4. Write a code that S1(push button -P1.1) turns LED1 (Red LED- P1.0) ON and sta

Question

4. Write a code that S1(push button -P1.1) turns LED1 (Red LED- P1.0) ON and stays on when you push once and turns off and stays OFF when you push 3 times. This should repeat forever.

5. Write a code that S2(push button -P1.2) turns LED2 (Red LED- P9.7) ON and stays ON when you push once and turns OFF and stays OFF when you push 3 times. This should repeat five times.

6. Write a code that LED2 (Red LED- P9.7) ON when as long as you push S2(push button - P1.2) and LED1 (Red LED- P1.0) on as long as S2(push button -P1.2) not pushed.

Explanation / Answer

#include <stdio.h>
enum LED1{
   ON,
   OFF
}led;   //enum variable for LED ON/OFF
int pushcount;   //counter to count push number
int flag;       //a flag to check LED switch off (Q no 2)
int button;       //global variable for push button
               //use your own variable to get pushbutton value

//Function to turn LED ON/OFF
void ledOnOff(int pushbutton)
{
   if(led==OFF)
   {
       if(pushbutton==1 && flag!=1)   //flag is used to check if LED turned Off
       {
           led=ON;
           pushcount=0;
       }
   }
   else
   {
       if(pushbutton==1)
       {
           pushcount++;
           if(pushcount==3)
           {
               led=OFF;
               pushcount=0;
           }
       }
   }
}

//Function to switch LED OFF
void ledSwitch(int pushbutton)
{
   if(led==OFF)
   {
       if(pushbutton==1)
       {
           pushcount++;
           if(pushcount==5 && flag!=1)
           {
               led=ON;
               pushcount=0;
           }
       }
   }
   else
   {
       int i;
       for(i=0;i<1000;i++);
       led=OFF;
       flag=1;
   }
}
int main()
{
   led=OFF;   //initialize LED to OFF
   pushcount=0;   //initialize pushcount to 0
   flag=0;       //initialise flag to 0
   while(1)   //continuous loop
   {
       ledOnOff(button);
       ledSwitch(button);
   }
   return 0;
}

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