OSAL处理来自AF的数据包流程.docx

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 messages link quality * @param SecurityUse - Security enable/disable * * @return none *///传输数据：APS----AFvoid 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 ))