Cannot get Audio to write out at full data sample rate

hathach / tinyusb

An open source cross-platform USB stack for embedded system

https://www.tinyusb.org

MIT License

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Cannot get Audio to write out at full data sample rate #635

Closed ndinsmore closed 3 years ago

ndinsmore commented 3 years ago

Set up [Mandatory] Provide details of your setup help us to reproduce the issue as quick as possible

PC OS : osx 10.15
Board : pi pico
Firmware: examples/device/uac2_audio_headset or examples/device/audio_test

Describe the bug On the pico the callback to fill the transfer buffer are only getting called 200-500 times a second, if I try to up the data size the callback frequency goes down. When sending data what controls the callback frequency?

PanRe commented 3 years ago

Every time the host collected or sent data an interrupt triggers a callback function within the audio driver in which a new transmit for receive or transmit is scheduled.

There is a new design for the audio driver on its rollout, completely redesigning how data is copied. However, i can not say when the PR is finished.

ndinsmore commented 3 years ago

This issue was a bug caused by the pico dcd fifo implementation, and a buffer overrun. It can now be closed.