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Well, to get a basic config and axes moving, I would suggest running the pncconf wizard. (though I don't know for sure if that supports the 7C80)

Even if it doesn't you can choose a different board and at least get the required config files set up in the folder structure, even if the details of the board name are not 100% correct.

You might find some useful ideas here; forum.linuxcnc.org/30-cnc-machines/42100...up-questions?start=0
I wrote (most of) a special purpose system without any G-code for a press brake.

GladeVCP and Python is probably the well trodden path, but QT and C++ is certainly possible.

And you will need C for any realtime parts such as custom HAL components.

This suggests that something (like a remap) is calling a bit of G-code with the letter E in it.
Or possibly there is something in your actual G-code file that is making it see an E as a command?