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1、USBHIDReport終極解析HID的報(bào)告描述符巨難懂，關(guān)鍵是數(shù)據(jù)格式與每一位代表的意思。經(jīng)過三天的研究，終于將HIDReport的每一個(gè)數(shù)據(jù)位的含義弄清楚了，現(xiàn)將數(shù)據(jù)解析如下，最后附上了一個(gè)HID通信的Report例子。以一個(gè)鍵盤的HIDReport為例：鍵盤的HID報(bào)告描述符：codecharKeyBoardReportDescriptor[63]={0x05,0x01,//USAGE_PAGE(GenericDesktop)0x09,0x06,//USAGE(Keyboard)0xa1,0x01,//COLLECTION(Application)0x05
2、,0x07,//USAGE_PAGE(Keyboard)0x19,0xe0,//USAGE_MINIMUM(KeyboardLeftControl)0x29,0xe7,//USAGE_MAXIMUM(KeyboardRightGUI)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)0x95,0x01,//REPORT_COUN
3、T(1)0x75,0x08,//REPORT_SIZE(8)0x81,0x03,//INPUT(Cnst,Var,Abs)0x95,0x05,//REPORT_COUNT(5)0x75,0x01,//REPORT_SIZE(1)0x05,0x08,//USAGE_PAGE(LEDs)0x19,0x01,//USAGE_MINIMUM(NumLock)0x29,0x05,//USAGE_MAXIMUM(Kana)0x91,0x02,//OUTPUT(Data,Var,Abs)0x95,0x01,//REPORT_COUNT(1)0x75,0x03,//REPORT
4、_SIZE(3)0x91,0x03,//OUTPUT(Cnst,Var,Abs)0x95,0x06,//REPORT_COUNT(6)0x75,0x08,//REPORT_SIZE(8)0x15,0x00,//LOGICAL_MINIMUM(0)0x25,0xFF,//LOGICAL_MAXIMUM(255)0x05,0x07,//USAGE_PAGE(Keyboard)0x19,0x00,//USAGE_MINIMUM(Reserved(noeventindicated))0x29,0x65,//USAGE_MAXIMUM(KeyboardApplicatio
5、n)0x81,0x00,//INPUT(Data,Ary,Abs)0xc0//END_COLLECTION};具體分析如下：codecharKeyBoardReportDescriptor[63]={0x05,0x01,//USAGE_PAGE(GenericDesktop)//分析根據(jù)HID短項(xiàng)目數(shù)據(jù)格式短項(xiàng)目的編碼形式如下：Bits23222120191817161514131211109876543210[data][data]bTagbTypebSize0x05=000001010000：UsagePage01：bType，全局（bType=0：主項(xiàng)目；
6、bType=1：全局項(xiàng)目；bType=2：區(qū)域項(xiàng)目；）01：bSize，1字節(jié)（BSize用來指出項(xiàng)目的數(shù)據(jù)所需字節(jié)的數(shù)目，該數(shù)目僅可以為0（當(dāng)bSize=0），1（當(dāng)bSize=1），2（當(dāng)bSize=2），和4（當(dāng)bSize=3）﹔注意不可以為3個(gè)字節(jié)。大部分的卷標(biāo)僅需一個(gè)字節(jié)的數(shù)據(jù)﹔全局項(xiàng)目的卷標(biāo)Unit比較特殊有可能最多用到4個(gè)字節(jié)來表示其資料。）0x01:GenericDesktop（查文檔UniversalSerialBusHIDUsageTables，第三節(jié)UsagePages）0x09,0x06,//USAGE(Keyboard)//分析0x09
7、=00001001根據(jù)HID短項(xiàng)目格式0000：Usage10：bType，區(qū)域項(xiàng)目01：bSize，1字節(jié)0x06：KeyBoard（查文檔UniversalSerialBusHIDUsageTables，第四節(jié)）0xa1,0x01,//COLLECTION(Application)//分析0xa1：0x01：（卷標(biāo)EndCollection沒有跟隨任何資料。但是卷標(biāo)Collection跟隨一個(gè)字節(jié)的數(shù)據(jù)，例如指針的數(shù)據(jù)名為Physical，而鼠標(biāo)的為Application。所有Collection的數(shù)據(jù)名稱與代碼如表7：表7：報(bào)告集合的名稱與代碼NamedU
8、sageUsagePhy
