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AnnexF/diffeq_st.txt
author Manuele Conti <conti.ma@alice.it>
Mon, 30 Jul 2012 22:59:00 +0200
changeset 622 eaa49b276e17
parent 0 fb772792efd1
permissions -rwxr-xr-x
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.
0
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 FUNCTION_BLOCK DIFFEQ
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   VAR_INPUT
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     RUN : BOOL ;             (* 1 = run, 0 = reset *)
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     XIN : REAL ;
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     A : ARRAY[1..] OF REAL ; (* Input coefficients *)
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     M : INT ;                (* Length of input history  *)
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     B : ARRAY[0..] OF REAL ; (* Output coefficients *)
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     N : INT ;                (* Length of output history *)
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   END_VAR
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   VAR_OUTPUT XOUT : REAL := 0.0 ; END_VAR
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   VAR  (* NOTE : Manufacturer may specify other array sizes *)
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     XI : ARRAY [0..128] OF REAL ; (* Input history  *)
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     XO : ARRAY [0..128] OF REAL ; (* Output history *)
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     I : INT ;
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   END_VAR
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   XO[0] := XOUT ; XI[0] := XIN ;
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   XOUT := B[0] * XIN ;
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   IF RUN THEN
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      FOR I := M TO 1 BY -1 DO
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          XOUT := XOUT + A[I] * XO[I] ; XO[I] := XO[I-1];
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      END_FOR;
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      FOR I := N TO 1 BY -1 DO
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          XOUT := XOUT + B[I] * XI[I] ; XI[I] := XI[I-1];
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      END_FOR;
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   ELSE
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      FOR I := 1 TO M DO XO[I] := 0.0; END_FOR;
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      FOR I := 1 TO N DO XI[I] := 0.0; END_FOR;
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   END_IF ;
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 END_FUNCTION_BLOCK
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