SwapData, swap data value

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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
    i : BOOL;    (* Auxiliary variable *)
    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 VARIABLE COPY
    // -------------------------------------------------------------------------
    // Copy BYTE, Source:=16#12, Destination:=16#12.

    BYData[1]:=16#12; //Byte data example
    i:=SwapData(ADR(BYData[0]), ADR(BYData[1]), BYTE_TYPE, SWAP_COPY);

    // -------------------------------------------------------------------------
    // SOME HALF VARIABLE SWAPS
    // -------------------------------------------------------------------------
    // Swap BYTE, Source:=16#12, Destination:=16#21.

    BYData[0]:=16#12; //Byte data example
    i:=SwapData(ADR(BYData[1]), ADR(BYData[0]), BYTE_TYPE, SWAP_HALF);

    // Swap WORD, Source:=16#1234, Destination:=16#3412.

    WDData[0]:=16#1234; //Word data example
    i:=SwapData(ADR(WDData[1]), ADR(WDData[0]), WORD_TYPE, SWAP_HALF);

    // Swap DWORD, Source:=16#12345678, Destination:=16#56781234.

    DWData[0]:=16#12345678; //DWord data example
    i:=SwapData(ADR(DWData[1]), ADR(DWData[0]), DWORD_TYPE, SWAP_HALF);

    // Swap LWORD, Source:=16#0123456789ABCDEF, Destination:=16#89ABCDEF01234567.

    LWData[0]:=16#0123456789ABCDEF; //LWord data example
    i:=SwapData(ADR(LWData[1]), ADR(LWData[0]), LWORD_TYPE, SWAP_HALF);

    // -------------------------------------------------------------------------
    // SOME VARIABLE SWAPS
    // -------------------------------------------------------------------------
    // Swap BYTE, values of source and destination are swapped.

    BYData[2]:=16#34; //Byte data example
    BYData[3]:=16#12; //Byte data example
    i:=SwapData(ADR(BYData[3]), ADR(BYData[2]), BYTE_TYPE, SWAP_VARS);

    // Swap WORD, values of source and destination are swapped.

    WDData[2]:=16#5678; //Word data example
    WDData[3]:=16#1234; //Word data example
    i:=SwapData(ADR(WDData[3]), ADR(WDData[2]), WORD_TYPE, SWAP_VARS);

    // Swap DWORD, Source:=16#12345678, Destination:=16#56781234.

    DWData[2]:=16#89ABCDEF; //DWord data example
    DWData[3]:=16#01234567; //DWord data example
    i:=SwapData(ADR(DWData[3]), ADR(DWData[2]), DWORD_TYPE, SWAP_VARS);

    // Swap LWORD, Source:=16#12345678, Destination:=16#56781234.

    LWData[2]:=16#FEDCBA9801234567; //DWord data example
    LWData[3]:=16#0123456789ABCDEF; //DWord data example
    i:=SwapData(ADR(LWData[3]), ADR(LWData[2]), LWORD_TYPE, SWAP_VARS);

    // -------------------------------------------------------------------------
    // SOME ENDIANNESS SWAPS
    // -------------------------------------------------------------------------
    // Swap BYTE, Source:=16#12, Destination:=16#12.

    BYData[4]:=16#12; //Byte data example
    i:=SwapData(ADR(BYData[5]), ADR(BYData[4]), BYTE_TYPE, SWAP_ENDIAN);

    // Swap WORD, Source:=16#1234, Destination:=16#3412.

    WDData[4]:=16#1234; //Word data example
    i:=SwapData(ADR(WDData[5]), ADR(WDData[4]), WORD_TYPE, SWAP_ENDIAN);

    // Swap DWORD, Source:=16#12345678, Destination:=16#78563412.

    DWData[4]:=16#12345678; //DWord data example
    i:=SwapData(ADR(DWData[5]), ADR(DWData[4]), DWORD_TYPE, SWAP_ENDIAN);

    // Swap LWORD, Source:=16#0123456789ABCDEF, Destination:=16#EFCDAB8967452301;

    LWData[4]:=16#0123456789ABCDEF; //LWord data example
    i:=SwapData(ADR(LWData[5]), ADR(LWData[4]), LWORD_TYPE, SWAP_ENDIAN);

// [End of file]

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