Single-chip Microcomputer example learning

1. Light the first LED light

#include <reg52.h>
sbit led = p2^0;


void Main ()
{
	while (1)
	{
		led = 0;
	}
}

2.LED Blinking

#include <reg52.h>
typedef unsigned char U8;
typedef unsigned int u16;

Sbit led = p2^0; D1

void Delay (U16 i)
{
	while (i--);
}

void Main ()
{
	while (1)
	{
     led = 0;
     Delay (50000);
     LED = 1;
		 Delay (50000);
	}
}

3.LED Running Lights

#include <reg52.h>
#include "intrins.h"

typedef unsigned char U8;
typedef unsigned int u16;

#define LED P2

void delay (U16 i)
{
	while (i--);
}

void Main ()
{
	U8 i= 0;
	LED = 0xFE;
	Delay (50000);
	
	while (1)
	{
		U8 i = 0;
		LED =0xfe;
		Delay (50000);
		for (i = 0; i<7; i++)
		{
		   led = _crol_ (led,1);
			 Delay (50000);
		}
		
		for (i = 0;i<7;i++)
		{
			led = _cror_ (led,1);
			Delay (50000);}}}

Relays

#include <reg51.h>	
sbit RELAY = p1^4;
Sbit K1    = p2^7;
Main ()
{
if (! K1) RELAY = 0;
else 	RELAY = 1;
}

4. Buzzer

#include <reg52.h>
#include "intrins.h"

typedef unsigned char U8;
typedef unsigned int u16;

Sbit beep = p1^5;

void Delay (U16 i)
{
	while (i--);
}

void Main ()
{
	while (1)
	{
		 beep = ~beep;
		 Delay (ten);
	}
}

5. Timers

#include "reg52.h"
typedef unsigned int u16;	  
typedef unsigned char U8;
Sbit led=p2^0;
void Timer0init ()
{
tmod|=0x01;
th0=0xfc;//timing 1ms
tl0=0x18;	
Et0=1;
ea=1;
tr0=1;
}

void Main ()
{	
	timer0init ();  
	while (1);		
}

void Timer0 () Interrupt 1
{
	static u16 I;
	TH0=0XFC;	
	tl0=0x18;
	i++;
	if (i==1000)
	{
		i=0;
		led=~led;	
	}	
}

6. Press the button

#include "reg52.h"			

typedef unsigned int u16;	 
typedef unsigned char U8;

Sbit k1=p3^1;	 
Sbit led=p2^0;	

void Delay (U16 i)
{
	while (i--);	
}

void Keypros ()
{
	if (k1==0)		  
	{	
		delay ();   
		if (k1==0)	 
		{
			led=~led;	  
		}
		while (!K1);	 
	}		
}

void Main ()
{	
	while (1)
	{	
		Keypros ()  	
	}		
}

7. External interrupts

Interrupt 1

#include "reg52.h"			

typedef unsigned int u16;	  
typedef unsigned char U8;

Sbit k3=p3^2;  
Sbit led=p2^0;	 

void Delay (U16 i)
{
	while (i--);	
}

void Int0init ()
{
	it0=1;
	Ex0=1;
	ea=1;
}

void Main ()
{	
	int0init ();  
	while (1);		
}



void Int0 ()	interrupt 0		
{
	delay (+);	
	if (k3==0)
	{
		led=~led;
	}
}

Interrupt 2

#include "reg52.h"			 

typedef unsigned int u16;	
typedef unsigned char U8;

Sbit k3=p3^3;  
Sbit led=p2^1;	 

void Delay (U16 i)
{
	while (i--);	
}

void Int1init ()
{
	it1=1;
	ex1=1;
	ea=1;	
}


void Main ()
{	
	int1init ();  
	while (1);		
}



void Int1 ()	interrupt 2		
{
	delay (+);	
	if (k3==0)
	{
		led=~led;
	}
}

8, Digital tube display