In embedded system development, we often need to manage various hardware peripherals, communication protocols, and sensor devices. The Factory Pattern provides a unified object creation interface, allowing the system to flexibly instantiate different types of objects without exposing the specific creation logic, greatly enhancing the maintainability and scalability of the code. <strong>1. Core Concepts of … Read more
In-Depth Analysis and Practical Guide to the Linux SPI Subsystem 1 Basics of the SPI Protocol: Understanding Hardware Communication Mechanisms The SPI (Serial Peripheral Interface) is a high-speed, full-duplex, synchronous serial communication protocol developed by Motorola, widely used for short-distance communication between microcontrollers and various peripheral devices (such as sensors, memory, display modules, etc.). Compared … Read more
In complex embedded systems (such as multi-device driver frameworks, protocol stacks, state machines), good code organization is often required. By using structures and function pointers, we can simulate the three main characteristics of object-oriented programming in C language: Encapsulation, Inheritance, and Polymorphism. Implementation of Object-Oriented Concepts in C Encapsulation Principle: Encapsulate data and operations on … Read more
In embedded system development, we often need to manage various hardware peripherals, communication protocols, and sensor devices. The Factory Pattern provides a unified object creation interface, allowing the system to flexibly instantiate different types of objects without exposing the specific creation logic, greatly enhancing the maintainability and scalability of the code. <strong>Core Concept of the … Read more
In-Depth Analysis and Technical Practice of the Linux SDIO Driver Framework 1 Overview of SDIO Technology and Linux Subsystem Architecture 1.1 Basic Concepts and Technical Background of SDIO SDIO (Secure Digital Input Output) is an input/output interface standard based on the SD (Secure Digital) memory card standard extension. It is physically and electrically compatible with … Read more
1. I2C Bus Driver / I2C Adapter Driver This section focuses on the structures: i2c_adapter and i2c_algorithm, which are defined in include/linux/i2c.h. The Linux kernel abstracts the SOC’s I2C controller (adapter) as i2c_adapter; i2c_algorithm defines the methods for communication between the I2C controller and IIC devices. The main task of the I2C bus driver, or … Read more
Comprehensive Analysis and Explanation of Linux I2C Device Drivers 1 I2C Hardware Basics and Protocol Overview The I2C (Inter-Integrated Circuit) bus was developed by Philips Semiconductors (now NXP) in the 1980s. It is a simple, bidirectional, synchronous two-wire serial bus widely used to connect microcontrollers and their peripherals. Understanding the hardware basics of I2C is … Read more
In embedded Linux environments with devices, there are two network cards. If A is recognized as eth0 and B is recognized as eth1, sometimes you may want to swap the device nodes (i.e., swap the mapping of A and B to eth0 and eth1, loading as eth0 first and eth1 second). The following methods can … Read more
Adhering to high-quality original content, rejecting content piling, if you like it, please click the star above to bookmark, and you will receive updates immediately, thank you for your attention! In this section, we will begin the explanation of character device drivers. As an introduction, we will discuss the concept of device drivers, and I … Read more
AbstractThis article provides an in-depth analysis of the core driver implementation mechanism of the Loopback sound card (simple, without involving low-level hardware drivers) from the perspective of character device driver development, based on the Linux kernel 6.8.0 and the QEMU simulation environment with AArch64 architecture. It focuses on the registration management of device nodes and … Read more