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AnnexF/diffeq_st.txt
author Laurent Bessard
Tue, 11 Sep 2012 01:05:24 +0200
changeset 628 fe0d516fe291
parent 0 fb772792efd1
permissions -rwxr-xr-x
Fix bug in SFC generated code. Action state was declared in the list of variables to debug, but wasn't stored using structure with flags. This error had side effects that makes Beremiz debug crash.
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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