gistfile1.c

const struct __attribute__((__packed__, aligned (4))) {
    uint8_t bLength, bDescriptorType;
    uint8_t bcdUSBL, bcdUSBH;
    uint8_t bDeviceClass, bDeviceSubClass, bDeviceProtocol, bMaxPacketSize;
    uint8_t idVendorL, idVendorH;
    uint8_t idProductL, idProductH;
    uint8_t bcdDeviceL, bcdDeviceH;
    uint8_t iManufacturer, iProduct, iSerialNumber;
    uint8_t bNumConfigurations;
} deviceDescriptor = {
        .bLength = (uint8_t) sizeof(deviceDescriptor),
        .bDescriptorType = USB_DEVICE_DESCRIPTOR_TYPE,
        .bcdUSBL = 0x00,
        .bcdUSBH = 0x02,
        .bDeviceClass = 0x00,
        .bDeviceSubClass = 0x00,
        .bDeviceProtocol = 0x00,
        .bMaxPacketSize = USB_OTG_MAX_EP0_SIZE,
        .idVendorL = LOBYTE(USBD_VID),
        .idVendorH = HIBYTE(USBD_VID),
        .idProductL = LOBYTE(USBD_PID),
        .idProductH = HIBYTE(USBD_PID),
        .bcdDeviceL= 0x00,
        .bcdDeviceH = 0x02,
        .iManufacturer = USBD_IDX_MFC_STR,
        .iProduct = USBD_IDX_PRODUCT_STR,
        .iSerialNumber = USBD_IDX_SERIAL_STR,
        .bNumConfigurations = USBD_CFG_MAX_NUM};