Transfer and read data from microcontroller using libusb?

Question

Microcontrollers

QMessageBox *msg = new QMessageBox(this);
 
    
    unsigned char input[] = {0x10};
 
    libusb_init(NULL);
    libusb_device_handle *dev = libusb_open_device_with_vid_pid(NULL, device->getVID(), device->getPID());
 
    if(dev == NULL) {
 
        msg->setText("Device no Find");
        msg->show();
 
        return; }
 
    int transferred;
    int ret;
    if (libusb_kernel_driver_active(dev,0))
            libusb_detach_kernel_driver(dev,0);
        if ((ret = libusb_set_configuration(dev, 1)) < 0)
        {
            msg->setText("Ошибка");
            msg->show();
        }
        if (libusb_claim_interface(dev, 0) < 0)
        {
            msg->setText("Ошибка");
            msg->show();
        }
 
     
   ret = libusb_interrupt_transfer(dev, 0x01, input, sizeof(input), &transferred, 1000);
 
    if (ret < 0){
 
        msg->setText("Ошибка");
        msg->show();
    }
 
     libusb_attach_kernel_driver(dev, 0);
     libusb_release_interface(dev, 0);
     libusb_close(dev); 
     libusb_exit(NULL); 
 
 
     msg->setText(QString(input[0]));
     msg->show();

here is the code for sending data, the code works and does not give any error, but the data does not come, I try to change the breakpoint to IN to get the data, the reaction is the same. Although Keil's trivial example of lighting the LEDs on this device works

Answer 1

Study this guide: habrahabr.ru/post/261955
And in fact, it’s difficult to talk about something without USB descriptors (on Linux: lsusb -v, on Windows: UsbView). Well, check that you really use interrupt transfer and that the code on the device itself is correct.
And so, I don’t see any crime: transfer to the device, which means EP OUT, you have it EP1, which means 0x01. So most likely the problem is on the device. Try, for a start, control transfering.