使用libUSB-win32的简单读写例程参考

USB上位机程序的编写，函数的调用过程.

调用 void usb_init(void); 进行初始化
调用usb_find_busses、usb_find_devices和usb_get_busses这三个函数，获得已找到的USB总线序列；然后通过链表遍历所有的USB设备，根据已知的要打开USB设备的ID（VID/PID），找到相应的USB设备.
调用usb_open函数打开该USB设备
usb_set_configuration(m_dev_handle, 1) //设置配置
intint usb_claim_interface(usb_dev_handle *dev, int interface); 注册与操作系统通信的接口，这个函数必须被调用，因为只有注册接口，才能做相应的操作。
与USB设备进行通信。使用写入函数 int usb_bulk_write(usb_dev_handle *dev, int ep, char *bytes, int size, int timeout);
int usb_bulk_read(usb_dev_handle *dev, int ep, char *bytes, int size, int timeout);//批量读取从USB设备读取(接收)数据或向其写入(发送)数据。
int usb_release_interface(usb_dev_handle *dev, int interface); //注销被usb_claim_interface函数调用后的接口，释放资源，和usb_claim_interface对应使用。

int usb_close(usb_dev_handle *dev);//与usb_open相对应，关闭设备，是必须调用的, 返回0成功，<0 失败。

#include <stdio.h>
#include <string.h>
#include <iostream>
#include "conio.h"
#include "lusb0_usb.h"
#pragma comment(lib, "libusb.lib")

#define m_dev_VID 0x1483 /* Vendor ID of the m_dev /
#define m_dev_PID 0x5751 / Product ID of the m_dev */
#define EP1_OUT_SIZE 63 //可根据设备修改大小
#define EP1_IN_SIZE 63

int main(int argc, char *argv[])
{
struct usb_device * m_dev = NULL;
struct usb_dev_handle *m_dev_handle;
char str[64];
memset(str,0,sizeof(str));

复制代码

     usb_init(); 
     usb_find_busses(); 
     usb_find_devices(); 
     
 struct usb_bus *bus; 
     for(bus = usb_get_busses(); bus; bus = bus->next) 
     { 
             struct usb_device *dev; 
             for(dev = bus->devices; dev; dev = dev->next) 
             { 
                     if(dev->descriptor.idVendor == m_dev_VID && dev->descriptor.idProduct == m_dev_PID) 
                     m_dev=dev; 
             } 
     } 
     if(!m_dev) 
     { 
             printf("m_dev not found\n"); 
             return 1; 
     } 

     m_dev_handle = usb_open(m_dev); 
     if(!m_dev_handle) 
     { 
 		printf("Could not open m_dev\n"); 
 		return 1; 
     } 

     printf("设备打开成功!\n"); 
     if(usb_set_configuration(m_dev_handle, 1) < 0) 
     { 
             printf("Could not set configuration\n"); 
             usb_close(m_dev_handle); 
             return 1; 
     } 

     if(usb_claim_interface(m_dev_handle, 0) < 0) //claim_interface 0 注册与操作系统通信的接口 0
     { 
             printf("Could not claim interface\n"); 
             usb_close(m_dev_handle); 
             return 1; 
     } 


 //-----获取多个端点的地址-----------------------------
 int num_endpoint = m_dev->config->interface->altsetting->bNumEndpoints;

 for (int k = 0; k < num_endpoint; k++) {
     struct usb_endpoint_descriptor endpoint = m_dev->config->interface->altsetting->endpoint[k];
     int endpoint_address = endpoint.bEndpointAddress;
     printf("  Endpoint Address: 0x%02x\n", endpoint_address);
 }
 	
 //------------------------------------------------------------
 	
 char WriteTestData[2048] = {0};
 char ReadTestData[2048] = {0};
 for(int i = 0; i< 2048; i++)
 {
 	WriteTestData[i] = i;
 }
 	
 	//端点1写入数据
     int ret; 
 ret = usb_bulk_write(m_dev_handle, EP_OUT, WriteTestData, EP1_OUT_SIZE, 500);
 if(ret != EP1_OUT_SIZE)
 {
 	printf("端点1写入数据失败! %d\n", ret);
 	return 1;
 }
 else
 {
 	printf("端点1写入数据成功!\n");
 }

 //端点1读取数据
 ret = usb_bulk_read(m_dev_handle, EP_IN, ReadTestData, EP1_IN_SIZE, 500);
 if(ret != EP1_IN_SIZE)
 {
 	printf("端点1读取数据失败! %d\n", ret);
 	return 1;
 }
 else
 {
 	printf("端点1读取数据成功!\n");
 	for (int i = 0; i < EP1_IN_SIZE; i++)
 	{
 		printf("%02X ", ReadTestData[i]);
 		if(((i + 1) % 16) == 0)
 		{
 			printf("\n");
 		}
 	}
 	printf("\n");
 }


 /**************************************************************************/

     usb_release_interface(m_dev_handle, 0);		//注销接口，释放资源，和usb_claim_interface搭配使用。
     usb_close(m_dev_handle); 
     printf("\n设备关闭\n"); 

     return 0;

}

参考：使用libusb-win32库, 批量(bulk)传输方式, 编写上位机软件_编写上位机通讯软件实现usb device设备的批量数据下载及上传功能-CSDN博客

Qt下libusb-win32的使用(二)批量读写操作 - lknlfy - 博客园

上位机程序：libusb,bulk端点传输,上位机程序资源-CSDN文库