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AnnexF/delay_st.txt
author Edouard Tisserant
Fri, 19 Oct 2012 12:10:32 +0200
changeset 634 736b36a83548
parent 0 fb772792efd1
permissions -rwxr-xr-x
Added double curly braces for pragma (kept single curly braces for compatibility). Added macro def and undef surrounding pragma to simplify user code. Moved useless comment from generated code back to code generator.
0
fb772792efd1 Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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FUNCTION_BLOCK DELAY    (* N-sample delay *)
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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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    N   : INT        (* 0 <= N < 128 or manufacturer- *)
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  END_VAR            (*      specified maximum value  *)
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  VAR_OUTPUT XOUT : REAL; END_VAR   (* Delayed output *)
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  VAR X : ARRAY [0..127]     (* N-Element queue *)
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               OF REAL;      (* with FIFO discipline *)
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      I, IXIN, IXOUT : INT := 0;
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  END_VAR
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  IF RUN THEN IXIN := MOD(IXIN + 1, 128) ; X[IXIN] := XIN ;
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              IXOUT := MOD(IXOUT + 1, 128) ; XOUT := X[IXOUT];
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  ELSE XOUT := XIN ; IXIN := N ; IXOUT := 0;
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       FOR I := 0 TO N DO X[I] := XIN; END_FOR;
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  END_IF ;
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END_FUNCTION_BLOCK
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