const unsigned int USB_VENDOR_ID = 0x6660;
const unsigned int USB_PRODUCT_ID = 0x0666;
const char USB_SELF_POWER = 0x80;            // Self powered 0xC0,  0x80 bus powered
const char USB_MAX_POWER = 50;               // Bus power required in units of 2 mA
const char HID_INPUT_REPORT_BYTES = 64;
const char HID_OUTPUT_REPORT_BYTES = 64;
const char USB_TRANSFER_TYPE = 0x03;         //0x03 Interrupt
const char EP_IN_INTERVAL = 1;
const char EP_OUT_INTERVAL = 1;

const char USB_INTERRUPT = 1;
const char USB_HID_EP = 1;
const char USB_HID_RPT_SIZE = 75;

/* Device Descriptor */
const struct {
    char bLength;               // bLength         - Descriptor size in bytes (12h)
    char bDescriptorType;       // bDescriptorType - The constant DEVICE (01h)
    unsigned int bcdUSB;        // bcdUSB          - USB specification release number (BCD)
    char bDeviceClass;          // bDeviceClass    - Class Code
    char bDeviceSubClass;       // bDeviceSubClass - Subclass code
    char bDeviceProtocol;       // bDeviceProtocol - Protocol code
    char bMaxPacketSize0;       // bMaxPacketSize0 - Maximum packet size for endpoint 0
    unsigned int idVendor;      // idVendor        - Vendor ID
    unsigned int idProduct;     // idProduct       - Product ID
    unsigned int bcdDevice;     // bcdDevice       - Device release number (BCD)
    char iManufacturer;         // iManufacturer   - Index of string descriptor for the manufacturer
    char iProduct;              // iProduct        - Index of string descriptor for the product.
    char iSerialNumber;         // iSerialNumber   - Index of string descriptor for the serial number.
    char bNumConfigurations;    // bNumConfigurations - Number of possible configurations
} device_dsc = {
      0x12,                   // bLength
      0x01,                   // bDescriptorType
      0x0200,                 // bcdUSB
      0x00,                   // bDeviceClass
      0x00,                   // bDeviceSubClass
      0x00,                   // bDeviceProtocol
      8,                      // bMaxPacketSize0
      USB_VENDOR_ID,          // idVendor
      USB_PRODUCT_ID,         // idProduct
      0x0001,                 // bcdDevice
      0x01,                   // iManufacturer
      0x02,                   // iProduct
      0x00,                   // iSerialNumber
      0x01                    // bNumConfigurations
  };

/* Configuration 1 Descriptor */
const char configDescriptor1[]= {
    // Configuration Descriptor
    0x09,                   // bLength             - Descriptor size in bytes
    0x02,                   // bDescriptorType     - The constant CONFIGURATION (02h)
    0x29,0x00,              // wTotalLength        - The number of bytes in the configuration descriptor and all of its subordinate descriptors
    1,                      // bNumInterfaces      - Number of interfaces in the configuration
    1,                      // bConfigurationValue - Identifier for Set Configuration and Get Configuration requests
    0,                      // iConfiguration      - Index of string descriptor for the configuration
    USB_SELF_POWER,         // bmAttributes        - Self/bus power and remote wakeup settings
    USB_MAX_POWER,          // bMaxPower           - Bus power required in units of 2 mA

    // Interface Descriptor
    0x09,                   // bLength - Descriptor size in bytes (09h)
    0x04,                   // bDescriptorType - The constant Interface (04h)
    0,                      // bInterfaceNumber - Number identifying this interface
    0,                      // bAlternateSetting - A number that identifies a descriptor with alternate settings for this bInterfaceNumber.
    2,                      // bNumEndpoint - Number of endpoints supported not counting endpoint zero
    0x03,                   // bInterfaceClass - Class code
    0,                      // bInterfaceSubclass - Subclass code
    0,                      // bInterfaceProtocol - Protocol code
    0,                      // iInterface - Interface string index

    // HID Class-Specific Descriptor
    0x09,                   // bLength - Descriptor size in bytes.
    0x21,                   // bDescriptorType - This descriptor's type: 21h to indicate the HID class.
    0x01,0x01,              // bcdHID - HID specification release number (BCD).
    0x00,                   // bCountryCode - Numeric expression identifying the country for localized hardware (BCD) or 00h.
    1,                      // bNumDescriptors - Number of subordinate report and physical descriptors.
    0x22,                   // bDescriptorType - The type of a class-specific descriptor that follows
    USB_HID_RPT_SIZE,0x00,  // wDescriptorLength - Total length of the descriptor identified above.

    // Endpoint Descriptor
    0x07,                   // bLength - Descriptor size in bytes (07h)
    0x05,                   // bDescriptorType - The constant Endpoint (05h)
    USB_HID_EP | 0x80,      // bEndpointAddress - Endpoint number and direction
    USB_TRANSFER_TYPE,      // bmAttributes - Transfer type and supplementary information    
    0x40,0x00,              // wMaxPacketSize - Maximum packet size supported
    EP_IN_INTERVAL,         // bInterval - Service interval or NAK rate

    // Endpoint Descriptor
    0x07,                   // bLength - Descriptor size in bytes (07h)
    0x05,                   // bDescriptorType - The constant Endpoint (05h)
    USB_HID_EP,             // bEndpointAddress - Endpoint number and direction
    USB_TRANSFER_TYPE,      // bmAttributes - Transfer type and supplementary information
    0x40,0x00,              // wMaxPacketSize - Maximum packet size supported    
    EP_OUT_INTERVAL         // bInterval - Service interval or NAK rate
};

const struct {
  char report[USB_HID_RPT_SIZE];
}hid_rpt_desc =
  {
     {0x05, 0x0c,                    // USAGE_PAGE (Consumer Devices)
    0x09, 0x01,                    // USAGE (Consumer Control)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x09, 0x01,                    //   USAGE (Consumer Control)
    0xa1, 0x02,                    //   COLLECTION (Logical)
    0x85, 0x01,                    //     REPORT_ID (1)
    0x15, 0x00,                    //     LOGICAL_MINIMUM (0)
    0x25, 0x01,                    //     LOGICAL_MAXIMUM (1)
    0x09, 0xe9,                    //     USAGE (Volume Up)
    0x09, 0xea,                    //     USAGE (Volume Down)
    0x09, 0xe2,                    //     USAGE (Mute)
    0x75, 0x01,                    //     REPORT_SIZE (1)
    0x95, 0x03,                    //     REPORT_COUNT (3)
    0x81, 0x06,                    //     INPUT (Data,Var,Rel)
    0x95, 0x05,                    //     REPORT_COUNT (5)
    0x81, 0x07,                    //     INPUT (Cnst,Var,Rel)
    0xc0,                          //   END_COLLECTION
    0xc0,                          // END_COLLECTION
    0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
    0x09, 0x06,                    // USAGE (Keyboard)
    0xa1, 0x01,                    // COLLECTION (Application)
    0x85, 0x02,                    //   REPORT_ID (2)
    0x05, 0x07,                    //   USAGE_PAGE (Keyboard)
    0x19, 0xe0,                    //   USAGE_MINIMUM (Keyboard LeftControl)
    0x29, 0xe7,                    //   USAGE_MAXIMUM (Keyboard Right GUI)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x25, 0x01,                    //   LOGICAL_MAXIMUM (1)
    0x75, 0x01,                    //   REPORT_SIZE (1)
    0x95, 0x08,                    //   REPORT_COUNT (8)
    0x81, 0x02,                    //   INPUT (Data,Var,Abs)
    0x95, 0x06,                    //   REPORT_COUNT (6)
    0x75, 0x08,                    //   REPORT_SIZE (8)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x25, 0x65,                    //   LOGICAL_MAXIMUM (101)
    0x05, 0x07,                    //   USAGE_PAGE (Keyboard)
    0x19, 0x00,                    //   USAGE_MINIMUM (Reserved (no event indicated))
    0x29, 0x65,                    //   USAGE_MAXIMUM (Keyboard Application)
    0x81, 0x00,                    //   INPUT (Data,Ary,Abs)
    0xc0}                          // END_COLLECTION
  };

//Language code string descriptor
const struct {
  char bLength;
  char bDscType;
  unsigned int string[1];
  } strd1 = {
      4,
      0x03,
      {0x0409}
    };


//Manufacturer string descriptor
const struct{
  char bLength;
  char bDscType;
  unsigned int string[12];
  }strd2={
    26,           //sizeof this descriptor string
    0x03,
    {'S','u','n','s','o','f','t',' ','I','n','c','.'}
  };

//Product string descriptor
const struct{
  char bLength;
  char bDscType;
  unsigned int string[11];
}strd3={
    24,          //sizeof this descriptor string
    0x03,
    {'I','R',' ','R','e','c','e','i','v','e','r'}
 };

//Array of configuration descriptors
const char* USB_config_dsc_ptr[1];

//Array of string descriptors
const char* USB_string_dsc_ptr[3];

void USB_Init_Desc(){
  USB_config_dsc_ptr[0] = &configDescriptor1;
  USB_string_dsc_ptr[0] = (const char*)&strd1;
  USB_string_dsc_ptr[1] = (const char*)&strd2;
  USB_string_dsc_ptr[2] = (const char*)&strd3;
}