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I am following a DIY guide that requires me to patch two arduino core library files: HID.cpp and USBAPI.h. This is not really practical for many reasons. I am not a native C programmer, but I am sure there are better ways to achieve the same without messing directly with system files. How can I override system library files without modifying the originals?

  • That all depends on what the modifications are you need to do... – Majenko Nov 4 '15 at 18:05
  • @Majenko principally it adds a third device description (HID Remote) to the two devices that are described in those two files (Keyboard and Mouse). I can upload a diff. – retrography Nov 4 '15 at 18:30
  • Can't you just place a copy in the sketches folder and alter this local copy? – Gerben Nov 4 '15 at 19:03
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Unfortunately there really isn't any way of doing that other than modifying those files. The good news is that it is perfectly viable to make the modifications under a different "core" and then amend boards.txt with the core containing the modifications.

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