Odroid-GO

[Paula Silva]

Hello all, and since this is my first post here, let me introduce myself: My name is Paula Silva, I'm an electronics engineer, R&D and trainer, and I took some time of my own to create an Odroid-GO, as in these pictures. The big issue with this is that I´m not much of a programmer, and sometimes at boot the screen flips. Don't care now about the "games", but wish that everytime I boot the Odroid-GO it has the screen correctly oriented, has anyone came up with this, and is there a solution (I believe that there is)?

Thanks in advance.

-= Paula Silva =-

[mctom]

Hi!

There's no reason for the firmware to act differently on each run.
I'd check your Display's DC ("Data/Command") connection.

[mad_ady]

What ESP model do you have and which software version are you running?
If you haven't touched the code, most likely the issue is caused by the connection of the screen - probably some of the initialization commands get corrupted and the screen fails to rotate. Maybe you don't see glitches in the image begause it gets redrawn often, but the initialization code gets sent only once and is more prone to corruption/crossover. Since the screen operates at 40MHz (if I remember correctly), wire length/position matters when it comes to signal integrity.

So, maybe try shorter wires for the screen?

[mctom]

Right, that too. It's 26.67MHz, according to the code. Certainly too much for a breadboard, unless proven otherwise.

[odroid]

Moved from XU4 sub-forum.

[Paula Silva]

What ESP model do you have and which software version are you running?
If you haven't touched the code, most likely the issue is caused by the connection of the screen - probably some of the initialization commands get corrupted and the screen fails to rotate. Maybe you don't see glitches in the image begause it gets redrawn often, but the initialization code gets sent only once and is more prone to corruption/crossover. Since the screen operates at 40MHz (if I remember correctly), wire length/position matters when it comes to signal integrity.

So, maybe try shorter wires for the screen?

I'm using the WROOM-32UE, and the SVN is the 20181001 (ba31df7503). Anyway I've "fixed" the display problem, was indeed the long wires. Thanks for all your help!