Added new USB_Host_SetDeviceConfiguration() convenience function. Change over Low Level host demos to use the new routine.

LUFA/Drivers/USB/LowLevel/Host.c

@@ -285,4 +285,21 @@ static void USB_Host_ResetDevice(void)
 
 	USB_INT_Enable(USB_INT_DDISCI);
 }
+
+uint8_t USB_Host_SetDeviceConfiguration(uint8_t ConfigNumber)
+{
+	USB_ControlRequest = (USB_Request_Header_t)
+		{
+			.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_DEVICE),
+			.bRequest      = REQ_SetConfiguration,
+			.wValue        = ConfigNumber,
+			.wIndex        = 0,
+			.wLength       = 0,
+		};
+
+	Pipe_SelectPipe(PIPE_CONTROLPIPE);
+	
+	return USB_Host_SendControlRequest(NULL);
+}
+
 #endif

LUFA/Drivers/USB/LowLevel/Host.h

@@ -173,6 +173,19 @@
 				#define USB_Host_IsResumeFromWakeupRequestSent() ((UHCON &   (1 << RESUME)) ? false : true)
 			#endif
 
+		/* Function Prototypes: */
+			/** Convenience function. This routine sends a SetConfiguration standard request to the attached
+			 *  device, with the given configuration index. This can be used to easily set the device
+			 *  configuration without creating and sending the request manually.
+			 *
+			 *  \note After this routine returns, the control pipe will be selected.
+			 *
+			 *  \param ConfigNumber  Configuration index to send to the device
+			 *
+			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum to indicate the result.
+			 */
+			uint8_t USB_Host_SetDeviceConfiguration(uint8_t ConfigNumber);
+
 		/* Enums: */
 			/** Enum for the various states of the USB Host state machine. Only some states are
 			 *  implemented in the LUFA library - other states are left to the user to implement.