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displayio: Fix matrixportal crash#3507
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An RGBMatrix has no bus and no bus_free method. It is always possible to refresh the display. This was not a problem before, but the fix I suggested (adafruit#3449) added a call to core_bus_free when a FramebufferDisplay was being refreshed. This was not caught during testing. This is a band-aid fix and it brings to light a second problem in which a SharpDisplay + FrameBuffer will not have a 'bus' object, and yet does operate using a shared SPI bus. This kind of display will need a "bus-free" like function to be added, or it can have problems like adafruit#3309.
ladyada
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Oct 3, 2020
tyomitch
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Apr 30, 2021
These commented-out lines of code have been unused for a long time, so remove them to avoid confusion as to why they are there. mp_obj_dict_free() never existed, this line was converted from mp_map_deinit() and commented out as soon as it was added. The call to mp_map_deinit(mp_loaded_modules_map) was commented in 1a1d11f. Fixes issue adafruit#3507. Signed-off-by: Damien George <damien@micropython.org>
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An RGBMatrix has no bus and no bus_free method. It is always possible to refresh the display.
This was not a problem before, but the fix I suggested (#3449) added a call to core_bus_free when a FramebufferDisplay was being refreshed. This was not caught during testing.
This is a band-aid fix and it brings to light a second problem in which a SharpDisplay + FrameBuffer will not have a 'bus' object, and yet does operate using a shared SPI bus. This kind of display will need a "bus-free" like function to be added, or it can have problems like #3309.
Closes: #3506
Testing performed: Used the 1-line reproducer from #3506 on my matrixportal.