Best posts made by aTg

After working with @ironic on the RGB-Pi project for Recalbox now I'm starting a bigger challenge, to create a jamma adapter for RPi fully integrated with amplified sound, buttons, rgb and power all through the gpio without any additional cable.

I have some progress made, for the video we use mode 3 of the DPI output of the Pi, this leaves us free the outputs GPIO9, 10 and 11 where we will connect two MCP23S17 with which we will introduce the buttons, a pin is needed for the CE Or CS (ChipSelect) at the moment use pin 8 that currently belongs to a bit of the RGB blue channel, later we must move this CS to another pin, it is the only pin with the ability to move and this is the only combination of hardware to do everything through the GPIO and I have been studying it for a long time.

This is the prototype:

Here a little video:
https://www.youtube.com/watch?v=FzMKjC5MNCc

To control the MCP23S17 by the SPI port I am using a ControlBlock2 drivers that are open source, but they are compiled in Raspbian, I need the way to integrate them into Recalbox or control the MCP23S17 by different way, at this point I need a Little collaboration from the Recalbox Devs.

Hello, I come to this forum because in other sites I have had many critics saying that I have not discovered anything new or that it was better to use an HDMI > VGA converter.

The first thank you for the interest and the valuation on your part, I have seen that all the questions you have are really interesting and I will try to answer them, sorry for the English I am using translator.

I am using RetroPie only for development since Recalbox is a buildroot and and it's harder to do tests but the idea once finished is to launch a patch or if the developers collaborate a specific version of Recalbox.

The first photo of the prototype is not the complete circuit. I have done this so that it would not be so simple to clone.

If I am thinking of selling it but for those who like to solder I thought of selling only the PCB so that each one builds his own cable at a much lower price and easier to do the circuit from scratch.(If you are patients in a little more than a week I will have the first PCBs)

The idea is that this is mounted inside the SCART housing

I also have the change of resolution for each emulator, there is the section of mame that needs another more complex system but that we can develop it with time, to see if the developers of recalbox help a little, they will get a cable so that it Try them out.

https://www.youtube.com/watch?v=KIVKS6rr4LQ

I have finished assembling the prototype and it works very well, I reduced the noise in the image, for the production version I will change the size of the components to a larger one but basically everything is fine.

I have uploaded a small script that I have done to check all bits of the RGB output separately and also the two audio outputs by the GPIO 18 and 19, this test is also valid for vga666 or other devices that use mode 6 of the DPI.

It is necessary to have raspi-gpio, fbi and alsa.

rgbpi-test.zip

You are complicating life with the HDMI converter, I have already finished 10 cables if you want some. With the cable there is no problem with the hdmi_timings

I have opened a web where I will have updated the latest version of Recalbox for CRT made by me, there are also available cables already assembled ready to use.

rgb-pi.com

As says @Substring still we have a lot of work to make all games to work in their original resolutions but for now there is a lot that can already be enjoyed.