possible cause: You don’t have from the compiler provided by Xilinx.

  • Solution: Check that you have the file bin/lnx64.o/ and that it is in your LD_LIBRARY_PATH, check that you ran in the fast/ directory, then check that you are in bin/ directory and that you ran source

  • Error:

Loading fast_pipeline.xclbin
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
unzip:  cannot find zipfile directory in one of /tmp/15013/tempFile_0 or
        /tmp/15013/, and cannot find /tmp/15013/tempFile_0.ZIP, period.
chmod: cannot access `/tmp/15013/sys_emulation_0': No such file or directory
sh: ./ No such file or directory
FATAL ERROR : Simulation process did not launch
libprotobuf ERROR google/protobuf/] Can't parse message of type "response_packet_info" because it is missing required fields: size
  • Possible cause 1: The xdma kernel module is not loaded.
  • Solution 1: Try loading the xdma kernel module.
  • Possible cause 2: Runtime files are not in the bin/ directory.
  • Solution 2: Verify that you installed the necessary kernel and runtime files (check building instructions)
  • Possible cause 3: The environment variables were not set.
  • Solution 3: When inside bin/, execute source