zigbee学习:示例程序SampleApp中通讯流程

zigbee学习:示例程序SampleApp中通讯流程

本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.

参考链接:

http://wjf88223.blog.163.com/blog/static/3516800120104711268760/

http://www.cnblogs.com/yqh2007/archive/2011/04/27/2030062.html

环境：

主机:WIN7

开发环境:IAR8.10.3

MCU:CC2530

示例程序:SampleApp

说明:

在此示例程序中,有两种通讯方式:

1.每个设备每隔5s,会发送广播信息

2.按下向上键,设备会向组1发送信息

如果按下向右键,可以加入或退出组1

代码分析:

1.在main()->osal_init_system()->osalInitTasks()中增加示例程序任务SampleApp_Init( taskID )

此函数代码:

void SampleApp_Init( uint8 task_id )
{
  SampleApp_TaskID = task_id;
  SampleApp_NwkState = DEV_INIT;
  SampleApp_TransID = 0;
 
  // Device hardware initialization can be added here or in main() (Zmain.c).
  // If the hardware is application specific - add it here.
  // If the hardware is other parts of the device add it in main().
 
 #if defined ( BUILD_ALL_DEVICES )
  // The "Demo" target is setup to have BUILD_ALL_DEVICES and HOLD_AUTO_START
  // We are looking at a jumper (defined in SampleAppHw.c) to be jumpered
  // together - if they are - we will start up a coordinator. Otherwise,
  // the device will start as a router.
  if ( readCoordinatorJumper() )
    zgDeviceLogicalType = ZG_DEVICETYPE_COORDINATOR;
  else
    zgDeviceLogicalType = ZG_DEVICETYPE_ROUTER;
#endif // BUILD_ALL_DEVICES
 
#if defined ( HOLD_AUTO_START )
  // HOLD_AUTO_START is a compile option that will surpress ZDApp
  //  from starting the device and wait for the application to
  //  start the device.
  ZDOInitDevice(0);
#endif
 
  // Setup for the periodic message's destination address
  // Broadcast to everyone
  SampleApp_Periodic_DstAddr.addrMode = (afAddrMode_t)AddrBroadcast;
  SampleApp_Periodic_DstAddr.endPoint = SAMPLEAPP_ENDPOINT;
  SampleApp_Periodic_DstAddr.addr.shortAddr = 0xFFFF;
 
  // Setup for the flash command's destination address - Group 1
  SampleApp_Flash_DstAddr.addrMode = (afAddrMode_t)afAddrGroup;
  SampleApp_Flash_DstAddr.endPoint = SAMPLEAPP_ENDPOINT;
  SampleApp_Flash_DstAddr.addr.shortAddr = SAMPLEAPP_FLASH_GROUP;
 
  // Fill out the endpoint description.
  SampleApp_epDesc.endPoint = SAMPLEAPP_ENDPOINT;
  SampleApp_epDesc.task_id = &SampleApp_TaskID;
  SampleApp_epDesc.simpleDesc
            = (SimpleDescriptionFormat_t *)&SampleApp_SimpleDesc;
  SampleApp_epDesc.latencyReq = noLatencyReqs;
 
  // Register the endpoint description with the AF
  afRegister( &SampleApp_epDesc );
 
  // Register for all key events - This app will handle all key events
  RegisterForKeys( SampleApp_TaskID );
 
  // By default, all devices start out in Group 1
  SampleApp_Group.ID = 0x0001;
  osal_memcpy( SampleApp_Group.name, "Group 1", 7  );
  aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );
 
#if defined ( LCD_SUPPORTED )
  HalLcdWriteString( "SampleApp", HAL_LCD_LINE_1 );
#endif
}

2.任务数组tasksArr[]中增加示例程序任务:

// The order in this table must be identical to the task initialization calls below in osalInitTask.
const pTaskEventHandlerFn tasksArr[] = {
  macEventLoop,
  nwk_event_loop,
  Hal_ProcessEvent,
#if defined( MT_TASK )
  MT_ProcessEvent,
#endif
  APS_event_loop,
#if defined ( ZIGBEE_FRAGMENTATION )
  APSF_ProcessEvent,
#endif
  ZDApp_event_loop,
#if defined ( ZIGBEE_FREQ_AGILITY ) || defined ( ZIGBEE_PANID_CONFLICT )
  ZDNwkMgr_event_loop,
#endif
  SampleApp_ProcessEvent
};

3.任务处理函数SampleApp_ProcessEvent()解析

源代码:

uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )
{
  afIncomingMSGPacket_t *MSGpkt;
  (void)task_id;  // Intentionally unreferenced parameter
 
  if ( events & SYS_EVENT_MSG )
  {
    MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
    while ( MSGpkt )
    {
      switch ( MSGpkt->hdr.event )
      {
        // Received when a key is pressed
        case KEY_CHANGE:
          SampleApp_HandleKeys( ((keyChange_t *)MSGpkt)->state, ((keyChange_t *)MSGpkt)->keys );
          break;
 
        // Received when a messages is received (OTA) for this endpoint
        case AF_INCOMING_MSG_CMD:
          SampleApp_MessageMSGCB( MSGpkt );
          break;
 
        // Received whenever the device changes state in the network
        case ZDO_STATE_CHANGE:
          SampleApp_NwkState = (devStates_t)(MSGpkt->hdr.status);
          if ( (SampleApp_NwkState == DEV_ZB_COORD)
              || (SampleApp_NwkState == DEV_ROUTER)
              || (SampleApp_NwkState == DEV_END_DEVICE) )
          {
            // Start sending the periodic message in a regular interval.
            osal_start_timerEx( SampleApp_TaskID,
                              SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
                              SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT );
          }
          else
          {
            // Device is no longer in the network
          }
          break;
 
        default:
          break;
      }
 
      // Release the memory
      osal_msg_deallocate( (uint8 *)MSGpkt );
 
      // Next - if one is available
      MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
    }
 
    // return unprocessed events
    return (events ^ SYS_EVENT_MSG);
  }
 
  // Send a message out - This event is generated by a timer
  //  (setup in SampleApp_Init()).
  if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT )
  {
    // Send the periodic message
    SampleApp_SendPeriodicMessage();
 
    // Setup to send message again in normal period (+ a little jitter)
    osal_start_timerEx( SampleApp_TaskID, SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
        (SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT + (osal_rand() & 0x00FF)) );
 
    // return unprocessed events
    return (events ^ SAMPLEAPP_SEND_PERIODIC_MSG_EVT);
  }
 
  // Discard unknown events
  return 0;
}

解析:
问:KEY_CHANGE事件如何在SampleApp_ProcessEvent()函数产生?

答:SampleApp_Init()函数注册了事件RegisterForKeys( SampleApp_TaskID );

问:AF_INCOMING_MSG_CMD事件如何在SampleApp_ProcessEvent()函数产生?

答:SampleApp_Init()函数注册了事件afRegister( &SampleApp_epDesc );

以下为系统处理来自AF层数据包的大致流程:

afIncomingData() ->afBuildMSGIncoming()->osal_msg_send() -> osal_set_event()
根据task_id调用事件处理函数SampleApp_ProcessEvent(),在此函数中判断具体事件类型再调用相应回调函数如SampleApp_MessageMSGCB()

问:ZDO_STATE_CHANGE事件如何在SampleApp_ProcessEvent()函数产生?

答:网络状态改变会引发函数ZDO_UpdateNwkStatus()的处理,此函数中产生应用任务数据

osal_msg_send( *(epDesc->epDesc->task_id), (byte *)msgPtr ); //发往应用任务

4.信息发送过程

步骤:

1).设备连接网络,网络状态改变,产生事件ZDO_STATE_CHANGE

在任务处理函数SampleApp_ProcessEvent()中产生一个定时器命令:

osal_start_timerEx( SampleApp_TaskID,
                              SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
                              SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT );

2).事件到后,发送信息,并且再度启动定时器

if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT )
  {
    // Send the periodic message
    SampleApp_SendPeriodicMessage();
 
    // Setup to send message again in normal period (+ a little jitter)
    osal_start_timerEx( SampleApp_TaskID, SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
        (SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT + (osal_rand() & 0x00FF)) );
 
    // return unprocessed events
    return (events ^ SAMPLEAPP_SEND_PERIODIC_MSG_EVT);
  }

3).SampleApp_SendPeriodicMessage()函数源代码:

void SampleApp_SendPeriodicMessage( void )
{
  if ( AF_DataRequest( &SampleApp_Periodic_DstAddr, &SampleApp_epDesc,
                       SAMPLEAPP_PERIODIC_CLUSTERID,
                       1,
                       (uint8*)&SampleAppPeriodicCounter,
                       &SampleApp_TransID,
                       AF_DISCV_ROUTE,
                       AF_DEFAULT_RADIUS ) == afStatus_SUCCESS )
  {
  }
  else
  {
    // Error occurred in request to send.
  }
}

此函数调用 AF_DataRequest()函数向组1发送命令

5.退出和加入组1是通过RIGHT按键实现,按键处理源代码:

void SampleApp_HandleKeys( uint8 shift, uint8 keys )
{
  (void)shift;  // Intentionally unreferenced parameter
 
  if ( keys & HAL_KEY_SW_1 )
  {
    /* This key sends the Flash Command is sent to Group 1.
     * This device will not receive the Flash Command from this
     * device (even if it belongs to group 1).
     */
    SampleApp_SendFlashMessage( SAMPLEAPP_FLASH_DURATION );
  }
 
  if ( keys & HAL_KEY_SW_2 )
  {
    /* The Flashr Command is sent to Group 1.
     * This key toggles this device in and out of group 1.
     * If this device doesn't belong to group 1, this application
     * will not receive the Flash command sent to group 1.
     */
    aps_Group_t *grp;
    grp = aps_FindGroup( SAMPLEAPP_ENDPOINT, SAMPLEAPP_FLASH_GROUP );
    if ( grp )
    {
      // Remove from the group
      aps_RemoveGroup( SAMPLEAPP_ENDPOINT, SAMPLEAPP_FLASH_GROUP );
    }
    else
    {
      // Add to the flash group
      aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );
    }
  }
}