基于IAP和USB技术的嵌入式程序升级方法.pdfVIP

6 6 ( ) Vol. 6, No. 6 2 0 0 9 6 Journal of Hunan University( Natural Sciences) Jun1 2 0 0 9 : 1674-2974( 2009) 06-004 1-04 X IAP USB ­ 孟志强 , 朱良焱, 石 瑜 ( , 4 10082) : 对于内带 IAP 功能的嵌入式微控制器LPC2119, 提出了一种基于IAP 和USB 技术的嵌入式 统应用程序升级新方法. 采用U 盘作为程序代码存储设备, 并将微控制器 内部存储器SRAM 和Flash 进行有效的区间分配. 微控制器通过外部扩展的U SB 接口将U 盘中代码读入到微控制器片内SRAM 中相应区间, 再调用微控制器的IAP 功能将SRAM 中代码写入片内相应的Flash 分区中, 实现嵌入式应用程序在线升级. 给出了该方法的详细 实现技术和程序流程图, 该方案使嵌入式应用程序升级相当简单, 受环境影响小. : 嵌入式应用程序; 存储器分配; 程序升级; 在应用编程 : TP 11 :A Embedded Softw are Update Based on IAP and USB ­ MENG Zh-i qiang , ZHU Liang-yan, SHI Yu ( College of Electrical and Informat ion Engineering, Hunan Univ, Changsha, Hunan 410082, China) Abstract: A new embedded softw are update solution based on IAP and USB w as proposed for the microcon- troller LPC2119 with IAP function. Embedded softw are code w as copied from a USB flash disk into on-chip RAM of the microcontroller through an expanded USB interface, and then the code w as w ritten into the on-chip Flash by calling the IAP function of the microcontroller, thus online embedded softw are update w as accom- plished. T he U SB flash disk w orked as a program code storage equipment. The on-chip Flash and the SRAM are divided into a number of storage segments. The realization technology and the flow-chart of this solution w ere introduced. This solution simplifies the embedded softw are update, and is little influenced by the environment. Key words: embedded software; memory allocation; softw are update; IAP( in application progra