Avrdude for updating Prusa MK3 firmware. Note that you ONLY need this special avrdude variant if you want to flash Prusa MK3 firmware *AND additional languages*. If you want only English then stock avrdude is enough. Checkout, compile, rename to avrdude-prusa and tell OctoPrint-FirmwareUpdater to use it. NOTE: Needs OctoPrint-FirmwareUpdater with Prusa MK3 support (which isn't released nor merged yet) OctoPrint/OctoPrint-FirmwareUpdater#325 Differencies between this and stock avrdude: * special serial command is needed to make Prusa MK3 hardware ready for programming external flash * Prusa USB to serial converter is buggy and doesn't like ';' character to be transmitted. Workaround for that is needed. Changes taken from: https://github.com/prusa3d/PrusaSlicer/tree/master/src/avrdude Building: libtoolize --copy --force aclocal autoconf autoheader automake -a -c ./configure --prefix=/usr --sysconfdir=/etc make mv avrdude avrdude-prusa ================================================ See the documentation file for the details. The latest version of AVRDUDE is always available here: http://savannah.nongnu.org/projects/avrdude Important environment variables for ./configure: ================================================ CPPFLAGS: C preprocessor flags (*not* "C++") This is the place to put additional (non-standard) -I options into. For example, if your Windows system has LibUSB-Win32 installed into \\WINDOWS\ProgramFiles\LibUSB-Win32, use CPPFLAGS=-I/WINDOWS/ProgramFiles/LibUSB-Win32/include to tell configure where to search for the header files. (The use of forward slashes rather than backslashes can often simplify things. Note that the Windows system services internally treat both the same. It's only cmd.exe which requires backslashes as the directory separator.) LDFLAGS: Linker options This is the place to make additional library locations known to the linker. To continue the above example, use LDFLAGS=-L/WINDOWS/ProgramFiles/LibUSB-Win32/lib/gcc to make the linker search for "libusb.a" in that directory. Linux users: make sure the header files are installed ===================================================== While many Linux distributions install the libraries needed by AVRDUDE (libusb, libelf) by default, they leave out the corresponding header files. Consequently, the configure script won't find them, so these libraries could not be used. Usually, the packages with the header files (and static libraries) are derived from the regular package name by appending "-devel". Thus, make sure you have "libusb-devel" and "libelf-devel" installed before running the configure script. (Same goes for libftdi.)