I can’t believe that it is already April, again a late hello to 2023.

Until today I have came to Siemens more than 1 months. My thinking is refreshed again, I had thought it was somehow good to stay at Thundersoft because I had stocks and acted as a manager. After I came here, I don’t need to struggle with the bunch of useless things, and most of the time I can do what I like to do. Also I can have a easier work time, which almost not need to take overtime. Very happy that I decided to abandon my stocks and came here, no doubt that a big difference will be made this year.

Once I am at home, my kid will keep stick on me. Although I am still struggling with how to balance life and learning, I kind of having some ideas to make the balance and enjoy my life.

One day you’ll leave this world behind, so live a life you will remember.
- The Nights . Avicii

This year my main target is to follow my own principles and a I-will-stick-on plan with agile way. Currently my own principles are not done yet, I will publish it once it is done.

Ah… Almost 12:00 PM, I am tired and don’t want to write too much now. So this is it.

Be better, and write the yearly hello on January since 2024.

1. No one needs a vacation more than someone who just took a vacation.
没有比刚刚度过假的人更需要假期的了

2. Reduce non-deliberate leisure and dive into deliberate leisure.
减少被动式休闲，投入到主动式休闲之中

3. Reading is lowest cost social interaction.
读书，是最低成本的社交

4. In-depth reading is very easy to produce peace in heart.
深度阅读非常容易产生高心流

At times, fear may accompany certain things, but with repeated exposure and understanding, that fear dissipates. It’s akin to the fear of sleeping alone as a child; as you grow and become more familiar with the world, that fear gradually fades away.

Reading

If my purpose is to learn, read in following skills:

• Pre-read the book/material super fast.
  • Preview it: Look at headings, subheadings, and any summaries or conclusions to get an overview.
  • Read a book in 4-5 minutes to find out what’s in it, and if it’s anything I need to know.
  • To be able to determine in 5 minutes: Should I even read this? Is this the right book?
• Ask questions.
  • How will I use this?
  • Why is this important?
  • What applications does it have for the problem I’m trying to solve?
  • Look for what I know, and what I don’t know, and need to learn.
    • Don’t waste time learning what I know, I look for what I don’t know and need to learn.
    • Look for what I don’t understand and what is relevant to me.
    • Don’t need to know everything. I only need to know what I need to know. Spent too much time trying to learn everything and then didn’t remember anything.
    • What’s important is knowing the answers to the test questions if you’re in school, or knowing what your supervisors and clients want to know if you’re in business
  • Look for meaning and significance in what confused me, so now I understand it.
• Pay more attention on the key things.
  • The first and last sentence/paragraph.
    • Usually the first tells you what’s coming, and the last tells you what came.
  • Vocabulary.
    • Mainly for the English book or some key concepts.
  • Names, nouns, numbers and verbs.
    • Who’s in the book and what did they do?
    • The people, things and their actions.
    • Any number. Date, statistic or formula.
    • Tables, charts, diagrams and so on.
  • In headers and sub-headers, what are the most important ideas in each section, the big takeaways?
  • What are the questions and answers?
• Utilize recording while reading.
  • Highlight or underline, summarize what you have read.
  • Capture the main points(framework), organize essential data, questions as your read, fill in the highlights and stories.
  • Ask questions, make predictions, and connect what you’re reading to your own experience or knowledge tree.
  • Take notes.
    • What you’re learning?
    • What is your insights?
    • How will you use what you’ve just learned?
    • How did this book grab your attention and excite you?
      • A story, a joke? or anecdote? - more for writing skills.
• Put the book aside and rehearse the content to yourself.
  • Visualize concepts.
    • Picture what you are leaning.
    • Envision yourself being successful at what you’re working on.
    • Imagine anything that helps.
  • Discuss/teach what you read.
• Repetition is the key.

第一次知道《把时间当朋友》应该是两年前吧，当时觉得是可以改变人生轨迹的一本书，所以第一时间就下单买了回来。 买回来后看了一半就束之高阁了，似乎有些收获又似乎没有收获。直到最近逐渐培养出阅读的习惯了，又拿出来从头完整阅读了一遍，前不久刚好读完，虽然存在一些说教和啰嗦的地方，但仍然是一本十分值得一读的书。
作者传达的很多观点，对我来说都很是受用，譬如贯穿全文的“积累”、“坚持”、“思考”。 作者没有真正做过程序员，却有很多程序员的好习惯，也佩服于作者对时间的把控和成事的能力，印象很深刻的是：

1. 不做销售后，坚持 4 个月学习英文，取得托福等考试的高分，并入职新东方。（这种案例挺多，很多比较佩服的人都能下恒心快速学会一个领域的知识并取得成果）
2. 运用技术的能量，完成《TOEFL 核心词汇 21 天突破》并赚取百万有余。
3. 贯穿人生的积累和坚持。英文和其他信息/知识的积累，健身和写作的坚持。

接下来零散地记录一些自己觉得有意思的内容，和自己的想法。

太久没有怎么写东西了，工作忙碌，心中苦闷，家中各种事情变故。如果还是早些年抑郁的自己，估计挺过这艰难的时光会十分不容易吧。老是在感叹时光，自己还是很难珍惜，或许因为自己是个俗人吧，做不到让自己每时每刻都活得有意义，总会不经意间让时间溜掉，然后感叹“逝者如斯夫，不舍昼夜”。

2021

工作

由于工作内容和夸张的办公距离的原因，本来打算在这一年离职，最终也未成行。其实从当前公司离职这个事情想了很久，最终因为一些原因而搁浅，俗人似乎总是这样子（或许只有我自己），离职这类有些重要的事情总是会因为各种原因（更多可能是懒惰和对未知的不安）而被推迟或拖延。在这一年也出去逛了一圈，漂亮得多的工资和对等的期权，不过最终还是选择了留下来，主要有三个考量吧。

• 成为与国外客户直接交流的技术接口人，很贴合一直以来学好英语的意愿。
• 工资加上股票等收入后，整体收入还算不错的。
• 成为 Manager 和项目 Leader，想走出舒适区，挑战一下自己的性格弱点。
  Read more »

What does SDK mean in current context?

很多时候，我们需要闭源一部分源码， 然后再把整个源码仓库共享给指定人员。这个源码仓库就称之为 SDK。

How to make SDK based on Yocto build system

根据目前的调查结论，基于 Yocto 编译系统做 SDK 主要有如下三种方式，本文主要介绍第一种方式，也会稍微介绍下第二、三种方式。

• 将闭源部分源码做成 prebuilt 包;
• 重写 do_install 任务直接安装闭源部分源码生成的 deb 包;
• 将源码编译成二进制并替换，修改 Makefile 文件。

最开始倾向于以 2、3 的方式来做 SDK， 深入调查后发现 1 才是最合适的方式，原因有三：

• 高通有开发一个基于 qprebuilt.bbclass 类来实现的半成品 prebuilt 功能， 而且高通的闭源源码也是按照这种方式处理的。
• 直接安装预编译的 deb 包是一个糟糕的决定，会给以后带来很多不确定性和不可追溯性。
• 编译二进制并替换的方式在 Yocto 中逻辑更为复杂，且不符合官方推荐的标准做法。

Create Prebuilt tarball

制作预编译包是官方比较推荐的一种方式，详细过程请查看 “Lessons and Gains of making prebuilt sdk” 部分。现以 RB5 LU 为例将准备步骤简单总结如下，其分为两种情况：

• 可以生成中间产物，用中间产物创建；
• 不能生成中间产物，直接取最终产物创建。

我们也可以跳过第一种情况，直接按照第二种方式准备所有模块的预编译包，可以直接跳过如下第 2 步。

1. 找到并修改闭源代码对应的 bb 文件, 添加如下两行代码。

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2
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# RB5 LU 需要修改如下文件：
# poky/meta-qti-bsp-prop/classes/qprebuilt.bbclass
# poky/meta-qti-bsp-prop/recipes-bsp/sensors/sensors-see_git.bb
# poky/meta-qti-bt/recipes/bt-app/bt-app_git.bb
# poky/meta-qti-bt/recipes/bt-cert/bt-cert_git.bb
# poky/meta-qti-bt/recipes/bthost-ipc/bthost-ipc_git.bb
# poky/meta-qti-bt/recipes/fluoride/fluoride_git.bb
# poky/meta-qti-bt/recipes/libbt-vendor/libbt-vendor_git.bb
# poky/meta-qti-camera-prop/recipes/camx/camx_0.1.bb
# poky/meta-qti-camera-prop/recipes/camx/camxlib_0.1.bb
# poky/meta-qti-camera-prop/recipes/camx/chicdk_0.1.bb
# poky/meta-qti-gst-prop/recipes/secure-gst/secure-gst.bb
# poky/meta-qti-robotics-prop/recipes/imud/imud.bb
# poky/meta-qti-sensors-prop/recipes/sensors/sensors-see-qti_git.bb

RM_WORK_EXCLUDE += "${PN}" # 也可以添加所有模块到 local.conf， 譬如： RM_WORK_EXCLUDE += "camx chicdk ..."
inherit qprebuilt # 如果 bb 文件已经继承了此类，就不需要增加此行

Here is the PDF:

在大数据早已普及的今日，尤其随着 5G 技术和移动设备的逐渐普及，各种有线或无线的传输技术也迎来了迅猛发展，内容日新月异、错综复杂，你又能窥探其中多少呢？本文将简单介绍高速影音传输技术 MIPI， 主要基于 CSI-2 。

MIPI（Mobile Industry Processor Interface， 移动产业处理器接口） Alliance， 即 MIPI 联盟发起并为移动应用处理器制定了开放标准和一种规范。主要是手机内部的接口（摄像头、显示屏接口、射频/基带接口）等标准化，从而减少手机内部接口的复杂程度及增加设计的灵活性。MIPI 联盟下面有不同的工作组，分别定义的一系列接口标准，比如 CSI（Camera Serial Interface， 摄像头串行接口）、DSI（Display Serial Interface，显示串行接口）、DigRF（射频接口）、SLIMBUS（麦克风、喇叭接口）等，其优点是更低功耗，更高数据传输数量和更小的空间。

Definitions and Acronyms

This document describes C code style used by Andy Lee in his projects and libraries.

Table of Contents

• Andy Lee’s C coding style
  • Table of Contents
  • General Rules
  • Formatting
    • Indentation
      • Common Case
      • Exception Case
    • Braces, Parentheses and Spaces placement
      • Braces
      • Parentheses
      • Spaces
    • Line Break
    • If then Else Formatting
    • Switch Formatting
  • Naming Also Declaration
    • Make Names Fit
    • File Names
    • Function Names
    • Variable Names
      • Local Variable Names
      • Global Variable Names
    • Type Names
    • Structure Names
    • Pointer
    • Global Constants
    • Macro Names
    • Enum Names
  • Functions
    • Function Prototypes
    • Unwritten Rules
    • Inline Functions
  • Structures
    • Structure Requirements
    • Labeled Identifiers Explained
  • Variables, Macro and Constants
    • Declare counter variables in for loop
    • Floating-point Variables
    • Do Not Put Data Definitions in Header Files
    • Be Cautious With Macros
    • Bad To Affect Control Flow in Macros
    • Namespace Collisions in Macros
  • Miscellaneous
    • No Magic Number
    • No #ifdef in .c file
    • #if is preferred not #ifdef
    • Use Header File Guard
    • Do Not Default If Test To Nonzero
    • Usually avoid Embedded Assignments
    • Use of Goto, Continue, Break and ?:
    • Mixing C and C++
    • Document Null Statements
    • Error Return Check Policy
  • Commenting
    • Comment Style
    • Commenting to Closing Braces
    • Commenting Out Large Code Blocks
    • Include Statement Documentation
  • Documentation
    • Gotcha Keywords
    • File header
    • Function header
    • Formatting
    • How Do They Look Like?
    • Tips and Tricks
      • VS Code
      • Vim
  • Reference

General Rules

In short, consistency matters.

What is life?
Life is what happens to us while we are busy making other plans.

时光匆匆，转眼间，回到成都已经三年多了。这三年来鲜少有时间静下心来认真思考反省，有因为小孩出生前的误诊让自己整夜整夜地难过得想哭，有因为家事让自己感觉喘不过气，也有因为工作的事让自己觉得憋屈失去信心，以及因为种种其他难以言说的压力让自己整夜睡不着觉。还好乐观战胜了悲观，事情总体上都走向了好的方面。

最近这几个月，工作不顺心，家里发生了很多事情，有很多事情想做又做不了，似乎自己又进入了一段艰难的时光，借着周末来梳理梳理（吐槽吐槽），反省反省，也想想后面怎么走。

混乱的大脑

因为家庭和早期抑郁的原因，自己毕业好几年后才想明白怎么做一个有用的人，不辜负这一生。醒悟得太晚最大的弊端就是，需要补的功课太多，然后时间根本不够用。有时候也在想：“当 money 够用时，似乎无论怎么努力，资产都难以有质的飞跃了，似乎也难以迈入 A8，A9 … 要不自己也‘躺平’吧！” 还好自己内心深处还有一簇不安分的火苗。

很多时候也会想想生命、死亡等宏观的话题，每当这个时刻，自己内心中都会有一些畏惧，似乎也有一点对生命真谛的感悟，可惜自己还是差些火候，总是会辜负时间。

工作

工作不顺心是现在惶恐不安的主因，有自己的原因，也有很多公司的原因。首要的一个点是最近公司准备搬家，通勤距离一下变为 40 公里，从没试过这么长距离的通勤。