基于SD卡的单片机软件自更新的实现方法

摘要

为了寻求一种简易可行的方法来实现单片机系统软件的现场升级，提出基于SD卡的单片机软件自更新的实现方法。该设计可以使单片机系统在使用中读取预存在SD卡上的编程文件以实现软件更新，从而简化软件更新的操作流程和硬件需求。该设计亦可以用于智能仪器上数据的现场更新与保存。从硬件方面介绍了单片机与SD卡的接口电路设计，从软件方面重点分析了预加载在单片机中的软件更新引导程序的设计。%To seek a simple and feasible method for realising the update of SCM system software in application,we put forward an implementation method for SCMsoftware self-updating based on SD card.The design can make SCMsystem read in using process the program file pre-stored in SD card to realise the software update,so as to simplify the operation procedures and the hardware demands in software update.The design can also be applied to updating and storing the on-site data of intelligent instrument.In hardware design aspect,in the paper we give an introduction to the interface circuit design between the SCM and the SD card.For software aspect,the emphasis is put on analysing the design of the software update boot program preload to SCM.