3 Replies Latest reply on Jan 24, 2013 10:00 PM by ramav_01

    support of FunctionRemoteWake

    user_173869630

      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

        • 1. Re: support of FunctionRemoteWake
          ramav_01

          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.

          • 3. Re: support of FunctionRemoteWake
            user_173869630

            Thanks, that helps!