Does Anyone got these two working together? the FYSETC 12864 is not a drop in replacement for the factory Ender 3 LCD. Where is the pin diagram from EXP1 on the Cheetah boards?
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Have a look on how the BIGTREE SKR mini supports the the FYSECT mini. https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.0.x/Marlin/src/pins/stm32/pins_BIGTREE_SKR_MINI_V1_1.h
You guys should at least add something similar so your boards support your hardware (LCDs), with a simple uncommented line on configuration.h
I am very sorry to bring you trouble! I have updated the schematic to github and you can check it out! hope this helps! In addition, in order to support 2208, Cheetah uses more I/O, only one EXP, so it does not support mini12864.