Programmer Group

Abstract: this blog introduces a method that STM32 uses a timer channel to control any IO to output the same PWM wave. The hardware platform used in this paper is STM32F407VET6. The codes of other types of platforms may be different, but the principles are general. Implementation principle: we all know that STM32 can directly output PWM wa ...

composer require whereof/think-csv $users = User::select(); // All users $csvExporter = new \whereof\think\csv\Export(); $csvExporter->build($users, ['email', 'name'])->download(); Create CSV $exporter - > build ($modelcollection, $fields) requires three parameters. The first is the model (a collection of models), the second is t ...

0. Project construction Still the same, let's build a new project first   mybatis-04-annotation  ， Copy and paste all the files from the previous project and simplify them. Streamlined code, just streamline it   mybatis-config.xml   You can: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration ...

1, Recommended column Lecture 100 on zero basis of algorithms (Lecture 31) multidimensional enumeration (I) - Introduction          2, Multidimensional enumeration   multidimensional enumeration is actually nesting loops, such as two-dimensional enumeration: nesting a for loop in a for loop. #incldue <stdio.h> int main(){ i ...

Learning reference Videos: [crazy God says Java] Redis Redis 1, Overview of redis redis is a non relational database. 1. Introduction to non relational database A non relational database, that is, NoSQL (Not Only SQL). Relational database: column + row. The data structure under the same table is the same. Non relational database: data ...

What is the pointer In computer science, a pointer is an object in a programming language. Using an address (memory number), its value directly points to a value stored in another place in computer memory. Since the required variable unit can be found through the address, it can be understood that the address points to the change unit. The ...

A stack is a linear table that can only be inserted or deleted at one end. (linear table with limited operation)          The stack can only insert or delete elements at the end of the table. The end of the table is the top of the stack, and the header is the bottom of the stack Main features of stack: ...

Note before VTK notes - graph correlation - segment smoothing - vtkSplineFilter class I learned that vtkSplineFilter class is used to refine the input data of multiple line segments and output a set of points with more line segments; vtkSplineFilter can be used not only for interpolation, but also for sampling; The interpolation or sampling met ...

Call the SFML class and draw several small shapes to the window. (window class, shape class) #include <SFML/Graphics.hpp> int main() { //create a window sf::RenderWindow window(sf::VideoMode(640, 480), "SFML Application"); //create a circle shape sf::CircleShape cShape; cShape.setRadius(40.f); cShape.set ...

Hello, as a beginner of machine learning, I participated in 2021 iFLYTEK AI developer competition some time ago. The team name is "write a story" I participated in the big data competition for the first time. I mainly chose the relatively easy structured data competition. Among the five competitions, three entered the top five (advert ...