3AM051.6邵阳市
直到计算机辅助设计发达的,实时在线仿真系统(ICE)仍是进行嵌入式应用系统调试有效的开发工具。ICE可以通过实际执行,对应用程序进行原理性检验,排除以人的思维难以发现的设计逻辑错误。ICE的另一个主要功能是在应用系统中仿真微控制器的实时执行,发现和排除由于硬件干扰等引起的异常执行行为。
ICE带有完善的跟踪功能,可以将应用系统的实际状态变化、微控制器对状态变化的反应、以及应用系统对控制的响应等以一种录像的方式连续记录下来,以供分析,在分析中优化控制过程。很多机电系统难以建立一个有效的数学模型,或是建立模型需要大量人力,这时采用ICE的跟踪功能对系统进行记录和分析是一个快而有效的方法。
嵌入式应用的特点是和现实世界中的硬件系统有关,存在各种异变和事先未知的变化,这就给微控制器的指令执行带来了各种不确定性,这种不确定性只有通过ICE的实时在线仿真才能发现,特别是在分析可靠性时要在同样条件下多次仿真,以发现偶然出现的错误。
I CE不仅是软件硬件排错工具,同时也是提高和优化系统性能指标的工具。ICE工具(如美国NOHAU公司的产品)是可根据用户投资裁剪功能的系统,亦可根据需要选择配置各种档次的实时逻辑跟踪器(Trace)、实时映象存储器(Shadow RAM)及程序效率实时分析功能(PPA)。
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