Added new EVENT_CDC_Device_BreakSent() event and CDC_Host_SendBreak() function to the Device and Host CDC Class drivers.

LUFA/Drivers/USB/Class/Common/CDC.h

@@ -75,6 +75,15 @@
 		/** CDC Class specific request to set the current virtual serial port handshake line states. */
 		#define REQ_SetControlLineState          0x22
 
+		/** CDC Class specific request to send a break to the receiver via the carrier channel. */
+		#define REQ_SendBreak                    0x23
+
+		/** CDC Class specific request to send an encapsulated command to the device. */
+		#define REQ_SendEncapsulatedCommand      0x00
+
+		/** CDC Class specific request to retrieve an encapsulated command response from the device. */
+		#define REQ_GetEncapsulatedResponse      0x01
+		
 		/** Notification type constant for a change in the virtual serial port handshake line states, for
 		 *  use with a USB_Notification_Header_t notification structure when sent to the host via the CDC 
 		 *  notification endpoint.

LUFA/Drivers/USB/Class/Device/CDC.c

@@ -83,6 +83,17 @@ void CDC_Device_ProcessControlRequest(USB_ClassInfo_CDC_Device_t* CDCInterfaceIn
 				Endpoint_ClearStatusStage();
 			}
 	
+			break;
+		case REQ_SendBreak:
+			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
+			{				
+				Endpoint_ClearSETUP();
+				
+				EVENT_CDC_Device_BreakSent(CDCInterfaceInfo, (uint8_t)USB_ControlRequest.wValue);
+
+				Endpoint_ClearStatusStage();
+			}
+
 			break;
 	}
 }

LUFA/Drivers/USB/Class/Device/CDC.h

@@ -190,6 +190,14 @@
 			 */
 			void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 
+			/** CDC class driver event for a send break request sent to the device from the host. This is generally used to seperate
+			 *  data or to indicate a special condition to the receiving device.
+			 *
+			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class configuration and state
+			 *  \param[in]     Duration          Duration of the break that has been sent by the host, in milliseconds
+			 */
+			void EVENT_CDC_Device_BreakSent(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, uint8_t Duration) ATTR_NON_NULL_PTR_ARG(1);
+
 			/** Sends a given string to the attached USB host, if connected. If a host is not connected when the function is called, the
 			 *  string is discarded. Bytes will be queued for transmission to the host until either the endpoint bank becomes full, or the
 			 *  \ref CDC_Device_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be 
@@ -307,6 +315,8 @@
 														  ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
 				void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 															 ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
+				void EVENT_CDC_Device_BreakSent(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, uint8_t Duration)
+				                                ATTR_WEAK ATTR_NON_NULL_PTR_ARG(1) ATTR_ALIAS(CDC_Device_Event_Stub);
 			#endif
 
 	#endif

LUFA/Drivers/USB/Class/Host/CDC.c

@@ -261,6 +261,22 @@ uint8_t CDC_Host_SendControlLineStateChange(USB_ClassInfo_CDC_Host_t* const CDCI
 	return USB_Host_SendControlRequest(NULL);
 }
 
+uint8_t CDC_Host_SendBreak(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, const uint8_t Duration)
+{
+	USB_ControlRequest = (USB_Request_Header_t)
+	{
+		.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
+		.bRequest      = REQ_SendBreak,
+		.wValue        = Duration,
+		.wIndex        = CDCInterfaceInfo->State.ControlInterfaceNumber,
+		.wLength       = 0,
+	};
+
+	Pipe_SelectPipe(PIPE_CONTROLPIPE);
+	
+	return USB_Host_SendControlRequest(NULL);
+}
+
 uint8_t CDC_Host_SendString(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, char* Data, const uint16_t Length)
 {
 	if ((USB_HostState != HOST_STATE_Configured) || !(CDCInterfaceInfo->State.IsActive))
@@ -303,8 +319,6 @@ uint8_t CDC_Host_SendByte(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, cons
 
 uint16_t CDC_Host_BytesReceived(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo)
 {
-	uint16_t BytesInPipe = 0;
-
 	if ((USB_HostState != HOST_STATE_Configured) || !(CDCInterfaceInfo->State.IsActive))
 	  return 0;
 	

LUFA/Drivers/USB/Class/Host/CDC.h

@@ -190,6 +190,16 @@
 			 */
 			uint8_t CDC_Host_SendControlLineStateChange(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 			
+			/** Sends a Send Break request to the device. This is generally used to seperate data data or to indicate a special condition
+			 *  to the receiving device.
+			 *
+			 *  \param[in,out] CDCInterfaceInfo  Pointer to a structure containing a CDC Class host configuration and state
+			 *  \param[in]     Duration          Duration of the break, in milliseconds
+			 *
+			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum
+			 */
+			uint8_t CDC_Host_SendBreak(USB_ClassInfo_CDC_Host_t* const CDCInterfaceInfo, const uint8_t Duration) ATTR_NON_NULL_PTR_ARG(1);
+			
 			/** Sends a given string to the attached USB device, if connected. If a device is not connected when the function is called, the
 			 *  string is discarded. Bytes will be queued for transmission to the device until either the pipe bank becomes full, or the
 			 *  \ref CDC_Host_Flush() function is called to flush the pending data to the host. This allows for multiple bytes to be 

LUFA/ManPages/ChangeLog.txt

@@ -15,6 +15,7 @@
   *  - Added new ATTR_NO_INIT variable attribute for global variables that should not be automatically cleared on startup
   *  - Added new ENDPOINT_*_BusSuspended error code to the Endpoint function, so that the stream functions early-abort if the bus
   *    is suspended before or during a transfer
+  *  - Added new EVENT_CDC_Device_BreakSent() event and CDC_Host_SendBreak() function to the Device and Host CDC Class drivers
   *
   *  <b>Changed:</b>
   *  - AVRISP programmer project now has a more robust timeout system