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vxWorks中,驱动函数仅提供几个低级的IO函数来完成简单的数据输入输出操作,而由设备无关的IO系统来处理集体的高级协议和面向块设备的协议。这种结构降低了驱动程序的复杂性,使得驱动程序的编写变得更容易。
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