蓝牙主机从机建立连接绑定过程
蓝牙主机从机建立连接绑定过程
center与simplePeripheral建立连接过程
center首先进行osal_init_system()初始化各个任务，SimpleBLECentral_Init->osal_set_event( simpleBLETaskId,START_DEVICE_EVT );进入SimpleBLECentral_ProcessEvent()
调用
VOIDGAPCentralRole_StartDevice( (gapCentralRoleCB_t *) &simpleBLERoleCB );//当初始化完成，会发送 GAP_DEVICE_INIT_DONE_EVENT由于注册了simpleBLERoleCB函数，因此发送的event由simpleBLERoleCB函数接收static void simpleBLECentralEventCB( gapCentralRoleEvent_t *pEvent )此时pEvent->gap.opcode=GAP_DEVICE_INIT_DONE_EVENT,相应信息存储于pEvent中
typedef union
{
gapEventHdr_t gap; //!< GAP_MSG_EVENT andstatus.
gapDeviceInitDoneEvent_t initDone; //!< GAP initialization done.
gapDeviceInfoEvent_t deviceInfo; //!< Discovery device informationevent structure.
gapDevDiscEvent_t discCmpl; //!< Discovery complete eventstructure.
gapEstLinkReqEvent_t linkCmpl; //!< Link complete eventstructure.
gapLinkUpdateEvent_t linkUpdate; //!< Link update event structure.
gapTerminateLinkEvent_t linkTerminate; //!< Link terminated event structure.
}gapCentralRoleEvent_t;
联合体，只有deviceInfo里面的数据是正确的
typedef struct
{
osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
uint8 opcode; //!< GAP_DEVICE_INIT_DONE_EVENT
uint8 devAddr[B_ADDR_LEN]; //!< Device's BD_ADDR
uint16 dataPktLen; //!<HC_LE_Data_Packet_Length
uint8 numDataPkts; //!<HC_Total_Num_LE_Data_Packets
} gapDeviceInitDoneEvent_t;
能获得如设备地址等信息
设备初始化完成
通过串口发送'1'触发设备发现
进行设备扫描
GAP_DEVICE_INFO_EVENT 0x0D//!< Sent during the Device Discovery Process when a device is discovered.
GAP_DEVICE_DISCOVERY_EVENT 0x01//!< Sent when the Device Discovery Process is complete.
当发现一个设备时，触发一个设备info事件同样是在simpleBLECentralEventCB处理此时pEvent改变为deviceInfo可以获得广告设备的类型，地址。rssi强度，还有广告数据，内容如下。
typedef struct
{
osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
uint8 opcode; //!< GAP_DEVICE_INFO_EVENT
uint8 eventType; //!< Advertisement Type: @refGAP_ADVERTISEMENT_TYPE_DEFINES
uint8 addrType; //!< address type: @refGAP_ADDR_TYPE_DEFINES
uint8 addr[B_ADDR_LEN]; //!< Address of the advertisement orSCAN_RSP
int8 rssi; //!< Advertisement orSCAN_RSP RSSI
uint8 dataLen; //!< Length (in bytes) of thedata field (evtData)
uint8 *pEvtData; //!< Data field of advertisementor SCAN_RSP
} gapDeviceInfoEvent_t;
center代码是通过设备服务器的uuid来查找设备，一旦找到相应的设备，将设备加入
设备表simpleBLEDevList[]中simpleBLEScanRes扫描到的个数自加一。
typedef struct
{
uint8 eventType; //!< Indicates advertising event typeused by the advertiser: GAP_ADVERTISEMENT_TYPE_DEFINES
uint8 addrType; //!< Address Type: @refGAP_ADDR_TYPE_DEFINES
uint8 addr[B_ADDR_LEN]; //!< Device'sAddress
} gapDevRec_t;
设备表的结构体
addrType有：
#define ADDRTYPE_PUBLIC 0x00
Use the BD_ADDR.
#define ADDRTYPE_STATIC 0x01
Static address.
#define ADDRTYPE_PRIVATE_NONRESOLVE 0x02
Generate Non-Resolvable PrivateAddress.
#define ADDRTYPE_PRIVATE_RESOLVE 0x03
Generate Resolvable Private Address.
caseGAP_DEVICE_INFO_EVENT:
{
if ( DEFAULT_DEV_DISC_BY_SVC_UUID ==TRUE )
{
if ( simpleBLEFindSvcUuid(SIMPLEPROFILE_SERV_UUID, //通过uuid找到的设备
pEvent->deviceInfo.pEvtData,
pEvent->deviceInfo.dataLen ) )
{
// HalUARTWrite(0,"infon",sizeof("infon"));//dataLen 数据长度 pEvtData 数据
simpleBLEAddDeviceInfo(pEvent->deviceInfo.addr, pEvent->deviceInfo.addrType );
}
}
}
break;
此时已经获得了扫描到的设备个数，以及设备地址，还有广告内容等信息。
通过串口发送‘3’来 建立连接
建立连接：
typedef struct
{
uint8 taskID; //!< Requesting App/Profile'sTask ID
uint8 highDutyCycle; //!< TRUE to high duty cycle scan,FALSE if not.
uint8 whiteList; //!< Determines use of the whitelist: @ref GAP_WHITELIST_DEFINES
uint8 addrTypePeer; //!< Address type of theadvertiser: @ref GAP_ADDR_TYPE_DEFINES
uint8 peerAddr[B_ADDR_LEN]; //!<Advertiser's address
} gapEstLinkReq_t;
调用 GAP_EstablishLinkReq(gapEstLinkReq_t params);完成后发送GAP_LINK_ESTABLISHED_EVENT,由simpleBLECentralEventCB(gapCentralRoleEvent_t *pEvent )处理
#defineGAP_LINK_ESTABLISHED_EVENT 0x05//!< Sent when the Establish Link Request is complete.
用此时pEvent变为：
typedef struct
{
osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
uint8 opcode; //!<GAP_LINK_ESTABLISHED_EVENT
uint8 devAddrType; //!< Device address type: @refGAP_ADDR_TYPE_DEFINES
uint8 devAddr[B_ADDR_LEN]; //!< Deviceaddress of link
uint16 connectionHandle; //!< Connection Handle from controllerused to ref the device
uint16 connInterval; //!< Connection Interval
uint16 connLatency; //!< Conenction Latency
uint16 connTimeout; //!< Connection Timeout
uint8 clockAccuracy; //!< Clock Accuracy
}gapEstLinkReqEvent_t;
可以得到设备地址。连接的handle连接完成
连接过程中发送START_DISCOVERY_EVT事件进行服务器发现。就可以对相应的handle，characteristic value进行读写操作，或者用于向主机，从机发送数据。
获得服务器相应特性值的handle有三种方法：
1.通过主服务的uuid（uuid已知）来查找。
bStatus_tGATT_DiscPrimaryServiceByUUID (uint16 connHandle,// 连接的handle uint8 * pValue, // uuid uint8 len, // uuid的长度 uint8 taskId // 接收消息的任务ID )
发送 ATT_FIND_BY_TYPE_VALUE_RSP或者 ATT_ERROR_RSP由相应任务接收处理
static voidsimpleBLEGATTDiscoveryEvent( gattMsgEvent_t *pMsg )通过此函数进行通过UUID来查找相应的Handle进行对特性值的相关操作。
2.查找所有的服务
bStatus_tGATT_DiscAllPrimaryServices (uint16 connHandle,//连接handle
uint8 taskId //接收消息的任务ID
)
osal_start_timerEx(simpleBLETaskId, START_DISCOVERY_EVT, DEFAULT_SVC_DISCOVERY_DELAY );
到此连接完成。
3、GATT_DiscAllCharDescs() 这个接口，这个能自动把所有service 查找完，应该能发现你要的UUID。
最后
终止连接：
调用
GAP_TerminateLinkReq（任务id，handle)发送断开连接event
GAP_LINK_TERMINATED_EVENT 又一次调用 simpleBLECentralEventCB(gapCentralRoleEvent_t *pEvent )
typedef struct
{
osal_event_hdr_t hdr; //!< GAP_MSG_EVENT and status
uint8 opcode; //!<GAP_LINK_ESTABLISHED_EVENT
uint8 devAddrType; //!< Device address type: @refGAP_ADDR_TYPE_DEFINES
uint8 devAddr[B_ADDR_LEN]; //!< Deviceaddress of link
uint16 connectionHandle; //!< Connection Handle from controllerused to ref the device
uint16 connInterval; //!< Connection Interval
uint16 connLatency; //!< Conenction Latency
uint16 connTimeout; //!< Connection Timeout
uint8 clockAccuracy; //!< Clock Accuracy
}gapEstLinkReqEvent_t;