Support for the TLV320DAC3100

[jwktje]

Problem Description

What would it take to get support for the TLV320DAC3100?
I'd be willing to have a crack at writing support myself. But I've never really written a driver before.
Adafruit does have a repo themselves for Arduino that shows a bunch of the setup code for the IC.
https://github.com/adafruit/Adafruit_TLV320_I2S

I don't know if that means it's easier to get up and running with arduino-audio-tools, or if a custom driver would still be needed.

Device Description

https://www.adafruit.com/product/6309

Sketch

Not relevant yet

Other Steps to Reproduce

No response

What is your development environment (with Arduino Core Version information)

No response

I have checked existing issues, discussions and online documentation

• I confirm I have checked existing issues, discussions and online documentation

[pschatzmann]

I suggest that you start with the library from Adafruit and if you have a good understaning of it and some spare time, you can consider to extend the functionality of this library....

[jwktje]

Great. And do you have some pointers on how you'd like a PR for a new DAC driver should be structured?
It looks like in Driver.h you call the specific functions for a DAC based on the general interface defined.

So I guess I should add the specific driver code and then implement the interface functions in Driver.h, in which I would call the DAC specific functions to get the chip initialized correctly. And then after that it should just run right upon receiving I2S data.

Is that how I should understand it?

[jwktje]

I managed to make the DAC produce audio by using the Adafruit library to init the chip over I2C and then use the I2SStream class.

Would there still be a benefit to porting over the logic to this repo? Because if so, I would probably still prefer this over having the Adafruit dependency (along with Adafruit_BusIO as a child dependency).

[pschatzmann]

I added a new Chapter to the Wiki!

[jwktje]

Thanks for the Wiki chapter. I really gave it my all to take a crack at this. But I feel like I'm a little out of my league, writing a driver.
My attempt is here

I read the datasheet through and studied the Adafruit library. But no matter how much I fiddle with the code, I can't seem to get it right. It produces sounds, but it clips a lot. Also my setVolume implementation doesn't seem to work right.

I guess I simply don't know enough about correctly initializing a DAC, and writing to registers in paged memory.
If anyone reads this, I would love to have a collaborator on this, or put up a "bug bounty" for this.

I followed the Chapter on the wiki so the scaffolding for the driver is in place. And it does function with Arduino Audio Tools, and my test sketch is included in my commit.

What's missing is:

• The expertise to get the init sequence fully right. Because now the gain is not sounding right to me. It clips
• A working setVolume call that sets the headphone and speaker volume correctly from 0-100
• Working headphone detection. I had hopes of making it switch to headphones the moment a pair are plugged in. My current sketch just outputs blown out audio on both

I'm a bit sad I didn't manage it myself, but if anyone can help me out I would really appreciate it.