RP2040: USB data stopping

[DynamoBen]

I created a test program that loops turning a MIDI note on and off. After running for a while (minutes not hours) I lose USB communications (both USB-MIDI and serial debug). I have the LED flashing to debug and it appears the loop is continuing it's just USB comms that stops inexplicably.

This is only reproducible on one of my Wins10 PCs (Dell XPS desktop) and the USB driver is still active when data isn't flowing. Further if I switch to a Teensy 4.0 running the same test (written in C++) USB comms continues indefinitely.

See forum thread for troubleshooting details: https://forums.adafruit.com/viewtopic.php?f=60&t=175112&p=854548 ]

[edit by dhalbert: on RPi Pico]

[hathach]

There is tinyusb PR that fix this issue recently, please try to manually update tinyusb to see if that fix your issue

hathach/tinyusb#618

[dhalbert]

@DynamoBen Here is a build for the Pico that updates tinyusb to the tip of its master branch as of now. The commit hash is in the filename:
pico-with-tinyusb-at-09868434c.uf2.zip

Could you test with this and see if it improves things? Thanks.

I only tested this enough to see that it presents the REPL and CIRCUITPY.

[DynamoBen]

@dhalbert Some progress, now my test app is locking up instead of USB comms stopping.

[DynamoBen]

Grabbed latest (adafruit-circuitpython-raspberry_pi_pico-en_US-20210223-cca6cfe) this morning and haven't see any problems. I'll check it again in a few hours and will post an update if it fails.

[DynamoBen]

Sadly USB comms are still stopping. I will continue to try future builds I guess.

[hathach]

did you call midi read from your firmware application. The data is stored in midi fifo and need to be retrieved else it will be full and prevent further data transfer. It is mentioned in the hathach/tinyusb#618 discussion

[DynamoBen]

My tests thus far have been limited to transmitting MIDI. However I did update my test code to include a read but it made no difference.

[tannewt]

Note we have a TinyUSB update in #4245

[DynamoBen]

I've been trying the latest build the last several days and the symptom now is the application not running ("locked up").

[hathach]

can you post your updated script to your first post, so that other could reproduce as well when they try to take a look

[DynamoBen]

Test code: code.zip