Update documentation and reset version information post-release.

[pub/USBasp.git] / LUFA / Drivers / Peripheral / AVR8 / Serial_AVR8.h

diff --git a/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h b/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h
index f951f6b..ad8a4b6 100644 (file)
--- a/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h
+++ b/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h
@@ -1,13 +1,13 @@
 /*
              LUFA Library
 /*
              LUFA Library

-     Copyright (C) Dean Camera, 2014.
+     Copyright (C) Dean Camera, 2015.

 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*
 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*

-  Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2015  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
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted


@@ -168,7 +168,8 @@
                        /** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to
                         *  standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
                         *
                        /** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to
                         *  standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
                         *

-                        *  \param[in] BaudRate     Serial baud rate, in bits per second.
+                        *  \param[in] BaudRate     Serial baud rate, in bits per second. This should be the target baud rate regardless of the
+                        *                          \c DoubleSpeed parameter's value.

                         *  \param[in] DoubleSpeed  Enables double speed mode when set, halving the sample time to double the baud rate.
                         */
                        static inline void Serial_Init(const uint32_t BaudRate,
                         *  \param[in] DoubleSpeed  Enables double speed mode when set, halving the sample time to double the baud rate.
                         */
                        static inline void Serial_Init(const uint32_t BaudRate,


@@ -210,14 +211,39 @@
                                return ((UCSR1A & (1 << RXC1)) ? true : false);
                        }
 
                                return ((UCSR1A & (1 << RXC1)) ? 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.
+                        *
+                        *  \return Boolean \c true if a character can be queued for transmission immediately, \c false otherwise.
+                        */
+                       static inline bool Serial_IsSendReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+                       static inline bool Serial_IsSendReady(void)
+                       {
+                               return ((UCSR1A & (1 << UDRE1)) ? true : false);
+                       }
+
+                       /** Indicates whether the hardware USART transmit buffer is completely empty, indicating all
+                        *  pending transmissions have completed.
+                        *
+                        *  \return Boolean \c true if no characters are buffered for transmission, \c false otherwise.
+                        */
+                       static inline bool Serial_IsSendComplete(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+                       static inline bool Serial_IsSendComplete(void)
+                       {
+                               return ((UCSR1A & (1 << TXC1)) ? true : false);
+                       }
+

                        /** Transmits a given byte through the USART.
                         *
                        /** 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] DataByte  Byte to transmit through the USART.
                         */
                        static inline void Serial_SendByte(const char DataByte) ATTR_ALWAYS_INLINE;
                        static inline void Serial_SendByte(const char DataByte)
                        {
                         *  \param[in] DataByte  Byte to transmit through the USART.
                         */
                        static inline void Serial_SendByte(const char DataByte) ATTR_ALWAYS_INLINE;
                        static inline void Serial_SendByte(const char DataByte)
                        {

-                               while (!(UCSR1A & (1 << UDRE1)));
+                               while (!(Serial_IsSendReady()));

                                UDR1 = DataByte;
                        }
 
                                UDR1 = DataByte;
                        }