Abstract : With the rapid development of information technology, embedded technology is being rapidly applied to various fields such as smart home appliances and consumer electronics. The LM3S1138 is Luminary Micro's first controller based on the ARM Cortex-M3. It has multiple built-in programmable synchronous serial interfaces (SSIs), which can easily implement the SPI interface protocol to drive the CAN controller MCP2510, achieving stable and reliable CAN bus communication. This solves the problem of using CAN communication in micro-industrial control products based on the LM3S1138. This paper first provides a brief introduction to the LM3S1138 microcontroller and the MCP2510 CAN controller, then analyzes in detail the structure and working principle of the main controller's SSI module. Finally, it provides a detailed analysis and explanation of the hardware circuit and interface initialization of the communication interface between the main controller and the MCP2510, and also provides the main flowcharts for data transmission and reception, as well as communication test methods. Keywords : Embedded systems; LM3S1138; SPI bus; CAN communication 1. Introduction Embedded technology is a fusion of various advanced technologies such as computer technology, electronic technology, and semiconductor technology. With the rapid development of computer and communication technologies, the rapid popularization of the Internet, and the accelerated convergence of 3C technologies, embedded technology has become one of the most vibrant technologies of our time. It possesses outstanding characteristics such as high reliability, small size, low cost, low power consumption, strong vitality, and suitability for industrial applications. Therefore, embedded technology has widely penetrated into many fields such as scientific research, engineering design, and military industry, as well as various aspects of people's lives. Meanwhile, CAN bus technology has extremely strong anti-interference and error correction capabilities, effectively supporting distributed real-time systems with high security levels. Therefore, researching embedded systems and CAN bus communication has significant practical implications. [Full text download of the design of CAN communication between embedded LM3S1138 and MCP2510]