USB midi gadget fails when connected to Mac (i.MX28 2.6.35)

[LarsChristensen]

Dear all,

We have a setup where we need a large block of data to be sent via midi to our target.

The midi gadget is being used and WIN7 see’s our target as a midi device. Our WIN7 application is capable of sending the large block of data without any problems.

If we connect our target to a MAC, the mac detects our target as a midi device, but our MAC application hangs, and the target outputs the following message:

udc: dTD error 00000060 QH=2

It should be mentioned that our WIN7 and MAC applications work with other midi products not running on a Linux platform.

We’ve tried several patches:

Peter Chan’s https://community.freescale.com/thread/314371

Disabling USB stream mode in the usbmode register.

Setting the FORCE_FULL_SPEED bit in the portsc1 register still hangs the MAC application at 0%, but the dTD error doesn’t happen.

Any help is appreciated

Regards,

Lars

[YixingKong]

Lars

This discussion is closed since no activity. If you still need help, please feel free to reply with an update to this discussion, or create another discussion.

Thanks,

Yixing

[YixingKong]

Lars

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,
Yixing

[fabio_estevam]

Can you try this with kernel 3.12?

Regards,

Fabio Estevam