Is there a way to determine if display is connected?

[ntfs1984]

Doing some high-voltage device, which sometimes put display down, on ESP32 connection using SPI.
ESP32 doesn't rebooting, so it's only display problem.

Not problem of your library, but have a question: is there a way to determine if display still accessible via SPI connection?

[lexus2k]

Hi.
It is very display specific, and it depends completely on manufacturer ideas. Many displays do not support reading at all, while others have some custom support. The library uses 3wire spi. Very few displays support reading over 3wire spi.
4wire spi supports reading, but is also not widely used. Mostly i2c is the easiest bus to implement readings to understand if display is still there or not.

But where is a protection for low level voltage logic in your pcb?

Regards,
Aleksei