The Ultimate Embedded Button Detection Solution: A Struct to Handle All Key Logic!

✨ Core Value

Tired of button debounce issues? Struggling with long and short press detection?Button_det — A struct that solves all button detection challenges!

🎯 Summary in One Sentence

c

KeyState myButton ={100};// Initialization, done!

With just this line of code, you have a fully functional button detector!

🚀 Four Core Features

1. ⏰ Intelligent Debounce

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if(myButton.HI_press)

{

    printf("Pressed! Not a bounce");

    myButton.HI_press =0;

}

2. ⏱️ Long and Short Press Recognition

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if(myButton.HI_T >3000){printf("Long press for 3 seconds!"); myButton.HI_T =0;}

3. 🔄 Edge Detection

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if(myButton.UP){printf("Button pressed momentarily"); myButton.UP =0;}

4. 📊 Real-time Timing

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if(myButton.HI >1000){printf("Pressed for 1 second");}

🛠️ Minimal Usage

Step 1: Create Object

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KeyState powerButton ={50};// 50ms debounce

Below are the objects included in the struct

typedef struct{uint Jitters; // Debounce time uint HI;      // High level time, initial value=0 when the system powers on, first rising edge is valid, =1 when invalid uint LO;      // Low level time, initial value=0 when the system powers on, first falling edge is valid, =1 when invalid char HI_press;// High level debounce pressed flag, must be manually cleared by the user char LO_press;// Low level debounce pressed flag, must be manually cleared by the user uint HI_T;    // Last high level time, must be manually cleared by the user uint LO_T;    // Last low level time, must be manually cleared by the user char UP;      // Rising edge flag, must be manually cleared by the user char DO;      // Falling edge flag, must be manually cleared by the user}KeyState;

Step 2: 1ms Interrupt Detection

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void Timer_ISR(){KeyDET(&powerButton, P20);}

Step 3: Main Loop Response

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if(powerButton.HI_press){do_something(); powerButton.HI_press =0;}

💡 Why Choose It?

Traditional Solutions	Button_det
❌ Repeated debounce code	✅ Automatic debounce
❌ Complex long and short press logic	✅ Built-in duration detection
❌ Redundant code for multiple buttons	✅ Object-oriented design
❌ Edge detection is troublesome	✅ Rising and falling edges are directly usable

🎮 Practical Application Scenarios

Smart Home 🏠

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if(button.HI_T >5000){enter_pairing_mode();// Long press for 5 seconds to enter pairing mode}

Industrial Control 🏭

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if(button.UP && last_press_time <200){double_click_action();// Double click detection}

Consumer Electronics 📱

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if(button.LO_press){wake_up_device();// Wake up on button release}

📝 Expert Reminder

⚠️ Remember to clear the flags in a timely manner! Just like washing dishes after a meal, clear the flags after use!

c

myButton.HI_press =0;// Clear after use, develop good habits

🎉 Get Started

Just three files:

1. <span>Button_det.h</span> – Header file

2. <span>Button_det.c</span> – Implementation file

3. Your main program

Say goodbye to reinventing the wheel for button detection!

💬 Reader Benefits

Discussion Topic: What is the most troublesome issue with button detection in your project? Feel free to leave comments for discussion!

📢 The code in this article is suitable for various MCUs such as 51, STM32, etc. To obtain the complete code, please reply “Button Detection” in the public account backend.