——What’s the point of moving the Earth into a computer? 1. Let’s simplify the big words “Satellite IoT + Ecological Digital Twin” sounds like science fiction, but it actually involves three things: 1. Satellites in the sky capturing vast images: scanning the entire country every half hour to see where black smoke is rising and … Read more
Cover ImageThe Southern Right Whale Dolphin (Lissodelphis peronii) is a unique species of dolphin that only lives in the Southern Hemisphere, characterized by the absence of a dorsal fin and its black and white coloration.Main ContentIn Linux systems, we often need to execute the sync command after modifying files to save the changes. Why is … Read more
Click the above“Embedded and Linux Matters” Select“Top/Star Public Account” Welfare and valuable content delivered promptly Defensive Programming The reliability of embedded products is naturally inseparable from hardware, but when the hardware is determined and there is no third-party testing, code written with the idea of defensive programming often has higher stability. Defensive programming first requires … Read more
Introduction In the field of computer security, encryption algorithms are one of the key technologies for protecting data integrity and privacy. Among them, MD5 is a widely used hash algorithm, and this article will introduce several use cases of MD5. 1. What is MD5? MD5 is a one-way hash function used to convert input data … Read more
In multi-process or multi-thread programming, file read and write operations may lead to data inconsistency. To avoid this situation, the C language provides a file locking mechanism to control access to the same file. This article will detail the file locking and file sharing mechanisms in C language and demonstrate them through code examples. Basic … Read more
Old Wang Hello, I used a 64G SD card, why can my camera only store for 3 days? Hello, after investigation, your camera’s bitrate is 2M variable bitrate for motion detection recording, and the storage for one day is about 5G. It is very likely that it is an expanded capacity card, and a test … Read more
File Operation Standards in C Language: Safety and Efficiency In the C language, file operations are a very important topic. Whether it is reading data, writing logs, or handling configuration files, mastering the basic standards of file operations is crucial for writing safe and efficient programs. This article will detail file operations in C, including … Read more
False Inspection Reports The National Market Supervision Administration clearly stipulates in Order No. 39, Article 13 of the “Regulations on the Supervision and Administration of Inspection and Testing Institutions” that inspection and testing institutions must not issue false inspection reports. A report is considered false if it contains any of the following situations, and the … Read more
SACP (Snapmaker Advanced Communication Protocol) is the data communication protocol for Snapmaker devices, used for data transmission between the controller, PC (Host), and HMI (Human-Machine Interface). From the design philosophy of this protocol, it can meet the following basic goals: Reliability: Packet header CRC8 check + Checksum data integrity verification Flexibility: Supports request/response mechanism (SACP_ATTR_REQ … Read more
Keccak-tiny: A Lightweight C++ Library Keccak-tiny is a C++ library based on the Keccak algorithm, known for its simplicity and efficiency. The Keccak algorithm is a powerful hashing algorithm widely used in the field of cryptography. Keccak-tiny provides an easy-to-use interface, allowing developers to easily implement secure data hashing in their projects. Next, let’s delve … Read more