mirror of
git://sigrok.org/libserialport
synced 2023-08-10 21:13:24 +03:00
Initial version. Builds for Linux and Windows.
This commit is contained in:
commit
74510d4b59
568
serialport.c
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568
serialport.c
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@ -0,0 +1,568 @@
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/*
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* This file is part of the libserialport project.
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*
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* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
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* Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
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||||
* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
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*
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||||
* This program is free software: you can redistribute it and/or modify
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||||
* it under the terms of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation, either version 3 of the
|
||||
* License, or (at your option) any later version.
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||||
*
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||||
* This program is distributed in the hope that it will be useful,
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||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
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||||
*
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||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <glob.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#endif
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#include <stdlib.h>
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#include <errno.h>
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#include "serialport.h"
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static int sp_validate_port(struct sp_port *port)
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{
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if (port == NULL)
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return 0;
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#ifdef _WIN32
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if (port->hdl == INVALID_HANDLE_VALUE)
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return 0;
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#else
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if (port->fd < 0)
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return 0;
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#endif
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return 1;
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}
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#define CHECK_PORT() do { if (!sp_validate_port(port)) return SP_ERR_ARG; } while (0)
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/**
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* Open the specified serial port.
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*
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* @param port Pointer to empty port structure allocated by caller.
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* @param portname Name of port to open.
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* @param flags Flags to use when opening the serial port. Possible flags
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* are: SP_MODE_RDWR, SP_MODE_RDONLY, SP_MODE_NONBLOCK.
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*
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* @return SP_OK on success, SP_ERR_FAIL on failure,
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* or SP_ERR_ARG if an invalid port or name is passed.
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*/
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int sp_open(struct sp_port *port, char *portname, int flags)
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{
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if (!port)
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return SP_ERR_ARG;
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if (!portname)
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return SP_ERR_ARG;
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port->name = portname;
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#ifdef _WIN32
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DWORD desired_access = 0, flags_and_attributes = 0;
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/* Map 'flags' to the OS-specific settings. */
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desired_access |= GENERIC_READ;
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flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
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if (flags & SP_MODE_RDWR)
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desired_access |= GENERIC_WRITE;
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if (flags & SP_MODE_NONBLOCK)
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flags_and_attributes |= FILE_FLAG_OVERLAPPED;
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port->hdl = CreateFile(port->name, desired_access, 0, 0,
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OPEN_EXISTING, flags_and_attributes, 0);
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if (port->hdl == INVALID_HANDLE_VALUE)
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return SP_ERR_FAIL;
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#else
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int flags_local = 0;
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/* Map 'flags' to the OS-specific settings. */
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if (flags & SP_MODE_RDWR)
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flags_local |= O_RDWR;
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if (flags & SP_MODE_RDONLY)
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flags_local |= O_RDONLY;
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if (flags & SP_MODE_NONBLOCK)
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flags_local |= O_NONBLOCK;
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if ((port->fd = open(port->name, flags_local)) < 0)
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return SP_ERR_FAIL;
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#endif
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return SP_OK;
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}
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/**
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* Close the specified serial port.
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*
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* @param port Pointer to port structure.
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*
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* @return SP_OK on success, SP_ERR_FAIL on failure,
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* or SP_ERR_ARG if an invalid port is passed.
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*/
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int sp_close(struct sp_port *port)
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{
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CHECK_PORT();
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#ifdef _WIN32
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/* Returns non-zero upon success, 0 upon failure. */
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if (CloseHandle(port->hdl) == 0)
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return SP_ERR_FAIL;
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#else
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/* Returns 0 upon success, -1 upon failure. */
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if (close(port->fd) == -1)
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return SP_ERR_FAIL;
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#endif
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return SP_OK;
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}
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/**
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* Flush serial port buffers.
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*
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* @param port Pointer to port structure.
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*
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* @return SP_OK on success, SP_ERR_FAIL on failure,
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* or SP_ERR_ARG if an invalid port is passed.
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*/
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int sp_flush(struct sp_port *port)
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{
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CHECK_PORT();
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#ifdef _WIN32
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/* Returns non-zero upon success, 0 upon failure. */
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if (PurgeComm(port->hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0)
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return SP_ERR_FAIL;
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#else
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/* Returns 0 upon success, -1 upon failure. */
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if (tcflush(port->fd, TCIOFLUSH) < 0)
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return SP_ERR_FAIL;
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#endif
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return SP_OK;
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}
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/**
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* Write a number of bytes to the specified serial port.
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*
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* @param port Pointer to port structure.
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* @param buf Buffer containing the bytes to write.
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* @param count Number of bytes to write.
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*
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* @return The number of bytes written, SP_ERR_FAIL on failure,
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* or SP_ERR_ARG if an invalid port is passed.
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*/
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int sp_write(struct sp_port *port, const void *buf, size_t count)
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{
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CHECK_PORT();
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if (!buf)
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return SP_ERR_ARG;
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#ifdef _WIN32
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DWORD written = 0;
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/* Returns non-zero upon success, 0 upon failure. */
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if (WriteFile(port->hdl, buf, count, &written, NULL) == 0)
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return SP_ERR_FAIL;
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return written;
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#else
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/* Returns the number of bytes written, or -1 upon failure. */
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ssize_t written = write(port->fd, buf, count);
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if (written < 0)
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return SP_ERR_FAIL;
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else
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return written;;
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#endif
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}
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/**
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* Read a number of bytes from the specified serial port.
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*
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* @param port Pointer to port structure.
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* @param buf Buffer where to store the bytes that are read.
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* @param count The number of bytes to read.
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*
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* @return The number of bytes read, SP_ERR_FAIL on failure,
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* or SP_ERR_ARG if an invalid port is passed.
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*/
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int sp_read(struct sp_port *port, void *buf, size_t count)
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{
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CHECK_PORT();
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if (!buf)
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return SP_ERR_ARG;
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#ifdef _WIN32
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DWORD bytes_read = 0;
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/* Returns non-zero upon success, 0 upon failure. */
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if (ReadFile(port->hdl, buf, count, &bytes_read, NULL) == 0)
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return SP_ERR_FAIL;
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return bytes_read;
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#else
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ssize_t bytes_read;
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/* Returns the number of bytes read, or -1 upon failure. */
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if ((bytes_read = read(port->fd, buf, count)) < 0)
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return SP_ERR_FAIL;
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return bytes_read;
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#endif
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}
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/**
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* Set serial parameters for the specified serial port.
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*
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* @param port Pointer to port structure.
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* @param baudrate The baudrate to set.
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* @param bits The number of data bits to use.
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* @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
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* @param stopbits The number of stop bits to use (1 or 2).
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* @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
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* 2 = XON/XOFF).
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*
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* @return The number of bytes read, SP_ERR_FAIL on failure,
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* or SP_ERR_ARG if an invalid argument is passed.
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*/
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int sp_set_params(struct sp_port *port, int baudrate,
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int bits, int parity, int stopbits,
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int flowcontrol, int rts, int dtr)
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{
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CHECK_PORT();
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#ifdef _WIN32
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DCB dcb;
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if (!GetCommState(port->hdl, &dcb))
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return SP_ERR_FAIL;
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switch (baudrate) {
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/*
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* The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
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* have documented CBR_* macros.
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*/
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case 110:
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dcb.BaudRate = CBR_110;
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break;
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case 300:
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dcb.BaudRate = CBR_300;
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break;
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case 600:
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dcb.BaudRate = CBR_600;
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break;
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case 1200:
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dcb.BaudRate = CBR_1200;
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break;
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case 2400:
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dcb.BaudRate = CBR_2400;
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break;
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case 4800:
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dcb.BaudRate = CBR_4800;
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break;
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case 9600:
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dcb.BaudRate = CBR_9600;
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break;
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case 14400:
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dcb.BaudRate = CBR_14400; /* Not available on Unix? */
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break;
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case 19200:
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dcb.BaudRate = CBR_19200;
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break;
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case 38400:
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dcb.BaudRate = CBR_38400;
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break;
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case 57600:
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dcb.BaudRate = CBR_57600;
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break;
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case 115200:
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dcb.BaudRate = CBR_115200;
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break;
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case 128000:
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dcb.BaudRate = CBR_128000; /* Not available on Unix? */
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break;
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case 256000:
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dcb.BaudRate = CBR_256000; /* Not available on Unix? */
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break;
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default:
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return SP_ERR_ARG;
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}
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switch (stopbits) {
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/* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
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case 1:
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dcb.StopBits = ONESTOPBIT;
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break;
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case 2:
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dcb.StopBits = TWOSTOPBITS;
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break;
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default:
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return SP_ERR_ARG;
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}
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switch (parity) {
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/* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */
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case SP_PARITY_NONE:
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dcb.Parity = NOPARITY;
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break;
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case SP_PARITY_EVEN:
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dcb.Parity = EVENPARITY;
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break;
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case SP_PARITY_ODD:
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dcb.Parity = ODDPARITY;
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break;
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default:
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return SP_ERR_ARG;
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}
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if (rts != -1) {
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if (rts)
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dcb.fRtsControl = RTS_CONTROL_ENABLE;
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||||
else
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dcb.fRtsControl = RTS_CONTROL_DISABLE;
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||||
}
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||||
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if (dtr != -1) {
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||||
if (dtr)
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dcb.fDtrControl = DTR_CONTROL_ENABLE;
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||||
else
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||||
dcb.fDtrControl = DTR_CONTROL_DISABLE;
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||||
}
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||||
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||||
if (!SetCommState(port->hdl, &dcb))
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||||
return SP_ERR_FAIL;
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||||
#else
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||||
struct termios term;
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speed_t baud;
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||||
int controlbits;
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||||
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||||
if (tcgetattr(port->fd, &term) < 0)
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||||
return SP_ERR_FAIL;
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||||
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||||
switch (baudrate) {
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||||
case 50:
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||||
baud = B50;
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||||
break;
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||||
case 75:
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||||
baud = B75;
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||||
break;
|
||||
case 110:
|
||||
baud = B110;
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||||
break;
|
||||
case 134:
|
||||
baud = B134;
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||||
break;
|
||||
case 150:
|
||||
baud = B150;
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||||
break;
|
||||
case 200:
|
||||
baud = B200;
|
||||
break;
|
||||
case 300:
|
||||
baud = B300;
|
||||
break;
|
||||
case 600:
|
||||
baud = B600;
|
||||
break;
|
||||
case 1200:
|
||||
baud = B1200;
|
||||
break;
|
||||
case 1800:
|
||||
baud = B1800;
|
||||
break;
|
||||
case 2400:
|
||||
baud = B2400;
|
||||
break;
|
||||
case 4800:
|
||||
baud = B4800;
|
||||
break;
|
||||
case 9600:
|
||||
baud = B9600;
|
||||
break;
|
||||
case 19200:
|
||||
baud = B19200;
|
||||
break;
|
||||
case 38400:
|
||||
baud = B38400;
|
||||
break;
|
||||
case 57600:
|
||||
baud = B57600;
|
||||
break;
|
||||
case 115200:
|
||||
baud = B115200;
|
||||
break;
|
||||
case 230400:
|
||||
baud = B230400;
|
||||
break;
|
||||
#if !defined(__APPLE__) && !defined(__OpenBSD__)
|
||||
case 460800:
|
||||
baud = B460800;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
return SP_ERR_ARG;
|
||||
}
|
||||
|
||||
if (cfsetospeed(&term, baud) < 0)
|
||||
return SP_ERR_FAIL;
|
||||
|
||||
if (cfsetispeed(&term, baud) < 0)
|
||||
return SP_ERR_FAIL;
|
||||
|
||||
term.c_cflag &= ~CSIZE;
|
||||
switch (bits) {
|
||||
case 8:
|
||||
term.c_cflag |= CS8;
|
||||
break;
|
||||
case 7:
|
||||
term.c_cflag |= CS7;
|
||||
break;
|
||||
default:
|
||||
return SP_ERR_ARG;
|
||||
}
|
||||
|
||||
term.c_cflag &= ~CSTOPB;
|
||||
switch (stopbits) {
|
||||
case 1:
|
||||
term.c_cflag &= ~CSTOPB;
|
||||
break;
|
||||
case 2:
|
||||
term.c_cflag |= CSTOPB;
|
||||
break;
|
||||
default:
|
||||
return SP_ERR_ARG;
|
||||
}
|
||||
|
||||
term.c_iflag &= ~(IXON | IXOFF);
|
||||
term.c_cflag &= ~CRTSCTS;
|
||||
switch (flowcontrol) {
|
||||
case 0:
|
||||
/* No flow control. */
|
||||
break;
|
||||
case 1:
|
||||
term.c_cflag |= CRTSCTS;
|
||||
break;
|
||||
case 2:
|
||||
term.c_iflag |= IXON | IXOFF;
|
||||
break;
|
||||
default:
|
||||
return SP_ERR_ARG;
|
||||
}
|
||||
|
||||
term.c_iflag &= ~IGNPAR;
|
||||
term.c_cflag &= ~(PARODD | PARENB);
|
||||
switch (parity) {
|
||||
case SP_PARITY_NONE:
|
||||
term.c_iflag |= IGNPAR;
|
||||
break;
|
||||
case SP_PARITY_EVEN:
|
||||
term.c_cflag |= PARENB;
|
||||
break;
|
||||
case SP_PARITY_ODD:
|
||||
term.c_cflag |= PARENB | PARODD;
|
||||
break;
|
||||
default:
|
||||
return SP_ERR_ARG;
|
||||
}
|
||||
|
||||
/* Turn off all serial port cooking. */
|
||||
term.c_iflag &= ~(ISTRIP | INLCR | ICRNL);
|
||||
term.c_oflag &= ~(ONLCR | OCRNL | ONOCR);
|
||||
#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
|
||||
term.c_oflag &= ~OFILL;
|
||||
#endif
|
||||
|
||||
/* Disable canonical mode, and don't echo input characters. */
|
||||
term.c_lflag &= ~(ICANON | ECHO);
|
||||
|
||||
/* Write the configured settings. */
|
||||
if (tcsetattr(port->fd, TCSADRAIN, &term) < 0)
|
||||
return SP_ERR_FAIL;
|
||||
|
||||
if (rts != -1) {
|
||||
controlbits = TIOCM_RTS;
|
||||
if (ioctl(port->fd, rts ? TIOCMBIS : TIOCMBIC,
|
||||
&controlbits) < 0)
|
||||
return SP_ERR_FAIL;
|
||||
}
|
||||
|
||||
if (dtr != -1) {
|
||||
controlbits = TIOCM_DTR;
|
||||
if (ioctl(port->fd, dtr ? TIOCMBIS : TIOCMBIC,
|
||||
&controlbits) < 0)
|
||||
return SP_ERR_FAIL;
|
||||
}
|
||||
#endif
|
||||
|
||||
return SP_OK;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get error code for 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)
|
||||
{
|
||||
#ifdef _WIN32
|
||||
return GetLastError();
|
||||
#else
|
||||
return errno;
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* Get error message for 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 can be freed after use by calling sp_free_error_message.
|
||||
*/
|
||||
char *sp_last_error_message(void)
|
||||
{
|
||||
#ifdef _WIN32
|
||||
LPVOID message;
|
||||
DWORD error = GetLastError();
|
||||
|
||||
FormatMessage(
|
||||
FORMAT_MESSAGE_ALLOCATE_BUFFER |
|
||||
FORMAT_MESSAGE_FROM_SYSTEM |
|
||||
FORMAT_MESSAGE_IGNORE_INSERTS,
|
||||
NULL,
|
||||
error,
|
||||
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
|
||||
(LPTSTR) &message,
|
||||
0, NULL );
|
||||
|
||||
return message;
|
||||
#else
|
||||
return strerror(errno);
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* Free error message.
|
||||
*
|
||||
* This function can be used to free a string returned by the
|
||||
* sp_last_error_message function.
|
||||
*/
|
||||
void sp_free_error_message(char *message)
|
||||
{
|
||||
#ifdef _WIN32
|
||||
LocalFree(message);
|
||||
#endif
|
||||
}
|
76
serialport.h
Normal file
76
serialport.h
Normal file
@ -0,0 +1,76 @@
|
||||
/*
|
||||
* This file is part of the libserialport project.
|
||||
*
|
||||
* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
|
||||
*
|
||||
* This program is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation, either version 3 of the
|
||||
* License, or (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <stddef.h>
|
||||
#ifdef _WIN32
|
||||
#include <windows.h>
|
||||
#endif
|
||||
|
||||
/* A serial port. */
|
||||
struct sp_port {
|
||||
/* Name used to open the port */
|
||||
char *name;
|
||||
/* OS-specific port handle */
|
||||
#ifdef _WIN32
|
||||
HANDLE hdl;
|
||||
#else
|
||||
int fd;
|
||||
#endif
|
||||
};
|
||||
|
||||
/* Return values. */
|
||||
enum {
|
||||
/* Operation completed successfully. */
|
||||
SP_OK = 0,
|
||||
/* A system error occured while executing the operation. */
|
||||
SP_ERR_FAIL = -1,
|
||||
/* Invalid arguments were passed to the function. */
|
||||
SP_ERR_ARG = -2
|
||||
};
|
||||
|
||||
/* Port access modes. */
|
||||
enum {
|
||||
/* Open port for read/write access. */
|
||||
SP_MODE_RDWR = 1,
|
||||
/* Open port for read access only. */
|
||||
SP_MODE_RDONLY = 2,
|
||||
/* Open port in non-blocking mode. */
|
||||
SP_MODE_NONBLOCK = 4
|
||||
};
|
||||
|
||||
/* Parity settings. */
|
||||
enum {
|
||||
/* No parity. */
|
||||
SP_PARITY_NONE = 0,
|
||||
/* Even parity. */
|
||||
SP_PARITY_EVEN = 1,
|
||||
/* Odd parity. */
|
||||
SP_PARITY_ODD = 2
|
||||
};
|
||||
|
||||
int sp_open(struct sp_port *port, char *portname, int flags);
|
||||
int sp_close(struct sp_port *port);
|
||||
int sp_flush(struct sp_port *port);
|
||||
int sp_write(struct sp_port *port, const void *buf, size_t count);
|
||||
int sp_read(struct sp_port *port, void *buf, size_t count);
|
||||
int sp_set_params(struct sp_port *port, int baudrate, int bits, int parity,
|
||||
int stopbits, int flowcontrol, int rts, int dtr);
|
||||
int sp_last_error_code(void);
|
||||
char *sp_last_error_message(void);
|
||||
void sp_free_error_message(char *message);
|
Loading…
Reference in New Issue
Block a user