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Tipo:
Funzione
Libreria LogicLab:
eLLabCommonLib
Libreria Codesys:
Non disponibile
Questa funzione esegue lo swap del valore di variabili, sono gestite operazioni diverse in base alla definizione di Mode. Gli indirizzi di Source e Destination possono coincidere rendendo possibile lo swap sulla variabile stessa.
Approfondimenti
- In questo topic un esempio di utilizzo della funzione.
- In questo topic un esempio di swap variabile REAL.
Descrizione
Destination (PVOID) Indirizzo variabile di destinazione.
Source (PVOID) Indirizzo variabile sorgente.
Type (VR_TYPE) Tipo variabile (Vedi definizione).
Mode (SWAP_MODE) Modo swap (Vedi definizione).
La funzione ritorna una variabile BOOL, FALSE: Errore esecuzione, TRUE: Esecuzione Ok.
Esempi
Come utilizzare gli esempi.
Nell’esempio sono eseguite alcune operazioni di swap su variabili.
LogicLab (Ptp201, ST_SwapData)
PROGRAM ST_SwapData
VAR
BYData : ARRAY[0..5] OF BYTE; (* Byte data example *)
WDData : ARRAY[0..5] OF WORD; (* Word data example *)
DWData : ARRAY[0..5] OF DWORD; (* DWord data example *)
LWData : ARRAY[0..5] OF LWORD; (* LWord data example *)
END_VAR
// *****************************************************************************
// PROGRAM "ST_SwapData"
// *****************************************************************************
// This program shows the use of SwapData function.
// -----------------------------------------------------------------------------
// -------------------------------------------------------------------------
// SOME HALF VARIABLE SWAPS
// -------------------------------------------------------------------------
// BYData[1] Source:=16#12, BYData[2] Destination:=16#21.
BYData[0]:=16#12; //Source
BYData[1]:=16#00; //Destination
eTO_JUNK(SwapData(ADR(BYData[1]), ADR(BYData[0]), BYTE_TYPE, SWAP_HALF));
// WDData[0] Source:=16#1234, WDData[1] Destination:=16#3412.
WDData[0]:=16#1234; //Source
WDData[1]:=16#0000; //Destination
eTO_JUNK(SwapData(ADR(WDData[1]), ADR(WDData[0]), WORD_TYPE, SWAP_HALF));
// DWData[0] Source:=16#12345678, DWData[1] Destination:=16#56781234.
DWData[0]:=16#12345678; //Source
DWData[1]:=16#00000000; //Destination
eTO_JUNK(SwapData(ADR(DWData[1]), ADR(DWData[0]), DWORD_TYPE, SWAP_HALF));
// LWData[0] Source:=16#0123456789ABCDEF, LWData[1] Destination:=16#89ABCDEF01234567.
LWData[0]:=16#0123456789ABCDEF; //Source
LWData[1]:=16#0000000000000000; //Destination
eTO_JUNK(SwapData(ADR(LWData[1]), ADR(LWData[0]), LWORD_TYPE, SWAP_HALF));
// -------------------------------------------------------------------------
// SOME VARIABLE SWAPS
// -------------------------------------------------------------------------
// Before: BYData[2] Source:=16#12, BYData[3] Destination:=16#34.
// After: BYData[2] Source:=16#34, BYData[3] Destination:=16#12.
BYData[2]:=16#12; //Source
BYData[3]:=16#34; //Destination
eTO_JUNK(SwapData(ADR(BYData[3]), ADR(BYData[2]), BYTE_TYPE, SWAP_VARS));
// Before: WDData[2] Source:=16#1234, WDData[3] Destination:=16#5678.
// After: WDData[2] Source:=16#5678, WDData[3] Destination:=16#1234.
WDData[2]:=16#1234; //Source
WDData[3]:=16#5678; //Destination
eTO_JUNK(SwapData(ADR(WDData[3]), ADR(WDData[2]), WORD_TYPE, SWAP_VARS));
// Before: DWData[2] Source:=16#12345678, DWData[3] Destination:=16#56789ABC.
// After: DWData[2] Source:=16#56789ABC, DWData[3] Destination:=16#12345678.
DWData[2]:=16#12345678; //Source
DWData[3]:=16#56789ABC; //Destination
eTO_JUNK(SwapData(ADR(DWData[3]), ADR(DWData[2]), DWORD_TYPE, SWAP_VARS));
// Before: LWData[2] Source:=16#0123456789ABCDEF, LWData[3] Destination:=16#FEDCBA9801234567.
// After: LWData[2] Source:=16#FEDCBA9801234567, LWData[3] Destination:=16#0123456789ABCDEF.
LWData[2]:=16#0123456789ABCDEF; //LWord data example
LWData[3]:=16#FEDCBA9801234567; //LWord data example
eTO_JUNK(SwapData(ADR(LWData[3]), ADR(LWData[2]), LWORD_TYPE, SWAP_VARS));
// -------------------------------------------------------------------------
// SOME ENDIANNESS SWAPS
// -------------------------------------------------------------------------
// BYData[4] Source:=16#12, BYData[5] Destination:=16#12.
BYData[4]:=16#12; //Source
BYData[5]:=16#00; //Destination
eTO_JUNK(SwapData(ADR(BYData[5]), ADR(BYData[4]), BYTE_TYPE, SWAP_ENDIAN));
// WDData[4] Source:=16#1234, WDData[5] Destination:=16#3412.
WDData[4]:=16#1234; //Source
WDData[5]:=16#0000; //Destination
eTO_JUNK(SwapData(ADR(WDData[5]), ADR(WDData[4]), WORD_TYPE, SWAP_ENDIAN));
// DWData[4] Source:=16#12345678, DWData[5] Destination:=16#78563412.
DWData[4]:=16#12345678; //Source
DWData[5]:=16#00000000; //Destination
eTO_JUNK(SwapData(ADR(DWData[5]), ADR(DWData[4]), DWORD_TYPE, SWAP_ENDIAN));
// LWData[4] Source:=16#0123456789ABCDEF, LWData[5] Destination:=16#EFCDAB8967452301.
LWData[4]:=16#0123456789ABCDEF; //Source
LWData[5]:=16#0000000000000000; //Destination
eTO_JUNK(SwapData(ADR(LWData[5]), ADR(LWData[4]), LWORD_TYPE, SWAP_ENDIAN));
// [End of file]