LED INTERFACING WITH 8051

LEARNING EMBEDDED C PROGRAMMING FROM SCRATCH

I just started with learning Embedded C programming so , I just decided to blog every single practice projects I code to upload it directly here to make sure i can easily memorized how i did it last time and to keep a track on my progress.

Let's Begin

1. 8051 Microcontroller
2. LED

1. first connects Anode of the LED's to the Port P2 pin of 8051 (You can change Output pin port of 8051 as per your desires to any other Port )
2. Connect Cathode Pin of LED's to the Ground
3. Connect the 5V power supply to the 8051 and ground it
4. Check all the connects properly as per the above connects
5. Now, dump the Hex file generated into 8051

#include<reg52.h>     

void Delay(void);      // Function prototype declaration

void main (void) //main

{

  while(1)        // infinite loop

  {

    P2 = 0x00;      // LED ON

    Delay(); //Function call

    P2 = 0xff;      // LED OFF

    Delay();  

  }

}

void Delay(void)

{

  int j;

  int i;

  for(i=0;i<10;i++)

  {

    for(j=0;j<10000;j++)

    {

    }

  }

}

8051 is microprocessor while programming 8051 we need to include reg.52.h library

Any port of 8051 can be defined by just typing P0,P1,P2,P3

declaring P2 =1 it actually means we are initializing all pins in PORT2 as HIGH

To initialize the port either as LOW or HIGH we just need to declare port as 0 or 1 . eg - P2=0 or P2= 1

To Define any single pin from PORT we just need to say P2^0 where 0 points to pin 0 in port 2

or similarly to define port 2 pin4 we can write as P2^4

Lets me show how we can just use single pin instead of all

PROGRAM TO DEFINE PORT 2 PIN 0

#include <reg52.h>

sbit LED1 = P2^0;  

void Delay(void);      

void main (void)

{

  while(1)        // infinite loop

  {

    LED1 = 0;      // LED ON

    Delay();

    LED1 = 1;      // LED OFF

    Delay();  

  }

}

void Delay(void)

{

  int j;

  int i;

  for(i=0;i<10;i++)

  {

    for(j=0;j<10000;j++)

    {

    }

  }

}