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juj / fbcp-ili9341

A blazing fast display driver for SPI-based LCD displays for Raspberry Pi A, B, 2, 3, 4 and Zero
MIT License
1.6k stars 266 forks source link

SEPS525 supported? #147

Open toto99303 opened 4 years ago

toto99303 commented 4 years ago

Hello,

Is it possible to add support for SEPS525 display? I'm using this display in a VMU mod with Pi Zero, but the refresh rate is killing the experience...

Datasheet: http://www.newhavendisplay.com/app_notes/SEPS525.pdf

The mod: https://sudomod.com/forum/viewtopic.php?t=6917

I hope something could be done about this...

juj commented 4 years ago

The display does look like it could be supported within current driver design. I don't unfortunately have the display (or even if I did, unfortunately not able to spend time to work on adding support at the moment).

If someone has the display and is able to find a spec sheet or reverse engineer the bus, pull requests would be welcome!

toto99303 commented 4 years ago

As far as I read the bus is very well described in the attached datasheet? Unfortunately my programming skills are not enough to pull this off, that's why I asked here... Since the bus i documented I could try, but I would need some guidelines how to start.

juj commented 4 years ago

Oh right - indeed, the spec sheet documents the protocol. In general the porting process is as follows: 1) Write the initialization sequence for the display. E.g. ILI9341 has it here 2) Write the pixel cursor update sequence protocol, e.g. for ILI9341 here. 3) Write any needed display-specific color conversion e.g. here 4) Address any other display-specific aspects that the display is incompatible with against the existing driver (e.g. partial window sets, DMA, or something else)

toto99303 commented 4 years ago

Thanks for the fast answers! I'll try to find time to dig into this.