cc2540特征值查找之同时查找两个特征值

最新推荐文章于 2022-07-11 07:36:00 发布

原创最新推荐文章于 2022-07-11 07:36:00 发布 · 3.3k 阅读

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#CC2540 #BLE #两个特征值的查找

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本文详细解析了蓝牙低功耗(BLE)设备通过GATT协议进行服务、特性和属性发现的过程。具体介绍了如何利用attReadByTypeReq_t结构体发起读取请求，并通过响应消息确定已发现的服务范围及特性句柄。

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static void simpleBLEGATTDiscoveryEvent( gattMsgEvent_t *pMsg )
{ 
  
   attReadByTypeReq_t req;  
   if ( simpleBLEDiscState == BLE_DISC_STATE_SVC )   
   {    
      // Service found, store handles    
      if ( pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP &&       
       pMsg->msg.findByTypeValueRsp.numInfo > 0 )   
      {      
        simpleBLESvcStartHdl = pMsg->msg.findByTypeValueRsp.handlesInfo[0].handle;  
        simpleBLESvcEndHdl = pMsg->msg.findByTypeValueRsp.handlesInfo[0].grpEndHandle;    
       }    
  
      // If procedure complete    
      if ( ( pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP  &&           
      pMsg->hdr.status == bleProcedureComplete ) ||         
      ( pMsg->method == ATT_ERROR_RSP ) )   
      {      
        if ( simpleBLESvcStartHdl != 0 )      
        {        
          // Discover characteristic       
          simpleBLEDiscState = BLE_DISC_STATE_CHAR1;      
          req.startHandle = simpleBLESvcStartHdl;    
          req.endHandle = simpleBLESvcEndHdl;    
          req.type.len = ATT_BT_UUID_SIZE;
          req.type.uuid[0] = LO_UINT16(SIMPLEPROFILE_CHAR1_UUID);    
          req.type.uuid[1] = HI_UINT16(SIMPLEPROFILE_CHAR1_UUID);      
          GATT_ReadUsingCharUUID( simpleBLEConnHandle, &req, simpleBLETaskId );     
         }    
      }  
  }  
  
  else if ( simpleBLEDiscState == BLE_DISC_STATE_CHAR1 )  
  {    
    // Characteristic found, store handle    
     if ( pMsg->method == ATT_READ_BY_TYPE_RSP &&      
        pMsg->msg.readByTypeRsp.numPairs > 0 )
        {      
           simpleBLECharHdl[0] = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],                         
           pMsg->msg.readByTypeRsp.dataList[1] );      
    
           LCD_WRITE_STRING( "CHAR 1 Found", HAL_LCD_LINE_1 );      
           simpleBLEProcedureInProgress = TRUE;      
       }
     else // pMsg->msg.readByTypeRsp.numPairs is 0.
     {
       simpleBLEDiscState = BLE_DISC_STATE_CHAR2;    
       req.startHandle = simpleBLESvcStartHdl;  
       req.endHandle = simpleBLESvcEndHdl;   
       req.type.len = ATT_BT_UUID_SIZE;    
       req.type.uuid[0] = LO_UINT16(SIMPLEPROFILE_CHAR2_UUID);   
       req.type.uuid[1] = HI_UINT16(SIMPLEPROFILE_CHAR2_UUID);    
       GATT_ReadUsingCharUUID( simpleBLEConnHandle, &req, simpleBLETaskId );  
     }
  }  
  
  else if (simpleBLEDiscState == BLE_DISC_STATE_CHAR2)  
  {     // Characteristic found, store handle    
    if ( pMsg->method == ATT_READ_BY_TYPE_RSP &&     
    pMsg->msg.readByTypeRsp.numPairs > 0 )    
    {      
      simpleBLECharHdl[1] = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],                                      
      pMsg->msg.readByTypeRsp.dataList[1] );     
      LCD_WRITE_STRING( "CHAR 2 Found", HAL_LCD_LINE_2 );      
      simpleBLEProcedureInProgress = FALSE;  
    }    
    simpleBLEDiscState = BLE_DISC_STATE_IDLE;
  }

}