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AnnexF/stack_int_il.txt
author Mario de Sousa <msousa@fe.up.pt>
Tue, 31 Jul 2012 12:39:04 +0100
changeset 616 0c7663fdc8d3
parent 0 fb772792efd1
permissions -rwxr-xr-x
Aloow use of SFC STEPs as variables.
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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	LD	R1	(* Dispatch on operations *)
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	JMPC	RESET
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	LD	POP
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	ANDN	EMPTY	(* Don't pop empty stack *)
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	JMPC	POP_STK
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	LD	PUSH
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	ANDN	OFLO	(* Don't push overflowed stack *)
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	JMPC	PUSH_STK
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	RET		(* Return if no operations active *)
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RESET:	LD	0	(* Stack reset operations *)
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	ST	OFLO
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	LD	1
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	ST   	EMPTY
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	LD	-1
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	ST 	PTR
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	CAL	LIMIT(MN:=1,IN:=N,MX:=128)
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	ST	NI
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	JMP	ZRO_OUT
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POP_STK:	LD	0
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	ST	OFLO	(* Popped stack is not overflowing *)
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	LD	PTR
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	SUB	1
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	ST	PTR
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	LT	0	(* Empty when PTR < 0 *)
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	ST	EMPTY
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	JMPC	ZRO_OUT
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	LD	STK[PTR]
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	JMP	SET_OUT
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PUSH_STK:	LD	0
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	ST	EMPTY	(* Pushed stack is not empty *)
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	LD	PTR
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	ADD	1
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	ST	PTR
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	EQ	NI	(* Overflow when PTR = NI *)
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	ST	OFLO
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	JMPC	ZRO_OUT
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	LD	IN
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	ST	STK[PTR]	(* Push IN onto STK *)
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	JMP	SET_OUT
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ZRO_OUT:	LD	0	(* OUT=0 for EMPTY or OFLO *)
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SET_OUT:	ST 	OUT
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  END_FUNCTION_BLOCK













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