校招 未知部门 / 硬件工程师 / 一面/二面

<h2>小米 一面二面面经</h2> <p><span>一面</span></p><p><span>（1）自我介绍</span></p><p><span>（2）通信协议了解过吗（SPI，I2C，UART）？选一个你熟悉的说一下，我选的是I2C协议（必须要真的懂时序）。</span></p><p><span>（3）I2C协议你是用到哪里的，代码怎么实现的？</span></p><p><span>（4）Linux下I2C驱动编程：I2C核心层、I2C总线层、I2C驱动层</span></p><p><span>（5）platform 与 设备树的区别</span></p><p><span>（6）linux 下怎么获取到设备树中硬件（板级）的信息</span></p><p><span>（7）TCP，UDP的不同之处，socket套接字编程了解吗，TCP服务器端的编程步骤，UDP和TCP socket编程哪里不同</span></p><p><span>（8）I/O复用，select、epoll，poll的区别</span></p><p><span>（9）linux字符设备驱动程序的设计流程，file_operations 中read write，应用程序怎么读取到字符设备中的数据；</span></p><p><span>（10）系统调用的过程？platform 总线驱动的设计？mmap函数？</span></p><p><span>（11）UART串口有时钟线吗，他是怎么保证数据发完之后对方知道你发完的，UART怎么保证数据的准确性；</span></p><p><span>（12）多个进程访问同一个文件时，文件描述符是一样的吗？</span></p><p><span>（13）uboot的启动流程了解吗；stage1 和 stage2 。uboot源码看过吗，其中的数组？（uboot代码必须理解）</span></p><p><span>（14）添加过uboot中的命令吗？linux文件系统的格式.</span></p><p><span>（15）多线程通信</span></p><p><span>（16）共享内存，进程间通信方式， 共享内存如果发生泄漏，怎么查看？ipcs -m?</span></p><p><span>（17）创建的设备文件 /dev/下的，读取时文件描述符一样吗？</span></p><p><span>（18）算法相关：反转链表，链表的头插和尾插法；</span></p><p><span>（19）画过原理图吗，用什么软件画的，AD？ 那在AD软件中在如果根据原理图上的器件快速选中PCB图上的器件</span></p><p><span>（20）了解Makefile吗，Makefile语法格式？</span></p><p><span>（21）struct结构体的大小，字节对齐、数组 sizeof()大小；</span></p><p><span>二面</span></p><p><span>（1）给定一个字符数组，求它的 sizeof 的大小，字节对齐之类的；</span></p><p><span>（2）linux内核源码看过吗？linux内核启动流程，叙述一下；</span></p><p><span>（3）uboot源码看过吗？uboot的加载引导过程；</span></p><p><span>（4）linux内核移植做过吗，当时做的是哪一块的移植？</span></p><p><span>（5）linux文件系统有哪些？</span></p><p><span>（6）linux内核目录结构，linux查看内存的命令。</span></p><p><span>（7）自旋锁和互斥量的区别；</span></p><p><span>（8）还有一些比较简单的C语言知识，冒泡排序之类的</span></p><p><span>（9）在linux内核里怎么分配动态内存（kmalloc，内核中怎么创建线程：kthread_create）</span></p><p><span></span></p><h2>嵌入式软件工程师面试完全指南</h2><p>面经一共3<strong>2篇文章，12w+字数</strong>，包含全部最新的面试必问考点，<strong>4.7w+同学学习，2800+订阅</strong>，非常适合在找工作面经薄弱的同学，3200+订阅还会涨价，提前订阅提前享受，持续更新中。</p><p>原帖链接：<a href="https://gw-c.nowcoder.com/api/sparta/jump/link?link=https%3A%2F%2Fgw-c.nowcoder.com%2Fapi%2Fsparta%2Fjump%2Flink%3Flink%3Dhttps%253A%252F%252Fgw-c.nowcoder.com%252Fapi%252Fsparta%252Fjump%252Flink%253Flink%253Dhttps%25253A%25252F%25252Fgw-c.nowcoder.com%25252Fapi%25252Fsparta%25252Fjump%25252Flink%25253Flink%25253Dhttps%2525253A%2525252F%2525252Fgw-c.nowcoder.com%2525252Fapi%2525252Fsparta%2525252Fjump%2525252Flink%2525253Flink%2525253Dhttps%252525253A%252525252F%252525252Fgw-c.nowcoder.com%252525252Fapi%252525252Fsparta%252525252Fjump%252525252Flink%252525253Flink%252525253Dhttps%25252525253A%25252525252F%25252525252Fgw-c.nowcoder.com%25252525252Fapi%25252525252Fsparta%25252525252Fjump%25252525252Flink%25252525253Flink%25252525253Dhttps%2525252525253A%2525252525252F%2525252525252Fgw-c.nowcoder.com%2525252525252Fapi%2525252525252Fsparta%2525252525252Fjump%2525252525252Flink%2525252525253Flink%2525252525253Dhttps%252525252525253A%252525252525252F%252525252525252Fgw-c.nowcoder.com%252525252525252Fapi%252525252525252Fsparta%252525252525252Fjump%252525252525252Flink%252525252525253Flink%252525252525253Dhttps%25252525252525253A%25252525252525252F%25252525252525252Fgw-c.nowcoder.com%25252525252525252Fapi%25252525252525252Fsparta%25252525252525252Fjump%25252525252525252Flink%25252525252525253Flink%25252525252525253Dhttps%2525252525252525253A%2525252525252525252F%2525252525252525252Fgw-c.nowcoder.com%2525252525252525252Fapi%2525252525252525252Fsparta%2525252525252525252Fjump%2525252525252525252Flink%2525252525252525253Flink%2525252525252525253Dhttps%252525252525252525253A%252525252525252525252F%252525252525252525252Fgw-c.nowcoder.com%252525252525252525252Fapi%252525252525252525252Fsparta%252525252525252525252Fjump%252525252525252525252Flink%252525252525252525253Flink%252525252525252525253Dhttps%25252525252525252525253A%25252525252525252525252F%25252525252525252525252Fgw-c.nowcoder.com%25252525252525252525252Fapi%25252525252525252525252Fsparta%25252525252525252525252Fjump%25252525252525252525252Flink%25252525252525252525253Flink%25252525252525252525253Dhttps%2525252525252525252525253A%2525252525252525252525252F%2525252525252525252525252Fwww.nowcoder.com%2525252525252525252525252Fcreation%2525252525252525252525252Fmanager%2525252525252525252525252FcolumnDetail%2525252525252525252525252FMJNwoM">https://www.nowcoder.com/creation/manager/columnDetail/MJNwoMc</a></p><p></p>