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Diffstat (limited to 'LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h')
| -rw-r--r-- | LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h new file mode 100644 index 0000000000..36f507d43e --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h @@ -0,0 +1,289 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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 + 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 + software without specific, written prior permission. + + 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 + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * \brief Serial USART Peripheral Driver (XMEGA) + * + * 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. + */ + +/** \ingroup Group_Serial + * \defgroup Group_Serial_XMEGA Serial USART Peripheral Driver (XMEGA) + * + * \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_Serial_XMEGA_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(&USARTD0, 9600, false); + * + * // Send a string through the USART + * Serial_TxString(&USARTD0, "Test String\r\n"); + * + * // Receive a byte through the USART + * uint8_t DataByte = Serial_RxByte(&USARTD0); + * \endcode + * + * @{ + */ + +#ifndef __SERIAL_XMEGA_H__ +#define __SERIAL_XMEGA_H__ + + /* Includes: */ + #include "../../../Common/Common.h" + #include "../../Misc/TerminalCodes.h" + + #include <stdio.h> + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Preprocessor Checks: */ + #if !defined(__INCLUDE_FROM_SERIAL_H) && !defined(__INCLUDE_FROM_SERIAL_C) + #error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead. + #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 \c U2X (double speed) bit is + * not set. + * + * \param[in] Baud Target serial UART baud rate. + * + * \return Closest UBRR register value for the given UART frequency. + */ + #define SERIAL_UBBRVAL(Baud) ((((F_CPU / 16) + (Baud / 2)) / (Baud)) - 1) + + /** Macro for calculating the baud value from a given baud rate when the \c U2X (double speed) bit is + * set. + * + * \param[in] Baud Target serial UART baud rate. + * + * \return Closest UBRR register value for the given UART frequency. + */ + #define SERIAL_2X_UBBRVAL(Baud) ((((F_CPU / 8) + (Baud / 2)) / (Baud)) - 1) + + /* Function Prototypes: */ + /** Transmits a given string located in program space (FLASH) through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] FlashStringPtr Pointer to a string located in program space. + */ + void Serial_SendString_P(USART_t* const USART, + const char* FlashStringPtr) ATTR_NON_NULL_PTR_ARG(1); + + /** Transmits a given string located in SRAM memory through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in] StringPtr Pointer to a string located in SRAM space. + */ + void Serial_SendString(USART_t* const USART, + const char* StringPtr) ATTR_NON_NULL_PTR_ARG(1); + + /** Transmits a given buffer located in SRAM memory through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \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(USART_t* const USART, + 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 + * 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] USART Pointer to the base of the USART peripheral within the device. + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL, \c stdout + * and \c 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. + */ + void Serial_CreateStream(USART_t* USART, FILE* Stream); + + /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates + * the transfer. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL, \c stdout + * and \c 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. + */ + void Serial_CreateBlockingStream(USART_t* USART, FILE* Stream); + + /* 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,out] USART Pointer to the base of the USART peripheral within the device. + * \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(USART_t* const USART, + const uint32_t BaudRate, + const bool DoubleSpeed) ATTR_NON_NULL_PTR_ARG(1); + static inline void Serial_Init(USART_t* const USART, + const uint32_t BaudRate, + const bool DoubleSpeed) + { + uint16_t BaudValue = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate)); + + USART->BAUDCTRLB = (BaudValue >> 8); + USART->BAUDCTRLA = (BaudValue & 0xFF); + + USART->CTRLC = (USART_CMODE_ASYNCHRONOUS_gc | USART_PMODE_DISABLED_gc | USART_CHSIZE_8BIT_gc); + USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm | (DoubleSpeed ? USART_CLK2X_bm : 0)); + } + + /** Turns off the USART driver, disabling and returning used hardware to their default configuration. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + */ + static inline void Serial_Disable(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void Serial_Disable(USART_t* const USART) + { + USART->CTRLA = 0; + USART->CTRLB = 0; + USART->CTRLC = 0; + } + + /** Indicates whether a character has been received through the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return Boolean \c true if a character has been received, \c false otherwise. + */ + static inline bool Serial_IsCharReceived(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline bool Serial_IsCharReceived(USART_t* const USART) + { + 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. + */ + static inline void Serial_SendByte(USART_t* const USART, + const char DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void Serial_SendByte(USART_t* const USART, + const char DataByte) + { + while (!(Serial_IsSendReady(USART))); + USART->DATA = DataByte; + } + + /** Receives the next byte from the USART. + * + * \param[in,out] USART Pointer to the base of the USART peripheral within the device. + * + * \return Next byte received from the USART, or a negative value if no byte has been received. + */ + static inline int16_t Serial_ReceiveByte(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline int16_t Serial_ReceiveByte(USART_t* const USART) + { + if (!(Serial_IsCharReceived(USART))) + return -1; + + USART->STATUS = USART_RXCIF_bm; + return USART->DATA; + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |