X-Git-Url: https://sigrok.org/gitweb/?p=libserialport.git;a=blobdiff_plain;f=libserialport.h.in;h=8962ef8d942eb5fb6f368408b62feea9998a2a97;hp=3d38a0dc3302b98a456cb1da007c684cd3ffe7a1;hb=HEAD;hpb=3353c22f326c0b5d2db4360b70554b2f00f94cf7 diff --git a/libserialport.h.in b/libserialport.h.in deleted file mode 100644 index 3d38a0d..0000000 --- a/libserialport.h.in +++ /dev/null @@ -1,969 +0,0 @@ -/* - * This file is part of the libserialport project. - * - * Copyright (C) 2013 Martin Ling - * - * 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 . - */ - -/** - * @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 Signals (modem control lines, breaks, 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. - * - * Most functions have return type @ref sp_return and 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. - * - * Calls that succeed return @ref SP_OK, which is equal to zero. Some functions - * declared @ref sp_return can also return a positive value for a successful - * numeric result, e.g. sp_read() and sp_write(). - */ - -#ifndef LIBSERIALPORT_LIBSERIALPORT_H -#define LIBSERIALPORT_LIBSERIALPORT_H - -#ifdef __cplusplus -extern "C" { -#endif - -#include -#ifdef _WIN32 -#include -#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, -}; - -/** 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, - /** Mark parity. */ - SP_PARITY_MARK = 3, - /** Space parity. */ - SP_PARITY_SPACE = 4, -}; - -/** 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; - -/** -@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); - -/** - * 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, closing and querying 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); - -/** - * 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. Doing so obviously - * comes at a cost in portability. 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_ptr); - -/** - * @} - * @defgroup Configuration Setting port parameters - * @{ - */ - -/** - * Allocate a port configuration structure. - * - * The user should allocate a variable of type "struct sp_config *" and pass a - * pointer to this to receive the result. The variable will be updated to - * point to the new configuration structure. The structure is opaque and must - * be accessed via the functions provided. - * - * All parameters in the structure will be initialised to special values which - * are ignored by sp_set_config(). - * - * The structure should be freed after use by calling sp_free_config(). - * - * @param config_ptr Pointer to variable to receive result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_new_config(struct sp_port_config **config_ptr); - -/** - * Free a port configuration structure. - * - * @param config Pointer to configuration structure. - */ -void sp_free_config(struct sp_port_config *config); - -/** - * Get the current configuration of the specified serial port. - * - * The user should allocate a configuration structure using sp_new_config() - * and pass this as the config parameter. The configuration structure will - * be updated with the port configuration. - * - * Any parameters that are configured with settings not recognised or - * supported by libserialport, will be set to special values that are - * ignored by sp_set_config(). - * - * @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. - * - * For each parameter in the configuration, there is a special value (usually - * -1, but see the documentation for each field). These values will be ignored - * and the corresponding setting left unchanged on the port. - * - * @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); - -/** - * Get the baud rate from a port configuration. - * - * The user should allocate a variable of type int and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param baudrate_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_baudrate(const struct sp_port_config *config, int *baudrate_ptr); - -/** - * Set the baud rate in a port configuration. - * - * @param config Pointer to configuration structure. - * @param baudrate Baud rate in bits per second, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_baudrate(struct sp_port_config *config, int baudrate); - -/** - * Set the data bits for the specified serial port. - * - * @param port Pointer to port structure. - * @param bits Number of data bits. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_bits(struct sp_port *port, int bits); - -/** - * Get the data bits from a port configuration. - * - * The user should allocate a variable of type int and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param bits_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_bits(const struct sp_port_config *config, int *bits_ptr); - -/** - * Set the data bits in a port configuration. - * - * @param config Pointer to configuration structure. - * @param bits Number of data bits, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_bits(struct sp_port_config *config, int bits); - -/** - * Set the parity setting for the specified serial port. - * - * @param port Pointer to port structure. - * @param parity Parity setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_parity(struct sp_port *port, enum sp_parity parity); - -/** - * Get the parity setting from a port configuration. - * - * The user should allocate a variable of type enum sp_parity and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param parity_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_parity(const struct sp_port_config *config, enum sp_parity *parity_ptr); - -/** - * Set the parity setting in a port configuration. - * - * @param config Pointer to configuration structure. - * @param parity Parity setting, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_parity(struct sp_port_config *config, enum sp_parity parity); - -/** - * Set the stop bits for the specified serial port. - * - * @param port Pointer to port structure. - * @param stopbits Number of stop bits. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_stopbits(struct sp_port *port, int stopbits); - -/** - * Get the stop bits from a port configuration. - * - * The user should allocate a variable of type int and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param stopbits_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_stopbits(const struct sp_port_config *config, int *stopbits_ptr); - -/** - * Set the stop bits in a port configuration. - * - * @param config Pointer to configuration structure. - * @param stopbits Number of stop bits, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_stopbits(struct sp_port_config *config, int stopbits); - -/** - * Set the RTS pin behaviour for the specified serial 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); - -/** - * Get the RTS pin behaviour from a port configuration. - * - * The user should allocate a variable of type enum sp_rts and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param rts_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_rts(const struct sp_port_config *config, enum sp_rts *rts_ptr); - -/** - * Set the RTS pin behaviour in a port configuration. - * - * @param config Pointer to configuration structure. - * @param rts RTS pin mode, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_rts(struct sp_port_config *config, enum sp_rts rts); - -/** - * Set the CTS pin behaviour for the specified serial 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); - -/** - * Get the CTS pin behaviour from a port configuration. - * - * The user should allocate a variable of type enum sp_cts and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param cts_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_cts(const struct sp_port_config *config, enum sp_cts *cts_ptr); - -/** - * Set the CTS pin behaviour in a port configuration. - * - * @param config Pointer to configuration structure. - * @param cts CTS pin mode, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_cts(struct sp_port_config *config, enum sp_cts cts); - -/** - * Set the DTR pin behaviour for the specified serial 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); - -/** - * Get the DTR pin behaviour from a port configuration. - * - * The user should allocate a variable of type enum sp_dtr and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param dtr_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_dtr(const struct sp_port_config *config, enum sp_dtr *dtr_ptr); - -/** - * Set the DTR pin behaviour in a port configuration. - * - * @param config Pointer to configuration structure. - * @param dtr DTR pin mode, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_dtr(struct sp_port_config *config, enum sp_dtr dtr); - -/** - * Set the DSR pin behaviour for the specified serial 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); - -/** - * Get the DSR pin behaviour from a port configuration. - * - * The user should allocate a variable of type enum sp_dsr and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param dsr_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_dsr(const struct sp_port_config *config, enum sp_dsr *dsr_ptr); - -/** - * Set the DSR pin behaviour in a port configuration. - * - * @param config Pointer to configuration structure. - * @param dsr DSR pin mode, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_dsr(struct sp_port_config *config, enum sp_dsr dsr); - -/** - * Set the XON/XOFF configuration for the specified serial port. - * - * @param port Pointer to port structure. - * @param xon_xoff XON/XOFF 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); - -/** - * Get the XON/XOFF configuration from a port configuration. - * - * The user should allocate a variable of type enum sp_xonxoff and pass a pointer to this - * to receive the result. - * - * @param config Pointer to configuration structure. - * @param xon_xoff_ptr Pointer to variable to store result. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_get_config_xon_xoff(const struct sp_port_config *config, enum sp_xonxoff *xon_xoff_ptr); - -/** - * Set the XON/XOFF configuration in a port configuration. - * - * @param config Pointer to configuration structure. - * @param xon_xoff XON/XOFF mode, or -1 to retain current setting. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_xon_xoff(struct sp_port_config *config, enum sp_xonxoff xon_xoff); - -/** - * Set the flow control type in a port configuration. - * - * 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. - * - * @param config Pointer to configuration structure. - * @param flowcontrol Flow control setting to use. - * - * @return SP_OK upon success, a negative error code otherwise. - */ -enum sp_return sp_set_config_flowcontrol(struct sp_port_config *config, enum sp_flowcontrol flowcontrol); - -/** - * 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. - * - * @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); - -/** - * @} - * @defgroup Data Reading, writing, and flushing data - * @{ -*/ - -/** - * Read bytes from the specified serial port, blocking until available. - * - * @param port Pointer to port structure. - * @param buf Buffer in which to store the bytes read. - * @param count Requested number of bytes to read. - * @param timeout Timeout in milliseconds, or zero to wait indefinitely. - * - * @return The number of bytes read on success, or a negative error code. If - * the number of bytes returned is less than that requested, the - * timeout was reached before the requested number of bytes was - * available. If timeout is zero, the function will always return - * either the requested number of bytes or a negative error code. - */ -enum sp_return sp_blocking_read(struct sp_port *port, void *buf, size_t count, unsigned int timeout); - -/** - * Read bytes from the specified serial port, without blocking. - * - * @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. The - * number of bytes returned may be any number from zero to the maximum - * that was requested. - */ -enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf, size_t count); - -/** - * Write bytes to the specified serial port, blocking until complete. - * - * Note that this function only ensures that the accepted bytes have been - * written to the OS; they may be held in driver or hardware buffers and not - * yet physically transmitted. To check whether all written bytes have actually - * been transmitted, use the sp_output_waiting() function. To wait until all - * written bytes have actually been transmitted, use the sp_drain() function. - * - * @param port Pointer to port structure. - * @param buf Buffer containing the bytes to write. - * @param count Requested number of bytes to write. - * @param timeout Timeout in milliseconds, or zero to wait indefinitely. - * - * @return The number of bytes read on success, or a negative error code. If - * the number of bytes returned is less than that requested, the - * timeout was reached before the requested number of bytes was - * sent. If timeout is zero, the function will always return - * either the requested number of bytes or a negative error code. In - * the event of an error there is no way to determine how many bytes - * were sent before the error occured. - */ -enum sp_return sp_blocking_write(struct sp_port *port, const void *buf, size_t count, unsigned int timeout); - -/** - * Write bytes to the specified serial port, without blocking. - * - * Note that this function only ensures that the accepted bytes have been - * written to the OS; they may be held in driver or hardware buffers and not - * yet physically transmitted. To check whether all written bytes have actually - * been transmitted, use the sp_output_waiting() function. To wait until all - * written bytes have actually been transmitted, use the sp_drain() function. - * - * @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. - * The number of bytes returned may be any number from zero to the - * maximum that was requested. - */ -enum sp_return sp_nonblocking_write(struct sp_port *port, const void *buf, size_t count); - -/** - * Gets the number of bytes waiting in the input buffer. - * - * @param port Pointer to port structure. - * - * @return Number of bytes waiting on success, a negative error code otherwise. - */ -enum sp_return sp_input_waiting(struct sp_port *port); - -/** - * Gets the number of bytes waiting in the output buffer. - * - * @param port Pointer to port structure. - * - * @return Number of bytes waiting on success, a negative error code otherwise. - */ -enum sp_return sp_output_waiting(struct sp_port *port); - -/** - * 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 Signals 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