code about led_shake
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 //write by:cyt 2 //Project Name:Led on/off 3 //Time:2017-2-10 4 #include<reg51.h> 5 void delay(int c) 6 { 7 int a=38; 8 int b=130; 9 for(;c>0;c--) 10 { 11 for(;a>0;a--) 12 for(;b>0;b--) 13 ; 14 } 15 } 16 void main() 17 { 18 19 delay(1); 20 21 while(1) 22 { 23 unsigned char i=0; 24 delay(50); 25 P0 = 0x00; 26 delay(50); 27 P0 = 0xff; 28 } 29 } 30