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(1);
    } 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(320, 240);
}

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 0;
}

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。