Introduction Have you ever encountered a scenario where the system suddenly freezes under high load, and after debugging, you find that it was due to directly parsing JSON data in the serial port receive interrupt? Or have you noticed that the response time of a certain interrupt is too long, causing delays in executing other … Read more
19.2 Analysis of DMAC Module Block Diagram 19.2.1 DMAC Activation Sources Software triggers, interrupt requests from peripheral modules, and external interrupt requests can all be designated as DMAC activation sources. The DMAC activation source is set in the DMTMD register’s DCTG[1:0] bits. 19.2.1.1 Activating DMAC via Software We can choose to initiate DMA transfers via … Read more
1. Basic Concepts and Background of Linux RT Patches 1.1 Concept of Real-Time and Positioning of Linux RT In modern embedded systems and industrial control fields, real-time performance has become a key indicator of operating system performance. Real-time performance refers to the guaranteed execution time of a specific task, ensuring that the task’s deadline (maximum … Read more
Introduction“Do you understand the interrupt mechanism of Cortex-M?”“How do you implement a memory pool in C?”“How is volatile used in embedded systems?” If you are asked these questions in an interview and cannot answer, you may be eliminated immediately!Embedded development is different from regular software development; interviewers focus heavily on low-level skills.. Today, we reveal … Read more
Public Account “Focus on Linux”, dedicated to Linux kernel development
Introduction: The operating system is the crown jewel of computer science, and the kernel is the gem on that crown. Have you ever dreamed of writing your own operating system? Today, we will guide you through the process of implementing a simple operating system kernel from scratch using the C language! 🚀 Why Choose C … Read more
“Assembly Language” 3rd Edition by Wang Shuang Chapter 12: Internal Interrupts (Page 251) Experiment 12: Writing the Handler for Interrupt 0 Write the handler for interrupt 0, so that when a division overflow occurs, the string “divide error!” is displayed in the center of the screen, and then return to DOS. Requirements: Carefully track and … Read more
Semaphores Cover generated by Nano Banana 🍌🍌🍌 Using<span><span>binary semaphores</span></span> allows deferring tasks (tasks with high processing load and time consumption) in an interrupt to be completed in a processing (synchronization) task, ensuring that ISR() executes quickly. If the task in the interrupt is very urgent, it can be set to the highest priority, allowing the … Read more
Through software development with IO and serial ports, we have already experienced embedded software development. I wonder if anyone is puzzled about why software can control hardware? I certainly had this question when I was learning about the 51 microcontroller. Today, let’s pause software development and analyze how microcontrollers achieve the integration of software and … Read more
Click the blue text above to follow us In embedded systems, although Linux itself is not a real-time operating system, its real-time performance can be significantly improved by implementing PREEMPT-RT patches, rational scheduling, optimizing interrupt handling, limiting kernel interference, and leveraging hardware acceleration. 1 Using Real-Time Linux (PREEMPT-RT) PREEMPT-RT is a set of patches that … Read more