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AnnexF/delay_st.txt
author Mario de Sousa <msousa@fe.up.pt>
Wed, 14 Mar 2012 11:14:41 +0000
changeset 484 f78750994a82
parent 0 fb772792efd1
permissions -rwxr-xr-x
Clean code for comparison operations & operators.
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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