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
Deep Understanding of Exception Class Hierarchy The C++ Standard Library provides a rich set of exception classes that form a hierarchy. std::exception is the base class for all exception classes, defining a virtual function what() to return a string describing the exception. For example: #include <iostream> #include <exception> int main() { try { throw std::exception(); … Read more
In C++, we often hear the term “exception safety”. It is not only about whether the program runs stably but also closely related to performance. The protagonist we are discussing today, noexcept, is a keyword closely related to exceptions. It can help us optimize program performance, but improper use may also create “hidden traps”. Today, … Read more
C++ exception handling is one of the important features for improving program robustness and maintainability. In C++, resource management is closely related to exception handling, especially in ensuring that resources are correctly released in the event of an exception. In this regard, RAII (Resource Acquisition Is Initialization) is a very important design pattern that uses … Read more
Hello everyone, I’m Liao Wang. Imagine that the world of programming is like a vast, boundless, and mysterious continent full of infinite possibilities, and C language is like a universal key that can help you unlock magical doors on this continent! When you decide to embark on your journey of C language programming and write … Read more
In the following text, locking files and directories refers to adding certain attributes to files and directories, such as read-only. chattr +ia 1. Symptoms of Server Breach Recently, a friend’s server (he set up a website himself) seemed to have been breached, with symptoms including: the server’s CPU resources being at 100% for an extended … Read more
1. Registers CM3 has general-purpose registers R0 to R15 and some special function registers. For general-purpose registers R0 to R12, the initial reset values are unpredictable. 2. CM3 has a set of general-purpose registers from R0 to R15. Note: Most 16-bit Thumb instructions can only access R0 to R7, while 32-bit Thumb-2 can access all … Read more
Work Mode Thread mode: This mode is active when the processor is reset or exits from an exception. Code in this mode can be either privileged or user code, controlled by CONTROL[0]. Handler mode: This mode is entered when an exception (including interrupts) occurs, with all code having privileged access. Code Privileges Privileged access: Full … Read more
Click on the “Chao Ge Quote” above to follow us When encountering module exception issues, apart from returning the device, what else can users do? In fact, not all module exception issues require returning the device. For example, module exception 3 can be resolved easily, while sometimes module exception 4 can be resolved without any … Read more