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- Committer: Bazaar Package Importer
- Author(s): Jesus Roncero
- Date: 2004-09-01 01:34:37 UTC
- Revision ID: james.westby@ubuntu.com-20040901013437-eicsrrd40dr371u0
Tags: upstream-3.3.2
Import upstream version 3.3.2
- files added:
- contrib
- perl
- python
- python/gui
- python/mysql
- rrdb
- src
- userial
- userial/ds2490
- userial/ds9097
- userial/ds9097u
added
removed
userial/ds9097u/linuxlnk.c
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//---------------------------------------------------------------------------
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// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
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// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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// Except as contained in this notice, the name of Dallas Semiconductor
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// shall not be used except as stated in the Dallas Semiconductor
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// Branding Policy.
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//---------------------------------------------------------------------------
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//
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// linuxlnk.C - COM functions required by MLANLL.C, MLANTRNU, MLANNETU.C and
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// MLanFile.C for MLANU to communicate with the DS2480 based
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// Universal Serial Adapter 'U'. Fill in the platform specific code.
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//
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// Version: 1.02
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//
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// History: 1.00 -> 1.01 Added function msDelay.
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//
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// 1.01 -> 1.02 Changed to generic OpenCOM/CloseCOM for easier
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// use with other platforms.
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//
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//--------------------------------------------------------------------------
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// Copyright (C) 1998 Andrea Chambers and University of Newcastle upon Tyne,
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// All Rights Reserved.
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//--------------------------------------------------------------------------
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE UNIVERSITY OF NEWCASTLE UPON TYNE OR ANDREA CHAMBERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//---------------------------------------------------------------------------
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//
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// LinuxLNK.C - COM functions required by MLANLLU.C, MLANTRNU.C, MLANNETU.C
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// and MLanFile.C for MLANU to communicate with the DS2480 based
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// Universal Serial Adapter 'U'. Platform specific code.
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//
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// Version: 2.01
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// History: 1.02 -> 1.03 modifications by David Smiczek
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// Changed to use generic OpenCOM/CloseCOM
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// Pass port name to OpenCOM instead of hard coded
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// Changed msDelay to handle long delays
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// Reformatted to look like 'TODO.C'
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// Added #include "ds2480.h" to use constants.
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// Added function SetBaudCOM()
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// Added function msGettick()
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// Removed delay from WriteCOM(), used tcdrain()
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// Added wait for byte available with timeout using
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// select() in ReadCOM()
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//
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// 1.03 -> 2.00 Support for multiple ports. Include "ownet.h". Use
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// 'uchar'. Reorder functions. Provide correct
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// return values to OpenCOM. Replace 'makeraw' call.
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// Should now be POSIX.
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// 2.00 -> 2.01 Added support for owError library.
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//
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#include <unistd.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 <sys/ioctl.h>
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#include <time.h>
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#include <termios.h>
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#include <errno.h>
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#include <sys/time.h>
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#include "ds2480.h"
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#include "ownet.h"
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/* exportable functions */
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SMALLINT OpenCOM(int, char*);
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SMALLINT WriteCOM(int, int, uchar*);
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void CloseCOM(int);
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void FlushCOM(int);
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int ReadCOM(int, int, uchar*);
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void BreakCOM(int);
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void SetBaudCOM(int, int);
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void msDelay(int);
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long msGettick(void);
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// LinuxLNK global
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int fd[MAX_PORTNUM];
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struct termios origterm;
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//---------------------------------------------------------------------------
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// Attempt to open a com port.
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// Set the starting baud rate to 9600.
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number provided will
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// be used to indicate the port number desired when calling
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// all other functions in this library.
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//
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// 'port_zstr' - zero terminate port name. For this platform
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// use format COMX where X is the port number.
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//
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//
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// Returns: TRUE(1) - success, COM port opened
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// FALSE(0) - failure, could not open specified port
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//
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SMALLINT OpenCOM(int portnum, char *port_zstr)
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{
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struct termios t; // see man termios - declared as above
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int rc;
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fd[portnum] = open(port_zstr, O_RDWR|O_NONBLOCK);
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if (fd[portnum]<0)
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{
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OWERROR(OWERROR_GET_SYSTEM_RESOURCE_FAILED);
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return FALSE; // changed (2.00), used to return fd;
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}
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rc = tcgetattr (fd[portnum], &t);
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if (rc < 0)
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{
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int tmp;
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tmp = errno;
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close(fd[portnum]);
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errno = tmp;
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OWERROR(OWERROR_SYSTEM_RESOURCE_INIT_FAILED);
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return FALSE; // changed (2.00), used to return rc;
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}
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cfsetospeed(&t, B9600);
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cfsetispeed (&t, B9600);
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// Get terminal parameters. (2.00) removed raw
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tcgetattr(fd[portnum],&t);
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// Save original settings.
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origterm = t;
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// Set to non-canonical mode, and no RTS/CTS handshaking
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t.c_iflag &= ~(BRKINT|ICRNL|IGNCR|INLCR|INPCK|ISTRIP|IXON|IXOFF|PARMRK);
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t.c_iflag |= IGNBRK|IGNPAR;
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t.c_oflag &= ~(OPOST);
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t.c_cflag &= ~(CRTSCTS|CSIZE|HUPCL|PARENB);
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t.c_cflag |= (CLOCAL|CS8|CREAD);
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t.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|ICANON|IEXTEN|ISIG);
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t.c_cc[VMIN] = 0;
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t.c_cc[VTIME] = 3;
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rc = tcsetattr(fd[portnum], TCSAFLUSH, &t);
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tcflush(fd[portnum],TCIOFLUSH);
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if (rc < 0)
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{
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int tmp;
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tmp = errno;
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close(fd[portnum]);
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errno = tmp;
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OWERROR(OWERROR_SYSTEM_RESOURCE_INIT_FAILED);
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return FALSE; // changed (2.00), used to return rc;
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}
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return TRUE; // changed (2.00), used to return fd;
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}
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//---------------------------------------------------------------------------
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// Closes the connection to the port.
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
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// OpenCOM to indicate the port number.
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//
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void CloseCOM(int portnum)
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{
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// restore tty settings
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tcsetattr(fd[portnum], TCSAFLUSH, &origterm);
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FlushCOM(portnum);
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close(fd[portnum]);
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}
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//--------------------------------------------------------------------------
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// Write an array of bytes to the COM port, verify that it was
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// sent out. Assume that baud rate has been set.
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number provided will
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// be used to indicate the port number desired when calling
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// all other functions in this library.
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// Returns 1 for success and 0 for failure
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//
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SMALLINT WriteCOM(int portnum, int outlen, uchar *outbuf)
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{
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long count = outlen;
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int i = write(fd[portnum], outbuf, outlen);
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tcdrain(fd[portnum]);
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return (i == count);
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}
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//--------------------------------------------------------------------------
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// Read an array of bytes to the COM port, verify that it was
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// sent out. Assume that baud rate has been set.
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
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// OpenCOM to indicate the port number.
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// 'outlen' - number of bytes to write to COM port
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// 'outbuf' - pointer ot an array of bytes to write
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//
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// Returns: Number of bytes actually read
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//
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int ReadCOM(int portnum, int inlen, uchar *inbuf)
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{
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fd_set filedescr;
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struct timeval tval;
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int cnt;
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int sel;
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int msec = 0;
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extern int global_msec,
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global_msec_max;
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// loop to wait until each byte is available and read it
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for (cnt = 0; cnt < inlen; cnt++)
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{
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if( msec < global_msec )
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msec = global_msec;
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// set a descriptor to wait for a character available
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FD_ZERO(&filedescr);
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FD_SET(fd[portnum],&filedescr);
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// set initial timeout to global_msec ms
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tval.tv_sec = 1;
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tval.tv_usec = 1000 * msec;
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// if byte available read or return bytes read
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sel = select(fd[portnum]+1,&filedescr,NULL,NULL,&tval);
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if ( sel > 0 )
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{
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if (read(fd[portnum],&inbuf[cnt],1) != 1)
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{
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/* Received something, return it */
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return cnt;
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}
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} else if( sel == 0 ) {
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/* We timed out waiting for a character, so increase the limit */
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global_msec++;
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cnt = -1;
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#ifdef DEBUG_USERIAL
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fprintf(stderr, "Increasing delay to %ld\n", global_msec * 1000 );
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#endif /* DEBUG_USERIAL */
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/* don't go too high, just return an error (0) */
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if( global_msec > global_msec_max )
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return 0;
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} else {
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return cnt;
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} /* select if */
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} /* count loop */
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// success, so return desired length
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return inlen;
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}
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//---------------------------------------------------------------------------
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// Description:
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// flush the rx and tx buffers
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
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// OpenCOM to indicate the port number.
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//
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void FlushCOM(int portnum)
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{
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tcflush(fd[portnum], TCIOFLUSH);
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}
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//--------------------------------------------------------------------------
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// Description:
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// Send a break on the com port for at least 2 ms
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
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// OpenCOM to indicate the port number.
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//
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void BreakCOM(int portnum)
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{
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int duration = 0; // see man termios break may be
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tcsendbreak(fd[portnum], duration); // too long
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}
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//--------------------------------------------------------------------------
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// Set the baud rate on the com port.
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
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// OpenCOM to indicate the port number.
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// 'new_baud' - new baud rate defined as
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// PARMSET_9600 0x00
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// PARMSET_19200 0x02
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// PARMSET_57600 0x04
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// PARMSET_115200 0x06
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//
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void SetBaudCOM(int portnum, int new_baud)
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{
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struct termios t;
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int rc;
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speed_t baud=B9600;
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// read the attribute structure
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rc = tcgetattr(fd[portnum], &t);
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if (rc < 0)
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{
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close(fd[portnum]);
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return;
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}
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// convert parameter to linux baud rate
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switch(new_baud)
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{
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case PARMSET_9600:
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baud = B9600;
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break;
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case PARMSET_19200:
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baud = B19200;
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break;
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case PARMSET_57600:
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baud = B57600;
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break;
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case PARMSET_115200:
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baud = B115200;
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break;
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}
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// set baud in structure
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cfsetospeed(&t, baud);
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cfsetispeed(&t, baud);
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// change baud on port
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rc = tcsetattr(fd[portnum], TCSAFLUSH, &t);
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if (rc < 0)
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close(fd[portnum]);
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}
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//--------------------------------------------------------------------------
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// Get the current millisecond tick count. Does not have to represent
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// an actual time, it just needs to be an incrementing timer.
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//
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long msGettick(void)
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{
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struct timezone tmzone;
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struct timeval tmval;
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long ms;
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gettimeofday(&tmval,&tmzone);
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ms = (tmval.tv_sec & 0xFFFF) * 1000 + tmval.tv_usec / 1000;
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return ms;
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}
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//--------------------------------------------------------------------------
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// Description:
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// Delay for at least 'len' ms
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//
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void msDelay(int len)
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{
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struct timespec s; // Set aside memory space on the stack
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s.tv_sec = len / 1000;
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s.tv_nsec = (len - (s.tv_sec * 1000)) * 1000000;
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nanosleep(&s, NULL);
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}
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