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HCIÌṩһÌ×ͳһµÄ·½·¨À´·ÃÎÊBluetoothµ×²ã¡£ÈçͼËùʾ£º
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ÔÚHostÕâÒ»¶Ë£ºapplication,SDP,L2capµÈЭÒé¶¼ÊÇÈí¼þÐÎʽÌá³öµÄ£¨BluezÖÐÊÇÒÔkernel²ã³ÌÐò)¡£ÔÚModuleÕâÒ»¶Ë£ºLink Manager, BB, µÈЭÒé¶¼ÊÇÓ²¼þÖÐfirmwareÌṩµÄ¡£
¶øHCIÔò±È½ÏÌØÊ⣬ËüÒ»²¿·ÖÔÚÈí¼þÖÐʵÏÖ£¬ÓÃÀ´¸øÉϲãЭÒéºÍ³ÌÐòÌṩ·ÃÎʽӿڣ¨BluezÖÐ,hci.c hci_usb.c£¬hci_sock.cµÈ£©.ÁíÒ»²¿·ÖÒ²ÊÇÔÚFirmwareÖÐʵÏÖ£¬ÓÃÀ´½«Èí¼þ²¿·ÖµÄÖ¸ÁîµÈÓõײãЭÒéÃ÷°×µÄ·½Ê½´«µÝ¸øµ×²ã¡£
¾ÓÓÚPCµÄÉϲã³ÌÐòÓëЭÒéºÍ¾ÓÓÚModulesµÄϲãЭÒéÖ®¼äͨ¹ýHCI¹µÍ¨£¬ÓÐ4ÖÖ²»Í¬ÐÎʽµÄ´«Ê䣺Commands, Event, ACL Data, SCO/eSCO Data¡£
1.1. HCI Command£º
HCI CommandÊÇHostÏòModules·¢ËÍÃüÁîµÄÒ»ÖÖ·½Ê½¡£HCI Command Packet½á¹¹ÈçÏ£º
OpCodeÓÃÀ´Î¨Ò»±êʶHCI Command.ËüÓÉ2²¿·Ö×é³É£¬10bitµÄOpcode Command. 6bitµÄOpcode Group¡£
1.1.1: OpCode Group:
Linux Kernel£¨BlueZ£©ÖУ¬~/include/net/bluetooth/hci.hÖж¨ÒåÁËOpCode Group¡£
#define OGF_LINK_CTL 0x01
#define OGF_LINK_POLICY 0x02  
#define OGF_HOST_CTL 0x03
#define OGF_INFO_PARAM 0x04
#define OGF_STATUS_PARAM 0x05
ËüÃÇ´ú±íÁ˲»Í¬µÄCommand Group£º
OGF_LINK_CTL: Link control,Õâ¸öCommand GroupÖеÄCommandÔÊÐíHost¿ØÖÆÓëÆäËübluetooth device µÄÁ¬½Ó¡£
OGF_LINK_POLICY £ºLink Policy¡£Õâ¸öCommand GroupÖеÄCommandÔÊÐíµ÷ÕûLink Manager control.
OGF_HOST_CTL: Control and Baseband.
1.1.2: Opcode Command: 
ÓÃÀ´ÔÚͬһ¸öGroupÄÚΨһʶ±ðCommand¡£~/include/net/bluetooth/hci.hÖж¨Òå¡£
1.2: HCI Event£º
ModulesÏòHost·¢ËÍһЩÐÅÏ¢£¬Ê¹ÓÃHCI Event¡£Event Packet½á¹¹ÈçÏ£º
HCI Event·Ö3ÖÖ£ºCommand complete Event, Command States Event£¬Command Subsequently Completend.
Command complete Event: Èç¹ûHost·¢Ë͵ÄCommand¿ÉÒÔÁ¢¿ÌÓнá¹û£¬Ôò»á·¢ËÍ´ËÀàEvent¡£Ò²¾ÍÊÇ˵£¬Èç¹û·¢Ë͵ÄCommandÖ»Óë±¾µØModulesÓйأ¬²»ÓëremoteÉ豸´ò½»µÀ£¬ÔòʹÓÃCommand complete Event¡£ÀýÈ磺HCI_Read_Buffer_Size.
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