智能仪表键盘监控的设计与实现

Design and implementation of keyboard monitor for intelligent instruments

在智能仪表中 ,键盘监控软件实现人机对话功能 ,通过键盘设置参数、查询变量、改变显示内容等。文章针对基于DSP的涡街流量计数字信号处理系统 ,介绍了键盘监控程序的设计方法和实现方案。采用非编码键盘 ,根据状态变量法设计键值分析程序 ,采用一键多义完成参数设定和显示内容选择 ,设计出 ADSP2 181与液晶显示器 ( DG12 86 4)的接口电路 ,编制了 L CD显示程序。

The function of man machine talk in the intelligent instruments is achieved through the software of keyboard monitor, including the setting up of parameters, inquiring about the variable and changing of the display content. In this paper,the design and implementation of keyboard monitor are introduced for a digital signal processing system of vortex flowmeter based on digital signal processing (DSP). The non coding keyboard is adopted, the analysis program of key values is designed by using the state variable method, and the setting of parameters and the selection of display are accomplished through defining more than one meaning in one key. The circuit of liquid crystal display (LCD) connected with ADSP2181 is designed, and the display program is developed.