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Should also hopefully fix the random behavior of the DIR pins. When I was testing a really slow timing, the steppers seemed to want to not go in the right direction. That was fixed with the critical section. The 1us delay might be overkill, but I'm not the one that added a 100nF capacitor on the LATCH line (basically chip select). This might be part of the randomness that happened and why some board behaved better than others (stronger GPIO outputs)
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README.md

Prusa-Firmware-MMU-Private

How to prepare build env and tools

As the first step extract the AVR-GCC to some dir, e.g. /home/user/AVRToolchainMMU/avr8-gnu-toolchain-5.4.0

Add /home/user/AVRToolchainMMU/avr8-gnu-toolchain-5.4.0/bin to your PATH.

mkdir .dependencies
cd .dependencies
mkdir gcc-avr-5.4.0
cd ..
utils/bootstrap.py

bootstrap.py will now download all the "missing" dependencies into the .dependencies folder:

  • clang-format-9.0.0-noext
  • cmake-3.15.5
  • ninja-1.9.0

Note: bootstrap.py will not try to download the AVR-GCC as there is already a directory called gcc-avr-5.4.0. This will be fixed when we find out where to download the correct packages reliably.

How to build the preliminary project so far:

Now the process is the same as in the Buddy Firmware:

utils/build.py

builds the firmware.hex in build/mmu_release

In case you'd like to build the project directly via cmake you can use an approach like this:

mkdir build
cd build
cmake .. -G Ninja -DCMAKE_TOOLCHAIN_FILE=../cmake/AnyAvrGcc.cmake
ninja

Should produce a firmware.hex file as well.