Add check bison version in configure.ac file.
To build correctly matiec we need bison greater or equals than 2.4 version.
Now the "configure" script is able to check if system has correctly requirements.
(*
* This file is part of matiec - a compiler for the programming
* languages defined in IEC 61131-3
*
* Copyright (C) 2011 Mario de Sousa (msousa@fe.up.pt)
*
* See COPYING and COPYING.LESSER files for copyright details.
* This library 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 library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* This code is made available on the understanding that it will not be
* used in safety-critical situations without a full and competent review.
*)
(*
* An IEC 61131-3 compiler.
*
* Based on the
* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
*
*)
(*
* This is part of the library conatining the functions
* and function blocks defined in the standard.
*
* Timer Function Blocks
* ---------------------
*
* NOTE: The timing diagrams in the comments (except the state variable)
* were taken from the IEC 61131-3 standard.
*)
(****************************************************************
TP - pulse timing - state machine
+--------+ ++ ++ +--------+
IN | | || || | |
--+ +-----++-++---+ +---------
t0 t1 t2 t3 t4 t5
+----+ +----+ +----+
Q | | | | | |
--+ +---------+ +--+ +-------------
t0 t0+PT t2 t2+PT t4 t4+PT
PT +---+ + +---+
: / | /| / |
ET : / | / | / |
: / | / | / |
: / | / | / |
0-+ +-----+ +--+ +---------
t0 t1 t2 t4 t5
2 +---+ + +---+
STATE 1 +----+ | +----| +----+ |
0 --+ +-----+ +--+ +---------
****************************************************************)
FUNCTION_BLOCK TP
VAR_INPUT
IN : BOOL; (* first input parameter *)
PT : TIME; (* second input parameter *)
END_VAR
VAR_OUTPUT
Q : BOOL := FALSE; (* first output parameter *)
ET : TIME := T#0s; (* second output parameter *)
END_VAR
VAR
STATE : SINT := 0; (* internal state: 0-reset, 1-counting, 2-set *)
PREV_IN : BOOL := FALSE;
CURRENT_TIME, START_TIME : TIME;
END_VAR
{__SET_VAR(data__->,CURRENT_TIME,__CURRENT_TIME)}
IF ((STATE = 0) AND NOT(PREV_IN) AND IN) (* found rising edge on IN *)
THEN
(* start timer... *)
STATE := 1;
Q := TRUE;
START_TIME := CURRENT_TIME;
ELSIF (STATE = 1)
THEN
IF ((START_TIME + PT) <= CURRENT_TIME)
THEN
STATE := 2;
Q := FALSE;
ET := PT;
ELSE
ET := CURRENT_TIME - START_TIME;
END_IF;
END_IF;
IF ((STATE = 2) AND NOT(IN))
THEN
ET := T#0s;
STATE := 0;
END_IF;
PREV_IN := IN;
END_FUNCTION_BLOCK
(****************************************************************
TON - On-delay timing - state machine
+--------+ +---+ +--------+
IN | | | | | |
--+ +--------+ +---+ +-------------
t0 t1 t2 t3 t4 t5
+---+ +---+
Q | | | |
-------+ +---------------------+ +-------------
t0+PT t1 t4+PT t5
PT +---+ +---+
: / | + / |
ET : / | /| / |
: / | / | / |
: / | / | / |
0-+ +--------+ +---+ +-------------
t0 t1 t2 t3 t4 t5
2 +---+ +---+
STATE 1 +----+ | +---+ +----+ |
0 --+ +--------+ +---+ +------
****************************************************************)
FUNCTION_BLOCK TON
VAR_INPUT
IN : BOOL; (* first input parameter *)
PT : TIME; (* second input parameter *)
END_VAR
VAR_OUTPUT
Q : BOOL := FALSE; (* first output parameter *)
ET : TIME := T#0s; (* second output parameter *)
END_VAR
VAR
STATE : SINT := 0; (* internal state: 0-reset, 1-counting, 2-set *)
PREV_IN : BOOL := FALSE;
CURRENT_TIME, START_TIME : TIME;
END_VAR
{__SET_VAR(data__->,CURRENT_TIME,__CURRENT_TIME)}
IF ((STATE = 0) AND NOT(PREV_IN) AND IN) (* found rising edge on IN *)
THEN
(* start timer... *)
STATE := 1;
Q := FALSE;
START_TIME := CURRENT_TIME;
ELSE
(* STATE is 1 or 2 !! *)
IF (NOT(IN))
THEN
ET := T#0s;
Q := FALSE;
STATE := 0;
ELSIF (STATE = 1)
THEN
IF ((START_TIME + PT) <= CURRENT_TIME)
THEN
STATE := 2;
Q := TRUE;
ET := PT;
ELSE
ET := CURRENT_TIME - START_TIME;
END_IF;
END_IF;
END_IF;
PREV_IN := IN;
END_FUNCTION_BLOCK
(****************************************************************
TOF - Off-delay timing - state machine
+--------+ +---+ +--------+
IN | | | | | |
---+ +--------+ +---+ +-----------
t0 t1 t2 t3 t4 t5
+-------------+ +---------------------+
Q | | | |
---+ +---+ +------
t0 t1+PT t2 t5+PT
PT +---+ +------
: / | + /
ET : / | /| /
: / | / | /
: / | / | /
0------------+ +---+ +--------+
t1 t3 t5
2 +---+ +------
STATE 1 +----+ | +---+ +----+
0 -------------+ +---+ +--------+
****************************************************************)
FUNCTION_BLOCK TOF
VAR_INPUT
IN : BOOL; (* first input parameter *)
PT : TIME; (* second input parameter *)
END_VAR
VAR_OUTPUT
Q : BOOL := FALSE; (* first output parameter *)
ET : TIME := T#0s; (* second output parameter *)
END_VAR
VAR
STATE : SINT := 0; (* internal state: 0-reset, 1-counting, 2-set *)
PREV_IN : BOOL := FALSE;
CURRENT_TIME, START_TIME : TIME;
END_VAR
{__SET_VAR(data__->,CURRENT_TIME,__CURRENT_TIME)}
IF ((STATE = 0) AND PREV_IN AND NOT(IN)) (* found falling edge on IN *)
THEN
(* start timer... *)
STATE := 1;
START_TIME := CURRENT_TIME;
ELSE
(* STATE is 1 or 2 !! *)
IF (IN)
THEN
ET := T#0s;
STATE := 0;
ELSIF (STATE = 1)
THEN
IF ((START_TIME + PT) <= CURRENT_TIME)
THEN
STATE := 2;
ET := PT;
ELSE
ET := CURRENT_TIME - START_TIME;
END_IF;
END_IF;
END_IF;
Q := IN OR (STATE = 1);
PREV_IN := IN;
END_FUNCTION_BLOCK