Am335 make D+ high in OTG mode

Hariprasad kb

Hi,

We are using Am335 based board and i want to do USB role switch form host to device mode,for this i connect dual role device() musb.0 in host mode

For role switching i do following steps:

i send vendor specific command to the dual device and it will disconnect form the bus and now i want to make d+ high to indicate to the device that it can switch to HOST mode and enumerate the musb.0 as a device.

My question is how to make D+ high after device disconnects form the bus.

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

See section 16.3.3 in the AM335X Technical Reference Manual Rev. J.

0 Hariprasad kb over 11 years ago in reply to Biser Gatchev-XID

Prodigy 210 points

Hi Biser,

Thanks for the support.

Is there any function implemented in the current firmware to make D+ high and to switch to device mode,i want to know the procedure to switch to gadget mode (in musb firmware state machine values).

0 Biser Gatchev-XID over 11 years ago in reply to Hariprasad kb

TI__Guru**** 393215 points

Which firmware do you have in mind? Linux SDK?

0 Hariprasad kb over 11 years ago in reply to Biser Gatchev-XID

Prodigy 210 points

yes ,Linux SDK (ti-sdk-am335x-evm).

0 Biser Gatchev-XID over 11 years ago in reply to Hariprasad kb

TI__Guru**** 393215 points

As far as I know the SDK relies on the hardware ID pin state when an external cable is attached to the USB connector.

0 Hariprasad kb over 11 years ago in reply to Biser Gatchev-XID

Prodigy 210 points

Okay ,

i want to know the state machine values and sequence of function calls to switch from Host to device mode(when A-type connector is removed form the OTG port).

0 Biser Gatchev-XID over 11 years ago in reply to Hariprasad kb

TI__Guru**** 393215 points

Sorry, I can't help here.

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Am335 make D+ high in OTG mode