:: //Check if the endpoint has received any data from the host.
::     if(!USBHandleBusy(USBGenericOutHandle)) {
::       // ... USB OUT packet handling code goes here ...
::     }

Out of interest, what happens if you move the function call out of the 
IF statement and assign the result to a temporary variable?

USB_result = USBGenericOutHandle();

if(!USB_result){
   etc etc
}

Perhaps the compiler is removing something that it might not 
otherwise.
--
cdb, colin@btech-online.co.uk on 11/15/2009
 
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