USB对命令描述符的解析

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/* command host --> device */
    0x85, 0x02,            /*     REPORT_ID 2          */    命令的第一个字节为 0x02
    0x09, 0x06,            /*     USAGE (command)         */
    0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */
    0x26, 0xff, 0x00,       /*     LOGICAL_MINIMUM (255)     */
    0x75, 0x08,            /*     REPORT_SIZE (8)            */
    0x95, 0x04,            /*     REPORT_COUNT (4)           */        描述的大小为4个字节
    0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */

    0x85, 0x02,            /*     REPORT_ID 2               */
    0x09, 0x08,            /*     USAGE (command)           */
    0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol) */

/* command host --> device */
    0x85, 0x06,            /*     REPORT_ID 6          */
    0x09, 0x06,            /*     USAGE (command)         */
    0x15, 0x00,            /*     LOGICAL_MINIMUM (0)        */
    0x26, 0xff, 0x00,       /*     LOGICAL_MINIMUM (255)     */
    0x75, 0x08,            /*     REPORT_SIZE (8)            */
    0x95, 0x08,            /*     REPORT_COUNT (8)           */         描述的大小为8个字节
    0xB1, 0x82,             /*    FEATURE (Data,Var,Abs,Vol) */

    0x85, 0x06,            /*     REPORT_ID 6               */
    0x09, 0x08,            /*     USAGE (command)           */
    0x91, 0x82,            /*     OUTPUT (Data,Var,Abs,Vol) */

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