Recalbox RGB/Scart Output kein Bild

[funkybunch]

Aktuell habe ich wieder die original stable 4.0.1 drauf.

Leider hilft mir das Wiki wenig weiter, weil mehr auf HDMI eingegangen wird. Ich nutze aktuell einen Adapter, für einen RGB Output über den GPIO, damit ich wirklich möglichst alles an Bildqualität rausholen kann. Benötige ein 15khz Signal (240p)

[lackyluuk]

@funkybunch okay, lass uns mal @Substring fragen

@Substring He uses a "RGB output" connnected to GPIO (see link in first post) Does this work somehow in recalbox?

[funkybunch]

Das ist übrigens das Interfaceboard für den Scartanschluss.
https://www.pictastar.com/view/1488285698025119501

Und hier die genauen Infos.
http://strike-devices.net/index.php/pi2scart/

[funkybunch]

@lackyluuk Sorry, dass ich jedes mal @ nickname vergesse.

[Substring]

@lackyluuk rgb out connected to gpio ??? You mean the DPI interface ?

[funkybunch]

@Substring Hi. I tried diffferent options last night. But with the Recalbox image i get no picture (i only hear sound after booting). With retropie or other distributions it works. the same settings in Recalbox won't. So i copied the settings from RGB-Pi (which works also) and copied it to my boot partition. but i get the same problem. i've commented the force hdmi output and tried to set to zero, but without success.
I can not even see the noobs screen

[ian57]

@substring : Smallcab will perhaps lend me a Pi2scart module to make the support for recalbox. When arrived I will make some tests and write a mini howto for this module.

[Substring]

@funkybunch please paste your config.txt. I guess it's an overlay problem

[funkybunch]

@Substring i made the additional entry's from my starting post at the end of the config text on boot partition. disable "force hdmi" did not help.
I can post my complete config tonight.

[Substring]

@funkybunch I'm pretty sure it's an overlay problem. Does the vga666.dtb(o) exist in /boot/overlays ?

[funkybunch]

@Substring Yes, the vga666.dtbo exists

[funkybunch]

@Substring

So this is my full config.txt

#uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

#disable_overscan=1

#uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

#comment to get jack audio
#hdmi_drive=2

#config_hdmi_boost=0

#force hdmi while the tv can take time before sending the signal on the hdmi output
#hdmi_force_hotplug=1

#uncomment for composite PAL
#sdtv_mode=2

#uncomment for lirc-rpi
#dtoverlay=lirc-rpi

#if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or give a low resolution because tv had no enough time to initialize it
boot_delay=3

#uncomment if you don't want the rainbow at startup
disable_splash=1

#Overclock
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512

avoid_safe_mode=1

kernel=zImage

disable_audio_dither=1
dtparam=audio=on
dtoverlay=vga666
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
hdmi_timings=320 1 16 30 34 240 1 2 3 22 0 0 0 60 0 6400000 1 #240p

[Substring]

@funkybunch I've already been told about the dpi24 overlay not working with recalboxfs ... I guess this could just be because of our "old" kernel, but can't tell for sure

But remove the #240p from your hdmi_timings line. Also just try usual CEA/DMT mode that should fit your monitor (but write dpi_mode and dpi_group instead of hdmi_mode and hdmi_group)

[funkybunch]

@ian57 said in Recalbox RGB/Scart Output kein Bild:

@substring : Smallcab will perhaps lend me a Pi2scart module to make the support for recalbox. When arrived I will make some tests and write a mini howto for this module.

I look forward to hearing from you soon

[Substring]

@funkybunch have you read my answer ?

[funkybunch]

@Substring said in Recalbox RGB/Scart Output kein Bild:

@funkybunch have you read my answer ?

Yes i'm pretty shure i tried this way yesterday without success but i'll try it later again.

[funkybunch]

@Substring now i made the update to 4.1 unstable before i change the settings for using with a CRT. Now it Works! i have to set the overscan correctly, but that's not a big deal. When i finished, i can post the final config.txt

[Substring]

@funkybunch i'm not sure overscan will have the desired effect (something i must try), but porchs should do it

[funkybunch]

@Substring i thinks that is the best solution. Do you know a source which explains all parameter of hdmi_timings?

[Substring]

@funkybunch there is definitely none. It's all try'n'die. You'll just find the meaning of eachvalue, but their influence is very hard to explain.

What I can tell you is that playing on porchs moves the picture.

• if you want to move the screen to the left, increase the horizontal porch by one and decrease the back porch by one
• you can of course change this to move to the right
• playing on vertical porch moves the picture up and down.

Having a perfect full screen picture is almost impossible. Anyway that's siomething we're working on, but the result should come after 4.1 stable