дескриптор репорта Опции

[sergey sva]

Смотрю пример hid из Keil,не понятно почему многие поля повторяются,
например HID_ReportSize(1), или HID_LogicalMin(0) ?

Код

/* HID Report Descriptor */
const BYTE HID_ReportDescriptor[] = {
  HID_UsagePageVendor(0x00),
  HID_Usage(0x01),
  HID_Collection(HID_Application),
    HID_UsagePage(HID_USAGE_PAGE_BUTTON),
    HID_UsageMin(1),
    HID_UsageMax(4),
    HID_LogicalMin(0),
    HID_LogicalMax(1),
    HID_ReportCount(4),
    HID_ReportSize(1),
    HID_Input(HID_Data | HID_Variable | HID_Absolute),
    HID_ReportCount(1),
    HID_ReportSize(4),
    HID_Input(HID_Constant),
    HID_UsagePage(HID_USAGE_PAGE_LED),
    HID_Usage(HID_USAGE_LED_GENERIC_INDICATOR),
    HID_LogicalMin(0),
    HID_LogicalMax(1),
    HID_ReportCount(8),
    HID_ReportSize(1),
    HID_Output(HID_Data | HID_Variable | HID_Absolute),
  HID_EndCollection,
};