explain

Delay100ms(unsigned char turn) Is the delay function , Time delay ： turn * 0.1s
mypow(unsigned int a,unsigned int b)： Calculation a Of b Power

control LED Light up one by one , You need to continuously cycle through the following code
T = 1111 1111

P2 = 1111 1110 //T - 1
P2 =1111 1101 //T - 2
P2 = 1111 1011 //T - 4
P2 = 1111 0111 //T - 8
P2 = 1110 1111 //T - 16
P2 = 1101 1111 //T - 32
P2 = 1011 1111 //T - 64
P2 = 0111 1111 //T - 128

It's actually T subtract 2 ^ i

Code

#include <REGX52.H>
#include <INTRINS.H>

void Delay100ms(unsigned char turn)		//@11.0592MHz
{
    
	while(turn--){
    
		unsigned char i, j, k;

		_nop_();
		_nop_();
		i = 5;
		j = 52;
		k = 195;
		do
		{
    
			do
			{
    
				while (--k);
			} while (--j);
		} while (--i);
	}
}

int mypow(unsigned int a,unsigned int b){
    
	unsigned  int i=0;
	for(i;i<b;i++){
    
		a=a*a;
	}
	return a;
}

void main(){
    
	unsigned int T=0xff;
	unsigned int i=0;
	
	while(1){
    
		for(i;i<8;i++){
    
			P2=T-mypow(i,2);
			Delay100ms(2);					//500ms
		}
	}
}