*/
/**
+ * @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.
+ */
-\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 three possible error values. SP_ERR_ARG indicates
-the function was called with invalid arguments. SP_ERR_FAIL indicates that the
-OS reported a failure. SP_ERR_MEM indicates that a memory allocation failed.
-All of these error values are negative.
-
-When 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.
-
-Function calls that succeed return SP_OK, which is equal to zero, or where
-otherwise documented a positive value.
-
-*/
-
-#ifndef LIBSERIALPORT_H
-#define LIBSERIALPORT_H
+#ifndef LIBSERIALPORT_LIBSERIALPORT_H
+#define LIBSERIALPORT_LIBSERIALPORT_H
#ifdef __cplusplus
extern "C" {
/* 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). */
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/write access. */
- SP_MODE_RDWR = 1,
- /** Open port for read access only. */
- SP_MODE_RDONLY = 2,
+ /** 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,
- /** Even parity. */
- SP_PARITY_EVEN = 1,
/** Odd parity. */
- SP_PARITY_ODD = 2,
+ SP_PARITY_ODD = 1,
+ /** Even parity. */
+ SP_PARITY_EVEN = 2,
};
/** 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,
};
-/** 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 */
+/** 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. */
};
/**
-\defgroup Enumeration Port enumeration
+@defgroup Enumeration Port enumeration
@{
*/
/**
- Obtains 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().
-
- @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.
-*/
+ * 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);
/**
-Frees a port structure obtained from sp_get_port_by_name() or sp_copy_port().
-*/
-void sp_free_port(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);
/**
- Lists 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.
+ * 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);
- 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().
+/**
+ * Free a port structure obtained from sp_get_port_by_name() or sp_copy_port().
+ */
+void sp_free_port(struct sp_port *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.
-*/
+/**
+ * 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);
/**
- Makes 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().
-
- @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.
-*/
+ * 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);
/**
- Frees 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().
-*/
+ * 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 ports
-@{
-*/
+ * @}
+ * @defgroup Ports Opening and closing ports
+ * @{
+ */
/**
- Opens the specified serial port.
-
- @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.
-*/
+ * 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);
/**
- Closes the specified serial port.
-
- @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- if an invalid port is passed.
-*/
+ * 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
-@{
-*/
+ * @}
+ * @defgroup Configuration Setting port parameters
+ * @{
+ */
/**
- Gets 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets the parity for the specified serial port.
-
- @param port Pointer to port structure.
- @param parity Parity setting to use.
-
- @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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);
/**
- Sets the RTS pin behaviour for the specified 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.
-*/
+ * 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);
/**
- Sets the CTS pin behaviour for the specified 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.
-*/
+ * 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);
/**
- Sets the DTR pin behaviour for the specified 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.
-*/
+ * 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);
/**
- Sets the RTS pin behaviour for the specified 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.
-*/
+ * 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);
/**
- Configures 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- for invalid arguments.
-*/
+ * 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 & flushing data
-@{
+ * @}
+ * @defgroup Data Reading, writing, and flushing data
+ * @{
*/
/**
- Reads 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, SP_ERR_FAIL on failure,
- or SP_ERR_ARG for invalid arguments.
-*/
+ * 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, SP_ERR_FAIL on failure,
- or SP_ERR_ARG for invalid arguments.
-*/
+ * 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);
/**
- Flushes serial port buffers.
+ * 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);
- @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- if an invalid port is passed.
-*/
-enum sp_return sp_flush(struct sp_port *port);
+/**
+ * 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 Errors Obtaining error information
-@{
-*/
+ * @}
+ * @defgroup Signal Port signalling operations
+ * @{
+ */
/**
- Gets the error code for a failed operation.
+ * 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);
- In order to obtain the correct result, this function should be called
- straight after the failure, before executing any other system operations.
+/**
+ * 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);
- @return The system's numeric code for the error that caused the last
- operation to fail.
-*/
-int sp_last_error_code(void);
+/**
+ * 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);
/**
- Gets the error message for a failed operation.
+ * @}
+ * @defgroup Errors Obtaining error information
+ * @{
+*/
- In order to obtain the correct result, this function should be called
- straight after the failure, before executing other system operations.
+/**
+ * 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);
- @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.
-*/
+/**
+ * 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);
/**
- Frees an error message returned by sp_last_error_message().
-*/
+ * 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 /* LIBSERIALPORT_H */
-
+#endif
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