Learning Keil5: Introduction to C Language Programming

# 1. Introduction to Keil5 Integrated Development Environment

1.1 What is Keil5

Keil5 is an integrated development environment (IDE) designed for embedded systems development, developed by the German company Keil. It offers a powerful set of tools, including C compilers, debuggers, and simulators, which can greatly facilitate the process of embedded software development for developers.

1.2 Features and Advantages of Keil5

- Keil5 boasts an intuitive user interface, making it easy to learn and operate.
- It supports various microcontroller architectures, such as ARM, 8051, etc., making it widely applicable.
- It integrates robust compilers and debuggers, enabling quick compilation and debugging of programs.
- It provides a wealth of software components and sample code, facilitating learning and reference for developers.

1.3 Installation and Configuration of Keil5

To install Keil5, you can download the installer from the official website and follow the installation wizard's instructions. Once installed, you need to configure the relevant development tools and target device information for development and debugging purposes. Keil5 supports various external debuggers and simulators, which can be configured according to actual needs.

With this introduction, we can gain a basic understanding of the Keil5 integrated development environment. Next, we will delve into the knowledge related to C language programming.

# 2. A Review of Basic C Language Knowledge

Before writing C language programs in the Keil5 integrated development environment, it is essential to review the basic knowledge of C language, including an overview of C language, variables and data types, conditional statements and loop structures, as well as functions and arrays. Let's start with these foundational topics.

# 3. Keil5 Project Structure and Creating a New Project

In the Keil5 integrated development environment, projects are the basic units for organizing code and resources. Here, we will introduce the structure of Keil5 projects and how to create a new one.

#### 3.1 Composition of a Keil5 Project

- **Source Files**: A place to store source files, typically including .c (C code files) and .h (header files);
- **Header Files**:存放头文件，用于声明函数、变量等；
- **Startup**: 包含启动文件，必须有一个主函数（entry point）；
- **Target**: A place to store generated target files, executable files, and related linking files;
- **Settings**: Contains project configuration settings, such as chip type, compiler options, etc.

#### 3.2 Creating a New Project

1. Open Keil5, click "Project" -> "New µVision Project", select the path to save the project and name the new project;
2. Select the chip model, click "OK";
3. In the "Project" tab, right-click "Target 1", choose "Set As Main Project";
4. In the "Project" tab, right-click "Target 1", choose "Manage", right-click "Source Files" in "Group" -> "Add New Item to Group 'Source Files'", and add a .c file;
5. Write code and save.

#### 3.3 Configuring Project Properties

1. In the "Project" tab, click "Options for Target" to configure target options, such as chip configuration, output filenames, etc.;
2. In the "Project" tab, click "Options for Target", select the "C/C++" tab, and configure compiler options;
3. In the "Project" tab, click "Options for Target", select the "Debug" tab, and configure debugging options;
4. Click "OK" to save the configuration.

With these steps, we can successfully create a new Keil5 project and configure the corresponding properties, preparing for subsequent C language program writing and d