摘要
ARM体系结构继承了R ISC结构的加载/存储体系结构、固定长32位指令和三地址指令格式等特性。基于ARM架构的Samsung S3C44B0X微处理器一方面具有ARM处理器的低功耗、高性能等优点,同时又具有非常丰富的片上资源,非常适合嵌入式产品的开发。当满足一定的条件时,就可将实时操作系统μC/OS-II移植到ARM处理器S3C44B0X。触摸屏的控制是使用的低功耗和高速率的ADS7843芯片,ADS7843通过同步串口与ARM通讯,通过一些函数及坐标变换,得到体现LCD坐标的触摸屏位置。在此基础上进行触摸屏接口的硬件与软件设计,并给出控制程序流程图。
ARM system structure inherits such characters of RISC （Reduced Instruction Set Computer） as load/store structure, fixed 32 bit instruction and format of three address instruction. RAM based Samsung S3C44B0X Microprocessor has the advantages of low power consumption and high performance of RAM, and also has rich resources in chip which is suitable for the development of embedding product. Under certain conditions, real-time operation system μC/OS-II can be transplanted into S3C44B0X. The control of touch screen is realized through ADS7843 chip which is of low power consumption and high speed. ADS7843 communicates with ARM by synchronization serial, and then obtains position of touch screen which can represent coordinates of LCD. Accordingly, the hardware and software of touch screen interface were designed, and the flowchart of control procedure was listed.
出处
《计算机应用》
CSCD
北大核心
2006年第9期2264-2266,共3页
journal of Computer Applications
