[SpiROSE] Continuous integration and the FPGA story

This week, we put a conscientious effort in making the project eventually start its journey in a more peaceful way. We were quite pressured by the choice of the FPGA and SBC as it was impeding the rest of the project and its existence. Now it has been fixed, we can really start to think about the next tasks: developing software and tests.

Even if it is still not perfect, we spent some time in configuring the continuous integration, designing the different steps for each piece of our software. As I spent most of the week doing code review (and FH work about happiness at work, which made me happy about ROSE), I highlighted some points where it failed, like some commits accepted by the tests although some files were missing, or incorrect style not failing the CI, or that the file organization in some subprojects weren’t practical for the integration of tests.

Two things are still missing. On the first hand, we have to save the artifacts so as to show demo easily, but we need more code so that it is useful and easy-to-follow manuals about how to use these artifact (flashing, running configuration, etc.) We expect to have this quickly for the LCD screen and renderer demos. On the other hand, we still don’t have very precise tests on our software, but things are to change quickly as we are writing simulation code in SystemC for the FPGA.

The idea, given by our teachers, is to use Verilator, a SystemVerilog-to-C++-library compiler, to put our FPGA controller into an environment with a simulated SBC input and simulated drivers so as to produce an output image. We will be able to cross-check the protocol used by the drivers in poker mode and check timing constraints. The SBC will generate sample image in the future and we will be able to check that it is correctly rendered by the FPGA.

To use Verilator, we have to:

  • compile each .sv file into a library (or only source/header files)
  • create a top file in SystemC which integrates each piece that we connect to the FPGA
  • monitor the input and output of the FPGA through SystemC stub modules

Eventually, we have to find a way to do the same on the real FPGA so as to have host integration tests.

We received the LED and the driver on Friday, so we didn’t try another experiment of the POV effect, but it will come quickly this week.

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