3 #include <libusb-1.0/libusb.h>
5 struct libusb_context *usb_ctxt;
6 struct libusb_device_handle *devh;
8 static libusb_device *find_device(void)
10 libusb_device **devlist;
11 ssize_t devn = libusb_get_device_list(usb_ctxt, &devlist);
14 fprintf(stderr, "Cannot enumerate USB devices: error %d\n", (int) devn);
18 for (ssize_t i=0; i<devn; i++)
20 struct libusb_device_descriptor desc;
21 libusb_device *dev = devlist[i];
22 if (!libusb_get_device_descriptor(dev, &desc))
24 if (desc.idVendor == 0x4242 && desc.idProduct == 0x0001)
26 printf("Found device at usb%d.%d\n", libusb_get_bus_number(dev), libusb_get_device_address(dev));
27 // FIXME: Free device list
33 libusb_free_device_list(devlist, 1);
34 fprintf(stderr, "Device not found\n");
41 if (err = libusb_init(&usb_ctxt))
43 fprintf(stderr, "Cannot initialize libusb: error %d\n", err);
46 libusb_set_debug(usb_ctxt, 3);
48 libusb_device *dev = find_device();
50 if (err = libusb_open(dev, &devh))
52 fprintf(stderr, "Cannot open device: error %d\n", err);
55 libusb_reset_device(devh);
56 if (err = libusb_claim_interface(devh, 0))
58 fprintf(stderr, "Cannot claim interface: error %d\n", err);
64 unsigned char req[64] = { 1, 2, 3, 4 };
66 if (err = libusb_bulk_transfer(devh, 0x01, req, 32, &transferred, 2000))
68 fprintf(stderr, "Transfer failed: error %d\n", err);
71 printf("Transferred %d bytes\n", transferred);
74 unsigned char resp[1000];
76 if (err = libusb_bulk_transfer(devh, 0x81, resp, 1000, &received, 2000))
78 fprintf(stderr, "Receive failed: error %d\n", err);
81 printf("Received %d bytes [%02x]\n", received, resp[0]);