c7aceb2c7f
Init function of the Serial driver is now static inline to product smaller code for the common-case of static init.
147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Driver for the USART subsystem on supported USB AVRs.
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*/
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/** \ingroup Group_PeripheralDrivers
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* @defgroup Group_Serial Serial USART Driver - LUFA/Drivers/Peripheral/Serial.h
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*
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* \section Sec_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - LUFA/Drivers/Peripheral/Serial.c
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*
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* \section Module Description
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* Functions, macros, variables, enums and types related to the setup of the USART for serial communications.
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*
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* @{
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*/
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#ifndef __SERIAL_H__
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#define __SERIAL_H__
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/* Includes: */
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <stdbool.h>
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#include "../../Common/Common.h"
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#include "../Misc/TerminalCodes.h"
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
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* not set.
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*/
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#define SERIAL_UBBRVAL(baud) (((F_CPU / 16) / baud) - 1)
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/** Macro for calculating the baud value from a given baud rate when the U2X (double speed) bit is
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* set.
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*/
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#define SERIAL_2X_UBBRVAL(baud) (((F_CPU / 8) / baud) - 1)
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/* Pseudo-Function Macros: */
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#if defined(__DOXYGEN__)
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/** Indicates whether a character has been received through the USART.
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*
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* \return Boolean true if a character has been received, false otherwise
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*/
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static inline bool Serial_IsCharReceived(void);
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#else
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#define Serial_IsCharReceived() ((UCSR1A & (1 << RXC1)) ? true : false)
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#endif
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/* Function Prototypes: */
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/** Transmits a given string located in program space (FLASH) through the USART.
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*
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* \param FlashStringPtr Pointer to a string located in program space
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*/
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void Serial_TxString_P(const char *FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1);
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/** Transmits a given string located in SRAM memory through the USART.
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*
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* \param StringPtr Pointer to a string located in SRAM space
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*/
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void Serial_TxString(const char *StringPtr) ATTR_NON_NULL_PTR_ARG(1);
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/* Inline Functions: */
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/** Initializes the USART, ready for serial data transmission and reception. This initialises the interface to
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* standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
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*
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* \param BaudRate Serial baud rate, in bits per second
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* \param DoubleSpeed Enables double speed mode when set, halving the sample time to double the baud rate
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*/
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static inline void Serial_Init(const uint32_t BaudRate, const bool DoubleSpeed)
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{
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UCSR1A = (DoubleSpeed ? (1 << U2X1) : 0);
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UCSR1B = ((1 << TXEN1) | (1 << RXEN1));
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UCSR1C = ((1 << UCSZ11) | (1 << UCSZ10));
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DDRD |= (1 << 3);
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PORTD |= (1 << 2);
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UBRR1 = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
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}
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/** Transmits a given byte through the USART.
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*
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* \param DataByte Byte to transmit through the USART
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*/
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static inline void Serial_TxByte(const char DataByte)
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{
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while (!(UCSR1A & (1 << UDRE1)));
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UDR1 = DataByte;
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}
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/** Receives a byte from the USART.
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*
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* \return Byte received from the USART
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*/
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static inline char Serial_RxByte(void)
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{
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while (!(UCSR1A & (1 << RXC1)));
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return UDR1;
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}
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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