openport.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   void openport (struct _file_ * port, flag_t flags);
     *
     *   open the serial port named by port->name and set file descriptor
     *   port->file; datatype struct _file_ is define in tools/types.h;
     *
     *   this function no longer initializes port settings because there
     *   are too many differences in constants, variables and functions
     *   between Linux, OpenBSD, MacOSX and Windows to cleanly implement
     *   a single approach to serial port configuration; this means that
     *   users should manually configure a port and then leave it alone;
     *
     *   use stty on Linux systems and the Control Panel on Windows;
     *
     *   port configuration code for Linux and Windows can be enabled if
     *   needed by defining SERIAL_CONFIG at compile time; this will not
     *   restore original port setting when the port is closed;
     *
     *
     *   Contributor(s):
     *	Charles Maier <cmaier@qca.qualcomm.com>
     *	Mathieu Olivari <mathieu@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef OPENPORT_SOURCE
    #define OPENPORT_SOURCE

    #include <unistd.h>
    #include <stdlib.h>
    #include <errno.h>

    #if defined (WIN32)
    #	include <windows.h>
    #elif defined (__linux__)
    #	include <termios.h>
    #elif defined (__APPLE__)
    #	include <termios.h>
    #	include <net/ethernet.h>
    #elif defined (__OpenBSD__)
    #	include <termios.h>
    #else
    #error "Unknown Environment"
    #endif

    #include "../tools/types.h"
    #include "../tools/files.h"
    #include "../tools/flags.h"
    #include "../tools/error.h"
    #include "../serial/serial.h"

    void openport (struct _file_ * port, flag_t flags)

    {

    #if defined (WIN32)

    	HANDLE hSerial;
    	COMMTIMEOUTS timeouts;
    	hSerial = CreateFile (port->name, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
    	if (hSerial == INVALID_HANDLE_VALUE)
    	{
    		error (1, errno, "%s", port->name);
    	}
    	if (_anyset (flags, UART_DEFAULT))
    	{
    		DCB dcbSerial =
    		{
    			0
    		};
    		dcbSerial.DCBlength = sizeof (dcbSerial);
    		if (!GetCommState (hSerial, &dcbSerial))
    		{
    			error (1, errno, "Can't read state: %s", port->name);
    		}
    		if (_anyset (flags, UART_VERBOSE))
    		{
    			printf ("getting %s ", port->name);
    			printf ("Baud %6d ", dcbSerial.BaudRate);
    			printf ("Data %d ", dcbSerial.ByteSize);
    			printf ("Stop %d ", dcbSerial.StopBits);
    			printf ("Parity %d\n", dcbSerial.Parity);
    		}
    		dcbSerial.BaudRate = CBR_115200;
    		dcbSerial.ByteSize = DATABITS_8;
    		dcbSerial.StopBits = ONESTOPBIT;
    		dcbSerial.Parity = NOPARITY;
    		if (_anyset (flags, UART_VERBOSE))
    		{
    			printf ("setting %s ", port->name);
    			printf ("Baud %6d ", dcbSerial.BaudRate);
    			printf ("Data %d ", dcbSerial.ByteSize);
    			printf ("Stop %d ", dcbSerial.StopBits);
    			printf ("Parity %d\n", dcbSerial.Parity);
    		}
    		if (!SetCommState (hSerial, &dcbSerial))
    		{
    			error (1, errno, "Can't save state: %s", port->name);
    		}
    	}
    	timeouts.ReadIntervalTimeout = 10;
    	timeouts.ReadTotalTimeoutConstant = 50;
    	timeouts.ReadTotalTimeoutMultiplier = 10;
    	timeouts.WriteTotalTimeoutConstant = 50;
    	timeouts.WriteTotalTimeoutMultiplier = 10;
    	if (!SetCommTimeouts (hSerial, &timeouts))
    	{
    		error (1, errno, "Can't set timeouts: %s", port->name);
    	}
    	CloseHandle (hSerial);
    	if ((port->file = open (port->name, O_BINARY|O_RDWR)) == -1)
    	{
    		error (1, errno, "%s", port->name);
    	}

    #else

    	if ((port->file = open (port->name, O_BINARY|O_RDWR)) == -1)
    	{
    		error (1, errno, "%s", port->name);
    	}
    	if (_anyset (flags, UART_DEFAULT))
    	{
    		struct termios termios;

    #if 1

    /*
     *	POSIX generic code;
     */

    		tcgetattr (port->file, &termios);
    		cfmakeraw (&termios);
    		termios.c_cflag |= CS8;
    		termios.c_cflag &= ~(CSTOPB);
    		cfsetospeed (&termios, B115200);

    #else

    /*
     *	Linux specific code;
     */

    		termios.c_cflag = B115200 | CS8 | CLOCAL | CREAD;
    		termios.c_iflag = IGNPAR;
    		termios.c_oflag = 0;
    		termios.c_lflag = 0;
    		termios.c_cc [VTIME] = 0;
    		termios.c_cc [VMIN] = 5;

    #endif

    		tcsetattr (port->file, TCSANOW, &termios);
    	}

    #endif

    	return;
    }

    #endif

[PREV] [HOME] [NEXT]