Demos/Device/LowLevel/GenericHID/Descriptors.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaims all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  USB Device Descriptors, for library use when in USB device mode. Descriptors are special
  34  *  computer-readable structures which the host requests upon device enumeration, to determine
  35  *  the device's capabilities and functions.
  36  */
  37
  38 #include "Descriptors.h"
  39
  40 /** HID class report descriptor. This is a special descriptor constructed with values from the
  41  *  USBIF HID class specification to describe the reports and capabilities of the HID device. This
  42  *  descriptor is parsed by the host and its contents used to determine what data (and in what encoding)
  43  *  the device will send, and what it may be sent back from the host. Refer to the HID specification for
  44  *  more details on HID report descriptors.
  45  */
  46 const USB_Descriptor_HIDReport_Datatype_t PROGMEM GenericReport[] =
  47 {
  48         HID_RI_USAGE_PAGE(16, 0xFF00), /* Vendor Page 0 */
  49         HID_RI_USAGE(8, 0x01), /* Vendor Usage 1 */
  50         HID_RI_COLLECTION(8, 0x01), /* Vendor Usage 1 */
  51             HID_RI_USAGE(8, 0x02), /* Vendor Usage 2 */
  52             HID_RI_LOGICAL_MINIMUM(8, 0x00),
  53             HID_RI_LOGICAL_MAXIMUM(8, 0xFF),
  54             HID_RI_REPORT_SIZE(8, 0x08),
  55             HID_RI_REPORT_COUNT(8, GENERIC_REPORT_SIZE),
  56             HID_RI_INPUT(8, HID_IOF_DATA | HID_IOF_VARIABLE | HID_IOF_ABSOLUTE),
  57             HID_RI_USAGE(8, 0x03), /* Vendor Usage 3 */
  58             HID_RI_LOGICAL_MINIMUM(8, 0x00),
  59             HID_RI_LOGICAL_MAXIMUM(8, 0xFF),
  60             HID_RI_REPORT_SIZE(8, 0x08),
  61             HID_RI_REPORT_COUNT(8, GENERIC_REPORT_SIZE),
  62             HID_RI_OUTPUT(8, HID_IOF_DATA | HID_IOF_VARIABLE | HID_IOF_ABSOLUTE | HID_IOF_NON_VOLATILE),
  63         HID_RI_END_COLLECTION(0),
  64 };
  65
  66 /** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall
  67  *  device characteristics, including the supported USB version, control endpoint size and the
  68  *  number of device configurations. The descriptor is read out by the USB host when the enumeration
  69  *  process begins.
  70  */
  71 const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
  72 {
  73         .Header                 = {.Size = sizeof(USB_Descriptor_Device_t), .Type = DTYPE_Device},
  74
  75         .USBSpecification       = VERSION_BCD(1,1,0),
  76         .Class                  = USB_CSCP_NoDeviceClass,
  77         .SubClass               = USB_CSCP_NoDeviceSubclass,
  78         .Protocol               = USB_CSCP_NoDeviceProtocol,
  79
  80         .Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
  81
  82         .VendorID               = 0x03EB,
  83         .ProductID              = 0x204F,
  84         .ReleaseNumber          = VERSION_BCD(0,0,1),
  85
  86         .ManufacturerStrIndex   = STRING_ID_Manufacturer,
  87         .ProductStrIndex        = STRING_ID_Product,
  88         .SerialNumStrIndex      = NO_DESCRIPTOR,
  89
  90         .NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
  91 };
  92
  93 /** Configuration descriptor structure. This descriptor, located in FLASH memory, describes the usage
  94  *  of the device in one of its supported configurations, including information about any device interfaces
  95  *  and endpoints. The descriptor is read out by the USB host during the enumeration process when selecting
  96  *  a configuration so that the host may correctly communicate with the USB device.
  97  */
  98 const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor =
  99 {
 100         .Config =
 101                 {
 102                         .Header                 = {.Size = sizeof(USB_Descriptor_Configuration_Header_t), .Type = DTYPE_Configuration},
 103
 104                         .TotalConfigurationSize = sizeof(USB_Descriptor_Configuration_t),
 105                         .TotalInterfaces        = 1,
 106
 107                         .ConfigurationNumber    = 1,
 108                         .ConfigurationStrIndex  = NO_DESCRIPTOR,
 109
 110                         .ConfigAttributes       = (USB_CONFIG_ATTR_RESERVED | USB_CONFIG_ATTR_SELFPOWERED),
 111
 112                         .MaxPowerConsumption    = USB_CONFIG_POWER_MA(100)
 113                 },
 114
 115         .HID_Interface =
 116                 {
 117                         .Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
 118
 119                         .InterfaceNumber        = INTERFACE_ID_GenericHID,
 120                         .AlternateSetting       = 0x00,
 121
 122                         .TotalEndpoints         = 2,
 123
 124                         .Class                  = HID_CSCP_HIDClass,
 125                         .SubClass               = HID_CSCP_NonBootSubclass,
 126                         .Protocol               = HID_CSCP_NonBootProtocol,
 127
 128                         .InterfaceStrIndex      = NO_DESCRIPTOR
 129                 },
 130
 131         .HID_GenericHID =
 132                 {
 133                         .Header                 = {.Size = sizeof(USB_HID_Descriptor_HID_t), .Type = HID_DTYPE_HID},
 134
 135                         .HIDSpec                = VERSION_BCD(1,1,1),
 136                         .CountryCode            = 0x00,
 137                         .TotalReportDescriptors = 1,
 138                         .HIDReportType          = HID_DTYPE_Report,
 139                         .HIDReportLength        = sizeof(GenericReport)
 140                 },
 141
 142         .HID_ReportINEndpoint =
 143                 {
 144                         .Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
 145
 146                         .EndpointAddress        = GENERIC_IN_EPADDR,
 147                         .Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
 148                         .EndpointSize           = GENERIC_EPSIZE,
 149                         .PollingIntervalMS      = 0x05
 150                 },
 151
 152         .HID_ReportOUTEndpoint =
 153                 {
 154                         .Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
 155
 156                         .EndpointAddress        = GENERIC_OUT_EPADDR,
 157                         .Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
 158                         .EndpointSize           = GENERIC_EPSIZE,
 159                         .PollingIntervalMS      = 0x05
 160                 }
 161 };
 162
 163 /** Language descriptor structure. This descriptor, located in FLASH memory, is returned when the host requests
 164  *  the string descriptor with index 0 (the first index). It is actually an array of 16-bit integers, which indicate
 165  *  via the language ID table available at USB.org what languages the device supports for its string descriptors.
 166  */
 167 const USB_Descriptor_String_t PROGMEM LanguageString = USB_STRING_DESCRIPTOR_ARRAY(LANGUAGE_ID_ENG);
 168
 169 /** Manufacturer descriptor string. This is a Unicode string containing the manufacturer's details in human readable
 170  *  form, and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
 171  *  Descriptor.
 172  */
 173 const USB_Descriptor_String_t PROGMEM ManufacturerString = USB_STRING_DESCRIPTOR(L"Dean Camera");
 174
 175 /** Product descriptor string. This is a Unicode string containing the product's details in human readable form,
 176  *  and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
 177  *  Descriptor.
 178  */
 179 const USB_Descriptor_String_t PROGMEM ProductString = USB_STRING_DESCRIPTOR(L"LUFA Generic HID Demo");
 180
 181 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
 182  *  documentation) by the application code so that the address and size of a requested descriptor can be given
 183  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
 184  *  is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
 185  *  USB host.
 186  */
 187 uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 188                                     const uint8_t wIndex,
 189                                     const void** const DescriptorAddress)
 190 {
 191         const uint8_t  DescriptorType   = (wValue >> 8);
 192         const uint8_t  DescriptorNumber = (wValue & 0xFF);
 193
 194         const void* Address = NULL;
 195         uint16_t    Size    = NO_DESCRIPTOR;
 196
 197         switch (DescriptorType)
 198         {
 199                 case DTYPE_Device:
 200                         Address = &DeviceDescriptor;
 201                         Size    = sizeof(USB_Descriptor_Device_t);
 202                         break;
 203                 case DTYPE_Configuration:
 204                         Address = &ConfigurationDescriptor;
 205                         Size    = sizeof(USB_Descriptor_Configuration_t);
 206                         break;
 207                 case DTYPE_String:
 208                         switch (DescriptorNumber)
 209                         {
 210                                 case STRING_ID_Language:
 211                                         Address = &LanguageString;
 212                                         Size    = pgm_read_byte(&LanguageString.Header.Size);
 213                                         break;
 214                                 case STRING_ID_Manufacturer:
 215                                         Address = &ManufacturerString;
 216                                         Size    = pgm_read_byte(&ManufacturerString.Header.Size);
 217                                         break;
 218                                 case STRING_ID_Product:
 219                                         Address = &ProductString;
 220                                         Size    = pgm_read_byte(&ProductString.Header.Size);
 221                                         break;
 222                         }
 223
 224                         break;
 225                 case HID_DTYPE_HID:
 226                         Address = &ConfigurationDescriptor.HID_GenericHID;
 227                         Size    = sizeof(USB_HID_Descriptor_HID_t);
 228                         break;
 229                 case HID_DTYPE_Report:
 230                         Address = &GenericReport;
 231                         Size    = sizeof(GenericReport);
 232                         break;
 233         }
 234
 235         *DescriptorAddress = Address;
 236         return Size;
 237 }
 238