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128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*
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* OpenMODBUS/TCP to RS-232/485 MODBUS RTU gateway
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*
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* tty.h - terminal I/O related procedures
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*
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* Copyright (c) 2002-2003, 2013, Victor Antonovich (v.antonovich@gmail.com)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: tty.h,v 1.4 2015/02/25 10:33:58 kapyar Exp $
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*/
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#ifndef _TTY_H
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#define _TTY_H
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#include "globals.h"
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#include "cfg.h"
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/*
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* Delay value calculation macros.
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* c - number of characters
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* b - bits per character
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* s - bits per second
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*/
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#define DV(c, b, s) (c * b * 1000000l / s)
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/*
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* Default tty port parameters
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*/
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#if defined (__CYGWIN__)
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# define DEFAULT_PORT "/dev/COM1"
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#elif defined (__linux__)
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# define DEFAULT_PORT "/dev/ttyS0"
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#else
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# define DEFAULT_PORT "/dev/cuaa0"
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#endif
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#define DEFAULT_SPEED 19200
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#define DEFAULT_BSPEED B19200
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#define DEFAULT_MODE "8N1"
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#define DEFAULT_BITS_PER_CHAR 10
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/*
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* Maximum tty buffer size
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*/
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#define TTY_BUFSIZE 256
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/*
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* TRX control types
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*/
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#ifdef TRXCTL
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#define TRX_ADDC 0
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#define TRX_RTS 1
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#define TRX_SYSFS_1 2
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#define TRX_SYSFS_0 3
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#endif
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/*
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* TTY device FSM states
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*/
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#define TTY_PAUSE 0
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#define TTY_READY 1
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#define TTY_RQST 2
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#define TTY_RESP 3
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#define TTY_PROC 4
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/*
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* TTY related data storage structure
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*/
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typedef struct
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{
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int fd; /* tty file descriptor */
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int speed; /* serial port speed */
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char *port; /* serial port device name */
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int bpc; /* bits per character */
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#ifdef TRXCTL
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int trxcntl; /* trx control type (enum - see values in config.h) */
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#endif
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struct termios tios; /* working termios structure */
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struct termios savedtios; /* saved termios structure */
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int state; /* current state */
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unsigned int trynum; /* try counter */
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unsigned long timer; /* time tracking variable */
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unsigned int txlen; /* tx data length */
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unsigned int rxlen; /* rx data length */
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unsigned char ptrbuf; /* ptr in the buffer */
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unsigned char rxoffset; /* ptr in the buffer */
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unsigned char txbuf[TTY_BUFSIZE]; /* transmitting buffer */
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unsigned char rxbuf[TTY_BUFSIZE]; /* receiving buffer */
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} ttydata_t;
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/* prototypes */
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void tty_sighup(void);
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void tty_init(ttydata_t *mod);
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int tty_open(ttydata_t *mod);
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int tty_set_attr(ttydata_t *mod);
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speed_t tty_transpeed(int speed);
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int tty_cooked(ttydata_t *mod);
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int tty_close(ttydata_t *mod);
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void tty_set_rts(int fd);
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void tty_clr_rts(int fd);
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void tty_delay(int usec);
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#endif /* _TTY_H */
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