Multi CDC with your Audio branch does not work

[nickoe]

Hello @pschatzmann

Thank you very much for sharing your work. I am very interested in your USB UAC2 audio work this, so I tried it out on a normal raspberry pi pico2 board with an RP2350. Your examples works fine, but there appears to be a regression in our branch in comparison to the upstream adafruit tinyusb arduino library.

My goal was to use the headset example plus two other USB CDC interfaces for other things.

Compare link:
adafruit/Adafruit_TinyUSB_Arduino@3.4.2...pschatzmann:Adafruit_TinyUSB_Arduino:Audio

At the time the Audio branch pointed to ff6ba8b

My environment is platformio using this paltformio.ini:

[env:pico]
platform = https://github.com/maxgerhardt/platform-raspberrypi.git
board = rpipico2
framework = arduino
lib_deps=
    #adafruit/Adafruit TinyUSB Library@3.4.2
    https://github.com/pschatzmann/Adafruit_TinyUSB_Arduino.git#Audio

lib_ldf_mode = deep+
lib_ignore = USBHost
; use Adafruit TinyUSB instead of builtin stack
build_flags =
    -D USE_TINYUSB

platform_packages =
    maxgerhardt/framework-arduinopico@https://github.com/earlephilhower/arduino-pico.git

upload_protocol = cmsis-dap
debug_speed = 15000
debug_tool = cmsis-dap

If I then try to cdc_multi example on the adafruit/Adafruit_TinyUSB_Arduino library the multiple ttyACM devices do pop up, but with your branch they do no. Hence I suspect there is some regression, possibly with the assignment of the usb endpoints.

It looks like this (does not enumerate multiple ttyACM devices, your rbanch called Audio @ ff6ba8b

[  +0,267801] usb 3-1.2: new full-speed USB device number 46 using xhci_hcd
[  +0,148611] usb 3-1.2: config 1 interface 2 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 0
[  +0,002971] usb 3-1.2: New USB device found, idVendor=2e8a, idProduct=000f, bcdDevice= 1.00
[  +0,000007] usb 3-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  +0,000002] usb 3-1.2: Product: Pico 2
[  +0,000002] usb 3-1.2: Manufacturer: Raspberry Pi
[  +0,000002] usb 3-1.2: SerialNumber: 289293CF4616062C
[  +0,013625] cdc_acm 3-1.2:1.0: ttyACM0: USB ACM device

Where I would expect to see it like below (works with tag 3.4.2 of the library)

[  +0,261722] usb 3-1.2: new full-speed USB device number 48 using xhci_hcd
[  +0,148194] usb 3-1.2: New USB device found, idVendor=2e8a, idProduct=000f, bcdDevice= 1.00
[  +0,000012] usb 3-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  +0,000003] usb 3-1.2: Product: Pico 2
[  +0,000002] usb 3-1.2: Manufacturer: Raspberry Pi
[  +0,000001] usb 3-1.2: SerialNumber: 289293CF4616062C
[  +0,023321] cdc_acm 3-1.2:1.0: ttyACM0: USB ACM device
[  +0,002482] cdc_acm 3-1.2:1.2: ttyACM2: USB ACM device

I had to modify the ino file a bit for it to compile, but it is basically unmodified of
https://github.com/adafruit/Adafruit_TinyUSB_Arduino/blob/3.4.2/examples/CDC/cdc_multi/cdc_multi.ino

Added this in the top of the file:

#define CFG_TUD_CDC 3
void printAll(int ch);
boolean delay_without_delaying(unsigned long time);

---

Do you have any idea why this happens? Thanks in advance :)

[nickoe]

Ohh, it looks like your current branch is based on 3.4.0 of the adafruit library. If I test that, I see the same symptom. I guess your branch needs rebasing for me to have the best of both worlds :D

When I test 3.4.1 it works again.

adafruit/Adafruit_TinyUSB_Arduino@3.4.0...adafruit:Adafruit_TinyUSB_Arduino:3.4.1

[nickoe]

Ok, PEBKAC here :D I had to define the CFG_TUD_CDC "properly".

I added it in the platformio.ini

build_flags =
    -D USE_TINYUSB
    -D CFG_TUD_CDC=2

Now everything works!

[pschatzmann]

I was working on the branch Audio1 which contains the latest changes from the source repository.
Finally I could make the Audio work again today in that branch...