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
If you don’t want to miss my updates, remember to check the public account in the upper right corner and set it as a star, and take down a star for me. This analysis question still comes from Huawei’s hardware position written test questions. This time we analyze three multiple-choice questions, involving knowledge points: UART … Read more
Follow+Star Public Account, don’t miss wonderful content Source | Renesas Embedded Encyclopedia UART is one of the most common communication methods in embedded development, thus making it a necessary peripheral for many projects. The MCU UART (Universal Asynchronous Receiver-Transmitter) achieving sleep wake-up functionality typically involves low power design, interrupt mechanisms, and UART configuration. Below, we … Read more
During the process of microcontroller programming, if a designer can master multiple programming languages simultaneously, then this designer is certainly a very talented individual. However, it is quite challenging to be proficient in Assembly, C, and C++ at the same time. Many beginners encounter obstacles while learning even one of these languages, leading to frustration. … Read more
I am an embedded developer who has worked on various models of microcontrollers and embedded systems. Sometimes, I often look at programs written by others and frequently find many issues in the details. Although the functionalities achieved are the same, the stability can vary. I would like to discuss some problems I have observed for … Read more
Wu Jianying Microcontroller Development Board Address Shop: 【Wu Jianying’s Shop】 Address: 【https://item.taobao.com/item.htm?_u=ukgdp5a7629&id=524088004171】 1. The pointer to the code area array must also declare the code keyword. For example, for the array unsigned char code arr[30];, to point to it, the pointer must also be declared as unsigned char code *p; Later use found that in … Read more
Follow+Star Public Account, don’t miss the wonderful content Source | Technology Makes Dreams Greater After a week of testing the waters, I’m ready to sit at home and code, and catch up on my writing. Just as I was focused on outputting, my wife interrupted me. The baby is crying, come quickly! There was a … Read more