运行于嵌入式环境中的RTOS要求应用软件具有与操作系统同样的可靠性,这种设计思路对应用开发人员提出了更高的要求,同时也要求操作系统自身足够开放。
的“木桶原理”告诉我们,局部的不足会导致整体的缺陷。要保证系统的可靠性,必须保证系统中每一个部分都是可靠的,任何部分的不可靠都会导致系统整体的不可靠。大多数桌面系统都是上千万行代码的庞大而复杂的系统,即使有源代码程序员也难以把握。而且对开发人员来说,桌面系统庞杂的细节是隐蔽在一个个的固定的接口下的,是一个黑箱,很难把握具体执行的线索。即便其内核是足够可靠的,但它的应用环境复杂多样、千差万别,其中常常有一些应用并不是那么稳定可靠,从而破坏了整体系统的可靠性。相反,RTOS对软件开发人员来说是完全开放的,是一个白箱,允许开发人员清楚地了解和掌握操作系统内部情况,对存储器中的每一位和每一个I/O接口进行操作控制,从而可以设计出高效稳定的应用软件。
可编程控制器(PROGRAMMABLE CONTROLLER,简称PC)。与个人计算机的PC相区别,用PLC表示。
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Tektronix AM503B AC/DC Current Probe Amplifier
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