ATMEL AVR单片机SPI大容量Flash Rom扩展的实现

Realization of high-capacity Flash Rom extension for ATMEL AVR MICU SPI

目的:通过适合小型嵌入式智能化医疗设备的大容量Flash Rom扩展,实现运行过程数据的实时记录和汉字点阵库扩展。方法:利用具备SPI接口的ATmega128单片机和AT45DB161大容量Flash Rom,设计根据静脉麻醉目标浓度实时计算给药注射速率的智能化静脉麻醉控制系统,完成大容量Flash Rom的硬件扩展和基于C语言的模块式Flash Rom读写程序编写。结果 :利用单片机SPI接口外接大容量存储芯片,完成了各种实时数据的快速可靠传输和存储,同时该系统可实现全中文人机交互界面。结论:Flash Rom扩展系统在大屏幕静脉麻醉控制系统中的应用表明,整个系统在复杂电磁环境下运行稳定,满足了智能医疗系统可靠性高、抗干扰能力强、体积小、故障率低的要求,具有较好的读写性能和实用价值。

Objective To realize real-time recording and running operational process data and extension of Chinese character library by high-capacity Flash Rom extension fit for miniature embedded intelligent medical equipment.Methods ATmega128 MICU with SPI interface and AT45DB161 high-capacity Flash Rom were used to develop an intelligent control system for intravenous anesthesia, which could regulate administration velocity based on target concentration. Hardware extension was completed for high-capacity Flash Rom, and modular Flash Rom R/W program was developed based on C language. Results MICU SPI interface with external high-capacity memory chip made the system implement rapid transmission and storage of real-time data as well as man-machine interaction in Chinese.Conclusion Large-screen intravenous anesthesia control system involving Flash Rom extension system runs stably in complex electromagnetic environment, with high reliability, high anti-interference ability, low failure rate, high R/W performance and practical values.