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AnnexF/delay_st.txt
author mjsousa
Sat, 07 May 2016 21:17:49 +0100
changeset 1010 242907849850
parent 0 fb772792efd1
permissions -rwxr-xr-x
Correctly identify errors when parsing erroneous code (make sure flex goes back to INITIAL state when code contains errors that do not allow determining whether ST or IL is being parsed)
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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