Reminder: This article briefly reviews the relevant knowledge points of EXTI and NVIC, analyzing the external interrupt callback mechanism of the STM32F1 series microcontroller. Before we start, let’s review some knowledge related to EXTI and NVIC: External Interrupt/Event Controller (EXTI) For interconnect products (series 105, 107), the external interrupt/event controller consists of 20 edge detectors … Read more
Reminder: This article takes external interrupt for lighting as an example, analyzing the usage of interrupt service related functions in the HAL library, their interconnections, and underlying principles. 1. Example Implementation Example Overview: The main function controls LED2 to blink, while the interrupt controls the switch of LED0: First, we use CubeMX to create the … Read more
This article is reproduced from the Jishu Community Jishu Column: Agile MM32 MCU Each external interrupt has a corresponding priority register. The Cortex-M0 has a total of 8 NVIC-IPR registers, with each register managing 4 IRQ interrupts. Therefore, the M0 supports a maximum of 32 IRQ interrupt sources, plus 16 core interrupts, which means the … Read more
01 Application Function Introduction 1.1 • What is an Interrupt An interrupt is a mechanism that temporarily halts the CPU’s normal execution of the main program to handle urgent tasks, after which it returns to the previously paused program, as illustrated below. Figure 1.1 Interrupt Diagram In digital power and motor control systems, the significance … Read more
1. Preemptive Priority and Response Priority The STM32 interrupt vector has two attributes: preemptive priority and response priority, with a smaller attribute number indicating a higher priority level.Preemption refers to the ability to interrupt other interrupts, meaning that it allows for nested interrupts (interrupt B can interrupt the execution of interrupt service function A, and … Read more
While sitting on the high-speed train from Shanghai to Beijing, the long journey indeed makes one feel bored (I couldn’t get a direct train, so I had to go slowly, stopping at each station. It’s frustrating, even in the era of high-speed trains. It reminds me of the time I spent hours on a green … Read more
Follow and star the public account to access wonderful content Compiled by: Technology makes dreams greater | Li Xiaoyao Link: https://itexp.blog.csdn.net/article/details/85029696 Problem Recently, while using the STM32F3 chip, I encountered a problem: If the frequency of external interrupts is fast enough, how to handle the new interrupt if the previous one has not been processed? … Read more
Click the card below to follow Arm Technology Academy This article is selected from the “Arm Technology Blog” column, originally from Zhihu. This series will guide you to learn about the Cortex-M3, including its architecture design, register composition, concepts of clock and bus, functions and usage of various peripherals, etc. Original article: https://zhuanlan.zhihu.com/p/52235675 The Getting … Read more