Need help to drive an lcd RGB 24 bits screen

dave-at-axon · April 23, 2015, 04:56:29 PM

I saw your request for design. I can do that but I need to understand what you have now.

Can you show me some pictures of how you have this connected. You can email me at the email I will send via PM.

After I see what you have tried, I will offer you an option based on designing you a PCB with the correct interface.

pawnies20 · April 25, 2015, 01:54:14 AM

Many thanx

pawnies20 · May 31, 2015, 04:43:31 PM

Hi dave!
Finally i bought a new lcd.
I was right, the 2 first screens uses ic hx8238d
They nedd an initialization with spi.
I bought a hx8238a and then it's ok.
The screen starts, become black ans when startx start, it changes of grey.

Problem: nothing appear on screen.
I can see changes on grey..
But nothing else.

can you tell me how you have wired your screens ? Did you have a plan, a map..

dave-at-axon · June 02, 2015, 05:32:29 PM

Hi,

Sorry for the delay as I was overseas.

I just connected the RGB, SYNC, DE and CLK lines as per similar to the Olimex LCD although only 16 bit. Lower unused bits were grounded.

What is your new LCD datasheet and how have you connected it to the A20?

Have you configured the LCD settings on the FEX correctly and sure that they are being read?

pawnies20 · June 09, 2015, 05:01:47 PM

Thanx Dave.
Yes, i have connected all pins as you have make.

I can see linux desktop but only on the quarter left of my lcd.

when i disconnect vsync and hsync, nothing happen...

Very strange, my fex seems good !!
I'm using these:
https://github.com/LeMaker/fex_configuration/blob/master/fex/banana_pi_35lcd.fex

My screen is these:
http://www.newhavendisplay.com/nhd35320240mfatxlctp1-p-5204.html

Thanx

dave-at-axon · June 09, 2015, 05:35:42 PM

Are you running Linux or Android?

It still sounds like a configuration issue in the OS if the screen only shows part of the GUI.

Can you show a picture of what it looks like?

You would probably benefit from the 5" at 800x480 as this works well with Linux and Android.

pawnies20 · June 12, 2015, 12:33:00 AM

Dave, i'm using linux debian

I'm using A10 lime board.

What is models you use ?

https://www.olimex.com/forum/index.php?topic=4517.0

dave-at-axon · June 12, 2015, 02:27:48 AM

A20-OLinuXino-MICRO-4GB