This repo should contain everything to compile micropython for the ttgo camera plus board.
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The cam driver comes from lemariva: https://github.com/lemariva/micropython-camera-driver
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ST7789 display driver is from Ross Hughes: https://github.com/russhughes/st7789_mpy
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Micropython version is 1.18, esp-idf version is 4.2
It really is pretty simple:
git checkout --recursive https://github.com/pianojockl/ttgo-camera-plus-micropython
cd ttgo-camera-plus-micropython
./do-everything.sh
Good luck!