In the RK3562 Buildroot Linux system environment, we switch between two cameras to capture their data and display it on the LCD screen. Each time we switch between cameras, we stop the capture operation of the original camera, then capture from another camera, and directly write the camera data to the framebuffer for display.We use … Read more
1. Core Concepts of Zero-Copy Technology in C++ Zero-copy is an important optimization technique aimed at reducing unnecessary data copying in memory, thereby improving program performance, reducing memory usage, and decreasing CPU consumption. In C++, zero-copy techniques are implemented in various ways, including reference semantics, view types, and move semantics. 2. Introduction to std::string_view std::string_view … Read more
In-Depth Analysis of Memory Mapping in Linux Device Drivers 1. In-Depth Analysis of Working Principles Memory mapping (Memory Mapping, <span>mmap</span>) is a method that directly maps device memory or driver kernel buffers into the user process address space. The core idea is: to establish a direct mapping from a virtual memory area (VMA) to physical … Read more
“ Memory mapping is the design in which the MCU assigns unique addresses to memory and peripheral registers, similar to assigning house numbers to resources, allowing the CPU to interact precisely. It is divided into unified addressing (shared address space) and independent addressing (address isolation). Modern architectures focus on unified addressing, complemented by enhanced mechanisms … Read more
Disclaimer: The images in this article are sourced from the internet. Please contact us for removal if there are any copyright issues. Why can the CPU control hardware so precisely? The secret lies in memory mapping! It assigns a unique address “house number” to all components in the chip, such as memory and peripherals. The … Read more
Memory Mapping Techniques and Application Examples in C Language In modern operating systems, memory mapping is an efficient method for file I/O operations. It allows programs to directly map files or devices into the process’s address space, enabling access to file contents as if they were memory. This technique is particularly effective when handling large … Read more
Memory-Mapped File Operations in C Language A memory-mapped file is a technique that maps the contents of a file directly into the process’s address space. This allows the program to access file data as if it were accessing memory, thereby improving I/O efficiency. In C language, we can use the mmap function to perform memory-mapped … Read more
An embedded Linux system can typically be divided into four layers from a software perspective:1. Boot Loader.It includes the boot code (optional) embedded in the firmware and the Boot Loader itself.2. Linux Kernel.A customized kernel specific to the embedded board and the kernel’s boot parameters.3. File System.Including the root file system and file systems built … Read more
Source: MCU Fun ID: mcu168 An embedded Linux system can typically be divided into four layers from a software perspective: 1. Boot Loader. This includes the boot code embedded in firmware (optional) and the Boot Loader itself. 2. Linux Kernel. A customized kernel specific to the embedded board along with kernel boot parameters. 3. File … Read more
An embedded Linux system can typically be divided into four layers from a software perspective:1. Boot Loader. This includes the boot code (optional) embedded in firmware and the Boot Loader itself.2. Linux Kernel. A customized kernel specific to the embedded board along with kernel boot parameters.3. File System. This includes the root file system and … Read more