Bootloaders/DFU/Descriptors.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2012  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 disclaim 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 /** Device descriptor structure. This descriptor, located in SRAM memory, describes the overall
  41  *  device characteristics, including the supported USB version, control endpoint size and the
  42  *  number of device configurations. The descriptor is read out by the USB host when the enumeration
  43  *  process begins.
  44  */
  45 const USB_Descriptor_Device_t DeviceDescriptor =
  46 {
  47         .Header                 = {.Size = sizeof(USB_Descriptor_Device_t), .Type = DTYPE_Device},
  48
  49         .USBSpecification       = VERSION_BCD(01.10),
  50         .Class                  = USB_CSCP_NoDeviceClass,
  51         .SubClass               = USB_CSCP_NoDeviceSubclass,
  52         .Protocol               = USB_CSCP_NoDeviceProtocol,
  53
  54         .Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
  55
  56         .VendorID               = 0x03EB,
  57         .ProductID              = PRODUCT_ID_CODE,
  58         .ReleaseNumber          = VERSION_BCD(00.00),
  59
  60         .ManufacturerStrIndex   = NO_DESCRIPTOR,
  61         .ProductStrIndex        = 0x01,
  62         .SerialNumStrIndex      = NO_DESCRIPTOR,
  63
  64         .NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
  65 };
  66
  67 /** Configuration descriptor structure. This descriptor, located in SRAM memory, describes the usage
  68  *  of the device in one of its supported configurations, including information about any device interfaces
  69  *  and endpoints. The descriptor is read out by the USB host during the enumeration process when selecting
  70  *  a configuration so that the host may correctly communicate with the USB device.
  71  */
  72 const USB_Descriptor_Configuration_t ConfigurationDescriptor =
  73 {
  74         .Config =
  75                 {
  76                         .Header                 = {.Size = sizeof(USB_Descriptor_Configuration_Header_t), .Type = DTYPE_Configuration},
  77
  78                         .TotalConfigurationSize = sizeof(USB_Descriptor_Configuration_t),
  79                         .TotalInterfaces        = 1,
  80
  81                         .ConfigurationNumber    = 1,
  82                         .ConfigurationStrIndex  = NO_DESCRIPTOR,
  83
  84                         .ConfigAttributes       = USB_CONFIG_ATTR_RESERVED,
  85
  86                         .MaxPowerConsumption    = USB_CONFIG_POWER_MA(100)
  87                 },
  88
  89         .DFU_Interface =
  90                 {
  91                         .Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
  92
  93                         .InterfaceNumber        = 0,
  94                         .AlternateSetting       = 0,
  95
  96                         .TotalEndpoints         = 0,
  97
  98                         .Class                  = 0xFE,
  99                         .SubClass               = 0x01,
 100                         .Protocol               = 0x02,
 101
 102                         .InterfaceStrIndex      = NO_DESCRIPTOR
 103                 },
 104
 105         .DFU_Functional =
 106                 {
 107                         .Header                 = {.Size = sizeof(USB_Descriptor_DFU_Functional_t), .Type = DTYPE_DFUFunctional},
 108
 109                         .Attributes             = (ATTR_CAN_UPLOAD | ATTR_CAN_DOWNLOAD),
 110
 111                         .DetachTimeout          = 0x0000,
 112                         .TransferSize           = 0x0C00,
 113
 114                         .DFUSpecification       = VERSION_BCD(01.01)
 115                 }
 116 };
 117
 118 /** Language descriptor structure. This descriptor, located in SRAM memory, is returned when the host requests
 119  *  the string descriptor with index 0 (the first index). It is actually an array of 16-bit integers, which indicate
 120  *  via the language ID table available at USB.org what languages the device supports for its string descriptors.
 121  */
 122 const USB_Descriptor_String_t LanguageString =
 123 {
 124         .Header                 = {.Size = USB_STRING_LEN(1), .Type = DTYPE_String},
 125
 126         .UnicodeString          = {LANGUAGE_ID_ENG}
 127 };
 128
 129 /** Product descriptor string. This is a Unicode string containing the product's details in human readable form,
 130  *  and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
 131  *  Descriptor.
 132  */
 133 const USB_Descriptor_String_t ProductString =
 134 {
 135         .Header                 = {.Size = USB_STRING_LEN(18), .Type = DTYPE_String},
 136
 137         .UnicodeString          = L"AVR DFU Bootloader"
 138 };
 139
 140 /** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors"
 141  *  documentation) by the application code so that the address and size of a requested descriptor can be given
 142  *  to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function
 143  *  is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the
 144  *  USB host.
 145  */
 146 uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 147                                     const uint8_t wIndex,
 148                                     const void** const DescriptorAddress)
 149 {
 150         const uint8_t  DescriptorType   = (wValue >> 8);
 151         const uint8_t  DescriptorNumber = (wValue & 0xFF);
 152
 153         const void* Address = NULL;
 154         uint16_t    Size    = NO_DESCRIPTOR;
 155
 156         switch (DescriptorType)
 157         {
 158                 case DTYPE_Device:
 159                         Address = &DeviceDescriptor;
 160                         Size    = sizeof(USB_Descriptor_Device_t);
 161                         break;
 162                 case DTYPE_Configuration:
 163                         Address = &ConfigurationDescriptor;
 164                         Size    = sizeof(USB_Descriptor_Configuration_t);
 165                         break;
 166                 case DTYPE_String:
 167                         if (!(DescriptorNumber))
 168                         {
 169                                 Address = &LanguageString;
 170                                 Size    = LanguageString.Header.Size;
 171                         }
 172                         else
 173                         {
 174                                 Address = &ProductString;
 175                                 Size    = ProductString.Header.Size;
 176                         }
 177
 178                         break;
 179         }
 180
 181         *DescriptorAddress = Address;
 182         return Size;
 183 }
 184