In modern embedded systems, CAN bus (Controller Area Network bus) has become an influential communication protocol with its excellent performance and wide applicability. Originally developed by Bosch in Germany in the 1980s, CAN bus is now widely used in automotive electronics, industrial automation, medical equipment and agricultural machinery.
Core features of CAN bus
1. Multi-host and broadcast communication
CAN bus is a multi-host network protocol that allows multiple nodes to communicate on the same bus. It uses a broadcast communication mechanism, and all nodes can receive every piece of data on the network. This design simplifies the system structure and improves the flexibility of data transmission.
2. Priority arbitration
CAN bus handles access requests from multiple nodes through an identifier-based priority arbitration mechanism. The lower the identifier of the data frame, the higher the priority. During data transmission, high-priority frames are sent first, thereby reducing data delay and optimizing communication efficiency.
3. Efficient error detection and processing
In order to ensure the reliability of data, CAN bus implements a variety of error detection and processing mechanisms, including bit errors, fill errors, CRC check errors, etc. When a node detects an error, it will automatically issue an error flag and retransmit the data to ensure the accuracy of communication.