Today, while working on an intelligent voice control module, I wanted to reinforce my knowledge of serial communication. Upon reviewing my previous notes, I found them lacking in detail, so I decided to write a new article explaining the principles of serial communication, covering both hardware and software implementations clearly. This will thoroughly clarify the … Read more
Concept of DMA DMA (Direct Memory Access) allows data transfer without direct control from the CPU. It creates a direct pathway for data transfer between RAM and I/O devices, significantly improving CPU efficiency. There are several methods for UART data reception: the interrupt mode of UART isthe most commonly used data transmission method in microcontrollers, … Read more
In today’s digital age, efficient computing is the core driving force behind technological development. The ARM and Linux interrupt systems serve as the key to unlocking this door to efficient computing. The ARM architecture, with its low power consumption and high performance characteristics, is widely used in various devices from smartphones to industrial control systems, … Read more
Many students ask me: Why does my LED light blink while the serial port data reception gets stuck? I want to read data from two sensors simultaneously, why is it that one of them always reads incorrectly? Why can’t my program control the motor while sending data? The most classic question is: why can’t I … Read more
Click 👆👆👆 the blue text Follow “Passion Embedded” In embedded development, especially in the development of microcontrollers like STM32, the <span>volatile</span> keyword is a very important concept. 1. Concept of the volatile Keyword <span>volatile</span> is a type modifier in C/C++ that tells the compiler: The variable may be modified unexpectedly (e.g., by hardware, interrupts, or … Read more
Requirement Description For scenarios that require extremely high real-time response (such as power failure detection), interrupts must be used. However, for the imx6ulx, which is a Linux platform, there are no convenient interrupt operations like those in RTOS. To achieve the same smooth operation, both the kernel driver and the application layer program need to … Read more
Click 👆👆👆 the blue text Follow “Passion Embedded” In embedded development, especially in the development of microcontrollers like STM32, the <span>volatile</span> keyword is a very important concept. 1. Concept of the volatile Keyword <span>volatile</span> is a type modifier in C/C++ that tells the compiler: The variable may be modified unexpectedly (e.g., by hardware, interrupts, or … Read more
1. Interrupt Mechanism of Microcontrollers The interrupt mechanism refers to the ability of a microcontroller to quickly handle external events (interrupt requests) while executing the main program. When an external event A occurs, the microcontroller pauses the current main program (interrupt response), saves the current state data, and then calls the handler for event A … Read more
We often refer to RTOS (Real Time Operating System) as a real-time operating system, but what exactly is a real-time operating system? Is it truly real-time?This question is likely to be on the minds of many beginners. Brief Overview of RTOS RTOS: Real Time Operating System, which means real-time operating system. According to Baidu Encyclopedia: … Read more
Follow our official account and reply with “Introductory Materials” to get a comprehensive tutorial from beginner to advanced on microcontroller programming. The development board will guide you in your journey. Written by: Wu Ji (WeChat: 2777492857) The full text is approximately 5582 words, and it takes about 10 minutes to read. Recently, a participant in … Read more