基于SPI和单片机的嵌入式系统扩展方法

The Expansion Method for Embedded System Based on SPI Interface and MCU

介绍了一种通过SPI总线在外围集成单片机,利用单片机对嵌入式系统进行功能扩展的方法。描述了扩展方案的体系结构和工作原理,详细阐述了linux环境下外围设备驱动程序的体系结构和运行机制。以Au1200 soc为例介绍了利用SPI接口和外围单片机对嵌入式系统进行功能扩展的实现过程。

The paper describes an expansion method for embedded system by integrating external MCU through SPI. This paper introduces the hardware architecture and operating principle, and focuses on the architecture and operating principle of device driver for expanded devices under linux. As an example , the paper introduces the realization of expansion for Aul200 SOC with SPI interface and external MCU.