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分类： LINUX
2013-04-20 11:16:26
OSAL处理来自AF的数据包流程
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(如SampleApp_ProcessEvent()) ——判断具体事件类型调用相应回调函数(如SampleApp_MessageMSGCB()) ——实现具体现象
afIncomingData()函数用来从APS层传递一个ASDU到AF层;中间调用了afBuildMSGIncoming()函数，这个函数是用来为APS层建立一个特定格式的消息包,然后再调用osal_msg_send()把消息(包含了ASDU)传往AF层.
AF层规定接收的数据包的类型如下:
typedef struct
{
osal_event_hdr_t hdr;
uint16 groupId;
uint16 clusterId;
afAddrType_t srcAddr;
byte endPoint;
byte wasBroadcast;
byte LinkQuality;
byte SecurityUse;
uint32 timestamp;
afMSGCommandFormat_t cmd;
} afIncomingMSGPacket_t;
首先看一下afIncomingData（）函数
/*********************************************************************
* @fn afIncomingData
*
* @brief Transfer a data PDU (ASDU) from the APS sub-layer to the AF.
*
* @param aff - pointer to APS frame format
* @param SrcAddress - Source address
* @param LinkQuality - incoming message's link quality
* @param SecurityUse - Security enable/disable
*
* @return none
*/
//传输数据：APS---->AF
void afIncomingData( aps_FrameFormat_t *aff, zAddrType_t *SrcAddress, uint8 LinkQuality, byte SecurityUse, uint32 timestamp )
{
endPointDesc_t *epDesc = NULL;
uint16 epProfileID = 0xFFFF; // Invalid Profile ID
epList_t *pList;
uint8 grpEp;
/*如果这个帧传递模式是组传递*/
if ( ((aff->FrmCtrl & APS_DELIVERYMODE_MASK) == APS_FC_DM_GROUP) )
{
// Find the first endpoint for this group
grpEp = aps_FindGroupForEndpoint( aff->GroupID, APS_GROUPS_FIND_FIRST );
if ( grpEp == APS_GROUPS_EP_NOT_FOUND )
return; // No endpoint found，没找到终端
epDesc = afFindEndPointDesc( grpEp ); //找到终端，接着找终端描述符
if ( epDesc == NULL )
return; // Endpoint descriptor not found，没找到终端描述符
pList = afFindEndPointDescList( epDesc->endPoint ); //找到终端描述符
} //pList指向终端列表中的元素
//-----------
/*广播到各端点*/
else if ( aff->DstEndPoint == AF_BROADCAST_ENDPOINT )
{
// Set the list
if ( (pList = epList) )
{
epDesc = pList->epDesc;
}
}
//-----------
/*单播到特定端点*/
else if ( (epDesc = afFindEndPointDesc( aff->DstEndPoint )) )
{
pList = afFindEndPointDescList( epDesc->endPoint );
}
//-----------
while ( epDesc )
{
if ( pList->pfnDescCB ) //如果有回叫函数
{
uint16 *pID = (uint16 *)(pList->pfnDescCB(AF_DESCRIPTOR_PROFILE_ID, epDesc->endPoint ));
if ( pID )
{
epProfileID = *pID;
osal_mem_free( pID );
}
}
else if ( epDesc->simpleDesc ) //简单描述符
{
epProfileID = epDesc->simpleDesc->AppProfId;
}
if ( (aff->ProfileID == epProfileID) ||((epDesc->endPoint == ZDO_EP) && (aff->ProfileID == ZDO_PROFILE_ID)) ) //符合各条件
{
{
//建立信息传递,注意,这里调用afBuildMSGIncoming()！！
afBuildMSGIncoming( aff, epDesc, SrcAddress, LinkQuality, SecurityUse, timestamp );
}
}
/*组传递模式，找下一个终端*/
if ( ((aff->FrmCtrl & APS_DELIVERYMODE_MASK) == APS_FC_DM_GROUP) )
{
// Find the next endpoint for this group
grpEp = aps_FindGroupForEndpoint( aff->GroupID, grpEp );
if ( grpEp == APS_GROUPS_EP_NOT_FOUND )
return; // No endpoint found
epDesc = afFindEndPointDesc( grpEp );
if ( epDesc == NULL )
return; // Endpoint descriptor not found
pList = afFindEndPointDescList( epDesc->endPoint ); //epDesc != NULL
}
/*广播传递模式,找下一个终端*/
else if ( aff->DstEndPoint == AF_BROADCAST_ENDPOINT )
{
pList = pList->nextDesc;
if ( pList )
epDesc = pList->epDesc;
else
epDesc = NULL;
}
/*单播模式,无下一终端*/
else
epDesc = NULL;
}
}
//----------------------------------------------------------------------------------------
afBuildMSGIncoming( aps_FrameFormat_t *aff, endPointDesc_t *epDesc, zAddrType_t *SrcAddress, uint8 LinkQuality, byte SecurityUse,uint32 timestamp )
实参——形参
Aff——*aff
epDesc——*epDesc
SrcAddress——*SrcAddress
LinkQuality—— LinkQuality
SecurityUse—— SecurityUse
Timestamp—— timestamp
看一下afBuildMSGIncoming（）函数
/*********************************************************************
* @fn afBuildMSGIncoming
*
* @brief Build the message for the app
*
* @param
*
* @return pointer to next in data buffer
*/*********************************************************************
//Build the message for the app
static void afBuildMSGIncoming(
aps_FrameFormat_t *aff,
endPointDesc_t *epDesc,
zAddrType_t *SrcAddress,
uint8 LinkQuality,
byte SecurityUse,
uint32 timestamp
)
{
afIncomingMSGPacket_t *MSGpkt; //AF层需要接收这种结构体类型的信息包
//下面就通过本函数来为接收到的信息构造这种类型
//信息包，从而可以发送到AF层去
const byte len = sizeof( afIncomingMSGPacket_t ) + aff->asduLength; //长度
byte *asdu = aff->asdu;
MSGpkt = (afIncomingMSGPacket_t *)osal_msg_allocate( len ); //分配内存
if ( MSGpkt == NULL )
{
return;
}
MSGpkt->hdr.event = AF_INCOMING_MSG_CMD; //事件类型
MSGpkt->groupId = aff->GroupID; //组ID
MSGpkt->clusterId = aff->ClusterID; //簇ID
afCopyAddress( &MSGpkt->srcAddr, SrcAddress ); //源地址
MSGpkt->srcAddr.endPoint = aff->SrcEndPoint;
MSGpkt->endPoint = epDesc->endPoint;
MSGpkt->wasBroadcast = aff->wasBroadcast; //广播
MSGpkt->LinkQuality = LinkQuality; //链路质量
MSGpkt->SecurityUse = SecurityUse; //安全使能
MSGpkt->timestamp = timestamp; //时间
MSGpkt->cmd.TransSeqNumber = 0; //传送序号
MSGpkt->cmd.DataLength = aff->asduLength; //长度
if ( MSGpkt->cmd.DataLength ) //aff->asduLength
{
MSGpkt->cmd.Data = (byte *)(MSGpkt + 1); //空间
//把长为 MSGpkt->cmd.DataLength数据从asdu赋给MSGpkt->cmd.Data
osal_memcpy( MSGpkt->cmd.Data, asdu, MSGpkt->cmd.DataLength );
}
else //无数据
{
MSGpkt->cmd.Data = NULL;
}
#if defined ( MT_AF_CB_FUNC )
// If MT has subscribed for this callback, don't send as a message.
if AFCB_CHECK(MSGpkt->endPoint, *(epDesc->task_id), SPI_CB_AF_DATA_IND)
{
af_MTCB_IncomingData( (void *)MSGpkt );
// Release the memory.
osal_msg_deallocate( (void *)MSGpkt );
}
else
#endif
{
// Send message through task message.
//数据包构造好后，就要发送到AF层，这里调用osal_msg_send()
osal_msg_send( *(epDesc->task_id), (uint8 *)MSGpkt );
}
}
/*********************************************************************
看下osal_msg_send()函数
osal_msg_send( *(epDesc->task_id), (uint8 *)MSGpkt );
byte osal_msg_send( byte destination_task, byte *msg_ptr )
实参——形参
*(epDesc->task_id)—— destination_task
(uint8 *)MSGpkt——*msg_ptr
/*********************************************************************
* @fn osal_msg_send
*
* @brief
*
* This function is called by a task to send a command message to
* another task or processing element. The sending_task field must
* refer to a valid task, since the task ID will be used
* for the response message. This function will also set a message
* ready event in the destination tasks event list.
*
* @param byte destination task - Send msg to? Task ID 目的任务
* @param byte *msg_ptr - pointer to new message buffer 指向消息
* @param byte len - length of data in message 消息中的数据长度
*
* @return ZSUCCESS, INVALID_SENDING_TASK, INVALID_DESTINATION_TASK,
* INVALID_MSG_POINTER, INVALID_LEN
*/*********************************************************************
byte osal_msg_send( byte destination_task, byte *msg_ptr )
{
//--------------------------------
if ( msg_ptr == NULL ) //无消息
return ( INVALID_MSG_POINTER );
//--------------------------------
if ( destination_task >= tasksCnt ) //不在任务条目范围内？？？任务不合法
{
osal_msg_deallocate( msg_ptr );
return ( INVALID_TASK );
}
//--------------------------------
// Check the message header
if ( OSAL_MSG_NEXT( msg_ptr ) != NULL ||OSAL_MSG_ID( msg_ptr ) != TASK_NO_TASK ) //检查到指针不合法
{
osal_msg_deallocate( msg_ptr ); //释放这个消息内存
return ( INVALID_MSG_POINTER );
}
OSAL_MSG_ID( msg_ptr ) = destination_task; //检查到含有合法任务的消息，
//则把目的任务的ID赋给消息结构体的dest_id
//OSAL_MSG_ID（）参见前面
//--------------------------------
// queue message 把当前消息（msg_ptr所指）加入到系统消息列表中
osal_msg_enqueue( &osal_qHead, msg_ptr );
//--------------------------------
// Signal the task that a message is waiting
osal_set_event( destination_task, SYS_EVENT_MSG ); //设置事件发生标志函数,这个函数很重要。
return ( ZSUCCESS );
}
/*********************************************************************
看下osal_set_event()函数
osal_set_event( destination_task, SYS_EVENT_MSG )
osal_set_event( byte task_id, UINT16 event_flag )
实参——形参
destination_task—— task_id
SYS_EVENT_MSG—— event_flag
/*********************************************************************
* @fn osal_set_event
*
* @brief
*
* This function is called to set the event flags for a task. The
* event passed in is OR'd into the task's event variable.
*
* @param byte task_id - receiving tasks ID
* @param byte event_flag - what event to set
*
* @return ZSUCCESS, INVALID_TASK
*/*********************************************************************/
byte osal_set_event( byte task_id, UINT16 event_flag )
{
if ( task_id < tasksCnt )
{
halIntState_t intState;
HAL_ENTER_CRITICAL_SECTION(intState); // Hold off interrupts
tasksEvents[task_id] |= event_flag; // Stuff the event bit(s) 相应任务有事件发生
HAL_EXIT_CRITICAL_SECTION(intState); // Release interrupts
}
else
return ( INVALID_TASK );
return ( ZSUCCESS );
}
/*********************************************************************/
从上面的tasksEvents[task_id] |= event_flag;系统主循环函数中会轮询到相应任务有事件发生（这点请参照OSAL系统主循环流程）,因而调用相应的任务事件处理函数.
比如说这个消息是从另一个节点发过来的flash消息（簇ID为SAMPLEAPP_FLASH_CLUSTERID），那么是用户应用任务的消息事件，则task_id=6,Event_flag在设置事件发生标志函数中被定义为SYS_EVENT_MSG，因而当系统主循环函数轮询到用户应用任务有事件发生时，就调用其事件处理函数SampleApp_ProcessEvent()，来看下这个函数：
函数中对应的task_id=6，events=SYS_EVENT_MSG，而在构造AF信息包的时候,MSGpkt->hdr.event = AF_INCOMING_MSG_CMD; 因而函数最终调用SampleApp_MessageMSGCB( MSGpkt )进行处理.
/*********************************************************************
uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )
{
afIncomingMSGPacket_t *MSGpkt; //接收到的消息
/*如果是系统消息*///判断OSAL层的消息类型
if ( events & SYS_EVENT_MSG )
{
MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
//接收属于本用户应用SampleApp的消息（SampleApp_TaskID来标志）
while ( MSGpkt ) //接收到着
{ //属于这个应用的消息osal_msg_receive( MApp_TaskID );
switch ( MSGpkt->hdr.event ) //判断数据包事件类型
{
// Received when a key is pressed
/*事件：按键事件*/
case KEY_CHANGE: //#define KEY_CHANGE 0xC0 --Key Events
SampleApp_HandleKeys( ((keyChange_t *)MSGpkt)->state, ((keyChange_t *)MSGpkt)->keys );
break; //执行按键处理函数
// Received when a messages is received (OTA:over the air) for this endpoint
/*事件：收到信息事件*/
case AF_INCOMING_MSG_CMD:
// #define AF_INCOMING_MSG_CMD 0x 1A --Incoming MSG type message
SampleApp_MessageMSGCB( MSGpkt );
break;
// Received whenever the device changes state in the network
/*事件：端点状态变化事件*/
case ZDO_STATE_CHANGE:
//#define ZDO_STATE_CHANGE 0xD1 --ZDO has changed the device's network state
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
//释放消息占用的内存
osal_msg_deallocate( (uint8 *)MSGpkt );
// Next - if one is available
MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
} //end： while ( MSGpkt )
// return unprocessed events
// 判断是否有未处理的系统消息，有则接收返回没有处理的事件
return (events ^ SYS_EVENT_MSG);
//注意！这里 return到osal_start_system()下
}
//--------------------------
// Send a message out - This event is generated by a timer
// (setup in SampleApp_Init()).
if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT ) //发送周期消息
{
// 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;
}
/*********************************************************************
最后我们再来看下SampleApp_MessageMSGCB()函数
SampleApp_MessageMSGCB( MSGpkt )
SampleApp_MessageMSGCB( afIncomingMSGPacket_t *pkt )
实参——形参
MSGpkt——*pkt
通过判断信息包中的簇ID,为SAMPLEAPP_FLASH_CLUSTERID,因而最终执行小灯闪烁四下.
/*********************************************************************
* @fn SampleApp_MessageMSGCB
*
* @brief Data message processor callback. This function processes
* any incoming data - probably from other devices. So, based
* on cluster ID, perform the intended action.
*
* @param none
*
* @return none
*/
//SampleApp_MessageMSGCB（）功能是处理接收数据，
函数的输入为接收到的数据，而输出为小灯闪烁的时间。
void SampleApp_MessageMSGCB( afIncomingMSGPacket_t *pkt )
{
uint16 flashTime;
switch ( pkt->clusterId )//判断簇ID
{
case SAMPLEAPP_PERIODIC_CLUSTERID: //periodic
break;
case SAMPLEAPP_FLASH_CLUSTERID: //flash
flashTime = BUILD_UINT16(pkt->cmd.Data[1], pkt->cmd.Data[2] );
HalLedBlink( HAL_LED_4, 4, 50, (flashTime / 4) );
//小灯闪烁四次
break;
}
}
/*********************************************************************/
