/*
LUFA Library
- Copyright (C) Dean Camera, 2010.
-
+ Copyright (C) Dean Camera, 2011.
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
- Permission to use, copy, modify, distribute, and sell this
+ Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
+ without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
*
* Driver for the USART subsystem on supported USB AVRs.
*/
-
+
/** \ingroup Group_PeripheralDrivers
* @defgroup Group_Serial Serial USART Driver - LUFA/Drivers/Peripheral/Serial.h
*
* \section Sec_Dependencies Module Source Dependencies
* The following files must be built with any user project that uses this module:
- * - LUFA/Drivers/Peripheral/Serial.c
+ * - LUFA/Drivers/Peripheral/Serial.c <i>(Makefile source module name: LUFA_SRC_SERIAL)</i>
*
- * \section Module Description
+ * \section Sec_ModDescription Module Description
* Hardware serial USART driver. This module provides an easy to use driver for
* the setup of and transfer of data over the AVR's USART port.
*
+ * \section Sec_ExampleUsage Example Usage
+ * The following snippet is an example of how this module may be used within a typical
+ * application.
+ *
+ * \code
+ * // Initialise 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_TxString("Test String\r\n");
+ *
+ * // Receive a byte through the USART
+ * uint8_t DataByte = Serial_RxByte();
+ * \endcode
+ *
* @{
*/
-
+
#ifndef __SERIAL_H__
#define __SERIAL_H__
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <stdbool.h>
-
+ #include <stdio.h>
+
#include "../../Common/Common.h"
#include "../Misc/TerminalCodes.h"
extern "C" {
#endif
+ /* Private Interface - For use in library only: */
+ #if !defined(__DOXYGEN__)
+ /* External Variables: */
+ extern FILE USARTSerialStream;
+
+ /* Function Prototypes: */
+ int Serial_putchar(char DataByte,
+ FILE *Stream);
+ int Serial_getchar(FILE *Stream);
+ int Serial_getchar_Blocking(FILE *Stream);
+ #endif
+
/* Public Interface - May be used in end-application: */
/* Macros: */
/** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
*/
#define SERIAL_2X_UBBRVAL(baud) ((((F_CPU / 8) + (baud / 2)) / (baud)) - 1)
- /* Pseudo-Function Macros: */
- #if defined(__DOXYGEN__)
- /** Indicates whether a character has been received through the USART.
- *
- * \return Boolean true if a character has been received, false otherwise
- */
- static inline bool Serial_IsCharReceived(void);
- #else
- #define Serial_IsCharReceived() ((UCSR1A & (1 << RXC1)) ? true : false)
- #endif
-
/* Function Prototypes: */
/** Transmits a given string located in program space (FLASH) through the USART.
*
- * \param[in] FlashStringPtr Pointer to a string located in program space
+ * \param[in] FlashStringPtr Pointer to a string located in program space.
*/
- void Serial_TxString_P(const char *FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1);
+ void Serial_SendString_P(const char* FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1);
/** Transmits a given string located in SRAM memory through the USART.
*
- * \param[in] StringPtr Pointer to a string located in SRAM space
+ * \param[in] StringPtr Pointer to a string located in SRAM space.
+ */
+ void Serial_SendString(const char* StringPtr) ATTR_NON_NULL_PTR_ARG(1);
+
+ /** Transmits a given buffer located in SRAM memory through the USART.
+ *
+ * \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_TxString(const char *StringPtr) ATTR_NON_NULL_PTR_ARG(1);
+ void Serial_SendData(const uint8_t* Buffer, uint16_t Length) ATTR_NON_NULL_PTR_ARG(1);
/* Inline Functions: */
/** 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] DoubleSpeed Enables double speed mode when set, halving the sample time to double the baud rate
+ * \param[in] BaudRate Serial baud rate, in bits per second.
+ * \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));
+
+ UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
UCSR1A = (DoubleSpeed ? (1 << U2X1) : 0);
UCSR1B = ((1 << TXEN1) | (1 << RXEN1));
- UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
-
- DDRD |= (1 << 3);
+
+ DDRD |= (1 << 3);
PORTD |= (1 << 2);
-
- 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_ShutDown(void)
+ static inline void Serial_Disable(void)
{
- UCSR1A = 0;
UCSR1B = 0;
+ UCSR1A = 0;
UCSR1C = 0;
-
- DDRD &= ~(1 << 3);
- PORTD &= ~(1 << 2);
-
+
UBRR1 = 0;
+
+ DDRD &= ~(1 << 3);
+ PORTD &= ~(1 << 2);
}
+
+ /** 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
+ * stream is bidirectional and can be used for both input and output functions.
+ *
+ * Reading data from this stream is non-blocking, i.e. in most instances, complete strings cannot be read in by a single
+ * fetch, as the endpoint will not be ready at some point in the transmission, aborting the transfer. However, this may
+ * be used when the read data is processed byte-per-bye (via \c getc()) or when the user application will implement its own
+ * line buffering.
+ *
+ * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL stdio
+ * and stdin will be configured to use the USART.
+ *
+ * \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used.
+ */
+ static inline void Serial_CreateStream(FILE* Stream)
+ {
+ if (!(Stream))
+ {
+ Stream = &USARTSerialStream;
+ stdin = Stream;
+ stdout = Stream;
+ }
+ *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar, _FDEV_SETUP_RW);
+ }
+
+ /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates
+ * the transfer.
+ *
+ * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL stdio
+ * and stdin will be configured to use the USART.
+ *
+ * \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used.
+ */
+ static inline void Serial_CreateBlockingStream(FILE* Stream)
+ {
+ if (!(Stream))
+ {
+ Stream = &USARTSerialStream;
+ stdin = Stream;
+ stdout = Stream;
+ }
+
+ *Stream = (FILE)FDEV_SETUP_STREAM(Serial_putchar, Serial_getchar_Blocking, _FDEV_SETUP_RW);
+ }
+
+ /** Indicates whether a character has been received through the USART.
+ *
+ * \return Boolean \c true if a character has been received, \c false otherwise.
+ */
+ static inline bool Serial_IsCharReceived(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline bool Serial_IsCharReceived(void)
+ {
+ return ((UCSR1A & (1 << RXC1)) ? true : false);
+ }
+
/** Transmits a given byte through the USART.
*
- * \param[in] DataByte Byte to transmit through the USART
+ * \param[in] DataByte Byte to transmit through the USART.
*/
- static inline void Serial_TxByte(const char DataByte)
+ static inline void Serial_SendByte(const char DataByte) ATTR_ALWAYS_INLINE;
+ static inline void Serial_SendByte(const char DataByte)
{
while (!(UCSR1A & (1 << UDRE1)));
UDR1 = DataByte;
}
- /** Receives a byte from the USART.
+ /** Receives the next byte from the USART.
*
- * \return Byte received from the USART
+ * \return Next byte received from the USART, or a negative value if no byte has been received.
*/
- static inline char Serial_RxByte(void)
+ static inline int16_t Serial_ReceiveByte(void) ATTR_ALWAYS_INLINE;
+ static inline int16_t Serial_ReceiveByte(void)
{
- while (!(UCSR1A & (1 << RXC1)));
- return UDR1;
+ if (!(Serial_IsCharReceived()))
+ return -1;
+
+ return UDR1;
}
/* Disable C linkage for C++ Compilers: */
#if defined(__cplusplus)
}
#endif
-
+
#endif
/** @} */
+
projects / pub / USBasp.git / blobdiff