Research on Software Structure Design of Very High Frequency Data Link Mode 2 Protocol Stack
Jun Zhang · Avionics Technology · 2006
In order to improve the work efficiency of protocol,with reference to the implementing method of HDLC protocol,the software model and the design concept of VDL M2 protocol stack were proposed.First,the layer structure of the VDL M2 protocol was introduced,and the function of each layer was briefly discussed.Next,the software design and implementation method of protocol stack were explained,namely on the precondition that the current address family in-core was not changed,a new socket address family AF_VDLM2 based on VDLM2 protocol set forward. According to the function operation,module-based structure was adopted.Then,the software design flow of receiving and dispatching module and the structure design of the buffer descriptor were emphasized.Finally,the communication mode among the layers was introduced,namely the data structure,establishment and operation of the shared memory field.The protocol stack may be load into aircraft CMU,and so facility cost would be significantly saved.