USB上位机开发

article/2025/9/26 16:54:38

上位机开发采用图形化界面，使用C#语言进行开发。调用C++编写的Dll动态库，实现与STM32进行USB通信的目的。

首先，编写Dll动态库。
开发环境采用VS2017，语言C++
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将lusb0_usb.h和libusb.lib文件拷贝到工程目录下。
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libusb-win32-bin-1.2.6.0下载地址

拷贝后，在项目属性 -》VC++目录 -》库目录添加刚才拷贝后文件路径
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项目属性 -》链接器 -》输入 -》附加依赖项添加libusb.lib，如图所示

Dll2.cpp引入添加的头文件lusb_usb.h

// Dll1.cpp : 定义 DLL 应用程序的导出函数。
//#include "stdafx.h"
#include "Dll2.h"
#include "lusb0_usb.h"#include <iostream>
#define PID 0x6668
#define VID 0x8886using namespace std;usb_dev_handle * my_device;int __stdcall Find_MyDevice()
{usb_init();usb_find_busses();usb_find_devices();struct usb_bus * bus;for (bus = usb_busses; bus; bus->next){struct usb_device * device;for (device = bus->devices; device; device->next){if (device->descriptor.idProduct == PID&& device->descriptor.idVendor == VID){//cout << "find my device" << endl;my_device = usb_open(device);int ret = usb_claim_interface(my_device, 0);//cout << "usb_claim_interface:" << ret << endl;return 1;}else{return -1;}}}}int __stdcall USB_BulkWrite(int ep, char *bytes, int size, int timeout)
{int ret = 0;ret = usb_bulk_write(my_device, ep, bytes, size, timeout);return ret;
}int __stdcall USB_BulkRead(int ep, char *bytes, int size, int timeout)
{int ret = 0;ret = usb_bulk_read(my_device, ep, bytes, size, timeout);return ret;
}

在cpp文件中，实现了三个函数，Find_MyDevice， USB_BulkWrite，USB_BulkRead
在Dll2.h文件中：

#pragma once
#ifdef DLL2_EXPORTS
#define USB_DRIVES_API __declspec(dllexport)
#else
#define USB_DRIVES_API __declspec(dllimport)
#endifextern "C"  USB_DRIVES_API int  __stdcall Find_MyDevice();
extern "C"  USB_DRIVES_API int  __stdcall USB_BulkWrite(int ep, char *bytes, int size, int timeout);
extern "C"  USB_DRIVES_API int  __stdcall USB_BulkRead(int ep, char *bytes, int size, int timeout);

声明这三个函数是用于导出的__declspec(dllexport)，extern "C"是说明是以C语言格式
宏定义DLL2_EXPORTS在VS中默认已经定义好
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然后点击生成 -》生成解决方案。在Debug文件夹下生成了Dll文件。

然后新建一个工程，编写界面，语言C#

将Dll2.dll拷贝到此工程目录下

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace WindowsFormsUSB
{public partial class Form1 : Form{bool param_set = false;UInt32 counter = 0;float[] data = new float[100];UInt32 x = 0;[DllImport("Dll2.dll", EntryPoint = "Find_MyDevice", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]public static extern int Find_MyDevice();[DllImport("Dll2.dll", EntryPoint = "USB_BulkWrite", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]public static extern int USB_BulkWrite(int ep, ref byte bytes, int size, int timeout);[DllImport("Dll2.dll", EntryPoint = "USB_BulkRead", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]public static extern int USB_BulkRead(int ep, ref byte bytes, int size, int timeout);