Qt下libusb-win32的使用(一)打印设备描述符

主要是在前一篇的基础上，学习libusb-win32的API使用。程序很简单，就是打印指定USB设备的设备描述符(当然其他描述符也是可以的)。

 #include "testlibusb.h"

 #define MY_VID 0x5345
 #define MY_PID 0x1234

 USB::USB()
 {
     usb_init(); /* initialize the library */
     //usb_set_debug(255);
     usb_find_busses(); /* find all busses */
     usb_find_devices(); /* find all connected devices */

     if (!(udev = open_dev())) {
         qDebug("error opening device: %s", usb_strerror());
         exit();
     } else
         qDebug("open success: device %04X:%04X opened", MY_VID, MY_PID);

     printf_device_descriptor(&dev->descriptor);
     usb_close(udev);

     //my_usb_get_device_list();
     resize(, );
 }

 usb_dev_handle *USB::open_dev(void)
 {
     struct usb_bus *bus;
     //struct usb_device *dev;

     for(bus = usb_get_busses(); bus; bus = bus->next) {
         for(dev = bus->devices; dev; dev = dev->next) {
             if((dev->descriptor.idVendor == MY_VID) && (dev->descriptor.idProduct == MY_PID)) {
                     return usb_open(dev);
             }
         }
     }
     return ;
 }

 void USB::printf_device_descriptor(usb_device_descriptor *desc)
 {
         qDebug("bLength:             %u",     desc->bLength);
         qDebug("bDescriptorType:     %02Xh",  desc->bDescriptorType);
         qDebug("bcdUSB:              %04Xh",  desc->bcdUSB);
         qDebug("bDeviceClass:        %02Xh",  desc->bDeviceClass);
         qDebug("bDeviceSubClass:     %02Xh",  desc->bDeviceSubClass);
         qDebug("bDeviceProtocol:     %02Xh",  desc->bDeviceProtocol);
         qDebug("bMaxPacketSize0:     %02Xh",  desc->bMaxPacketSize0);
         qDebug("idVendor:            %04Xh",  desc->idVendor);
         qDebug("idProduct:           %04Xh",  desc->idProduct);
         qDebug("bcdDevice:           %04Xh",  desc->bcdDevice);
         qDebug("iManufacturer:       %u",     desc->iManufacturer);
         qDebug("iProduct:            %u",     desc->iProduct);
         qDebug("iSerialNumber:       %u",     desc->iSerialNumber);
         qDebug("bNumConfigurations:  %u",     desc->bNumConfigurations);
 }

这里我指定的USB设备是Tiny6410开发板。运行效果如下：

下一步就是上位机与开发板进行数据互传。