基于DSP和FPGA的CAN总线通信系统设计

A Design of CAN Bus Communication System Based on DSP and FPGA

摘要:

为了提高高速条件下数据传输的稳定性和可靠性,文章提出了运用DSP与FPGA相配合的方式,控制CAN总线实现数据传输；系统采用SJA1000作为CAN总线控制器；采用PCA82C250作为CAN总线收发器；采用特有并行处理方式的FPGA实现对CAN总线控制器读写、使能等信号的控制；采用数据处理单元DSP与CAN总线控制器直接进行数据传输,省去了数据在DSP与FPGA之间传输的时间；采用两片74LVC4245完成3.3 V TTL标准信号与5 V COMS电平信号之间的转换；实验结果表明,系统数据传输过程稳定可靠,可以基本满足高速信号的处理与传输要求。

Abstract:

In order to improve the stability and reliability of high-speed data transmission conditions, the paper proposes the use of DSP and FPGA compatible manner, control CAN bus for data transfer. System uses a CAN bus controller SJA1000; using PCA82C250 as CAN bus transceiver; using the unique parallel processing FPGA implementation of the CAN bus controller to read and write, so that control energy and other signals; using a data processing unit DSP and CAN bus controller direct data transmission, eliminating the need for data transfer between the DSP and the FPGA time; 74LVC4245 complete the conversion using two standard signal level signal and 5 V COMS between 3.3 V TTL. Experimental results show that the system is stable and reliable data transmission, processing and transmission can basically meet the requirements of high-speed signals.