micropython-nano-gui/drivers/ssd1351

Drivers for SSD1351

There are three versions.

• ssd1351.py This is optimised for STM (e.g. Pyboard) platforms.
• ssd1351_generic.py Cross-platform version.
• ssd1351_16bit.py Cross-platform. Uses 16 bit RGB565 color.

To conserve RAM the first two use 8 bit (rrrgggbb) color. This works well with the GUI if saturated colors are used to render text and controls.

The ssd1351_generic.py version includes the micropython.viper decorator. If your platform does not support this, comment it out and remove the type annotations. You may be able to use the micropython.native decorator.

If the platform supports the viper emitter performance should still be good: on a Pyboard V1 this driver perorms a refresh of a 128*128 color display in 47ms. The STM version is faster but not by a large margin: a refresh takes 41ms. 32ms of these figures is consumed by the data transfer over the SPI interface.

If the viper and native decorators are unsupported a screen redraw takes 272ms (on Pyboard 1.0) which is visibly slow.

The ssd1351_16bit version on a 128x128 display requires 32KiB for the frame buffer; this means it is only usable on platforms with plenty of RAM. Testing was done on a Pyboard D SF2W. With the GUI this version offers little benefit, but it delivers major advantages in applications such as rendering images.

This driver was tested on official Adafruit 1.5 and 1.27 inch displays, also a Chinese 1.5 inch unit.