/* * OpenMODBUS/TCP to RS-232/485 MODBUS RTU gateway * * tty.h - terminal I/O related procedures * * Copyright (c) 2002-2003, Victor Antonovich (avmlink@vlink.ru) *  * Redistribution and use in source and binary forms, with or without * modification, are permitted 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. *  * 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 REGENTS 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. * * $Id: tty.h,v 1.2 2003/09/27 13:22:52 kapyar Exp $ */#ifndef _TTY_H#define _TTY_H#include "globals.h"#include "cfg.h"/* * Delay value calculation macros   */#define	DV(x, y) (x * 10000000l / y)/* * Default tty port parameters */#if defined (__CYGWIN__)#  define DEFAULT_PORT "/dev/COM1"#elif defined (__linux__)#  define DEFAULT_PORT "/dev/ttyS0"#else#  define DEFAULT_PORT "/dev/cuaa0"#endif#define DEFAULT_SPEED 19200#define DEFAULT_BSPEED B19200/* * Maximum tty buffer size */#define TTY_BUFSIZE 256/*  * TRX control types */#ifdef  TRX_CTL#  define TRX_ADDC 0#  define TRX_RTS  !TRX_ADDC#endif/* * TTY device FSM states */#define TTY_PAUSE 0#define TTY_READY 1#define TTY_RQST  2#define TTY_RESP  3 /* * TTY related data storage structure */typedef struct{  int fd;                       /* tty file descriptor */  int speed;                    /* serial port speed */  char *port;                   /* serial port device name */#ifdef TRXCTL  int trxcntl;                  /* trx control type (0 - ADDC, RTS otherwise) */#endif  struct termios tios;          /* working termios structure */  struct termios savedtios;     /* saved termios structure */  int state;                    /* current state */  unsigned int trynum;             /* try counter */  unsigned long timer;          /* time tracking variable */  unsigned int txlen;           /* tx data length */  unsigned int rxlen;           /* rx data length */  unsigned char ptrbuf;         /* ptr in the buffer */  unsigned char txbuf[TTY_BUFSIZE]; /* transmitting buffer */  unsigned char rxbuf[TTY_BUFSIZE]; /* receiving buffer */} ttydata_t;/* prototypes */void tty_sighup(void);#ifdef TRXCTLvoid tty_init(ttydata_t *mod, char *port, int speed, int trxcntl);#elsevoid tty_init(ttydata_t *mod, char *port, int speed);#endifint tty_open(ttydata_t *mod);int tty_set_attr(ttydata_t *mod);speed_t tty_transpeed(int speed);int tty_cooked(ttydata_t *mod);int tty_close(ttydata_t *mod);void tty_set_rts(int fd);void tty_clr_rts(int fd);void tty_delay(int usec);#endif /* _TTY_H */