2 #include <ucw/unaligned.h>
9 #include <libusb-1.0/libusb.h>
11 struct libusb_context *usb_ctxt;
12 struct libusb_device_handle *devh;
14 static libusb_device *find_device(void)
16 libusb_device **devlist;
17 ssize_t devn = libusb_get_device_list(usb_ctxt, &devlist);
20 fprintf(stderr, "Cannot enumerate USB devices: error %d\n", (int) devn);
24 for (ssize_t i=0; i<devn; i++)
26 struct libusb_device_descriptor desc;
27 libusb_device *dev = devlist[i];
28 if (!libusb_get_device_descriptor(dev, &desc))
30 if (desc.idVendor == 0x4242 && desc.idProduct == 0x0001)
32 printf("Found device at usb%d.%d\n", libusb_get_bus_number(dev), libusb_get_device_address(dev));
33 // FIXME: Free device list
39 libusb_free_device_list(devlist, 1);
40 fprintf(stderr, "Device not found\n");
47 if (err = libusb_init(&usb_ctxt))
49 fprintf(stderr, "Cannot initialize libusb: error %d\n", err);
52 libusb_set_debug(usb_ctxt, 3);
54 libusb_device *dev = find_device();
56 if (err = libusb_open(dev, &devh))
58 fprintf(stderr, "Cannot open device: error %d\n", err);
61 libusb_reset_device(devh);
62 if (err = libusb_claim_interface(devh, 0))
64 fprintf(stderr, "Cannot claim interface: error %d\n", err);
70 time_t t = time(NULL);
71 struct tm *tm = localtime(&t);
73 unsigned char req[8] = {
76 (tm->tm_sec % 2 ? 10 : 0xff),
81 if (err = libusb_bulk_transfer(devh, 0x01, req, 8, &transferred, 2000))
82 die("Transfer failed: error %d\n", err);
83 // printf("Transferred %d bytes\n", transferred);
85 unsigned char resp[64];
87 if (err = libusb_bulk_transfer(devh, 0x82, resp, 64, &received, 2000))
88 die("Receive failed: error %d\n", err);
89 // printf("Received %d bytes\n", received);
92 int t = get_u32_be(resp);
93 int p = get_u32_be(resp + 4);
94 uint cnt = get_u32_be(resp + 8);
95 msg(L_INFO, "Temperature %d ddegC, pressure %d Pa, cnt %u", t, p, cnt);