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Free applications

Application list:

  • Scope
  • Scope+gen
  • Scope+pid
  • spectrum
  • freqanalyzer

Application structure

Scope, scope+gen, scope+pid have all similar structure

path contents
apps-free/Makefile Main Makefile used to build all applications listed here.
apps-free/app_name/index.html Main client GUI file. It is used for graphical view of the application in the web-browser
apps-free/app_name/Makefile Application Makefile, used to build src intro controller.so and controllerhf.so
apps-free/app_name/info Application meta-data in the application list of a red pitaya
apps-free/app_name/src Main source directory. Most of C code resides here.
apps-free/app_name/fpga.conf File containing the fpga.bit file location for each specific application.
apps-free/app_name/doc Documentation directory

Spectrum and Freqanalyzer

These applications have a slightly different structure in the src directory.

path contents
apps_name/src/external/kiss_fft Fast fourier transform directory; kiss distribution.

Build process

Before building the applications, you need or should set your working environment.

You need to set the CROSS_COMPILE variable. Check to see if is is already set by using the following command:

env | grep CROSS_COMPILE

The output should be something like: CROSS_COMPILE=arm-linux-gnueabihf-. If this gives you a blank result, you should either set the CROSS_COMPILE variable to be pointing at the gnu cross compiler or check our how to build red pitaya OS wiki-page

If you don't have gcc cross compiler installed, you can install it with the following command:

sudo wget https://releases.linaro.org/14.11/components/toolchain/binaries/arm-linux-gnueabihf/gcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf.tar.xz

Extract the content of this .tar.xz file you just downloaded

tar xvf gcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf.tar.xz

Now all you need to do, is set the PATH variable to include the linaro directory.

export PATH=$PATH:./gcc-linaro-4.9-2014.11-x86_64_arm-linux-gnueabihf/bin

NOTE: You can copy the extracted linaro directory where ever you want, but remember to set the PATH variable accordingly.

Now export the CROSS_COMPILE variable.

export CROSS_COMPILE=arm-linux-gnueabihf-

Once you did all that, you can use the same command as before, to check you completed these steps successfuly.

env | grep CROSS_COMPILE

which should now, in term, give you the desired output.

Now it's time to build our applications. You can run the Makefile from the apps-free directory building all the applications listed all at once. Or you can navigate to the specific application. Either way, the command remains the same:

make clean all

This way we are going to first clean some old artifacts, remaining from older builds and build a fresh, new copy.