is possible use an Adafruit DAC?

[dwhinham]

is possible use an Adafruit DAC?

[dwhinham]

Hi there! 😃

Don't worry about i2cdetect not finding anything - this DAC is not controlled by software and so we can ignore the I2C side.
It should be enough to set output_device = i2s in the config, and ignore the i2c_dac_xxx options.

Let me know if it works and we can add your DAC to the compatibility list!

You can test by playing MIDI notes on channel 2 or above, or by hooking it up to a PC running ScummVM - you should see the Pi's activity LED blinking when it's receiving data.

[yavimaya]

Hey there, just wondering if you'd managed to get your DAC working? 😃

If so we can close the issue. Thanks!

I CONFIRM it works perfect with both ES9018K2M and UDA1334 dacs :D

[dwhinham]

Hey there, just wondering if you'd managed to get your DAC working? 😃

If so we can close the issue. Thanks!

[DSkywalk]

Sorry, my first idea was to directly use a serial port of an FPGA (MiSTer), but we still don't have the correct rate configuration. Anyway, some sound should come out, because if I use PWM, random sounds are heard. So I thought about building the whole circuit to have better tests, but I still have to get the parts.

If you want we could close this issue, although as I say I haven't been able to hear anything with the I2S connected 😞

PS: Could I make an initial sound plays at the beginning?

[dwhinham]

No need to close the issue, just checking in! 😃

Yeah, those logs are showing garbage MIDI data and Active Sense is getting confused.
A valid note-on should look like 91 0C 7F.

What's the baud rate of the MiSTer? mt32-pi's serial baud rate is set to standard MIDI 31250bps here:

mt32-pi/src/kernel.cpp

Line 100 in 0147c2c

if (!mSerial.Initialize(mSerialMIDIEnabled ? 31250 : 115200))

You could try 115200 or some other rate to match the hardware - if it works, I'll create a config option.

Your DAC should definitely work as I'm using another board with UDA1334A and it works great as long as I set the config to use i2s!

I do have some code somewhere that I used to self-play a test pattern for my friend who had no MIDI but wanted to check his DAC. I'll see if I can find it!

Which model Pi, by the way?

[dwhinham]

Just going to go ahead and close this as the original question has been answered. Thanks!