Update XMEGA clock management so that the correct 16-bit calibration is used when requested. Fix endpoint descriptor table so that the frame number is stored into the correct location. Add compile time option to source the USB clock from the PLL rather than the internal 32MHz RC oscillator.

LUFA/Drivers/USB/Core/XMEGA/Endpoint_XMEGA.h

@@ -231,8 +231,10 @@
 				                        ((EndpointNumber & ENDPOINT_DIR_IN) ? 0x01 : 0);
 
 				Endpoint_SelectedEndpoint       = EndpointNumber;
-				Endpoint_SelectedEndpointHandle = &((USB_EP_t*)&USB_EndpointTable.Endpoints)[EPTableIndex];
 				Endpoint_SelectedEndpointAux    = &Endpoint_AuxData[EPTableIndex];
+				Endpoint_SelectedEndpointHandle = (EndpointNumber & ENDPOINT_DIR_IN) ?
+				                                   &USB_EndpointTable.Endpoints[EndpointNumber & ENDPOINT_EPNUM_MASK].IN :
+				                                   &USB_EndpointTable.Endpoints[EndpointNumber & ENDPOINT_EPNUM_MASK].OUT;
 			}
 
 			/** Configures the specified endpoint number with the given endpoint type, direction, bank size

LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.c

@@ -101,10 +101,15 @@ void USB_Disable(void)
 void USB_ResetInterface(void)
 {
 	if (USB_Options & USB_DEVICE_OPT_LOWSPEED)
-	  CLK.USBCTRL = ((((F_USB / 6000000) - 1) << CLK_USBPSDIV_gp) | CLK_USBSRC_PLL_gc | CLK_USBSEN_bm);
+	  CLK.USBCTRL = (((F_USB / 6000000) - 1) << CLK_USBPSDIV_gp);
 	else
-	  CLK.USBCTRL = ((((F_USB / 48000000) - 1) << CLK_USBPSDIV_gp) | CLK_USBSRC_PLL_gc | CLK_USBSEN_bm);
+	  CLK.USBCTRL = (((F_USB / 48000000) - 1) << CLK_USBPSDIV_gp);
 	
+	if (USB_Options & USB_OPT_PLLCLKSRC)
+	  CLK.USBCTRL |= (CLK_USBSRC_PLL_gc | CLK_USBSEN_bm);
+	else
+	  CLK.USBCTRL |= (CLK_USBSRC_RC32M_gc | CLK_USBSEN_bm);
+
 	USB_Device_SetDeviceAddress(0);
 	
 	USB_INT_DisableAllInterrupts();

LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.h

@@ -60,12 +60,12 @@
 		/* Type Defines: */
 			typedef struct
 			{
-				uint16_t FrameNum;
 				struct
 				{
 					USB_EP_t OUT;
 					USB_EP_t IN;
 				} Endpoints[16];
+				uint16_t FrameNum;
 			} ATTR_PACKED USB_EndpointTable_t;
 	
 		/* External Variables: */
@@ -113,6 +113,12 @@
 			 *  and resume events, bus reset events and other events related to the management of the USB bus.
 			 */
 			#define USB_OPT_BUSEVENT_PRIHIGH          ((1 << 2) | (0 << 1))
+
+			/** Sets the USB controller to source its clock from the internal RC 32MHz clock, once it has been DFLL calibrated to 48MHz. */
+			#define USB_OPT_RC32MCLKSRC               (0 << 3)
+
+			/** Sets the USB controller to source its clock from the internal PLL. */
+			#define USB_OPT_PLLCLKSRC                 (1 << 3)
 			//@}
 
 			#if !defined(USB_STREAM_TIMEOUT_MS) || defined(__DOXYGEN__)

LUFA/Platform/XMEGA/ClockManagement.h

@@ -263,14 +263,7 @@
 			                                      const uint8_t Reference,
 			                                      const uint32_t Frequency)
 			{
-				uint16_t DFLLCompare = (Frequency / 1024);
-				uint16_t DFFLCal     = 0;
-
-				if (Reference == DFLL_REF_INT_USBSOF)
-				{
-					NVM.CMD = NVM_CMD_READ_CALIB_ROW_gc;
-					DFFLCal = ((0x00 << 8) | pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, USBRCOSC)));
-				}
+				uint16_t DFLLCompare = (Frequency / 1000);
 				
 				switch (Source)
 				{
@@ -278,16 +271,21 @@
 						OSC.DFLLCTRL   |= (Reference << OSC_RC2MCREF_bp);
 						DFLLRC2M.COMP1  = (DFLLCompare & 0xFF);
 						DFLLRC2M.COMP2  = (DFLLCompare >> 8);
-						DFLLRC2M.CALA   = (DFFLCal & 0xFF);
-						DFLLRC2M.CALB   = (DFFLCal >> 8);
 						DFLLRC2M.CTRL   = DFLL_ENABLE_bm;
 						break;
 					case CLOCK_SRC_INT_RC32MHZ:
 						OSC.DFLLCTRL   |= (Reference << OSC_RC32MCREF_gp);
 						DFLLRC32M.COMP1 = (DFLLCompare & 0xFF);
 						DFLLRC32M.COMP2 = (DFLLCompare >> 8);
-						DFLLRC32M.CALA  = (DFFLCal & 0xFF);
-						DFLLRC32M.CALB  = (DFFLCal >> 8);
+
+						if (Reference == DFLL_REF_INT_USBSOF)
+						{
+							NVM.CMD        = NVM_CMD_READ_CALIB_ROW_gc;
+							DFLLRC32M.CALA = pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, USBRCOSCA));
+							NVM.CMD        = NVM_CMD_READ_CALIB_ROW_gc;
+							DFLLRC32M.CALB = pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, USBRCOSC));
+						}
+
 						DFLLRC32M.CTRL  = DFLL_ENABLE_bm;
 						break;
 					default: