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95 lines
1.6 KiB
95 lines
1.6 KiB
FUNCTION_BLOCK BS_GETCRC16
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VAR_EXTERNAL
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END_VAR
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VAR_INPUT
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(*CRC_ADR :dword;*)
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CRC_IN : array[0..200] of byte;
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CRC_LEN :INT;
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END_VAR
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VAR_OUTPUT
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CRC16H :byte;
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CRC16L :byte;
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END_VAR
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VAR
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(*CRC计算用定义*)
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CRC16Lo,CRC16Hi : Byte;
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CL,CH : Byte;
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SaveHi,SaveLo : Byte;
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Flag: Int;
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i : int;
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j : int;
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k : int;
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VALCRC : array[0..100] of byte;
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v2v : NW_MemCopy;
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p1,p2 : pointer;
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(*
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MemToVar : AdvMemToVar;
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VarToMem : AdvVarToMem;
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*)
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END_VAR
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(*
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时 间：20200924
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版 本：1.0
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作 者：姚立
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名 称：CRC校验
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说 明：
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备 注：
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INPUT:
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CRC_IN : array[0..200] of byte; modbus发送序列
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CRC_LEN :INT; 发送序列数据长度
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OUTPUT:
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CRC16H :byte;
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CRC16L :byte;
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*)
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(*MemToVar(EN :=true , DW_MEM_ADDR :=CRC_ADR , W_MEM_LEN :=CRC_LEN , STR_FILENAME :='OPCDA1' , STR_VARNAME :='VALCRC' );*)
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p1:=&VALCRC;
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p2:=&CRC_IN;
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v2v(DEST :=p1 , SRC :=p2 , LENGTH :=CRC_LEN , IQM :=0 );
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CRC16Lo := 255;
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CRC16Hi := 255;
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CL := 1;
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CH := 160;
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For i := 0 To (CRC_LEN-1) by 1 do
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CRC16Lo := CRC16Lo Xor VALCRC[i];
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For Flag := 0 To 7 by 1 do
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SaveHi := CRC16Hi;
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SaveLo := CRC16Lo;
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CRC16Hi := shr(CRC16Hi,1);
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CRC16Lo := shr(CRC16Lo,1);
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If ((SaveHi And 1) = 1) Then
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CRC16Lo := CRC16Lo Or 128;
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End_If;
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If ((SaveLo And 1) = 1) Then
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CRC16Hi := CRC16Hi Xor CH;
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CRC16Lo := CRC16Lo Xor CL;
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End_If;
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end_for;
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end_for;
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CRC16H:=CRC16Lo;
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CRC16L:=CRC16Hi;
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END_FUNCTION_BLOCK
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