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AnnexF/stack_int_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 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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