This post is focused to make people understand the concepts in Embedded systems and 8051 microcontroller family.In this AT89C52 microcontroller was used to light up the LED's using increment and loop concept.As you can see in the circuit diagram series of LED's was connected to the port 2 and port 3 of the Microcontroller and rest of the ports was left free as there is no need for it.Not only LED's you can use any component working with 5V and here it was given as LED for easier understanding.The crystal used here was 6MHz and the resistors used value was 470 ohm.There is no need of reset pin so it was connected to the +5V power supply.The coding was written by means of C language and we have used Archimedes Software IDE 8051 for this coding.
PROGRAM:
- #include<stdio.h>
- #include<reg51.h>
- unsigned char i;
- int j;
- void delay(void);
- void main()
- {
- i=0x00;
- while(++i);
- {
- P3=i;
- delay();
- P2=~i;
- }
- while(0);
- }
- void delay()
- {
- for(j=0;j<=15000;j++);
- }
EXPLANATION:
This program was very simple and pretty useful for the beginners and gives you better understanding in increment and loop concepts.The first two lines was the inclusion of registry files and the 3,4 was assigning variables.We should use delay since to view output there should be some delay since speed of the Microcontroller was very high.There was one main program and one sub routine for delay.The i value was given as 0x00 which indicates that it was 16bit hexadecimal number.The value of 00 equals 0000 0000 that is the the combination of two 4 bit numbers given to the respective ports.In line 11 you can see that the value of i was given to the port 3 and delay was called.The inverse i values was given to the port 2 and the program was inside the While(0); loop for the continuous running of the program.Then comes the sub routine program for the delay generation since we are using 6MHz crystal the delay will be very less but noticeable.
Hope this post will be useful for the beginners and more posts with increased complexity yet to come in this blog.Dont forget to comeback and share your opinions with us.
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