MT-32 Hat and MiSTer output device issue (i2s/pwm)

[StiffPeakz]

I wonder if anyone can help, when I have my output device set to pwm in the mt-32.cfg everything works perfect, I get sound out of the Pi's audio output jack, the MiSTer logo splash screen pops up on the oled and the MT32-pi menu appears on the MiSTer's OSD.

The problem is when I set the output device to i2s, I don't get the splash screen or the OSD, sometimes I get sound but not always, could there be some sort of conflict in the settings, i2s seems to mess things up?

[dwhinham]

In all cases of similar issues, it's been due to the cable being too long or poor quality. When the I2S data begins to flow down the USB cable, the I2C signals in the adjacent wires are being distorted by capacitance/crosstalk in the cable and the data becomes corrupt.

~30cm is borderline, ~50cm very rarely works. Most people have had success with 15-20cm cables.

[StiffPeakz]

I got a pre built kit from retrobench, I did look at the pins closely but everything looks ok, the system works fine other than what I mentioned above

[flynnsbit]

I had the exact same issue and it was that, in case you wanted to give that a closer look so you can use it somewhere else.

[StiffPeakz]

It got the better of me so I decided to remove all the pins and solder new ones on myself and would you believe it, it works perfect now, it even fixed previous issue I had with the snac board so now I have a spare analog board 🤦‍♂️

Thanks for the suggestions I think you where right in that I had some sort of bridge but for the life of me couldn’t see it

[dwhinham]

Way to go! Well done 🙂

[StiffPeakz]

Oh and I forgot to say thanks for the awesome work you guys do 👍