位带技术在STM32程序设计中的应用  

The Application of Bit-Band in STM32 Programming

作　　者：唐飞[1] 王陈宁[1] 查长礼[1] 

机构地区：[1]安庆师范学院物理与电气工程学院,安徽安庆246133

出　　处：《安庆师范学院学报（自然科学版）》2014年第1期54-57,76,共5页Journal of Anqing Teachers College(Natural Science Edition)

基　　金：安徽省自然科学基金资助项目(KJ2013B130)资助

摘　　要：STM32系统的C语言中并未提供直接操作位的方法,需要使用复合语句实现位操作,程序执行效率低。位带技术是一种内存映射技术,将位带区的一"位"映射到位带别名区的一个"字",通过对位带别名区"字"的读取和写入来改变位带区"位"的数值。在嵌入式程序设计中使用位带技术,可以降低代码占用空间,提高程序执行效率,特别适合于大量使用标志位或频繁操作IO口单个引脚的场合。It＆#39;s very difficult to single bit write and read operations in C programming .The low efficiency of program execution is associated with the read-write operation.The Cortex-M3 memory map includes two bit-band regions.These regions map each word in an alias region of memory to a bit in a bit-band region of memory.Writing to a word in the alias region has the same effect as a read-write operation on the targeted bit in the bit-band region.It can reduce the code space and improve the efficiency of pro-gram execution by using the bit-band technology.

关 键 词：位带 嵌入式 STM32 映射 STM32 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]