嵌入式Linux字符的相关内容

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1、unlocked _ioctl接口作用write:往设备写中写数据，单独这个接口并不能满足现实设备的全部控制需求。一个lcd控制器：主要作用就是驱动lcd屏，要显示就是通过write接口把显示数据发给lcd控制器指定的显存。而参数设置类通过write接口设置就可能会和普通的显示数据弄混乱了。为了...

ARM嵌入式学习笔记——Linux字符设备驱动程序设计（三）

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...

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ARM嵌入式学习笔记——Linux字符设备驱动程序设计（二）

Linux内核字符设备驱动的实现过程Linux内核描述字符设备驱动的硬件操作接口数据结构struct file_operations{ open, close, read, write, };Linux内核描述字符设备驱动的数据结构struct cdev{ const struct file_ope...

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...

嵌入式实践教程--【Linux驱动】Linux驱动开发基于Linux4.0+（一）——字符设备驱动

区别于Linux4.0之前的字符设备驱动结构，4.0采用cdev注册字符设备。一、构造一个字符设备结构体，用于cdev的初始化struct led_dev_t{ struct cdev cdev; };二、__init 入口函数1.设备号的处理dev_t led_devno= MKDEV(led_m...

嵌入式Linux开发: 编写EEPROM驱动_采用杂项字符设备框架

一、环境介绍宿主机: Redhat 6.3 32位目标开发板型号: 友善之臂Tiny4412目标开发板操作系统: 使用busybox制作，内核使用官方3.5内核。使用的编译器版本: 友善之臂光盘里自带的交叉编译器版本4.5.1二、EEPROM芯...

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