253 lines
10 KiB
C
253 lines
10 KiB
C
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2012.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.lufa-lib.org
|
|
*/
|
|
|
|
/*
|
|
Copyright 2012 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 disclaim 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_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_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 uint8_t* 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] 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(FILE* Stream);
|
|
|
|
/** 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, \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(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.
|
|
* \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)
|
|
{
|
|
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)
|
|
{
|
|
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_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
|
|
static inline bool Serial_IsCharReceived(USART_t* const USART)
|
|
{
|
|
return ((USART->STATUS & USART_RXCIF_bm) ? true : false);
|
|
}
|
|
|
|
/** Transmits a given byte through the USART.
|
|
*
|
|
* \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;
|
|
static inline void Serial_SendByte(USART_t* const USART,
|
|
const char DataByte)
|
|
{
|
|
while (!(USART->STATUS & USART_DREIF_bm));
|
|
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;
|
|
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
|
|
|
|
/** @} */
|
|
|