Multi-channel CAN data acquisition terminal and method for road test vehicle

Abstract

The invention discloses a multi-channel CAN data acquisition terminal and method for a road test vehicle. The method comprises the following steps: 1, setting that a host and a slave have the same SPIsampling frequency and cache; 2, connecting the GPIO ports of the host and the slave , setting the GPIO port of the slave as an output, initializing the GPIO port of the slave into a high level, andsetting the GPIO port of the host as an input; 3, when the slave receives the first frame of CAN data, starting a millisecond counter and sending a timing start notification to the host, adding real-time millisecond time to each frame of CAN data, then packaging the CAN data and putting the packaged CAN data into a cache, and when the cache is full or preset time is up, setting the GPIO port of the slave to be low level; and 4, when the host receives the timing start notification, recording a current timestamp as starting time, and when it is monitored that the GPIO port of the slave is converted from a high level to a low level, reading the data packet in the cache of the slave through a SPI bus, unpackaging the data packet into each frame of CAN data, adding the starting time to the CANdata, and storing each frame of CAN data into a file.

Description

technical field [0001] The invention relates to the field of CAN data acquisition and processing, in particular to a road test vehicle multi-channel CAN data acquisition terminal and method. Background technique [0002] The road test vehicle needs multiple CAN acquisition interfaces, and the data acquisition equipment needs to support multiple CAN acquisition interfaces. Generally, the terminal only supports two CAN acquisition modules at most. If it collects 8 channels, it needs 4 core chips, and the CAN data acquisition Finally, it needs to be analyzed and stored, and the analyzed data is uploaded to the platform, which is convenient for road test vehicle personnel to view and analyze important data. Therefore, it is necessary to gather all CAN data together, and the more chips used in the terminal, the more hardware, The more complex the software implementation, the SPI technology is used between chips for real-time data communication, and data synchronization cannot be ...

AI Technical Summary

Problems solved by technology

[0002] The road test vehicle needs multiple CAN acquisition interfaces, and the data acquisition equipment needs to support multiple CAN acquisition interfaces. Generally, the terminal only supports two CAN acquisition modules at most. If it collects 8 channels, it needs 4 core chips, and the CAN data acquisition Finally, it needs to be analyzed and stored, and the analyzed data is uploaded to the platform, which is convenient for road test vehicle personnel to view and analyze important data. Therefore, it is necessary to gather all CAN data together, and the more chips used in the terminal, the more hardware, The more complex the software implementation, the SPI technology is used for real-time data communication between chips, and data synchronization cannot be guaranteed

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