Keil5 5.40 Microcontroller C Language Software Installation Guide

Reasons for Recommendation: Why Do Developers Find It “So Good”?

  • 100,000 Lines of Code Compilation: Actual measurement takes only 8 seconds (compared to 25 seconds for a competitor), and the compilation is done before the afternoon tea is ready.
  • Incremental Compilation: Only recompiles modified files, reducing debugging cycle time by 70%.
  • SWD/JTAG Acceleration: Download speed is 5 times faster than Keil4, flashing firmware feels like taking a high-speed train.

💻 Installation Steps

Run the Installer

Enter the extracted folder, right-click on Setup.exe, and select “Run as administrator”.

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Installer Setup

Start the installer and click “Next”

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

License Agreement: Check “I agree…” and click “Next”.

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Installation Location

The default path is C drive; if you need to change it (e.g., to D drive): click “Browse” → change the first letter of the path to D: → click “Next”

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

User Information: Fill in your name, company, etc., and click “Next”

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Wait for Installation to Complete

The installation process takes about 3-5 minutes, please be patient

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation
Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Click “Finish” to complete the installation

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Close the prompt.

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

3. Keil5 Activation Guide

Start Keil Software

Right-click on the Keil icon on the desktop → select “Run as administrator”.

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Open License Management

Click on the top menu bar “File” → select “License Management”

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Return to the extracted folder, right-click on Keygen.exe → select “Run as administrator”

If it cannot be opened:

Check if all antivirus software and Defender are turned off

Right-click on Keygen.exe → Properties → Compatibility → check “Run this program as an administrator”

Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

Generate Activation Code

  1. 1. Paste the previously copied code into the “CID” box of the key generator
  2. 2. Select “ARM” for Target, License
  3. 3. Choose “Professional”
  4. 4. Click “Generate” to create the activation code
  5. 5. Copy the generated activation code into the “LIC” box of Keil
  6. 6. Click “Add LIC”
Keil5 5.40 Microcontroller C Language Software Installation Guide
Keil5 Installation

If you see the message “Successful!” it indicates that the activation was successful.

Keil5 5.40 Microcontroller C Language Software Installation Guide

Usage Recommendations

Update Device Support Packages: It is recommended to update the latest chip support packages through the Pack Installer after installation

Configure Compiler Path: Set the ARM compiler path in Options for Target

Save Workspace: Regularly save Project files to avoid data loss

Hidden Skills of Keil5

  1. Dark Mode: <span>Tools → Customize → Colors</span> to switch, protect your eyes while coding late at night.
  2. Code Templates: When creating a new file, type <span>main</span> to automatically generate a standard code framework (including a <span>while(1)</span> loop).
  3. Virtual Debugging: No hardware needed, just select “Use Simulator” in <span>Project → Options → Debug</span> to simulate execution.
  4. Performance Analysis: <span>Debug → Performance Analyzer</span> allows you to view function execution times, providing a basis for code optimization.

💡 Optimization Tips:

  • Turn off antivirus software: Avoid critical files being mistakenly deleted during compilation.
  • For 4K display users: Adjust DPI scaling to 150% in <span>Tools → Settings → UI</span>.
  • Multi-core Compilation: Check “Use Multiple Core Compiler” in <span>Project → Options → Target</span>.

📥 Download Link

Baidu Cloud:

———

Link:

https://pan.baidu.com/s/1U05usg2lsDTOivO6OvXlLA

Extraction Code:

6666

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