Upgrade LVGL to v9.2.0 #469
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alevy
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This was referenced Oct 18, 2024
LVGL 9 has a pretty significantly different API.
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This PR upgrades the LVGL library to version 9.2.0 and adjusts the example lvgl application accordingly.
This is mostly a straightforward port, though there is some cleanup of global variables etc to make the application example slightly more cannonical C using some of the better ergonomics of newer LVGL API.
Most significantly, this PR now elides the process-level conversion of the frame buffer from normal RGB565 to a swapped version for SPI and other busses that swap them (see: https://docs.lvgl.io/master/porting/display.html#swap-endianness). My argument is that including this at the process level is inappropriate and non-portable, instead individual drivers in the kernel should account for swapping bytes if needed.
This is currently not the case for at least the
st77xxdriver, but I have tock/tock#4206 address that.