What is can protocol ?
CAN (Controller Area Network) protocol is a standard communication protocol used in automotive and industrial applications. It was developed by Bosch in the 1980s to provide a reliable and efficient way to communicate between electronic control units (ECUs) in vehicles.
CAN is a serial communication protocol that allows multiple ECUs to communicate with each other over a single bus. It uses a differential two-wire bus (CAN_H and CAN_L) to transmit and receive messages between nodes in the network. The CAN bus operates at a bit rate of up to 1 Mbps and can support up to 8 bytes of data per message.
The CAN protocol uses a message-based communication model, where each message consists of an identifier, data, and control information. The identifier is used to identify the type of message and the sender and receiver nodes. The data field contains the actual data being transmitted, and the control information includes flags for error detection and message priority.
CAN supports two message formats: standard and extended. The standard format uses an 11-bit identifier, while the extended format uses a 29-bit identifier. The extended format allows for a larger number of unique message identifiers, making it more suitable for complex systems.
CAN also includes error detection and fault tolerance mechanisms to ensure the reliability of the communication. For example, each message includes a cyclic redundancy check (CRC) code to detect errors in the transmission, and each node on the bus can detect and recover from errors such as bus-off and error frames.
Overall, the CAN protocol is widely used in automotive and industrial applications due to its robustness, reliability, and scalability.
Where Can i Learn It ?
There are many resources available to learn about the CAN protocol, ranging from books and articles to online courses and tutorials. Here are a few recommended sources to get started:
"Controller Area Network (CAN) Bus J1939" by Wilfried Voss: This book provides a comprehensive introduction to the CAN protocol, including its history, basic concepts, and implementation details. It also covers the J1939 protocol, which is a higher-layer protocol commonly used in commercial vehicles.
"Introduction to CAN" by Kvaser: This online tutorial provides a step-by-step introduction to the CAN protocol, including its physical layer, data link layer, and application layer. It includes interactive examples and exercises to help you understand the concepts.
"CAN Protocol Tutorial" by Vector: This online tutorial provides a detailed explanation of the CAN protocol, including its message structure, error handling, and network topologies. It also includes examples of real-world CAN applications and tools.
"CAN Bus Explained - A Simple Intro (2021)" by EEVblog: This YouTube video provides a simple and visual introduction to the CAN protocol, including its benefits, applications, and message structure. It also includes a demonstration of a CAN network using an oscilloscope and a CAN bus analyzer.
"CAN Bus Basics" by SparkFun: This online tutorial provides a beginner-friendly introduction to the CAN protocol, including its physical layer, data link layer, and message format. It includes practical examples using Arduino and other microcontrollers.
"CAN Bus Analyzer Basics" by Saleae: This online tutorial provides an introduction to using a CAN bus analyzer to debug and analyze CAN networks. It includes examples of capturing and decoding CAN messages, as well as analyzing error frames and bus-off conditions.
Overall, the best source to learn the CAN protocol may depend on your level of experience and learning preferences. It's a good idea to start with a basic introduction and gradually work your way up to more advanced topics and real-world applications.