#HOW TO SET UP RETROPIE FOR CRT DRIVER#
#HOW TO SET UP RETROPIE FOR CRT 240P#

With vc4-kms-v3d, the Linux kernel is driving all that lot, and DRM prohibits multiple clients adding layers at the same time. With vc4-fkms-v3d this remains with the firmware, and the firmware still allows DispmanX or MMAL to add extra layers. It's down to what actually drives the video scaler (HVS), pixel valves, and output display blocks (HDMI/VEC/DSI/DPI). KMS does all that by accessing the HW registers directly from ARM space, bypassing the firmware completely.

#HOW TO SET UP RETROPIE FOR CRT DRIVER#

The following gives a good description of the different driver models:įKMS (fake) uses the dispmanx and mailbox API's to talk to the firmware for things like the composition and video output stages.

The TV output is controlled by the VEC DAC (encoder generating the analog PAL or NTSC composite signal), but the VEC is not accessible with the fake/firmware vc4-fkms-v3d driver and my understanding is the vc4-kms-v3d-pi4 which would allow direct hardware access is still experimental. You will essentially resize the framebuffer, but the output will remain the same. Installing X11 and adding ModeLines using xrandr also won't work.

#HOW TO SET UP RETROPIE FOR CRT 240P#

Mode switching between 480i and 240p via DRM/KMS is currently not possible. You can boot directly into 240p by setting sdtv_mode=16/18 for NTSC/PAL. You may want to check out the configs in that repo as some platforms need additional tuning. Try one of them as the only shader pass first. In my experience Sakitoshi's tvout_smart and tvout_sharp shaders ( ) do a great job of improving things quite a bit, but just make sure you Shader #X Filter to Linear. Try playing your favorite ROMs first, and you will probably notice that the interlace shake is rather annoying, and there may be other issues. I recommend you keep it that way as a boot default and Emulationstation. Now using sdtv_mode=0/2 you will be in 480i. If you don't see the rainbow screen on your display, try power cycling. I believe the following cable is also wired correctly: This is the cable I used and can verify that it works and has the correct wiring:

So for example if PIN1 on the 3.5mm jack is wired to the white or red RCA connector it will still work as video, you just plug that into the TV Composite port instead of the yellow connector. The wiring of the other pins doesn't matter. There are many similar cables out there bundled with various A/V equipment, however most of them have ground on PIN1 and won't work, but the cable we need must have composite video on PIN1. You will need a correct 4-pole 3.5mm to A/V RCA cable.

How to set up retropie for crt