search

dwhinham / mt32-pi

🎹🎶 A baremetal kernel that turns your Raspberry Pi 3 or later into a Roland MT-32 emulator and SoundFont synthesizer based on Circle, Munt, and FluidSynth.
https://twitter.com/d0pefish
GNU General Public License v3.0
1.28k stars 81 forks source link

is possible use an Adafruit DAC? #14

Closed DSkywalk closed 4 years ago

DSkywalk commented 4 years ago

Hello! Is it possible to use my Adafruit UDA1334A in this project? How should I set it up?

I try to configure using i2cdetect and I dont get anything... imagen

Documentation for raspbian: https://learn.adafruit.com/adafruit-i2s-stereo-decoder-uda1334a/raspberry-pi-usage

My settings on volumio: imagen

I'd love to try this project at home. Thank you very much.

dwhinham commented 4 years ago

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.

dwhinham commented 4 years ago

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

If so we can close the issue. Thanks!

DSkywalk commented 4 years ago

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.

imagen imagen

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

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

dwhinham commented 4 years ago

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: https://github.com/dwhinham/mt32-pi/blob/0147c2c61e907e59f2ca8431cc9da533e98e2584/src/kernel.cpp#L100 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?

yavimaya commented 4 years ago

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 commented 4 years ago

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