Not enough DMA-able memory to allocate display buffer

[amirgon]

@Tiago_Almeida

Yes I am using the pure micropython driver. I have it configured for single buffer mode.

One more thing you can do is change the factor parameter to 8 or to 16.
This parameter controls what factor of the screen is buffered, so larger number means smaller buffer (and possibly lower performance).

@Tiago_Almeida

So I guess is not a memory problem.

Actually, even if there is enough memory, there might not be enough DMA-able RAM.
Not all RAM is DMa-able on ESP32, only about 328KB.

This DMA-able RAM is probably consumed by the WiFi driver.

Here are some things you can try:

• Try to initialize the ili9341 driver before importing and using WiFi, so it would be the first one to allocate DMA-able RAM. WiFi will have less, but perhaps enough RAM.
• Change WiFi RAM allocation configuration. There are probably some H files or other configuration files that control this (that would probably require rebuilding the firmware).

You can check how much DMA-able RAM you have with the heap_caps_print_heap_info function. I think it’s available on espidf module so you can call it from a Micropython script or REPL.