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support of FunctionRemoteWake
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support of FunctionRemoteWake

RobK posted on 22 Jan 2013 5:44 AM PST
Top Contributor
56 Forum Posts

Hello,

does the FX3 support the FunctionRemoteWake-capability?

If I do a GetStatus on the first interface of a function (consisting of 3 interfaces) I get always 0x0000 for the 2 status-bytes. This would mean the device is not FunctionRemoteWake-capable (as bit D0 = 0) and I found no API where I could enable or disable this capability in the FX3-firmware?!

 

Regards,

Robert

Re: support of FunctionRemoteWake

RSKV posted on 24 Jan 2013 07:58 PM PST
Cypress Employee
655 Forum Posts

Yes. FX3 does support Function remote wake capability.

 

We have a pair of APIs that can help the device signal remote wake:

 

"CyU3PUsbSetLinkPowerState (CyU3PUsbLPM_U0)" should be called to initiate the LFPS signalling to get the USB link back to U0 from U3.

 

"CyU3PUsbSendDevNotification (1, 0, 0)" should be called to send a DEV_NOTIFICATION(FUNCTION_WAKE) TP to the host after the link is back in U0.

 

One constraint we have is that the driver will only send 0s in response to a GET_STATUS command addressed to the interface. This means that it is not possible for the application to indicate FUNCTION_WAKE support when fast enumeration is in use.

 

The work-around to this is to disable fast enumeration, and then implement only the GET_STATUS command in the Setup CB. The application can return CyFalse for all other setup commands, thus letting the driver handle them.

 

I am attaching a piece of code where this is done, and remote wakeup is performed based on GPIO interrupt.

Thanks,

sai krishna.

Re: support of FunctionRemoteWake

RSKV posted on 24 Jan 2013 08:00 PM PST
Cypress Employee
655 Forum Posts


Re: support of FunctionRemoteWake

RobK posted on 25 Jan 2013 12:07 AM PST
Top Contributor
56 Forum Posts

Thanks, that helps!



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