My PCB

[feiltom]

Hello, i work also on this project.
my design :
https://easyeda.com/feiltom/gvif
i order BOM now.
design for 24bit mode ( we need SFTCLK and DE For CXB1457R )

[Wh1terat]

@feiltom
Did you order and test the board ? How did it go?

[feiltom]

@Wh1terat It seem work:
https://www.amazon.fr/photos/share/WMHtlb4fM8g1kVDWF557k6Thw5CsBoGljEFuvYUkhMH
Timing Problem.
@joeri3000 find a problem on my design. i correct.

[Wh1terat]

What are you using on SFTCLK ?

[feiltom]

For this result i use :
dpi_output_format=491527
dpi_timings=800 0 40 48 88 480 0 13 3 32 0 0 0 60 0 32000000 6
32Mhz on SFTCLK ( GPIO0 - PCLOCK on pi)

[Wh1terat]

"<pixel_freq> = clock frequency (width x height x framerate)"

800x480x60 = 23040000

[feiltom]

i test many timing with black screen, only this one have some result. in CXB1457R datasheet
31.35MHz < Fsftclk < 34.65 MHz for WVGA

[Wh1terat]

That's true, it does specify that.
Pretty sure the PI will only be doing 31.25Mhz due to rounding.

Which Pi are you using?

[feiltom]

what car you have, i can send you a shield for test, i am not ok with lcd timing ;(

[Wh1terat]

Nissan GT-R (R35); it uses CXB pairs for GVIF too.

I must admit it's not my specialty either - but I do have a spare screen on my lab bench so could do some testing without having to be sat in the car!

Happy to pay whatever it owes you.
If interested I also have some Apple auth IC boards I made if you wanted to look into Carplay - could do a swap ?