USB audio callback rx and tx

[jamike]

Description

Creation :

• Call back api in USBAudio device for transmission complete and reception complete.
• Specific api for filling/reading FIFO is also provided.

These apis allow to early fill/empty ISO endpoint FIFO. These early treaments which enable hardware reception/ transmission avoid to miss any periodic packet in ISO mode.

Status

READY

Migrations

This PR provides additional interfaces that can be optionally used by application.
USB_8 test demonstrates these api. No migration is needed.

[0xc0170]

cc @sg-

[jamike]

By the way, it can be noted that this patch works on K64F, the audio loopback USB_8 works while USB_7 audio loopback doesnot work.

[jamike]

Is something blocking the review process ?

[0xc0170]

Is something blocking the review process ?

The ball is on our side,e we have to review this extensions (one of the reasons is that this is currently in the unsupported folder). We shall get back to you soon. sorry for the delay.

[sg-]

Seems ok. It should be noted there is no automated testing or statement of quality about the USB code. We'd like to refactor and integrate with mbed OS 5 with testing to support the functionality and make it easier to accept contributions. Anyone interested in helping out please reach out.

@jamike please rebase to kick off testing again. thx.

[adbridge]

/morph test-nightly

[mbed-bot]

Result: SUCCESS

Your command has finished executing! Here's what you wrote!

/morph test-nightly

Output

mbed Build Number: 1294

All builds and test passed!