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Linux字符设备驱动硬件操作接口之read接口回顾应用程序read函数ssize_t read(int fd, void *buf, size_t count);功能：从硬件读取数据放到用户缓冲区参数：fd：设备文件描述符，它是字符设备文件代理buf：传递用户缓冲区的首地址。count：传递要读取...

ARM嵌入式学习笔记——Linux字符设备驱动程序设计（二）

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ARM嵌入式学习笔记——Linux字符设备驱动程序设计（一）

Linux设备驱动开发Linux系统调用实现原理作用：实现用户应用程序和内核程序的交互。原理：基于软终端实现。结论：应用程序调用和内核函数之间的调用关系。应用open->C库open->软中断->内核sys_open->应用open返回。应用cloase->C库cl...

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