BLE4.0蓝牙center与peripheral建立连接绑定过程_ble center

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

 VOID GAPCentralRole_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 and status.

  gapDeviceInitDoneEvent_t  initDone;           //!< GAP initialization done.

  gapDeviceInfoEvent_t      deviceInfo;         //!< Discovery device information event structure.

  gapDevDiscEvent_t         discCmpl;           //!< Discovery complete event structure.

  gapEstLinkReqEvent_t      linkCmpl;           //!< Link complete event structure.

  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: @ref GAP_ADVERTISEMENT_TYPE_DEFINES

  uint8 addrType;           //!< address type: @ref GAP_ADDR_TYPE_DEFINES

  uint8 addr[B_ADDR_LEN];   //!< Address of the advertisement or SCAN_RSP

  int8 rssi;                //!< Advertisement or SCAN_RSP RSSI

  uint8 dataLen;            //!< Length (in bytes) of the data field (evtData)

  uint8 *pEvtData;          //!< Data field of advertisement or 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 type used by the advertiser: GAP_ADVERTISEMENT_TYPE_DEFINES

  uint8 addrType;         //!< Address Type: @ref GAP_ADDR_TYPE_DEFINES

  uint8 addr[B_ADDR_LEN]; //!< Device's Address

} 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 Private Address.

#define         ADDRTYPE_PRIVATE_RESOLVE   0x03

         Generate Resolvable Private Address.

 

case GAP_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,"info\n",sizeof("info\n"));//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's Task ID

  uint8 highDutyCycle;        //!< TRUE to high duty cycle scan, FALSE if not.

  uint8 whiteList;            //!< Determines use of the white list: @ref GAP_WHITELIST_DEFINES

  uint8 addrTypePeer;         //!< Address type of the advertiser: @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

#define GAP_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: @ref GAP_ADDR_TYPE_DEFINES

  uint8 devAddr[B_ADDR_LEN]; //!< Device address of link

  uint16 connectionHandle;   //!< Connection Handle from controller used 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_t GATT_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 void simpleBLEGATTDiscoveryEvent( 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_t GATT_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: @ref GAP_ADDR_TYPE_DEFINES

  uint8 devAddr[B_ADDR_LEN]; //!< Device address of link

  uint16 connectionHandle;   //!< Connection Handle from controller used to ref the device

  uint16 connInterval;       //!< Connection Interval

  uint16 connLatency;        //!< Conenction Latency

  uint16 connTimeout;        //!< Connection Timeout

  uint8 clockAccuracy;       //!< Clock Accuracy

} gapEstLinkReqEvent_t;