```c
#include <stdio.h>
#include <stdlib.h>
#include <usb.h>
 
int main() {
    struct usb_bus *bus;
    struct usb_device *dev;
    usb_init();
    usb_find_busses();
    usb_find_devices();
 
    for(bus = usb_get_busses(); bus; bus = bus->next) {
        for(dev = bus->devices; dev; dev = dev->next) {
            printf("Device: %04x:%04x, bcdUSB: %04x\n",
                dev->descriptor.idVendor,
                dev->descriptor.idProduct,
                dev->descriptor.bcdUSB);
        }
    }
    return 0;
}
```