On September 27, children will face the GESP C++ Level 1 exam. Here, we summarize common exam points and common mistakes for this level, allowing students to identify gaps in their knowledge and strive for a score of 90 or above. The explanation is quite detailed, so please read patiently. In this era of short … Read more
The RS-232 standard was jointly established by the Electronic Industries Association (EIA) of the United States and companies like Bell Systems in 1970, originally aimed at standardizing serial binary data exchange between Data Terminal Equipment (DTE) (such as computers) and Data Communication Equipment (DCE) (such as modems). It employs serial communication, transmitting data one bit … Read more
1. Basic Actions 1. The first injection of plastic is done at low speed, moving the nozzle away from the cold material head before increasing the second-stage injection speed to fill the mold cavity. This shortens the time for the plastic to flow to the end of the gate, maintaining the lowest viscosity of the … Read more
Author: billpchen, Frontend Developer at Tencent Kandian After the HTTP/2 standard was published in 2015, most mainstream browsers supported this standard by the end of that year. Since then, with advantages such as multiplexing, header compression, and server push, HTTP/2 has gained increasing favor among developers. Unbeknownst to many, HTTP has now evolved to its … Read more
(Add Frontend Encyclopedia to your favorites to enhance your frontend skills) Author: billpchen, Frontend Development Engineer at Tencent Since the HTTP/2 standard was published in 2015, most mainstream browsers have supported this standard by the end of that year. With advantages such as multiplexing, header compression, and server push, HTTP/2 has gained increasing favor among … Read more
In the previous section, we wrote our first Shell script and learned how to use variables, read input, and pass parameters. In this article, we will continue to delve deeper into the “core capabilities” of Shell:Flow Control. Shell supports control structures similar to other programming languages: conditional judgments, loops, branches, etc., allowing you to write … Read more
1. Overview L2CAP: Logical Link Control and Adaptation Layer Protocol The structure and position of L2CAP in the protocol stack are shown in the figure below: 1.1 Channel Manager The Channel Manager provides control plane functionality and is responsible for all internal signaling, L2CAP peer signaling, and signaling interactions with upper and lower layers. 1.1.1 … Read more
UART in Embedded Communication Protocols In the first phase, we have mastered the basic theory and preliminary practice of UART, including the basic concepts of frame structure and baud rate. Now, we will delve into the configuration details of the UART protocol, particularly focusing on the calculation of baud rate error and the application of … Read more
(Add a star to BoLe Online to see classic articles) Source: Ruheng Link: https://juejin.im/post/6844903490595061767 1. TCP/IP Model The TCP/IP protocol model (Transmission Control Protocol/Internet Protocol) consists of a series of network protocols that form the foundation of the Internet and is the core protocol of the Internet.The reference model based on TCP/IP divides the protocols … Read more
The following article is a summary of common knowledge in Shell programming, covering syntax and techniques. 1. Basic Concepts of Shell 1. Introduction The Shell is a command-line interpreter, an interface for users to interact with the kernel, receiving user-input commands and invoking system functions for execution. The Shell is loaded into memory when logging … Read more