Vehicle Multi-channel CAN Data Acquisition Based on Lock-free FIFO Queue

Because there are many nodes on the vehicle CAN bus and the bus load rate is large, it is easy to overflow the CAN controller's receiving mailbox and cause frame loss. To solve this problem, a multi-channel CAN data acquisition system is designed based on unlocked FIFO queue algorithm. The software part uses the unlocked FIFO queue algorithm to create a ring FIFO queue for each CAN, and can automatically adjust the queue length according to the current bus load. In the hardware part, STM32 is used as the main control chip, the first three of the eight CAN channels use the MCU's own CAN controller, and the last five channels use the external extended SPI to CAN controller, using SD card as the storage module. The multi-channel data acquisition instrument is realized. The results show that the algorithm can effectively reduce frame loss and improve the efficiency of data acquisition.