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peterhinch / micropython-nano-gui

A lightweight MicroPython GUI library for display drivers based on framebuf class
MIT License
492 stars 87 forks source link

TTGO SPI #11

Closed IhorNehrutsa closed 3 years ago

IhorNehrutsa commented 3 years ago

https://github.com/peterhinch/micropython-nano-gui/blob/090509a4d9920369a0017f4647d480acf652c969/color_setup/st7789_ttgo.py#L73-L74

The screen is black if the baud rate grater than 33Mhz. Is it a hardware limit?

ssd._spi.deinit() is required at the end of demos examples.

peterhinch commented 3 years ago

I had varied experiences with baudrates above 30MHz. In one test it worked fine at 60MHz, but next time I tried the display was corrupted.

This is an electrical issue, as detailed in the docs. To run reliably at high frequencies you need a PCB with a groundplane and short interconnects. This is a normal issue of electronics design, and not a problem with the hardware or the driver.