/*
LUFA Library
- Copyright (C) Dean Camera, 2012.
+ Copyright (C) Dean Camera, 2015.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2012 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
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
- The author disclaim all warranties with regard to this
+ The author disclaims all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
/** \ingroup Group_Serial
* \defgroup Group_Serial_AVR8 Serial USART Peripheral Driver (AVR8)
*
- * \section Sec_ModDescription Module Description
+ * \section Sec_Serial_AVR8_ModDescription Module Description
* On-chip serial USART driver for the 8-bit 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_AVR8_ExampleUsage Example Usage
* The following snippet is an example of how this module may be used within a typical
* application.
*
* \code
* // Initialize the serial USART driver before first use, with 9600 baud (and no double-speed mode)
* Serial_Init(9600, false);
- *
+ *
* // Send a string through the USART
* Serial_SendString("Test String\r\n");
*
* // Send a raw byte through the USART
* Serial_SendByte(0xDC);
- *
+ *
* // Receive a byte through the USART (or -1 if no data received)
* int16_t DataByte = Serial_ReceiveByte();
* \endcode
* \param[in] Buffer Pointer to a buffer containing the data to send.
* \param[in] Length Length of the data to send, in bytes.
*/
- void Serial_SendData(const uint8_t* Buffer, uint16_t Length) ATTR_NON_NULL_PTR_ARG(1);
+ void Serial_SendData(const void* Buffer, uint16_t Length) ATTR_NON_NULL_PTR_ARG(1);
/** Creates a standard character stream from the USART so that it can be used with all the regular functions
* in the avr-libc \c <stdio.h> library that accept a \c FILE stream as a destination (e.g. \c fprintf). The created
* \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used.
*/
void Serial_CreateStream(FILE* Stream);
-
+
/** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates
* the transfer.
*
/** 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,
+ const bool DoubleSpeed);
+ static inline void Serial_Init(const uint32_t BaudRate,
const bool DoubleSpeed)
{
UBRR1 = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
}
/** Turns off the USART driver, disabling and returning used hardware to their default configuration. */
+ static inline void Serial_Disable(void);
static inline void Serial_Disable(void)
{
UCSR1B = 0;
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.
*
+ * \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)
{
- while (!(UCSR1A & (1 << UDRE1)));
+ while (!(Serial_IsSendReady()));
UDR1 = DataByte;
}
projects / pub / USBasp.git / blobdiff