Design And Implementation Of Vehicle Gateway System Based On ARM And FreeRTOS

In order to satisfy consumer' s demand for intelligence,security and entertainment in cars,automotive electronic systems continues to expand.The number of automotive interior sensors and actuators is increasing,then the electronic control unit(ECU)subsequently becomes more and more.Based on the different performances,costs and occasions,the current network in cars is a heterogeneous network by the coexistence of multibuses.Gateway is the core component which connects different buses that its design and implementation is an important research topic.Through the analysis of the domestic and abroad designing scheme of automobile gateway,I have found the following shortcomings:First,gateway functions are single.Most of them only support the data transmission between two bus protocols.Second,the gateway design is limited in several mature auto buses,which supports little to the Ethernet in cars.Third,the selection of hardware and software in the gateway designing scheme is not reasonable.Considering these shortcomings,this thesis has designed and realized the system software in the gateway,built the gateway test platform,and tested the gateway system on the basis of the existing hardware platform.The main works are as follows:First of all,basing on the existing hardware platform of microcontroller,this thesis has achieved the transplant of FreeRTOS operating system.As the first software layer of gateway,the transplanted operating system is closely related to the processor.Basing on the STM32F103VET6 microcontroller,this thesis has analyzed correlated characteristics of the processor,then achieved the transplant of operating system.Then,basing on the operating system platform,the thesis has completed the underlying software implementation of communicating module of gateway system,which mainly includes the transplant of TCP/IP protocol software and software implementation of communicating module of control area network(CAN).At last,this thesis has designed a gateway application program with simple functions,built a test platform of the gateway system,and verified the data transmission function of the automotive gateway system connecting a heterogeneous network achieved by this thesis.