LED light of single chip microcomputer learning notes

Use the development board ：

                Puzhong science and technology development board

Compiling software ：

                keil

Briefly review the LED （led）, The core of LED is made of P Type semiconducting body and N Type semiconductor Composed of wafer , stay P Type semiconductor and N There is a transition layer between type a semiconductors , be called PN junction . It has a single conductivity .

Positive and negative judgment ：

Usually ：

1、 Yes The gap One end of is negative ;

2、 The end with the horizontal bar is the negative pole ;

3、 One end with a white parallel bar is a negative pole ;

4、 One end in the direction of the triangular arrow is the negative pole ;

5、 One end of the small circle of plug-in diode silk screen printing is the negative pole , The big circle is the positive pole .

In vertical position welding In this case, the original body is in the positive ring

6、 The square hole of the plug-in LED is the first pin and the positive pole is the first pin .

Schematic diagram of development board ：

  Light a lamp , Set the corresponding discipline to low level

sbit Variable name = Address values ;

Code ：

#include "reg52.h"    // This file defines some special function registers of MCU 
#include<intrins.h>		// Because you're going to use the left-right shift function , So add this header file 

sbit led0 = P2^0;		  // The of single chip microcomputer P2.0 The port is defined as led0
sbit led1 = P2^1;
sbit led2 = P2^2;
sbit led3 = P2^3;
sbit led4 = P2^4;
sbit led5 = P2^5;
sbit led6 = P2^6;
sbit led7 = P2^7;	   

// Lighten up  8  individual 	led  The lamp 
void lighterLed()
{
	 while(1)
	{
		led0=0;	//P2.0 The port is set to low level 
		led1=0;	//P2.1 The port is set to low level 
		led2=0;	//P2.2 The port is set to low level 
		led3=0;	//P2.3 The port is set to low level 
		led4=0;	//P2.4 The port is set to low level 
		led5=0;	//P2.5 The port is set to low level 
		led6=0;	//P2.6 The port is set to low level 
		//led7=0;	//P2.7 The port is set to low level 		
	}
}


/*******************************************************************************
*  Letter   Count   name        : main
*  The functionality 		 :  The main function 
*  transport      Enter into        :  nothing 
*  transport      Out     	 :  nothing 
*******************************************************************************/
void main()
{
    lighterLed(); // Lighten up LED
	
	 	
}