基于MC9S12XS256的汽车CAN总线主节点设计

Design of Automobile CAN Bus Master Node Based on MC9S12XS256

为解决CAN总线与上位机或PC机的的通信问题,需要设计一个主节点作为转换接口,实现CAN数据转异步串口数据和异步串口数据转USB数据。选择MC9S12XS256和CP2101来设计主节点,简单介绍MC9S12XS256芯片和CP2101芯片的功能,设计了USB转UART串口的传输模块设计和CAN总线的传输模块,并通过调试验证了主节点设计方案是可行的。

In order to solve the communication problems between CAN-bus system and host PC, a master node is needed to design as conversion interface to achieve CAN date transfer to UART （late and UART date transfer to USB （late. MC9SI2XS256 chip and CP2101 chip were selected to design the master node. The functions of MC9SI2XS256 ehip and CP2101 （：hip were introdueed. The USB to UART serial transmission module and CAN bus transmission module were designed. It is proved the master node design is feasible through debug.