An USB hub connected to Kinetis K61 USBOTG (USBFS) controller

[konstantinlazar]

Hello,

We have MCU K61 is used with uClinux.

USB hub is connected to K61 USBOTG (USBFS) controller in host mode. The hub is successfully enumerated by Linux with khci hcd driver. But when the hub's interrupt pipe polled for status hub returns NAK all the time. No USB devices connected to the hub can be detected.

On other hand a single USB device connected to K61 USBOTG controller port works just file.

Please advise how to make USB hub work with K61 USBOTG controller under uClinux.

Thank you,

Konstantin Lazarev.

[isaacavila]

Hello,

Have you tried to use another HUB?

I do not know how uClinux manages USB module but it would be good to check if there is a "USB supported devices" list for uClinux and khci hcd driver. Maybe you can find HUB's support information at http://www.uclinux.org/

Best regards,

Isaac

[konstantinlazar]

Yes, we have tried with several different USB hubs connected directly to USBFS port. All hubs were properly enumerated but they did not send port status update only NAK in response of input INT frame.

uClinux distribution at http://www.uclinux.org/ does not seem to  have support for Kinetis K61/K70 or KHI USB controller.

Regards,

Konstantin Lazarev.