MCU independent button to prevent continuous pressing

I recently learned about single-chip microcomputers. When making buttons, I added anti-shake, but accidentally turned it into continuous pressing. If the anti-shake time is extended, it will affect the program execution. Finally, I added a button release detection to solve the problem of accidentally turning it into continuous pressing.

//----------------------Independent buttons-------------------------------------------------------------------

//4-bit independent button test, with anti-shake function and anti-long press function

//--------------------------------------------------------------------------------------------------

#include

#include "Keyboard.h"

void Key_Init()

{

TRISC=0xF0; //High 4 bits input, key detection, low 4 bits output, sound output

//Beep=0;

}

//---------------------------------------------------------------------------------------------------

//Key prompt tone

//n is the number of beeps. When l=0, it beeps about 50ms. When l>0, it beeps about 500ms.

//---------------------------------------------------------------------------------------------------

void Beep_Beep(INT8U n,INT8U l)

{

do

{

Beep=1;

if(l>0)

__delay_ms(500);

else

__delay_ms(50);

Beep=0;

if(l>0)

__delay_ms(500);

else

__delay_ms(50);

}while(1}

//---------------------------------------------------------------------------------------------------

//Detect the button to prevent long press. Long press will only display one press.

//---------------------------------------------------------------------------------------------------

char Key()

{

if(Key1==0) //If the key is pressed

{

__delay_ms(10); //delay 10ms

if(Key1==0) //Continue to check whether it is pressed. If it is, it means the button is pressed. If not, it means it is shaking.

{

while(!Key1); //Wait for the button to be released before returning to the button value to prevent continuous pressing due to untimely release

return 1;

}

}

if(Key2==0)

{

__delay_ms(10);

if(Key2==0)

{

while(!Key2);

return 2;

}

}

if(Key3==0)

{

__delay_ms(10);

if(Key3==0)

{

while(!Key3);

return 3;

}

}

if(Key4==0)

{

__delay_ms(10);

if(Key4==0)

{

while(!Key4);

return 4;

}

}

return 0;

}

head File 

//----------------------Independent buttons--------------------------------------------

//4-bit independent button test, with anti-shake function

//--------------------------------------------------------------------------

#define Beep RC3

#define Long_Beep 1

#define Short_Beep 0

#define Key1 RC4

#define Key2 RC5

#define Key3 RC6

#define Key4 RC7

#define _XTAL_FREQ 4000000UL

#define INT8U unsigned char

//----------------------------------------------------------------------------

//Function declaration

//----------------------------------------------------------------------------

void Beep_Beep(INT8U n,INT8U l);

void Key_Init();

char Key();