【蓝桥杯（51） STC15F2K60S2】之 “继电器与蜂鸣器实验

相关代码： ///跑马灯升级版！ #include “STC15F2K60S2.h”

//sbit H138_A=P2^5; //sbit H138_B=P2^6; //sbit H138_C=P2^7;

void Delay(unsigned int t)//不能用unsigned char 范围不够 { while(t–); while(t–); }

void InitH138(unsigned char n) { switch(n) { case 4://让Y输出低电平。 P2 = (P2 & 0x1f) | 0x80.//不打括号行吗？ break; case 5://让Y输出低电平。 P2 =(P2 & 0x1f )| 0xa0; break; case 6://让Y输出低电平。 P2 =(P2 & 0x1f )| 0xc0; break; case 7://让Y7输出低电平。 P2 =(P2 & 0x1f)| 0xe0; break; }

}

void OutputP0(unsigned char channel,unsigned char dat) { InitH138(channel); P0=dat; }

void LEDrunning() { unsigned char i;

for(i=0;i<3;i  ) {  OutputP0(4,0x00);  Delay(120000);  OutputP0(4,0xff);  Delay(120000); }  for(i=0;i<3;i  ) {  OutputP0(4 , 0xff<<i);  Delay(120000); }   OutputP0(5 , 0x10); Delay(120000); OutputP0(5 , 0x00);  for(i=0;i<3;i  ) {  OutputP0(4 , ~(0xff<<i));  Delay(120000); }  OutputP0(5 , 0x40); Delay(120000); OutputP0(5 , 0x00); 

}

void Initsystems() { OutputP0(5 , 0x00); }

void main() { while(1) { LEDrunning(); } }