Smart locks, as an important component of the smart home ecosystem, bring great convenience to users’ daily lives, but the accompanying security risks cannot be ignored. In the field of smart locks, the ease of copying card keys is a prominent issue and security concern. In the field of smart access control and locks, the … Read more
In our daily programming, numerical calculations are commonplace, especially when it comes to decimals. However, have you ever encountered such a“supernatural event”: a simple floating-point operation yields unexpected deviations, such as missing 0.1 or having an extra 0.000001? This is not magic, but rather the “pitfalls” of floating-point precision loss in C language! Today, Teacher … Read more
I am Lao Wen, an embedded engineer who loves learning.Follow me to become even better together! Concept of Zero-Length Arrays: As we all know, <span>GNU/GCC</span> has made practical extensions to the standard <span>C/C++</span>, and zero-length arrays (Arrays of Length Zero) are one of the well-known extensions. In most cases, they are used in variable-length arrays, … Read more
1. Introduction The core idea of the factory pattern is to:separate the creation and use of objects. Just like when you go to a store to buy something, you don’t need to worry about how the product is made; you just need to tell the clerk what you need. Since this is a factory pattern, … Read more
“Ubuntu, supported by commercial companies, addresses the pain point of the open-source community’s “free but unguaranteed” model, and now occupies a major share of the global web service market. From Debian to Ubuntu, it has become the successor to the mainline tasks of Unix-like systems.” Review of Unix-like OS 1. Mainline tasks of Unix-like OS: … Read more
One-Dimensional Arrays are collections of elements of the same type. They can be used to store multiple data items, and all data elements can be accessed via a single index. The size of an array is fixed and cannot be changed once defined. 1. Definition and Initialization of One-Dimensional Arrays Definition: In C language, a … Read more
Follow and star our public account for exciting content Source: Internet Makefile is a compilation control file widely used for automating project builds. It defines a series of rules to guide the build process. With Makefile, developers can easily manage compilation, linking, cleaning, and other tasks for large projects. This article will start with the … Read more
[Paid] STM32 Embedded Resource Package The implementation of a state machine essentially involves three elements: state, event, and response. This translates into three questions regarding specific behaviors. What happened? What state is the system currently in? In this state, given this event, what should the system do? There are mainly three methods to implement a … Read more
In the advanced applications of the C language, especially in the field of embedded development, “memory” is often the most precious resource. When we need to handle hardware registers, binary protocols, or massive data storage, ordinary variables occupying 1 byte or 4 bytes can easily lead to resource wastage. Bit-fields (Bit-Field) act like a “space … Read more
In the last lesson, we discussed the float data type, which seems like a simple variable type but actually hides many “mysteries”. Its declaration methods are diverse, and the output results are often unexpected. Today, we will delve into how to use float correctly and unveil the mysterious veil of “precision loss” that may occur … Read more