+++ /dev/null
-/*
- * This file is part of the libserialport project.
- *
- * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/**
- * @mainpage libserialport API
- *
- * Introduction
- * ============
- *
- * libserialport is a minimal library written in C that is intended to take
- * care of the OS-specific details when writing software that uses serial ports.
- *
- * By writing your serial code to use libserialport, you enable it to work
- * transparently on any platform supported by the library.
- *
- * The operations that are supported are:
- *
- * - @ref Enumeration (obtaining a list of serial ports on the system)
- * - @ref Ports
- * - @ref Configuration (baud rate, parity, etc.)
- * - @ref Data
- * - @ref Errors
- *
- * libserialport is an open source project released under the LGPL3+ license.
- *
- * API principles
- * ==============
- *
- * The API is simple, and designed to be a minimal wrapper around the serial
- * port support in each OS.
- *
- * Most functions take a pointer to a struct sp_port, which represents a serial
- * port. These structures are always allocated and freed by the library, using
- * the functions in the @ref Enumeration "Enumeration" section.
- *
- * All functions can return only four possible error values:
- *
- * - @ref SP_ERR_ARG means that a function was called with invalid
- * arguments. This implies a bug in the caller. The arguments passed would
- * be invalid regardless of the underlying OS or serial device involved.
- *
- * - @ref SP_ERR_FAIL means that the OS reported a failure. The error code or
- * message provided by the OS can be obtained by calling sp_last_error_code()
- * or sp_last_error_message().
- *
- * - @ref SP_ERR_SUPP indicates that there is no support for the requested
- * operation in the current OS, driver or device. No error message is
- * available from the OS in this case. There is either no way to request
- * the operation in the first place, or libserialport does not know how to
- * do so in the current version.
- *
- * - @ref SP_ERR_MEM indicates that a memory allocation failed.
- *
- * All of these error values are negative.
- *
- * Function calls that succeed return @ref SP_OK, which is equal to zero,
- * or where otherwise documented a positive value.
- */
-
-#ifndef LIBSERIALPORT_LIBSERIALPORT_H
-#define LIBSERIALPORT_LIBSERIALPORT_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stddef.h>
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-/* Package version macros (e.g. for conditional compilation). */
-#define SP_PACKAGE_VERSION_MAJOR @SP_PACKAGE_VERSION_MAJOR@
-#define SP_PACKAGE_VERSION_MINOR @SP_PACKAGE_VERSION_MINOR@
-#define SP_PACKAGE_VERSION_MICRO @SP_PACKAGE_VERSION_MICRO@
-#define SP_PACKAGE_VERSION_STRING "@SP_PACKAGE_VERSION@"
-
-/* Library/libtool version macros (e.g. for conditional compilation). */
-#define SP_LIB_VERSION_CURRENT @SP_LIB_VERSION_CURRENT@
-#define SP_LIB_VERSION_REVISION @SP_LIB_VERSION_REVISION@
-#define SP_LIB_VERSION_AGE @SP_LIB_VERSION_AGE@
-#define SP_LIB_VERSION_STRING "@SP_LIB_VERSION@"
-
-/** Return values. */
-enum sp_return {
- /** Operation completed successfully. */
- SP_OK = 0,
- /** Invalid arguments were passed to the function. */
- SP_ERR_ARG = -1,
- /** A system error occured while executing the operation. */
- SP_ERR_FAIL = -2,
- /** A memory allocation failed while executing the operation. */
- SP_ERR_MEM = -3,
- /** The requested operation is not supported by this system or device. */
- SP_ERR_SUPP = -4,
-};
-
-/** Port access modes. */
-enum sp_mode {
- /** Open port for read access. */
- SP_MODE_READ = 1,
- /** Open port for write access. */
- SP_MODE_WRITE = 2,
- /** Open port in non-blocking mode. */
- SP_MODE_NONBLOCK = 4,
-};
-
-/** Buffer selection. */
-enum sp_buffer {
- /** Input buffer. */
- SP_BUF_INPUT = 1,
- /** Output buffer. */
- SP_BUF_OUTPUT = 2,
- /** Both buffers. */
- SP_BUF_BOTH = 3,
-};
-
-/** Parity settings. */
-enum sp_parity {
- /** Special value to indicate setting should be left alone. */
- SP_PARITY_INVALID = -1,
- /** No parity. */
- SP_PARITY_NONE = 0,
- /** Odd parity. */
- SP_PARITY_ODD = 1,
- /** Even parity. */
- SP_PARITY_EVEN = 2,
-};
-
-/** RTS pin behaviour. */
-enum sp_rts {
- /** Special value to indicate setting should be left alone. */
- SP_RTS_INVALID = -1,
- /** RTS off. */
- SP_RTS_OFF = 0,
- /** RTS on. */
- SP_RTS_ON = 1,
- /** RTS used for flow control. */
- SP_RTS_FLOW_CONTROL = 2,
-};
-
-/** CTS pin behaviour. */
-enum sp_cts {
- /** Special value to indicate setting should be left alone. */
- SP_CTS_INVALID = -1,
- /** CTS ignored. */
- SP_CTS_IGNORE = 0,
- /** CTS used for flow control. */
- SP_CTS_FLOW_CONTROL = 1,
-};
-
-/** DTR pin behaviour. */
-enum sp_dtr {
- /** Special value to indicate setting should be left alone. */
- SP_DTR_INVALID = -1,
- /** DTR off. */
- SP_DTR_OFF = 0,
- /** DTR on. */
- SP_DTR_ON = 1,
- /** DTR used for flow control. */
- SP_DTR_FLOW_CONTROL = 2,
-};
-
-/** DSR pin behaviour. */
-enum sp_dsr {
- /** Special value to indicate setting should be left alone. */
- SP_DSR_INVALID = -1,
- /** DSR ignored. */
- SP_DSR_IGNORE = 0,
- /** DSR used for flow control. */
- SP_DSR_FLOW_CONTROL = 1,
-};
-
-/** XON/XOFF flow control behaviour. */
-enum sp_xonxoff {
- /** Special value to indicate setting should be left alone. */
- SP_XONXOFF_INVALID = -1,
- /** XON/XOFF disabled. */
- SP_XONXOFF_DISABLED = 0,
- /** XON/XOFF enabled for input only. */
- SP_XONXOFF_IN = 1,
- /** XON/XOFF enabled for output only. */
- SP_XONXOFF_OUT = 2,
- /** XON/XOFF enabled for input and output. */
- SP_XONXOFF_INOUT = 3,
-};
-
-/** Standard flow control combinations. */
-enum sp_flowcontrol {
- /** No flow control. */
- SP_FLOWCONTROL_NONE = 0,
- /** Software flow control using XON/XOFF characters. */
- SP_FLOWCONTROL_XONXOFF = 1,
- /** Hardware flow control using RTS/CTS signals. */
- SP_FLOWCONTROL_RTSCTS = 2,
- /** Hardware flow control using DTR/DSR signals. */
- SP_FLOWCONTROL_DTRDSR = 3,
-};
-
-/** Input signals. */
-enum sp_signal {
- /** Clear to send. */
- SP_SIG_CTS = 1,
- /** Data set ready. */
- SP_SIG_DSR = 2,
- /** Data carrier detect. */
- SP_SIG_DCD = 4,
- /** Ring indicator. */
- SP_SIG_RI = 8,
-};
-
-/** A serial port. */
-struct sp_port;
-
-/** Configuration for a serial port. */
-struct sp_port_config {
- /** Baud rate in bits per second. */
- int baudrate;
- /** Number of data bits to use. Valid values are 5 to 8. */
- int bits;
- /** Parity setting to use. */
- enum sp_parity parity;
- /** Number of stop bits to use (1 or 2). */
- int stopbits;
- /** RTS pin mode. */
- enum sp_rts rts;
- /** CTS pin mode. */
- enum sp_cts cts;
- /** DTR pin mode. */
- enum sp_dtr dtr;
- /** DSR pin mode. */
- enum sp_dsr dsr;
- /** XON/XOFF flow control mode. */
- enum sp_xonxoff xon_xoff;
-};
-
-/**
-@defgroup Enumeration Port enumeration
-@{
-*/
-
-/**
- * Obtain a pointer to a new sp_port structure representing the named port.
- *
- * The user should allocate a variable of type "struct sp_port *" and pass a
- * pointer to this to receive the result.
- *
- * The result should be freed after use by calling sp_free_port().
- *
- * If any error is returned, the variable pointed to by port_ptr will be set
- * to NULL. Otherwise, it will be set to point to the newly allocated port.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr);
-
-/**
- * Get the name of a port.
- *
- * The name returned is whatever is normally used to refer to a port on the
- * current operating system; e.g. for Windows it will usually be a "COMn"
- * device name, and for Unix it will be a device path beginning with "/dev/".
- *
- * @param port Pointer to port structure.
- *
- * @return The port name, or NULL if an invalid port is passed. The name
- * string is part of the port structure and may not be used after the
- * port structure has been freed.
- */
-char *sp_get_port_name(const struct sp_port *port);
-
-/**
- * Get the operating system handle for a port.
- *
- * The type of the handle depends on the operating system. On Unix based
- * systems, the handle is a file descriptor of type "int". On Windows, the
- * handle is of type "HANDLE". The user should allocate a variable of the
- * appropriate type and pass a pointer to this to receive the result.
- *
- * To obtain a valid handle, the port must first be opened by calling
- * sp_open() using the same port structure.
- *
- * After the port is closed or the port structure freed, the handle may
- * no longer be valid.
- *
- * @warning This feature is provided so that programs may make use of
- * OS-specific functionality where desired. Obviously this comes
- * at a cost in portability, however it also cannot be guaranteed
- * that direct usage of the OS handle will not conflict with the
- * library's own usage of the port. Be careful.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_get_port_handle(const struct sp_port *port, void *result);
-
-/**
- * Free a port structure obtained from sp_get_port_by_name() or sp_copy_port().
- */
-void sp_free_port(struct sp_port *port);
-
-/**
- * List the serial ports available on the system.
- *
- * The result obtained is an array of pointers to sp_port structures,
- * terminated by a NULL. The user should allocate a variable of type
- * "struct sp_port **" and pass a pointer to this to receive the result.
- *
- * The result should be freed after use by calling sp_free_port_list().
- * If a port from the list is to be used after freeing the list, it must be
- * copied first using sp_copy_port().
- *
- * If any error is returned, the variable pointed to by list_ptr will be set
- * to NULL. Otherwise, it will be set to point to the newly allocated array.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_list_ports(struct sp_port ***list_ptr);
-
-/**
- * Make a new copy of a sp_port structure.
- *
- * The user should allocate a variable of type "struct sp_port *" and pass a
- * pointer to this to receive the result.
- *
- * The copy should be freed after use by calling sp_free_port().
- *
- * If any error is returned, the variable pointed to by copy_ptr will be set
- * to NULL. Otherwise, it will be set to point to the newly allocated copy.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr);
-
-/**
- * Free a port list obtained from sp_list_ports().
- *
- * This will also free all the sp_port structures referred to from the list;
- * any that are to be retained must be copied first using sp_copy_port().
- */
-void sp_free_port_list(struct sp_port **ports);
-
-/**
- * @}
- * @defgroup Ports Opening and closing ports
- * @{
- */
-
-/**
- * Open the specified serial port.
- *
- * @param port Pointer to port structure.
- * @param flags Flags to use when opening the serial port.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_open(struct sp_port *port, enum sp_mode flags);
-
-/**
- * Close the specified serial port.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_close(struct sp_port *port);
-
-/**
- * @}
- * @defgroup Configuration Setting port parameters
- * @{
- */
-
-/**
- * Get the current configuration of the specified serial port.
- *
- * The user should allocate a struct sp_port_config, then pass a pointer to it
- * as the config parameter. The struct will be populated with the port
- * configuration.
- *
- * Any setting that is in a state not recognised or supported by
- * libserialport will have its value set to -1 in the struct.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config);
-
-/**
- * Set the configuration for the specified serial port.
- *
- * The user should populate a struct sp_port_config, then pass a pointer to it
- * as the config parameter.
- *
- * To retain the current value of any setting, set that field to -1.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config);
-
-/**
- * Set the baud rate for the specified serial port.
- *
- * @param port Pointer to port structure.
- * @param baudrate Baud rate in bits per second.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_baudrate(struct sp_port *port, int baudrate);
-
-/**
- * Set the number of data bits for the specified serial port.
- *
- * @param port Pointer to port structure.
- * @param bits Number of data bits to use. Valid values are 5 to 8.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_bits(struct sp_port *port, int bits);
-
-/**
- * Set the parity for the specified serial port.
- *
- * @param port Pointer to port structure.
- * @param parity Parity setting to use.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_parity(struct sp_port *port, enum sp_parity parity);
-
-/**
- * Set the number of stop bits for the specified port.
- *
- * @param port Pointer to port structure.
- * @param stopbits Number of stop bits to use (1 or 2).
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_stopbits(struct sp_port *port, int stopbits);
-
-/**
- * Set the flow control type for the specified serial port.
- *
- * This function is a wrapper that sets the RTS, CTS, DTR, DSR and
- * XON/XOFF settings as necessary for the specified flow control
- * type. For more fine-grained control of these settings, use their
- * individual configuration functions or the sp_set_config() function.
- *
- * @param port Pointer to port structure.
- * @param flowcontrol Flow control setting to use.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol);
-
-/**
- * Set the RTS pin behaviour for the specified port.
- *
- * @param port Pointer to port structure.
- * @param rts RTS pin mode.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_rts(struct sp_port *port, enum sp_rts rts);
-
-/**
- * Set the CTS pin behaviour for the specified port.
- *
- * @param port Pointer to port structure.
- * @param cts CTS pin mode.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_cts(struct sp_port *port, enum sp_cts cts);
-
-/**
- * Set the DTR pin behaviour for the specified port.
- *
- * @param port Pointer to port structure.
- * @param dtr DTR pin mode.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_dtr(struct sp_port *port, enum sp_dtr dtr);
-
-/**
- * Set the RTS pin behaviour for the specified port.
- *
- * @param port Pointer to port structure.
- * @param dsr DSR pin mode.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_dsr(struct sp_port *port, enum sp_dsr dsr);
-
-/**
- * Configure XON/XOFF flow control for the specified port.
- *
- * @param port Pointer to port structure.
- * @param xon_xoff XON/XOFF flow control mode.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_set_xon_xoff(struct sp_port *port, enum sp_xonxoff xon_xoff);
-
-/**
- * @}
- * @defgroup Data Reading, writing, and flushing data
- * @{
-*/
-
-/**
- * Read bytes from the specified serial port.
- *
- * Note that this function may return after reading less than the specified
- * number of bytes; it is the user's responsibility to iterate as necessary
- * in this case.
- *
- * @param port Pointer to port structure.
- * @param buf Buffer in which to store the bytes read.
- * @param count Maximum number of bytes to read.
- *
- * @return The number of bytes read on success, or a negative error code.
- */
-enum sp_return sp_read(struct sp_port *port, void *buf, size_t count);
-
-/**
- * Write bytes to the specified serial port.
- *
- * Note that this function may return after writing less than the specified
- * number of bytes; it is the user's responsibility to iterate as necessary
- * in this case.
- *
- * @param port Pointer to port structure.
- * @param buf Buffer containing the bytes to write.
- * @param count Maximum number of bytes to write.
- *
- * @return The number of bytes written on success, or a negative error code.
- */
-enum sp_return sp_write(struct sp_port *port, const void *buf, size_t count);
-
-/**
- * Flush serial port buffers. Data in the selected buffer(s) is discarded.
- *
- * @param port Pointer to port structure.
- * @param buffers Which buffer(s) to flush.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers);
-
-/**
- * Wait for buffered data to be transmitted.
- *
- * @param port Pointer to port structure.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_drain(struct sp_port *port);
-
-/**
- * @}
- * @defgroup Signal Port signalling operations
- * @{
- */
-
-/**
- * Gets the status of the control signals for the specified port.
- *
- * The user should allocate a variable of type "enum sp_signal" and pass a
- * pointer to this variable to receive the result. The result is a bitmask
- * in which individual signals can be checked by bitwise OR with values of
- * the sp_signal enum.
- *
- * @param port Pointer to port structure.
- * @param signals Pointer to variable to receive result.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signals);
-
-/**
- * Put the port transmit line into the break state.
- *
- * @param port Pointer to port structure.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_start_break(struct sp_port *port);
-
-/**
- * Take the port transmit line out of the break state.
- *
- * @param port Pointer to port structure.
- *
- * @return SP_OK upon success, a negative error code otherwise.
- */
-enum sp_return sp_end_break(struct sp_port *port);
-
-/**
- * @}
- * @defgroup Errors Obtaining error information
- * @{
-*/
-
-/**
- * Get the error code for a failed operation.
- *
- * In order to obtain the correct result, this function should be called
- * straight after the failure, before executing any other system operations.
- *
- * @return The system's numeric code for the error that caused the last
- * operation to fail.
- */
-int sp_last_error_code(void);
-
-/**
- * Get the error message for a failed operation.
- *
- * In order to obtain the correct result, this function should be called
- * straight after the failure, before executing other system operations.
- *
- * @return The system's message for the error that caused the last
- * operation to fail. This string may be allocated by the function,
- * and should be freed after use by calling sp_free_error_message().
- */
-char *sp_last_error_message(void);
-
-/**
- * Free an error message returned by sp_last_error_message().
- */
-void sp_free_error_message(char *message);
-
-/**
- * Set the handler function for library debugging messages.
- *
- * Debugging messages are generated by the library during each operation,
- * to help in diagnosing problems. The handler will be called for each
- * message. The handler can be set to NULL to ignore all debug messages.
- *
- * The handler function should accept a format string and variable length
- * argument list, in the same manner as e.g. printf().
- *
- * The default handler is sp_default_debug_handler().
- */
-void sp_set_debug_handler(void (*handler)(const char *format, ...));
-
-/**
- * Default handler function for library debugging messages.
- *
- * This function prints debug messages to the standard error stream if the
- * environment variable LIBSERIALPORT_DEBUG is set. Otherwise, they are
- * ignored.
- */
-void sp_default_debug_handler(const char *format, ...);
-
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
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