基于串行外设接口实现扩展串口的设计

Design on Extending Serial Ports Based on Serial Peripheral Interface

针对串口在通信和军事等领域应用广泛,处理器串口较少,提出了处理器扩展串口的需求。介绍了基于串行外设接口实现扩展串口的总体设计,然后从设计的硬件组成、原理组成框图、硬件设计、软件设计等方面进行了详细的描述,重点介绍了设计中需要解决的问题。设计完成后经测试证明,完全满足串行数据传输的要求,性能可靠。

Serial Communication is widely used in civil communication and military communication fields, and the serial interface is lack in processor, so the extending serial ports are needed to meet the requirements. The paper introduces system design based on SPI, then the structure of hardware, the design of software are depicted in detail, and focusing on the problems occurring in the design. The test resuh shows that the design can satisfy the requirement for transmission of serial data and has reliable performance.