*/
/**
- *
* @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 Errors
*
* 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_read() and sp_write().
*/
-#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. */
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. */
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. */
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. */
- 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_config;
/**
@defgroup Enumeration Port enumeration
*
* 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.
*/
enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr);
* 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.
*/
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.
*/
enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr);
/**
* @}
- * @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.
*/
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.
*/
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 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 setting that is in a state not recognised or supported by
- * libserialport will have its value set to -1 in the struct.
+ * 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
*/
enum sp_return sp_get_config(struct sp_port *port, struct sp_port_config *config);
/**
* Set the configuration for the specified serial port.
*
- * The user should populate a struct sp_port_config, then pass a pointer to it
- * as the config parameter.
- *
- * To retain the current value of any setting, set that field to -1.
+ * 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @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);
* @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.
*/
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.
+ */
+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 to use. Valid values are 5 to 8.
+ * @param bits Number of data 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.
*/
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.
+ */
+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 to use.
+ * @param parity Parity setting.
*
- * @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.
*/
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.
+ */
+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 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.
*/
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.
*/
-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.
+ */
+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.
*/
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.
+ */
+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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
*/
enum sp_return sp_set_cts(struct sp_port *port, enum sp_cts cts);
/**
- * Set the DTR pin behaviour for the specified port.
+ * 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
*/
enum sp_return sp_set_dtr(struct sp_port *port, enum sp_dtr dtr);
/**
- * Set the RTS pin behaviour for the specified port.
+ * 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 on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * for invalid arguments.
+ * @return SP_OK upon success, a negative error code otherwise.
*/
enum sp_return sp_set_dsr(struct sp_port *port, enum sp_dsr dsr);
/**
- * Configure XON/XOFF flow control for the specified port.
+ * 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 flow control mode.
+ * @param xon_xoff XON/XOFF 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.
*/
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.
+ * Read bytes from the specified serial port, blocking until available.
*
- * 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.
+ */
+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.
*/
-enum sp_return sp_read(struct sp_port *port, void *buf, size_t count);
+enum sp_return sp_nonblocking_read(struct sp_port *port, void *buf, size_t count);
/**
- * Write bytes to the specified serial port.
+ * Write bytes to the specified serial port, blocking until complete.
*
- * 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 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, 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.
*/
-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);
/**
* 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.
*/
enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers);
/**
* Wait for buffered data to be transmitted.
*
- * @return SP_OK on success, SP_ERR_FAIL on failure, or SP_ERR_ARG
- * if an invalid port is passed.
+ * @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
*/
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
projects / libserialport.git / blobdiff