51 single chip microcomputer program - button control LED light-EEWORLD

#include

void Delay(unsigned int t);

sbit key=P3^2; //Corresponding to the s19 button on the MCU development board

void main (void)

{

while (1) //After the function starts, it keeps checking whether the button is pressed

{

if(key==0)

{

unsigned char i; //define an unsigned character type local variable i with a value range of 0~255

P0=0x7f; //Assign initial value, the first light on the right turns on

for(i=0;i<8;i++) //Add a for loop, indicating that the program in the for loop braces is executed 8 times

{

Delay(50000);

P0>>=1; //Move one position to the right.

P0=P0|0x80; //After right shift, the left end is automatically assigned 0, so this statement is required to assign 1

}

else

{

P0=0x00;

}

void Delay(unsigned int t)

{

while(--t);

}

Reference address：51 single chip microcomputer program - button control LED light

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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.

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