Question

17. Write a C program to toggle bits PB1 and PB7. - 18. Write a C program to toggle only bit PBO. 19. Write a C program to count up PORTB from 0-99 continuously.

Answer 1

Please upvote ,comment if any query . Thanks .

Note : code compiled and tested in programmer's notepad AVR.

Question 17 : toggle PB1 and PB7

/*

if we connect LED on PB1 and PB7 it will turn on and off led at every second.

*/

#include<avr/io.h>
#include<util/delay.h>
#include<avr/interrupt.h>


int main(void)
{
  
DDRB|=(1<<DDB1)|(1<<DDB7); //set output pin PB1 and PB7
PORTB^=((1<<PB1)|(1<<PB7)); //toggle pin PB1 and PB7
  
   while(1)
   {
       //in while loop it will toggle PB1 and PB7 pin every second
      
       PORTB^=((1<<PB1)|(1<<PB7));
       _delay_ms(1000);
   }

}

Question 18 : toggle only PB0

//it will turn on and off PB0 pin connected LED at every second

#include<avr/io.h>
#include<util/delay.h>
#include<avr/interrupt.h>


int main(void)
{
  
DDRB|= (1<<DDB0); //set output pin PB0
PORTB^=(1<<PB0); //toggle the pin PB0
  
  
   while(1)
   {
       //in while loop it will toggle PB0 pin every second
      
       PORTB^=(1<<PB0);
       _delay_ms(1000);
   }

}

Question 19 : set counter value from 0-99 on PORTB

#include<avr/io.h>
#include<util/delay.h>
#include<avr/interrupt.h>


int main(void)
{
  
int i;

DDRB= 0xff; //set output complete PORTB

PORTB=0x00; //set low on PORTB
  
  
   for(i=0;i<=99;i++)
   {
       PORTB=i; //assign value to PORTB every 200ms
      
       _delay_ms(200);
      
   }

}

Program 17 :

#include<avr/io.h> #include<util/delay.h> #include<avr/interrupt.h> int main(void) { DDRB |=(1<<DDB1) |(1<<DDB7); //set output pin PB1 and PB7 PORTBA=((1<<PB1)|(1<<PB7)); //toggle pin PB1 and PB7 while(1) //in while loop it will toggle PB1 and PB7 pin every second PORTBA=((1<<PB1) |(1<<PB7)); _delay_ms(1000);

Program 18 :

#include<avr/io.h> #include<util/delay.h> #include<avr/interrupt.h> int main(void) DDRB = (1<<DDBO); PORTBA=(1<<PB0); //set output pin PBO //toggle the pin PBO while(1) //in while loop it will toggle PBO pin every second PORTBA=(1<<PBO); _delay_ms(1000);

Program 19 :

#include<avr/io.h> #include<util/delay.h> #include<avr/interrupt.h> int main(void) { int i; DDRB= Oxff; PORTB=0x00; //set output complete PORTB //set low on PORTB for(i=0;i<=99; i++) { PORTB=i; //assign value to PORTB every 200ms _delay_ms (200);