电控发动机ECU中的SPI主从式多节点通信设计

分析了电控发动机ECU的控制芯片与外围芯片的通信需求,应用F28035设计出一种SPI主从式多节点通信结构。在SPI硬件设计中,F28035作为主设备,EEPROM、TLE8209、CJ125等器件为从设备,构成主从式通信网络,其中F28035通过译码器选定器件。根据具体芯片特性进行SPI工作模式配置与读写驱动程序编写,在内部开发的双燃料发动机ECU上成功运行,完成通信和诊断等工作。

Design of SPI master-slave multi node communication electronic controlled engine in ECU

This paper analyses the communication needs between control core and peripheral chips on ECU of electronic controlled engine, and designs a SPI master-slave mode multi-node communication structure with application of F28035. On SPI hardware design, F28035 is used as master equipment and selects chips by a decoder; EEPROM, TLE8209, CJ125 as slave equipment; so a master-slave mode communication network is composed. According to specific characteristics of the chips mentioned above, configure the SPI work mode and program the drivers. Our works is running successfully on a dual-fuel engine ECU, and completes communication and diagnostic tasks well.