?? form1.frm
字號:
VERSION 5.00
Begin VB.Form Form1
BackColor = &H00C0FFFF&
Caption = "Modbus RTU CRC校驗"
ClientHeight = 2520
ClientLeft = 60
ClientTop = 645
ClientWidth = 5400
Icon = "Form1.frx":0000
LinkTopic = "Form1"
ScaleHeight = 2520
ScaleWidth = 5400
StartUpPosition = 2 '屏幕中心
Begin VB.CommandButton Command3
Caption = "清 除"
Height = 375
Left = 2160
TabIndex = 15
Top = 1800
Width = 975
End
Begin VB.CommandButton Command2
Caption = "退 出"
Height = 375
Left = 3840
TabIndex = 14
Top = 1800
Width = 975
End
Begin VB.TextBox Text9
Appearance = 0 'Flat
ForeColor = &H000000FF&
Height = 270
Left = 4440
TabIndex = 13
Top = 1200
Width = 735
End
Begin VB.TextBox Text8
Appearance = 0 'Flat
ForeColor = &H000000FF&
Height = 270
Left = 2760
TabIndex = 12
Top = 1185
Width = 735
End
Begin VB.TextBox Text7
Appearance = 0 'Flat
Height = 270
Left = 1080
TabIndex = 11
Top = 1200
Width = 735
End
Begin VB.TextBox Text6
Appearance = 0 'Flat
Height = 270
Left = 4440
TabIndex = 9
Top = 600
Width = 735
End
Begin VB.TextBox Text5
Appearance = 0 'Flat
Height = 270
Left = 3600
TabIndex = 8
Top = 600
Width = 735
End
Begin VB.TextBox Text4
Appearance = 0 'Flat
Height = 270
Left = 2760
TabIndex = 7
Top = 600
Width = 735
End
Begin VB.TextBox Text3
Appearance = 0 'Flat
Height = 270
Left = 1920
TabIndex = 6
Top = 600
Width = 735
End
Begin VB.TextBox Text2
Appearance = 0 'Flat
Height = 270
Left = 1080
TabIndex = 5
Top = 600
Width = 735
End
Begin VB.TextBox Text1
Appearance = 0 'Flat
Height = 270
Left = 240
TabIndex = 1
Text = "01"
Top = 600
Width = 735
End
Begin VB.CommandButton Command1
Caption = "生 成"
Height = 375
Left = 480
TabIndex = 0
Top = 1800
Width = 975
End
Begin VB.Label Label2
BackColor = &H00C0FFFF&
Caption = "地址"
ForeColor = &H00FF0000&
Height = 255
Left = 240
TabIndex = 10
Top = 240
Width = 615
End
Begin VB.Label Label4
BackColor = &H00C0FFFF&
Caption = "校驗低位"
ForeColor = &H000000FF&
Height = 255
Left = 1920
TabIndex = 4
Top = 1260
Width = 735
End
Begin VB.Label Label3
BackColor = &H00C0FFFF&
Caption = "校驗高位"
ForeColor = &H000000FF&
Height = 255
Left = 3600
TabIndex = 3
Top = 1260
Width = 735
End
Begin VB.Label Label5
BackColor = &H00C0FFFF&
Caption = "生成結果"
Height = 255
Left = 240
TabIndex = 2
Top = 1260
Width = 735
End
Begin VB.Menu About
Caption = "關于"
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub About_Click()
frmAbout.Show
End Sub
Private Sub Command1_Click()
Dim CRC() As Byte
Dim d() As Byte
ReDim d(5) As Byte
Dim s As String
Dim str As String
Dim i As Integer
d(0) = Val("&H" & Text1)
d(1) = Val("&H" & Text2)
d(2) = Val("&H" & Text3)
d(3) = Val("&H" & Text4)
d(4) = Val("&H" & Text5)
d(5) = Val("&H" & Text6)
CRC = CRC16(d)
str = CRC
s = ""
For i = 1 To LenB(str)
s = s + Hex(AscB(MidB(str, i, 1)))
Next i
Text7.Text = s
Text9.Text = Right(s, 2)
Text8.Text = Mid(s, 1, 2)
If Len(s) < 4 Then
Text8.Text = Mid(s, 1, 1)
End If
End Sub
Function CRC16(data() As Byte) As String
Dim CRC16Lo As Byte, CRC16Hi As Byte 'CRC寄存器
Dim CL As Byte, CH As Byte '多項式碼&HA001
Dim SaveHi As Byte, SaveLo As Byte
Dim i As Integer
Dim Flag As Integer
CRC16Lo = &HFF
CRC16Hi = &HFF
CL = &H1
CH = &HA0
For i = 0 To UBound(data)
CRC16Lo = CRC16Lo Xor data(i) '每一個數據與CRC寄存器進行異或
For Flag = 0 To 7
SaveHi = CRC16Hi
SaveLo = CRC16Lo
CRC16Hi = CRC16Hi \ 2 '高位右移一位
CRC16Lo = CRC16Lo \ 2 '低位右移一位
If ((SaveHi And &H1) = &H1) Then '如果高位字節最后一位為1
CRC16Lo = CRC16Lo Or &H80 '則低位字節右移后前面補1
End If '否則自動補0
If ((SaveLo And &H1) = &H1) Then '如果LSB為1，則與多項式碼進行異或
CRC16Hi = CRC16Hi Xor CH
CRC16Lo = CRC16Lo Xor CL
End If
Next Flag
Next i
Dim ReturnData(1) As Byte
ReturnData(0) = CRC16Hi 'CRC高位
ReturnData(1) = CRC16Lo 'CRC低位
CRC16 = ReturnData
End Function
Private Sub Command2_Click()
Unload Me
End Sub
Private Sub Command3_Click() '清除信息
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
Text4.Text = ""
Text5.Text = ""
Text6.Text = ""
Text7.Text = ""
Text8.Text = ""
Text9.Text = ""
End Sub
Private Sub Text1_LostFocus()
If (Text1.Text < 0) Then
Text1.Text = O
End If
If (Text1.Text > 255) Then
Text1.Text = 255
End If
End Sub
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