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Marlin on Lerdge K...and S?

A project log for Lerdge 3d Printer Mainboard Hacking

Breaking the encryption on the Lerdge series mainboards so I can try porting Marlin 2.0 to it.

jc-nelsonJ.C. Nelson 06/19/2020 at 00:350 Comments

I managed to unbrick my Lerdge K board (the bootloader dump sketch left it in a "SWD no longer works" state), and reset it with the K bootloader I have uploaded here, so the files are definitely good. I've also generalized the marlin build environment for Lerdge so adding support for K can be done with minimal fuss, but it will be at least a week before I have more hacking time.

A user contacted me who had a Lerdge S board, and flashed a build of Marlin for the X on it. It turns out the information I was given, that the pins were similar to the X, is not accurate, but that user is hacking away on the pins definitions, so S support will eventually be a thing.

The Lerdge S LCD reports itself as an 0x800C LCD...which is nothing.

But, it's definitely an ST7796. Forcing the override allows Marlin with LCD to boot on the S.

So that is definitely progress. Happy hacking, folks. See you in a week.

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