uP Library - Display

[bartcerneels]

As a badge hacker I want to use the display using high level framebuffer MicroPython code

[bartcerneels]

Driver got enhanced for newline.gent's TTGO-T-Display. It's also ST7789 LCD. So might work for us.

https://github.com/badgeteam/ESP32-platform-firmware/commit/6a6d35d876f7db59ad4bb5606a543c3a219d2239

[bartcerneels]

It's confirmed, the current display only supports 9-bit/3-wire mode. There is no D/C signal.

The existing ST7789V driver only works with 4-wire/8-bit. We should change the display or hack the driver.

Driver hack:

• ESP32 SPI master does not support data transfers in 9-bit mode. We'd have to encode the DC bit into the data ourselves.
• There might be a performance penalty. In any case we can't DMA directly out of the framebuffer. An intermediate mem is required.

The curent display does support double data mode, using 2 wires to transfer data. This could be an advantage and performance gain, if the 9-bit overhead is not to much.