X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/16e8fe9878944f7bcd69cb6e6636ba8b9c574ab9..df366e055d7c3831bd40d96efe3a91cdeb31e2dd:/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h

diff --git a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
index b5af9c6e2..ad34c8535 100644
--- a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
+++ b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2013.
+     Copyright (C) Dean Camera, 2014.
 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*
-  Copyright 2013  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -40,13 +40,13 @@
 /** \ingroup Group_Serial
  *  \defgroup Group_Serial_XMEGA Serial USART Peripheral Driver (XMEGA)
  *
- *  \section Sec_ModDescription Module Description
+ *  \section Sec_Serial_XMEGA_ModDescription Module Description
  *  On-chip serial USART driver for the XMEGA AVR microcontrollers.
  *
  *  \note This file should not be included directly. It is automatically included as needed by the USART driver
  *        dispatch header located in LUFA/Drivers/Peripheral/Serial.h.
  *
- *  \section Sec_ExampleUsage Example Usage
+ *  \section Sec_Serial_XMEGA_ExampleUsage Example Usage
  *  The following snippet is an example of how this module may be used within a typical
  *  application.
  *
@@ -216,8 +216,37 @@
 				return ((USART->STATUS & USART_RXCIF_bm) ? true : false);
 			}
 
+			/** Indicates whether there is hardware buffer space for a new transmit on the USART. This
+			 *  function can be used to determine if a call to \ref Serial_SendByte() will block in advance.
+			 *
+			 *  \param[in,out] USART  Pointer to the base of the USART peripheral within the device.
+			 *
+			 *  \return Boolean \c true if a character can be queued for transmission immediately, \c false otherwise.
+			 */
+			static inline bool Serial_IsSendReady(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+			static inline bool Serial_IsSendReady(USART_t* const USART)
+			{
+				return (USART->STATUS & USART_DREIF_bm) ? true : false;
+			}
+
+			/** Indicates whether the hardware USART transmit buffer is completely empty, indicating all
+			 *  pending transmissions have completed.
+			 *
+			 *  \param[in,out] USART  Pointer to the base of the USART peripheral within the device.
+			 *
+			 *  \return Boolean \c true if no characters are buffered for transmission, \c false otherwise.
+			 */
+			static inline bool Serial_IsSendComplete(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
+			static inline bool Serial_IsSendComplete(USART_t* const USART)
+			{
+				return (USART->STATUS & USART_TXCIF_bm) ? true : false;
+			}
+
 			/** Transmits a given byte through the USART.
 			 *
+			 *  \note If no buffer space is available in the hardware USART, this function will block. To check if
+			 *        space is available before calling this function, see \ref Serial_IsSendReady().
+			 *
 			 *  \param[in,out] USART     Pointer to the base of the USART peripheral within the device.
 			 *  \param[in]     DataByte  Byte to transmit through the USART.
 			 */
@@ -226,7 +255,7 @@
 			static inline void Serial_SendByte(USART_t* const USART,
 			                                   const char DataByte)
 			{
-				while (!(USART->STATUS & USART_DREIF_bm));
+				while (!(Serial_IsSendReady(USART)));
 				USART->DATA = DataByte;
 			}