EXcel中 怎么给单片机串口发指令发不下去
我的单片是这样的，外部中断一下向串口发送80,串口接收到VBA给它发的“95 10 20 25”给串口回90 ，都是十六进制，单片机程序没问题，我用串口调试助手都试过了， EXcel 中部分VBA程序如下
Dim HData As String
Dim cishu As Integer
Private Sub UserForm_Initialize()
cishu = 1
End Sub
Sub caiji()
Dim tem As Variant
Dim OutBuffer(3) As Byte
Dim strtemp As String
Select Case cishu
Case 1
TextBox1.Text = "0.5"
TextBox2.Text = ""
TextBox3.Text = ""
TextBox5.Text = ""
cishu = cishu + 1
' HData = ""
Case 2
TextBox2.Text = "4.5"
tem = 95
OutBuffer(0) = Val("&H" & tem)
tem = 10
OutBuffer(1) = Val("&H" & tem)
tem = 20
OutBuffer(2) = Val("&H" & tem)
tem = 25
OutBuffer(3) = Val("&H" & tem)
MSComm1.Output = OutBuffer
End Select
HData = ""
End Sub
Sub kk()
Dim m, k, l As Variant
delay 200
TextBox3.Text = "2.886" 'Format(Reading(0), "0.000")
cishu = 1
m = Val(TextBox3.Text) * Val(TextBox10.Text) / (Val(TextBox2.Text) - Val(TextBox3.Text)) '桥路阻抗
k = Val(TextBox6.Text) / Val(TextBox9.Text) * (Val(TextBox2.Text) - Val(TextBox1.Text)) 'S测
l = (Val(TextBox8.Text) - Val(TextBox7.Text)) '目标值
TextBox5.Text = Format(((m * k - m * l) / l + Val(TextBox4.Text)), "0.000")
ActiveCell.Offset(1, 0).Select
ActiveWorkbook.Save
HData = ""
End Sub
Private Sub MSComm1_OnComm() '接收数据
On Error Resume Next
Dim BytesReceived() As Byte
Dim buffer As String
Dim i As Integer
Select Case MSComm1.CommEvent
Case comEvReceive '接收十六进制数据。并以十六进制显示
MSComm1.InputLen = 0
buffer = MSComm1.Input '接收数据至字符串中
BytesReceived() = buffer '将数据转入Byte数组中
For i = 0 To UBound(BytesReceived) '显示结果以十六进制显示
If Len(Hex(BytesReceived(i))) = 1 Then
HData = HData & "0" & Hex(BytesReceived(i))
Else
HData = HData & Hex(BytesReceived(i))
End If
'ActiveSheet.Range(ActiveCell.Address) = HData
' ActiveCell.Offset(1, 0).Select
'最后将结果后入Text1中
MSComm1.OutBufferCount = 0 '清除发送缓冲区
MSComm1.InBufferCount = 0 '清除接收缓冲区
'MSComm1.PortOpen = False
Next
End Select
If HData = "80" Then
ActiveSheet.Range(ActiveCell.Address) = HData
ActiveCell.Offset(1, 0).Select
'HData = ""
caiji
ElseIf HData = "90" Then
ActiveSheet.Range(ActiveCell.Address) = HData
ActiveCell.Offset(1, 0).Select
HData = ""
kk
' Else
'Exit Sub
End If
End Sub
怎么就case 2 下面的95 10 20 25 发不出去呢， TextBox2.Text = "4.5"这句话执行了的啊
[解决办法]
lz确定mscomm的串口参数设置于单片机上的设置一样么？还有，你确定你能收到正确的数据么？你在接收的时候，inputmode设置的是多少？如果接收十六进制数，参数应该设置为1.然后接收缓冲区buffer设置为Variant类型。
另外
tem = 95
OutBuffer(0) = Val("&H" & tem)
tem = 10
OutBuffer(1) = Val("&H" & tem)
tem = 20
OutBuffer(2) = Val("&H" & tem)
tem = 25
OutBuffer(3) = Val("&H" & tem)
可以改成
OutBuffer(0) = &h95
OutBuffer(1) = &h10
OutBuffer(2) = &h20
OutBuffer(3) = &h25
VBA与vb6实际上都是调用的相同的串口控件。没有区别。
