*/
/**
- *
* @mainpage libserialport API
*
* Introduction
* - @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 Waiting
* - @ref Errors
*
* libserialport is an open source project released under the LGPL3+ license.
* 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 three possible error values. @ref SP_ERR_ARG
- * indicates the function was called with invalid arguments. @ref SP_ERR_FAIL
- * indicates that the OS reported a failure. @ref SP_ERR_MEM indicates that a
- * memory allocation failed. All of these error values are negative.
+ * Most functions have return type @ref sp_return and can return only four
+ * possible error values:
*
- * When @ref SP_ERR_FAIL is returned, an error code or string description of
- * the error can be obtained by calling sp_last_error_code() or
- * sp_last_error_message(). The error code or message is that provided by the
- * OS; libserialport does not define any error codes or messages of its own.
+ * - @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.
*
- * Function calls that succeed return @ref SP_OK, which is equal to zero,
- * or where otherwise documented a positive value.
+ * - @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_blocking_read() or sp_blocking_write().
*/
#ifndef LIBSERIALPORT_LIBSERIALPORT_H
#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_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_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. */
/** 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,
+ SP_MODE_WRITE = 2
+};
+
+/** Port events. */
+enum sp_event {
+ /* Data received and ready to read. */
+ SP_EVENT_RX_READY = 1,
+ /* Ready to transmit new data. */
+ SP_EVENT_TX_READY = 2,
+ /* Error occured. */
+ SP_EVENT_ERROR = 4
};
/** Buffer selection. */
/** Output buffer. */
SP_BUF_OUTPUT = 2,
/** Both buffers. */
- SP_BUF_BOTH = 3,
+ SP_BUF_BOTH = 3
};
/** Parity settings. */
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. */
/** RTS on. */
SP_RTS_ON = 1,
/** RTS used for flow control. */
- SP_RTS_FLOW_CONTROL = 2,
+ SP_RTS_FLOW_CONTROL = 2
};
/** CTS pin behaviour. */
/** CTS ignored. */
SP_CTS_IGNORE = 0,
/** CTS used for flow control. */
- SP_CTS_FLOW_CONTROL = 1,
+ SP_CTS_FLOW_CONTROL = 1
};
/** DTR pin behaviour. */
/** DTR on. */
SP_DTR_ON = 1,
/** DTR used for flow control. */
- SP_DTR_FLOW_CONTROL = 2,
+ SP_DTR_FLOW_CONTROL = 2
};
/** DSR pin behaviour. */
/** DSR ignored. */
SP_DSR_IGNORE = 0,
/** DSR used for flow control. */
- SP_DSR_FLOW_CONTROL = 1,
+ SP_DSR_FLOW_CONTROL = 1
};
/** XON/XOFF flow control behaviour. */
/** XON/XOFF enabled for output only. */
SP_XONXOFF_OUT = 2,
/** XON/XOFF enabled for input and output. */
- SP_XONXOFF_INOUT = 3,
+ SP_XONXOFF_INOUT = 3
};
/** Standard flow control combinations. */
/** Hardware flow control using RTS/CTS signals. */
SP_FLOWCONTROL_RTSCTS = 2,
/** Hardware flow control using DTR/DSR signals. */
- SP_FLOWCONTROL_DTRDSR = 3,
+ SP_FLOWCONTROL_DTRDSR = 3
};
/** Input signals. */
/** Data carrier detect. */
SP_SIG_DCD = 4,
/** Ring indicator. */
- SP_SIG_RI = 8,
+ SP_SIG_RI = 8
};
-/** A serial port. */
-struct sp_port {
- /** Name used to open the port. */
- char *name;
-/** @cond 0 */
- /** OS-specific port handle. */
-#ifdef _WIN32
- HANDLE hdl;
-#else
- int fd;
-#endif
-/** @endcond */
+/** Transport types. */
+enum sp_transport {
+ /** Native platform serial port. */
+ SP_TRANSPORT_NATIVE,
+ /** USB serial port adapter. */
+ SP_TRANSPORT_USB,
+ /** Bluetooh serial port adapter. */
+ SP_TRANSPORT_BLUETOOTH
};
-/** 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;
+/**
+ * @struct sp_port
+ * An opaque structure representing a serial port.
+ */
+struct sp_port;
+
+/**
+ * @struct sp_port_config
+ * An opaque structure representing the configuration for a serial port.
+ */
+struct sp_port_config;
+
+/**
+ * @struct sp_event_set
+ * A set of handles to wait on for events.
+ */
+struct sp_event_set {
+ /** Array of OS-specific handles. */
+ void *handles;
+ /** Array of bitmasks indicating which events apply for each handle. */
+ enum sp_event *masks;
+ /** Number of handles. */
+ unsigned int count;
};
/**
*
* The result should be freed after use by calling sp_free_port().
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation
- * failure, or SP_ERR_ARG if an invalid pointer is passed. 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.
+ * 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.
+ *
+ * @since 0.1.0
*/
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().
+ *
+ * @since 0.1.0
*/
void sp_free_port(struct sp_port *port);
* If a port from the list is to be used after freeing the list, it must be
* copied first using sp_copy_port().
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation
- * failure, or SP_ERR_ARG if an invalid pointer is passed. 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.
+ * 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.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_list_ports(struct sp_port ***list_ptr);
*
* The copy should be freed after use by calling sp_free_port().
*
- * @return SP_OK on success, SP_ERR_MEM on allocation failure, or SP_ERR_ARG
- * if an invalid port or pointer is passed. 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.
+ * 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.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr);
*
* 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().
+ *
+ * @since 0.1.0
*/
void sp_free_port_list(struct sp_port **ports);
/**
* @}
- * @defgroup Ports Opening and closing ports
+ * @defgroup Ports Opening, closing and querying ports
* @{
*/
* @param port Pointer to port structure.
* @param flags Flags to use when opening the serial port.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, SP_ERR_MEM on allocation
- * failure, or SP_ERR_ARG if an invalid port is passed.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_open(struct sp_port *port, enum sp_mode flags);
/**
* Close the specified serial port.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an invalid port is passed.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
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.
+ *
+ * @since 0.1.0
+ */
+char *sp_get_port_name(const struct sp_port *port);
+
+/**
+ * Get a description for a port, to present to end user.
+ *
+ * @param port Pointer to port structure.
+ *
+ * @return The port description, or NULL if an invalid port is passed.
+ * The description string is part of the port structure and may not be used
+ * after the port structure has been freed.
+ *
+ * @since 0.2.0
+ */
+char *sp_get_port_description(struct sp_port *port);
+
+/**
+ * Get the transport type used by a port.
+ *
+ * @param port Pointer to port structure.
+ *
+ * @return The port transport type.
+ *
+ * @since 0.2.0
+ */
+enum sp_transport sp_get_port_transport(struct sp_port *port);
+
+/**
+ * Get the USB bus number and address on bus of a USB serial adapter port.
+ *
+ * @param port Pointer to port structure.
+ * @param usb_bus Pointer to variable to store USB bus.
+ * @param usb_address Pointer to variable to store USB address
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.2.0
+ */
+enum sp_return sp_get_port_usb_bus_address(const struct sp_port *port,
+ int *usb_bus, int *usb_address);
+
+/**
+ * Get the USB Vendor ID and Product ID of a USB serial adapter port.
+ *
+ * @param port Pointer to port structure.
+ * @param usb_vid Pointer to variable to store USB VID.
+ * @param usb_pid Pointer to variable to store USB PID
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.2.0
+ */
+enum sp_return sp_get_port_usb_vid_pid(const struct sp_port *port, int *usb_vid, int *usb_pid);
+
+/**
+ * Get the USB manufacturer string of a USB serial adapter port.
+ *
+ * @param port Pointer to port structure.
+ *
+ * @return The port manufacturer string, or NULL if an invalid port is passed.
+ * The manufacturer string is part of the port structure and may not be used
+ * after the port structure has been freed.
+ *
+ * @since 0.2.0
+ */
+char *sp_get_port_usb_manufacturer(const struct sp_port *port);
+
+/**
+ * Get the USB product string of a USB serial adapter port.
+ *
+ * @param port Pointer to port structure.
+ *
+ * @return The port product string, or NULL if an invalid port is passed.
+ * The product string is part of the port structure and may not be used
+ * after the port structure has been freed.
+ *
+ * @since 0.2.0
+ */
+char *sp_get_port_usb_product(const struct sp_port *port);
+
+/**
+ * Get the USB serial number string of a USB serial adapter port.
+ *
+ * @param port Pointer to port structure.
+ *
+ * @return The port serial number, or NULL if an invalid port is passed.
+ * The serial number string is part of the port structure and may not be used
+ * after the port structure has been freed.
+ *
+ * @since 0.2.0
+ */
+char *sp_get_port_usb_serial(const struct sp_port *port);
+
+/**
+ * Get the MAC address of a Bluetooth serial adapter port.
+ *
+ * @param port Pointer to port structure.
+ *
+ * @return The port MAC address, or NULL if an invalid port is passed.
+ * The MAC address string is part of the port structure and may not be used
+ * after the port structure has been freed.
+ *
+ * @since 0.2.0
+ */
+char *sp_get_port_bluetooth_address(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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+enum sp_return sp_new_config(struct sp_port_config **config_ptr);
+
+/**
+ * Free a port configuration structure.
+ *
+ * @param config Pointer to configuration structure.
+ *
+ * @since 0.1.0
+ */
+void sp_free_config(struct sp_port_config *config);
+
/**
* 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.
+ * 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().
*
- * 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.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @since 0.1.0
*/
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.
+ * 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.
*
- * To retain the current value of any setting, set that field to -1.
+ * @return SP_OK upon success, a negative error code otherwise.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @since 0.1.0
*/
enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config);
* @param port Pointer to port structure.
* @param baudrate Baud rate in bits per second.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_set_baudrate(struct sp_port *port, int baudrate);
/**
- * Set the number of data bits for the specified serial port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 to use. Valid values are 5 to 8.
+ * @param bits Number of data bits.
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @since 0.1.0
*/
enum sp_return sp_set_bits(struct sp_port *port, int bits);
/**
- * Set the parity for the specified serial port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 to use.
+ * @param parity Parity setting.
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @since 0.1.0
*/
enum sp_return sp_set_parity(struct sp_port *port, enum sp_parity parity);
/**
- * Set the number of stop bits for the specified port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 to use (1 or 2).
+ * @param stopbits Number of stop bits.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_set_stopbits(struct sp_port *port, int stopbits);
/**
- * Set the flow control type for the specified serial port.
+ * Get the stop bits from 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 or the sp_set_config() function.
+ * The user should allocate a variable of type int and pass a pointer to this
+ * to receive the result.
*
- * @param port Pointer to port structure.
- * @param flowcontrol Flow control setting to use.
+ * @param config Pointer to configuration structure.
+ * @param stopbits_ptr Pointer to variable to store result.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
-enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flowcontrol);
+enum sp_return sp_get_config_stopbits(const struct sp_port_config *config, int *stopbits_ptr);
/**
- * Set the RTS pin behaviour for the specified port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_set_rts(struct sp_port *port, enum sp_rts rts);
/**
- * Set the CTS pin behaviour for the specified port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_set_cts(struct sp_port *port, enum sp_cts cts);
/**
- * Set the DTR pin behaviour for the specified port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_set_dtr(struct sp_port *port, enum sp_dtr dtr);
/**
- * Set the RTS pin behaviour for the specified port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_set_dsr(struct sp_port *port, enum sp_dsr dsr);
/**
- * Configure XON/XOFF flow control for the specified port.
+ * 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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 flow control mode.
+ * @param xon_xoff XON/XOFF mode.
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @since 0.1.0
*/
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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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.
+ * Read bytes from the specified serial port, blocking until complete.
+ *
+ * @warning If your program runs on Unix, defines its own signal handlers, and
+ * needs to abort blocking reads when these are called, then you
+ * should not use this function. It repeats system calls that return
+ * with EINTR. To be able to abort a read from a signal handler, you
+ * should implement your own blocking read using sp_nonblocking_read()
+ * together with a blocking method that makes sense for your program.
+ * E.g. you can obtain the file descriptor for an open port using
+ * sp_get_port_handle() and use this to call select() or pselect(),
+ * with appropriate arrangements to return if a signal is received.
*
- * 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 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.
+ *
+ * @since 0.1.0
+ */
+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, SP_ERR_FAIL on failure,
- * or SP_ERR_ARG for invalid arguments.
+ * @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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @warning If your program runs on Unix, defines its own signal handlers, and
+ * needs to abort blocking writes when these are called, then you
+ * should not use this function. It repeats system calls that return
+ * with EINTR. To be able to abort a write from a signal handler, you
+ * should implement your own blocking write using sp_nonblocking_write()
+ * together with a blocking method that makes sense for your program.
+ * E.g. you can obtain the file descriptor for an open port using
+ * sp_get_port_handle() and use this to call select() or pselect(),
+ * with appropriate arrangements to return if a signal is received.
+ *
+ * @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 written 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
+ * written. 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.
+ *
+ * @since 0.1.0
*/
-enum sp_return sp_read(struct sp_port *port, void *buf, size_t count);
+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.
+ * Write bytes to the specified serial port, without blocking.
*
- * 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.
+ * 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, SP_ERR_FAIL on failure,
- * or SP_ERR_ARG for invalid arguments.
+ * @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.
+ *
+ * @since 0.1.0
*/
-enum sp_return sp_write(struct sp_port *port, const void *buf, size_t count);
+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.
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an invalid port is passed.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers);
/**
* Wait for buffered data to be transmitted.
*
+ * @warning If your program runs on Unix, defines its own signal handlers, and
+ * needs to abort draining the output buffer when when these are
+ * called, then you should not use this function. It repeats system
+ * calls that return with EINTR. To be able to abort a drain from a
+ * signal handler, you would need to implement your own blocking
+ * drain by polling the result of sp_output_waiting().
+ *
* @param port Pointer to port structure.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an invalid port is passed.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_drain(struct sp_port *port);
/**
* @}
- * @defgroup Signal Port signalling operations
+ * @defgroup Waiting Waiting for events
+ * @{
+ */
+
+/**
+ * Allocate storage for a set of events.
+ *
+ * The user should allocate a variable of type struct sp_event_set *,
+ * then pass a pointer to this variable to receive the result.
+ *
+ * The result should be freed after use by calling sp_free_event_set().
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
+ */
+enum sp_return sp_new_event_set(struct sp_event_set **result_ptr);
+
+/**
+ * Add events to a struct sp_event_set for a given port.
+ *
+ * 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 results may
+ * no longer be valid.
+ *
+ * @param event_set Event set to update.
+ * @param port Pointer to port structure.
+ * @param mask Bitmask of events to be waited for.
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
+ */
+enum sp_return sp_add_port_events(struct sp_event_set *event_set,
+ const struct sp_port *port, enum sp_event mask);
+
+/**
+ * Wait for any of a set of events to occur.
+ *
+ * @param event_set Event set to wait on.
+ * @param timeout Timeout in milliseconds, or zero to wait indefinitely.
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
+ */
+enum sp_return sp_wait(struct sp_event_set *event_set, unsigned int timeout);
+
+/**
+ * Free a structure allocated by sp_new_event_set().
+ *
+ * @since 0.1.0
+ */
+void sp_free_event_set(struct sp_event_set *event_set);
+
+/**
+ * @}
+ * @defgroup Signals Port signalling operations
* @{
*/
* the sp_signal enum.
*
* @param port Pointer to port structure.
- * @param signals Pointer to variable to receive result.
+ * @param signal_mask Pointer to variable to receive result.
+ *
+ * @return SP_OK upon success, a negative error code otherwise.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an an invalid port or pointer is passed.
+ * @since 0.1.0
*/
-enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signals);
+enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signal_mask);
/**
* Put the port transmit line into the break state.
*
* @param port Pointer to port structure.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an invalid port is passed.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_start_break(struct sp_port *port);
*
* @param port Pointer to port structure.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an invalid port is passed.
+ * @return SP_OK upon success, a negative error code otherwise.
+ *
+ * @since 0.1.0
*/
enum sp_return sp_end_break(struct sp_port *port);
*
* @return The system's numeric code for the error that caused the last
* operation to fail.
+ *
+ * @since 0.1.0
*/
int sp_last_error_code(void);
* @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().
+ *
+ * @since 0.1.0
*/
char *sp_last_error_message(void);
/**
* Free an error message returned by sp_last_error_message().
+ *
+ * @since 0.1.0
*/
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().
+ *
+ * @since 0.1.0
+ */
+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.
+ *
+ * @since 0.1.0
+ */
+void sp_default_debug_handler(const char *format, ...);
+
+/** @} */
+
+/**
+ * @defgroup Versions Version number querying functions, definitions, and macros
+ *
+ * This set of API calls returns two different version numbers related
+ * to libserialport. The "package version" is the release version number of the
+ * libserialport tarball in the usual "major.minor.micro" format, e.g. "0.1.0".
+ *
+ * The "library version" is independent of that; it is the libtool version
+ * number in the "current:revision:age" format, e.g. "2:0:0".
+ * See http://www.gnu.org/software/libtool/manual/libtool.html#Libtool-versioning for details.
+ *
+ * Both version numbers (and/or individual components of them) can be
+ * retrieved via the API calls at runtime, and/or they can be checked at
+ * compile/preprocessor time using the respective macros.
+ *
+ * @{
+ */
+
+/*
+ * Package version macros (can be used for conditional compilation).
+ */
+
+/** The libserialport package 'major' version number. */
+#define SP_PACKAGE_VERSION_MAJOR @SP_PACKAGE_VERSION_MAJOR@
+
+/** The libserialport package 'minor' version number. */
+#define SP_PACKAGE_VERSION_MINOR @SP_PACKAGE_VERSION_MINOR@
+
+/** The libserialport package 'micro' version number. */
+#define SP_PACKAGE_VERSION_MICRO @SP_PACKAGE_VERSION_MICRO@
+
+/** The libserialport package version ("major.minor.micro") as string. */
+#define SP_PACKAGE_VERSION_STRING "@SP_PACKAGE_VERSION@"
+
+/*
+ * Library/libtool version macros (can be used for conditional compilation).
+ */
+
+/** The libserialport libtool 'current' version number. */
+#define SP_LIB_VERSION_CURRENT @SP_LIB_VERSION_CURRENT@
+
+/** The libserialport libtool 'revision' version number. */
+#define SP_LIB_VERSION_REVISION @SP_LIB_VERSION_REVISION@
+
+/** The libserialport libtool 'age' version number. */
+#define SP_LIB_VERSION_AGE @SP_LIB_VERSION_AGE@
+
+/** The libserialport libtool version ("current:revision:age") as string. */
+#define SP_LIB_VERSION_STRING "@SP_LIB_VERSION@"
+
+/**
+ * Get the major libserialport package version number.
+ *
+ * @return The major package version number.
+ *
+ * @since 0.1.0
+ */
+int sp_get_major_package_version(void);
+
+/**
+ * Get the minor libserialport package version number.
+ *
+ * @return The minor package version number.
+ *
+ * @since 0.1.0
+ */
+int sp_get_minor_package_version(void);
+
+/**
+ * Get the micro libserialport package version number.
+ *
+ * @return The micro package version number.
+ *
+ * @since 0.1.0
+ */
+int sp_get_micro_package_version(void);
+
+/**
+ * Get the libserialport package version number as a string.
+ *
+ * @return The package version number string. The returned string is
+ * static and thus should NOT be free'd by the caller.
+ *
+ * @since 0.1.0
+ */
+const char *sp_get_package_version_string(void);
+
+/**
+ * Get the "current" part of the libserialport library version number.
+ *
+ * @return The "current" library version number.
+ *
+ * @since 0.1.0
+ */
+int sp_get_current_lib_version(void);
+
+/**
+ * Get the "revision" part of the libserialport library version number.
+ *
+ * @return The "revision" library version number.
+ *
+ * @since 0.1.0
+ */
+int sp_get_revision_lib_version(void);
+
+/**
+ * Get the "age" part of the libserialport library version number.
+ *
+ * @return The "age" library version number.
+ *
+ * @since 0.1.0
+ */
+int sp_get_age_lib_version(void);
+
+/**
+ * Get the libserialport library version number as a string.
+ *
+ * @return The library version number string. The returned string is
+ * static and thus should NOT be free'd by the caller.
+ *
+ * @since 0.1.0
+ */
+const char *sp_get_lib_version_string(void);
+
/** @} */
#ifdef __cplusplus
projects / libserialport.git / blobdiff