STC51 MCU running light + external interrupt buzzer-EEWORLD

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I made a simple running light in my spare time. The design idea is to display the LED lights from 0 to 7 one by one, and then from 7 to 0 one by one. If an external interrupt occurs (i.e. a button is pressed), all 8 LED lights will light up, and then the running light state will be restored.

#include

#define uchar unsigned char

#define uint unsigned int

sbit K=P3^2; //Start button, external interrupt

uchar led;

void delay(uint x)

{

while(x--);

}

void XX()//interrupt setting

{

EA=1;

EX0=1;

}

void DD()

{

uint i=0; //define i=0 for the following call

led=0xfe; //1111 1110

delay(30000);

while(1)

{

for(i=0;i<7;i++)

{

led=_crol_(led,1); //1111 1101 (A,B), A is the value of left shift, B is the number of bits of left shift

P1=led;

delay(30000);

}

for(i=0;i<7;i++)

{

led = _cror_ (led, 1); // 0111 1111

P1=led;

delay(30000);

}

void main()

{

XX();

DD();

}

void XX1() interrupt 0

{

delay(1000); //anti-shake

if(K==0)

{

P1 = 0X00;

delay(30000);

}

Keywords：STC51 Reference address：STC51 MCU running light + external interrupt buzzer

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