Testing / porting plans?

[znmeb]

I have a few RP2350 boards I can test USB audio on. I have a Pimoroni Pico Plus 2 and Plus 2 W, a SparkFun Pro Micro RP2350, an Adafruit Feather RP2350 with HSTX, and the two iLabs Challenger+ RP2350 boards.

I'll probably test on the Feather first. Is there a test / example sketch I can use?

[pschatzmann]

Delete the Adafruit_TinyUSB_Arduino folder in the packages/rp3040/4.0.3/libraries. Please note that ths is different than the regular libraries directoy into which you install libraries normally. TinyUSB is part of the core and must be replaced there.
In my linux this is e.g.

sudo rm -r ~/.arduino15/packages/rp2040/hardware/rp2040/4.1.1/libraries/Adafruit_TinyUSB_Arduino
cd ~/.arduino15/packages/rp2040/hardware/rp2040/4.1.1/libraries

In the libraries directory of the arduino packages execut the following commands

git clone https://github.com/pschatzmann/Adafruit_TinyUSB_Arduino
cd Adafruit_TinyUSB_Arduino
git switch Audio

The Audio microphone examples should work!
You can easily extend the existing tests with the functionality from the AudioTools,

You get back to the original main branch with

git switch master

ps. So far I have enabled this only for the RP2040 Architecture: this should conver the RP2350 as well.

[znmeb]

OK - sounds good. I've tested the 4.0.x and 4.1.1 arduino-pico core with a few RP2350 boards from PlatformIO with no problems on the Arduino side, and the Arduino RP2040 USB serial test sketches work on RP2350 boards so I'm guessing this will work.

[pschatzmann]

Not sure what PlatformIO will do here: just make sure that you specify the correct branch.
I was testing with Arduino recording audio with Audacity on my Linux Laptop

[pschatzmann]

The speaker example is working now as well and the issues for the non working cdc Serial output has been corrected

[znmeb]

Good to hear. I'm rebuilding my development container so I can pull in the new GitHub repo.

[pschatzmann]

Do you have any news ?

From my side: I finally managed to have the Headset scenario working together with CDC as well. It took me quite some time to figure out that the default desciptor buffer was too small and that I needed to define my own buffer.

Today I did a quick test with a Seeeduino Xiao: and there it is working w/o problems as well...

[znmeb]

First test: I had a few missing pieces, most notably figuring out how to tell arduino-cli which USB stack to use, but I've got the test setup working. For the record, you tack it onto the end of the FQBN - rp2040:rp2040:adafruit_feather_rp2350_hstx:usbstack=tinyusb

I went straight for the audio_microphone_stream example since it's closest to my eventual use case - a synthesizer that plugs into a USB port. The compiler was not happy ... see attached logfile.

I'm going to try the one without the sawtooth - audio_microphone - to see if I can get a clean compile, upload and white noise coming into the laptop. I'm currently using an Adafruit Feather RP2350 HSTX as a test board but I have other boards with attached I2S audio adapters or Bluetooth that I could use to test Arduino Audio Tools.

audio_microphone_stream.zip

[pschatzmann]

I committed the SawToothGenerator today, so you might need to upgrade the AudioTools, or replace SawToothGenerator with a SineWaveGenerator whch should exist in your installed version.

[znmeb]

Ah ... turns out I was installing from the release tag rather than from the main branch! It records and plays back in Audacity now.

[znmeb]

Good news - audio_microphone is working! It compiles, uploads, writes its log to the serial port, shows up as a microphone in Audacity and is clearly delivering white noise to the recorded track.

[znmeb]

I also have some boards supported by espressif/arduino-esp32. Is there any easy way I can test with one of them?

[pschatzmann]

I did some testing myself and did not manage to get it working and it would need to be a S2 or S3
I think I need to build my custom Arduino core to make this work there.

It is working well on all the Arduino cores that have the USB selection in the Arduino Tools menu.

[znmeb]

Ah, OK. I have an M5Stack Cardputer (ESP32-S3) and an ESP32-C6 DevKit C-1. But I'm in no hurry for it, unless you have boards to test on yourself.

[pschatzmann]

Cool, that increases the list of tested working microcontrollers to

• RP2040
• RP2350
• SAMD21 (Seeeduino XIAO)

So the next challang would be to get to grips with the ESP32 Library Builder or maybe use Arduino as a Component

[znmeb]

I also have a Teensy 4.1. It has its own extensive audio library and I think it has USB audio, but nothing like the Synthesis Tool Kit.

But the really interesting one is the M5Stack Cardputer. It has a tiny speaker, a microphone, WiFi and Bluetooth, a tiny display, an infrared transmitter and an SD card slot!