【发布时间】：2018-12-18 15:36:51
【问题描述】：
我目前正在 Visual Studio 上的 c# 中使用 Microchip 的 USB 设备 MCP2210 开发一个项目。我正在使用 .Net v4 和 Microchip 发布的 mcp2210_dll_dotnetv4_x86.dll。不幸的是，我很难理解为什么我在连接到 HID 设备时遇到问题。我的问题来自电话
D1.Handle = MCP2210.M_Mcp2210_OpenByIndex(D1.VID, D1.PID, i-1, null)
它在第 84 行。响应是错误 -106，设备已连接。这很好，但我需要将它与这个函数调用连接起来以接收正确的句柄。如果我更改索引（当前为 i-1），我会收到 -101 错误，该索引处没有设备。有没有人建议诊断或解决这个问题？下面贴出项目代码
using mcp2210_dll_m;
using System;
using System.Text;
namespace HID_Command_Line
{
public struct Device
{
public ushort PID { get; set; }
public ushort VID { get; set; }
public IntPtr Handle { get; set; }
public Device (ushort vid, ushort pid, IntPtr handle)
{
VID = vid;
PID = pid;
Handle = handle;
}
}
class Program
{
static void Main(string[] args)
{
byte[] Command = new byte[64];
string temp;
ConsoleKeyInfo code;
temp = ReadCommand();
do
{
Command = Converter.ToByteArray(temp);
Converter.CheckByteArray(Command);
code = Console.ReadKey();
Console.Write("\r\n");
if (code.Key == ConsoleKey.Y)
{
if (ConnectUSB() == true)
{
// SetUpDeviceSettings();
}
}
else if (code.Key == ConsoleKey.N)
{
temp = ReadCommand();
}
} while (code.Key != ConsoleKey.Escape);
Console.WriteLine("Exited Correctly");
}
public static string ReadCommand()
{
string temp;
Console.WriteLine("Please Enter the Command in Hex Format");
//Console.WriteLine(" Type Cntrl + Space for Nul ");
temp = Console.ReadLine();
int length = temp.Length / 2;
for (int i = length; i < 64; i++)
{
temp += "00";
}
return temp;
}
public static bool ConnectUSB()
{
bool confirmation = false;
Device D1 = new Device(0x04D8, 0x00DE, (IntPtr)null);
uint i = (uint) MCP2210.M_Mcp2210_GetConnectedDevCount(D1.VID, D1.PID);
if (i == 1)
{
Console.WriteLine("yeah Baby, Press any Button to Connect to Single Devices in your Area"); //assuming that the index for 1 device is always 0
Console.Read();
D1.Handle = MCP2210.M_Mcp2210_OpenByIndex(D1.VID, D1.PID, i-1, null);
Console.WriteLine("Handle is {0}", D1.Handle);
int Error = MCP2210.M_Mcp2210_GetLastError();
Console.WriteLine("Response is {0} \r\n", Error);
switch (Error)
{
case -101:
{
Console.WriteLine("Error, No Such Index Exists");
break;
}
case -103:
{
Console.WriteLine("Error, Device Not Found");
break;
}
case -104:
{
Console.WriteLine("Error, Internal Buffer too small");
break;
}
case -105:
{
Console.WriteLine("Error, Open Device Error");
break;
}
case -106:
{
Console.WriteLine("Error, Device Already Connected");
confirmation = true;
break;
}
case -20:
{
Console.WriteLine("Error, MALLOC Unsucessful");
break;
}
case -10:
{
Console.WriteLine("Error, NULL Returned");
break;
}
case -1:
{
Console.WriteLine("Error, Unknown Error");
break;
}
case 0:
{
Console.WriteLine("Success");
confirmation = true;
break;
}
}
}
else if (i > 1)
{
Console.WriteLine("To Many Devices Connected. Only one is to be run at a time \r\n");
Console.Read();
}
else
{
Console.WriteLine("System does not register the device. Please connect the device");
}
return confirmation;
}
// public static SetUpDeviceSettings()
// {
// return;
// }
}
static class Converter
{
public static void CheckByteArray(byte[] bytes)
{
var convert = new StringBuilder("Is this command correct[] { ");
foreach (var b in bytes)
{
convert.Append(b + ", ");
}
convert.Append("} \r\n [y]es, [n]o or Escape to Exit \r\n");
Console.WriteLine(convert.ToString());
}
public static byte[] ToByteArray(String HexString)
{
int NumberChars = HexString.Length;
byte[] bytes = new byte[NumberChars / 2];
for (int i = 0; i < NumberChars; i += 2)
{
bytes[i / 2] = Convert.ToByte(HexString.Substring(i, 2), 16);
}
return bytes;
}
}
}
【问题讨论】：