2
2 目录
1 前言 ................................................................................................................................................................... 1
2 目录 ................................................................................................................................................................... 2
3 项目架构初探 ................................................................................................................................................... 4
3.1 系统架构 ............................................................................................................................................... 4
3.2 硬件说明 ............................................................................................................................................... 4
3.3 代码路径 ............................................................................................................................................... 4
3.4 功能说明 ............................................................................................................................................... 4
3.5 任务分解 ............................................................................................................................................... 5
3.6 内核驱动模块初探 ............................................................................................................................... 5
3.6.1 参考资料 ................................................................................................................................... 5
3.6.2 必选接口 ................................................................................................................................... 5
3.6.3 可选接口 ................................................................................................................................... 5
3.6.4 模块间的调用 ........................................................................................................................... 7
3.6.5 编译错误和解决办法 ............................................................................................................... 9
4 Linux 系统命令和交叉编译 ........................................................................................................................... 10
4.1 Linux 常用命令整理 ........................................................................................................................... 10
4.2 交叉编译环境构建 ..............................................................................................................................11
4.3 uboot 编译和测试 ............................................................................................................................... 13
4.4 Linux 内核编译 ................................................................................................................................... 14
4.5 基于 Busybox 的文件系统编译 ......................................................................................................... 15
4.6 mgtool 文件下载更新 ......................................................................................................................... 17
4.7 单步更新的方法说明 ......................................................................................................................... 18
4.7.1 nandflash 的单步更新 ............................................................................................................. 18
4.7.2 emmc 的单步更新 ................................................................................................................... 21
4.8 总结 ..................................................................................................................................................... 21
5 LED 驱动开发 ................................................................................................................................................ 22
5.1 参考资料 ............................................................................................................................................. 22
5.2 LED 硬件接口和 DTS 设备树 ........................................................................................................... 23
5.2.1 硬件原理图 ............................................................................................................................. 23
5.2.2 设备树实现 ............................................................................................................................. 23
5.2.3 对设备树的操作 ..................................................................................................................... 24
5.3 Linux 内核加载和删除接口 ............................................................................................................... 26
5.4 设备创建和释放 ................................................................................................................................. 26
5.5 设备访问的接口 ................................................................................................................................. 29
5.6 Makefile 编译和模块加载 .................................................................................................................. 31
5.7 测试代码实现 ..................................................................................................................................... 31
5.8 总结 ..................................................................................................................................................... 32
6 设备树的说明 ................................................................................................................................................. 33
6.1 设备树综述 ......................................................................................................................................... 33
6.2 设备树语法 ......................................................................................................................................... 34
6.2.1 #include 语法 ........................................................................................................................... 34
