' 定义变量
Dim Row(4) As Byte ' 定义一个长度为4的字节数组,用于存储每行的扫描码
Dim Ar(4) As Byte ' 定义一个长度为4的字节数组,用于存储发送给1-Wire设备的命令和数据
Dim a As Byte ' 定义一个字节变量a,用于临时存储数据
Dim Key As Byte ' 定义一个字节变量Key,用于存储检测到的按键值
Dim Rowlus As Byte ' 定义一个字节变量Rowlus,用于循环遍历每一行
1wwrite Ar(1), 4 ' 向1-Wire设备写入命令和数据
Ar(1) = 1wread(2) ' 从1-Wire设备读取响应(通常是按键的标识)
A = Ar(2) And &B00011110 ' 提取响应中的按键标识位
' 根据响应判断按键值
Select Case A
Case 30: Key = 0 ' 无按键按下
Case 28:
' 根据行号确定具体的按键值
If Rowlus = 1 Then Key = 16
If Rowlus = 2 Then Key = 9
If Rowlus = 3 Then Key = 8
If Rowlus = 4 Then Key = 7
Case 26:
If Rowlus = 1 Then Key = 15
If Rowlus = 2 Then Key = 6
If Rowlus = 3 Then Key = 5
If Rowlus = 4 Then Key = 4
Case 22:
If Rowlus = 1 Then Key = 14
If Rowlus = 2 Then Key = 3
If Rowlus = 3 Then Key = 2
If Rowlus = 4 Then Key = 1
Case 14:
If Rowlus = 1 Then Key = 13
If Rowlus = 2 Then Key = 12
If Rowlus = 3 Then Key = 11
If Rowlus = 4 Then Key = 10
Case Else: Key = 0 ' 其他情况视为无按键按下
End Select
' 如果检测到按键,则退出循环
If Key > 0 Then Exit For
Next Rowlus
Return ' 返回主程序