Embedded Development

Detailed Explanation of LCD Driver in Embedded Linux Kernel

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Detailed Explanation of LCD Driver in Embedded Linux Kernel

1 Application Layer Calls to LCD Driver Methods Open the corresponding device node app: open(“/dev/fb0”, …) Major device number: 29, Minor device number: 0 ————————————————————– kernel: fb_open // fbmem.c struct fb_info *info; info = get_fb_info(fbidx); if (info->fbops->fb_open) { res = info->fbops->fb_open(info,1); // Hardware-related driver if (res) module_put(info->fbops->owner); } Obtain variable information (including resolution, etc.) app: … Read more

Keil5 Installation Guide (Keil MDK – ARM 5.40) – A Comprehensive Step-by-Step Tutorial

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Keil5 Installation Guide (Keil MDK - ARM 5.40) - A Comprehensive Step-by-Step Tutorial

1.Download Keil5 ① Quark Cloud Disk download link: https://pan.quark.cn/s/f04fab904da2 ② Baidu Cloud Disk download link: https://pan.baidu.com/s/1nQq_sNxAPmjrxuD4XaBPXg?pwd=x66c 2.Introduction to Keil5 Software Keil MDK-ARM 5.40 is a professional development environment for ARM Cortex-M/R/A series microcontrollers. It integrates the uVision5 IDE, C/C++ compiler, and debugging tools, supporting over 3750 MCUs. It provides CMSIS standard libraries and Device Family … Read more

Creating a Frameworkless HTTP Server in Java Packaged as a JAR for Docker Placeholder

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Creating a Frameworkless HTTP Server in Java Packaged as a JAR for Docker Placeholder

Java Code import com.sun.net.httpserver.HttpServer; import com.sun.net.httpserver.HttpHandler; import com.sun.net.httpserver.HttpExchange; import java.io.IOException; import java.io.OutputStream; import java.io.InputStreamReader; import java.io.BufferedReader; import java.net.InetSocketAddress; import java.util.HashMap; import java.util.Map; import java.util.stream.Collectors; public class SimpleHttpServer { public static void main(String[] args) throws IOException { HttpServer server = HttpServer.create(new InetSocketAddress(8080), 0); server.createContext("/", new EchoHandler()); server.setExecutor(null); server.start(); System.out.println("Server started on port 8080"); } static class … Read more

Installation Guide for Keil uVision 4.22a MDK Version Software with Download Package

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Installation Guide for Keil uVision 4.22a MDK Version Software with Download Package

SoftwareIntroduction Keil uVision 4.22a MDK version is an Integrated Development Environment (IDE) developed by KEIL. Keil MDK, also known as MDK-ARM, Realview MDK, I-MDK, KEIL MDK-ARM, KEIL ARM, uVision5 (older versions include uVision4 and uVision3), is a microcontroller software development platform developed by the well-known German software company Keil (now acquired by ARM), and is … Read more

Idioms Related to ‘Arm’ and Their Explanations

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Idioms Related to 'Arm' and Their Explanations

The Basic Meaning of ‘Arm’ As a noun, the most common meaning of ‘arm’ is “arm; limb”; it can also refer to “weapons; armed forces”; as a verb, it means “to arm; to equip”. Examples of Noun Usage Arm; Limb She held the baby in her arms. (She held the baby in her arms.) Weapons; … Read more

C Language Crash Course 04: A Comprehensive Analysis of Operators from Basic Operations to Hardware Control

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C Language Crash Course 04: A Comprehensive Analysis of Operators from Basic Operations to Hardware Control

C Language Operators: A Comprehensive Analysis from Basic Operations to Hardware Control I am Feri. In my 12 years of embedded development, the precise use of operators directly determines the efficiency and stability of the code. The operator system in C is like the gears of a precision instrument; mastering their engagement rules allows programs … Read more

Can C Language Define Variable Length Arrays? Don’t Joke About It!

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Can C Language Define Variable Length Arrays? Don't Joke About It!

Hello everyone, I am Xiaokang. Today, let’s talk about a severely misunderstood feature of the C language—Variable Length Arrays! Have you heard the saying, “Variable length arrays cannot be defined in C language”? If you believed that, you have been seriously misled! Let’s uncover this widely spread “lie” and get to the bottom of it! … Read more

The Ever-Changing Interfaces of OpenWrt: How Many Do You Know?

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The Ever-Changing Interfaces of OpenWrt: How Many Do You Know?

How many common interfaces of OpenWrt do you know? (Download method at the end)1. luci-theme-Materiale-alphaLogin Interface:Main Interface:2. luci-theme-ArgonLogin Interface:Main Interface:3.luci-theme-BootstrapLogin Interface:Main Interface:4.luci-theme-DesignLogin Interface:Main Interface:5.luci-theme-EdgeLogin Interface:Main Interface:6.luci-theme-KuCatLogin Interface:Main Interface:7.luci-theme-LightblueLogin Interface:Main Interface:8. luci-theme-MaterialLogin Interface:Main Interface:9.luci-theme-OpenWrtLogin Interface:Main Interface:10.luci-theme-Openwrt2020Login Interface:Main Interface:11. luci-theme-TeleofisLogin Interface:Main Interface:Download Tutorial:You can download themes from the software package, select the system on the left, and … Read more

Seamless OTA Upgrade Functionality for MCUs

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Seamless OTA Upgrade Functionality for MCUs

Source | Renesas Embedded Encyclopedia In industrial control, motor drives, and even IoT edge nodes, firmware over-the-air (OTA) upgrades have become a standard for product lifecycle management. However, traditional OTA often comes with downtime, risks, and inefficiencies. The Dual-Bank Flash architecture in Renesas MCUs provides engineers with an almost “zero-perception” upgrade experience. This article takes … Read more

Sharing | My First STM32L552 Development Board

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Sharing | My First STM32L552 Development Board

Original Author: STM32 Chinese Community User Sanjie Dog This is the third review post for the NUCLEO_L552ZE_Q development board. The previous post introduced how to set up the development environment on the Windows platform. Now that the environment is ready, we can start writing programs for testing (I won’t be writing programs myself, as I … Read more