Hardware SPI for OLED Screen

[dolfelt]

Has anyone here investigated using hardware SPI to perhaps speed up the LCD screen? I've managed to upgrade the LED software to the u8g2 library, which helps a bit, but not much on the performance. Hardware SPI could probably improve that greatly.

The other thing I'm looking into is using the U8x8 character mode that can theoretically greatly improve performance as well, though it doesn't appear to be able to draw anything other than text. https://github.com/olikraus/u8g2/wiki/setup_tutorial#u8x8-character-mode

Any thoughts or help would be greatly appreciated!

[cap9qd]

I know I am dredging up the past but here is something to test: https://github.com/cap9qd/FreeExpression The project is configured for the Expression (MACHINE_EXPRESSION is defined) and if you want to swap back then remove USE_U8G2 from symbols.

Best I could tell the SPI for the OLED is not on the hardware USART/SPI bus (PortF) but using u8g2 is much much much faster; I didnt try anything except char-mode.