This article is selected from the Extreme Technology column “Arm Technology Blog” and is authorized to be transferred from the WeChat public account Lao Qin Talks about Chips. Previously, we sharedinterrupts and how they are handled in the ARM architecture and GIC-600 related knowledge; this article will introduce redistributor related knowledge. Keep it simple, keep … Read more
Click the blue "Arm Selection" in the top left corner and select "Set as Favorite" 1. Interrupt Response Model of 51 Microcontroller Let’s recall the use of interrupts in microcontrollers. As shown in the figure below, on the left is the pin diagram of the 51 microcontroller, where P3.0-P3.5 are the corresponding interrupt pins. When … Read more
Introduction In serial communication applications, we often use receive and transmit interrupts, which most of you are familiar with. There is a very useful interrupt that may be overlooked, which is the bus IDLE interrupt. When a frame of data transmission ends, the bus will maintain a high level state, at which point the MCU’s … 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. Interrupts: The “Emergency Contact” Between Devices and Processors In the complex operation of computer systems, interrupts are a crucial technology. Simply put, an interrupt is when the computer pauses the currently running program to execute a related service program upon encountering an urgent event that needs to be processed. Once completed, it automatically returns … Read more
Asynchronous programming can create efficient programs that are fast and resource-saving. It allows high concurrency in a single-threaded environment and can implement TCP/IP protocol stacks without an operating system. Fast and resource-efficient, it can keep power consumption at the lowest level, making asynchronous programming the best programming model for low power design. Three Realms There … Read more
Someone used the STM32F4 chip to validate the SPI functionality. When using two on-chip SPI modules for transmission and reception based on interrupts, it was found that there was always a loss of received data, seemingly losing the last 2 data points. The code used the HAL library’s API functions. What could be the reason? … 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+Star PublicAccount, don’t miss out on exciting content Author | strongerHuang WeChat Public Account | strongerHuang The UART serial port is a common communication method in embedded development, but many people still do not know how to use the serial port. Today, I will share a few points about serial ports: Serial Port Receiving Methods … Read more