Hello everyone, I am the Information Guy~Today, I will share a core system call in Linux: mmap (Memory Mapping), It allows for the direct mapping of files or devices into a process’s virtual address space. Through mmap, three powerful functionalities can be achieved: File access is transformed into memory read/write operations The kernel automatically handles … Read more
Follow and star our public account to access exciting content Source: Online materials Key content: ☆ Linux memory organization structure and page layout, causes of memory fragmentation and optimization algorithms. ☆ Various memory management methods in the Linux kernel, memory usage scenarios, and pitfalls in memory usage. ☆ From the principles and structure of memory … Read more
Click the card below to follow the public account and star it to get my latest shares.Reply in the background Embedded Learning Materials to get a learning package 👇👇👇 Today I saw a question raised by a user on Zhihu: The question included a code example: void func(int *p) { p = malloc(sizeof(int)); // Only … Read more
A Beginner’s Guide to Avoiding Pitfalls in PLC Programming | A Summary from Experienced Engineers In the field of industrial automation, PLCs (Programmable Logic Controllers) are no longer just simple logic control devices; they have become the intelligent control core that integrates data processing, communication, motion control, and various other functions. However, with the richness … Read more
In C programming, memory management is a crucial topic. Effective memory usage not only improves program performance but also avoids potential memory leaks and crashes. This article will introduce several methods to reduce memory usage in C programs, demonstrated with code examples. 1. Use Appropriate Data Types Choosing the right data type is the first … Read more
Scan the code to follow Chip Dynamics and say goodbye to “chip” congestion! Search WeChatChip Dynamics In the world of C language, pointers are the “soul tool”, but ordinary pointers (like int* and char*) are like “custom keys”—a key can only open one lock. However, the void* pointer is like a “universal key”: it can … Read more
Hello everyone, welcome to Lixin Embedded. Recently, while optimizing an industrial control project, I encountered the age-old problem of dynamic memory allocation once again. First, let’s talk about dynamic memory allocation. When coding on a PC, using new to create an object and delete to remove it is quite normal. Not enough memory? Just add … Read more
Introduction: An In-Depth Analysis of FreeRTOS Heap Management Mechanisms—Design and Implementation from Heap_2 to Heap_5 In embedded real-time operating systems (RTOS), dynamic memory management is one of the key factors affecting system stability and performance. FreeRTOS provides multiple heap management schemes (heap_1 to heap_5), each optimized for different application scenarios, involving memory allocation strategies, fragmentation … Read more
Weekend · A Moment of Relaxation Written in Advance I Information printed from the Keil and IAR compilation (Build) window: Program Size: Code=2596 RO-data=268 RW-data=44 ZI-data=1028 72,765 bytes of readonly code memory 3,508 bytes of readonly data memory 20,202 bytes of readwrite data memory 5,676 bytes of CODE memory 926 bytes of CONST memory 1,148 … Read more
The “Readability Crisis” of C++ Compilation Results The assembly code generated from C++ is indeed more complex than that of C, but this complexity follows certain rules: ; C language malloc call push 16 ; allocate size call malloc add esp, 4 ; C++ new operator call push 16 ; allocate size call ??2@YAPAXI@Z ; … Read more