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FUNCTION_BLOCK Generate_CRC
VAR_INPUT
pData:POINTER
TO BYTE;
byteCounter:WORD;
END_VAR
VAR_OUTPUT
CRC_Code:WORD;
FINISH:BOOL:=FALSE;
END_VAR
VAR
Reg16: WORD;
j: BYTE;
i: WORD;
mval: WORD;
temp_byte: BYTE;
flg: WORD;
END_VAR
浠ヤ笅鏄疭T瑾炶█鐨勭▼搴忎唬纰奸儴鍒嗭細
Reg16 := 16#FFFF;
mval := 16#A001;
FOR i:=0 TO byteCounter-1 BY 1 DO
temp_byte:=pData锔�;
pData:=pData+1;
Reg16:=锛圧eg16 XOR temp_byte锛�;
FOR j:=0 TO 7 BY 1 DO
flg := 0;
flg:=锛圧eg16 AND 16#0001锛�;
Reg16 := SHR锛圧eg16,1锛�;
IF 锛坒lg = 1锛� THEN
Reg16:=Reg16 XOR mval;
END_IF;
END_FOR;
END_FOR;
CRC_Code:=Reg16;
FINISH:=TRUE;
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