author | laurent |
Sat, 05 Dec 2009 18:38:53 +0100 | |
changeset 226 | 29f8ffc203c1 |
parent 0 | fb772792efd1 |
permissions | -rwxr-xr-x |
0
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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1 |
FUNCTION_BLOCK STACK_INT |
fb772792efd1
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VAR_INPUT PUSH, POP: BOOL R_EDGE; (* Basic stack operations *) |
fb772792efd1
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R1 : BOOL ; (* Over-riding reset *) |
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IN : INT ; (* Input to be pushed *) |
fb772792efd1
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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 *) |
fb772792efd1
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OFLO : BOOL := 0 ; (* Stack overflow *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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OUT : INT := 0 ; (* Top of stack data *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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END_VAR |
fb772792efd1
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VAR STK : ARRAY[0..127] OF INT; (* Internal stack *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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NI : INT :=128 ; (* Storage for N upon reset *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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PTR : INT := -1 ; (* Stack pointer *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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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 *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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JMPC POP_STK |
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LD PUSH |
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ANDN OFLO (* Don't push overflowed stack *) |
fb772792efd1
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JMPC PUSH_STK |
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RET (* Return if no operations active *) |
fb772792efd1
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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 |
fb772792efd1
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POP_STK: LD 0 |
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ST OFLO (* Popped stack is not overflowing *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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LD PTR |
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SUB 1 |
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ST PTR |
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Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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LT 0 (* Empty when PTR < 0 *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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ST EMPTY |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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JMPC ZRO_OUT |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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42 |
LD STK[PTR] |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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JMP SET_OUT |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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PUSH_STK: LD 0 |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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ST EMPTY (* Pushed stack is not empty *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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LD PTR |
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Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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ADD 1 |
fb772792efd1
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ST PTR |
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Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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EQ NI (* Overflow when PTR = NI *) |
fb772792efd1
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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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Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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JMP SET_OUT |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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ZRO_OUT: LD 0 (* OUT=0 for EMPTY or OFLO *) |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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SET_OUT: ST OUT |
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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|
fb772792efd1
Initial commit. Last MatPLC CVS with some makefile inclusion removed in order to compile fine out of MatPLC.
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END_FUNCTION_BLOCK |