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AnnexF/stack_int_st.txt
author mario
Fri, 16 Nov 2007 15:12:21 +0100
changeset 93 284ef59bb133
parent 0 fb772792efd1
permissions -rwxr-xr-x
Cleaning up comments.
0
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FUNCTION_BLOCK STACK_INT
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  VAR_INPUT PUSH, POP: BOOL R_EDGE; (* Basic stack operations *)
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            R1 : BOOL ;          (* Over-riding reset *)
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            IN : INT ;           (* Input to be pushed *)
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            N  : INT ;           (* Maximum depth after reset *)
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  END_VAR
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  VAR_OUTPUT EMPTY : BOOL := 1 ;     (* Stack empty *)
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             OFLO  : BOOL := 0 ;     (* Stack overflow *)
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             OUT   : INT  := 0 ;     (* Top of stack data *)
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  END_VAR
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  VAR STK : ARRAY[0..127] OF INT; (* Internal stack *)
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      NI : INT :=128  ;           (* Storage for N upon reset *)
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      PTR : INT := -1 ;           (* Stack pointer *)
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  END_VAR
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    (* Function Block body *)
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    IF R1 THEN
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       OFLO := 0; EMPTY := 1; PTR := -1;
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       NI := LIMIT (MN:=1,IN:=N,MX:=128); OUT := 0;
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    ELSIF POP & NOT EMPTY THEN
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       OFLO := 0; PTR := PTR-1; EMPTY := PTR < 0;
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       IF EMPTY THEN OUT := 0;
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       ELSE OUT := STK[PTR];
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       END_IF ;
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    ELSIF PUSH & NOT OFLO THEN
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       EMPTY := 0; PTR := PTR+1; OFLO := (PTR = NI);
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       IF NOT OFLO THEN OUT := IN ; STK[PTR] := IN;
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       ELSE OUT := 0;
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       END_IF ;
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    END_IF ;
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  END_FUNCTION_BLOCK













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