Help with code (c language)

So this has been kind of stumping me the past couple days. Im doing a project in class where a subpart is going to be run off a push button that triggers 3 functions and then resets.

In class we use ATmega16 microcontrollers in CodevisionAVR IDE
ive also tried doing it on an arduino board at home with no success.

Code:

when a push button is pressed once
{
execute command
}

when the same push button is pressed a second time
{
execute another command
}

when the same push button is pressed a third time
{
execute a third command
}

when the same push button is pressed a fourth time
{
reset/off
}

here is what i have tried, it enters the first while loop but never exits (ignore the actual command codes inside the if statements as they were replaced with simple code just to check the push button would work, which it didnt)

Code:

#include <mega16.h>
#include <delay.h>


unsigned char i=5;

void main (void)
{

DDRD = 0xFF;  // port d output
DDRA = 0x00;  // port a input


while(1)
{

if((PINA & 0x80)!= 0)             //if pb is pressed once
{                                 //falls into while loop
i=1;
delay_ms(5);                      //to prevent multiple presses
}


while(i==1)
{
if(i==1)
{
OCR1A=55;                      //low setting PWM to portd for tac light
}
else if((PINA & 0x80)!= 0)         //if pb pressed twice
{                                 //falls into second while loop
i=2;
delay_ms(5);
}
}


while(i==2)
{
if(i==2)
{
OCR1A=255;                         //high PWM setting
}
else if((PINA & 0x80)!=0)
{
i=3;
delay_ms(5);
}
}



while(i==3)
{
if(i==3)
{
PORTD=PORTD|0x20;
delay_ms(2);                         //strobe
PORTD=PORTD & 0xDF;
delay_ms(2);                        
}
else if((PINA & 0x80)!=0)
{
i=4;
delay_ms(5);
}
}
}
}

Ive been stumped on this, ive tried a series of nested if/else statements and while loops. I know i can do this with a for loop but im not positive how to implement the push button into a for loop.

any advice?

thanks

 

Im not familiar with the 'goto' command at all. I was always told not to use it and was never taught what it does.


I also probably should have put in the original post the arduino code as i wont be back in that class until tuesday to try it there....


here is what i have in arduino. i cannot for the life of me get it to respond to the push, then release of a push button. it responds on the push no problem. I am using a debouncing IC.

Code:

const int led = 10;     //led pin 10
int pb = 7;                 //push button pin 7
int i;


void setup()
{
  pinMode(led,OUTPUT);
  pinMode(pb,INPUT);
}

void loop()
{
  
  pb=digitalRead(7);                       //pb = pushbutton state high or low
  i=1;                                            // counting variable
  
  if(pb==HIGH)                                //if pb is pressed
  {
   while(i<=4)                                  
   {
    delay(500); 
    digitalWrite(led,HIGH);
    delay(500);
    digitalWrite(led,LOW);
   
    if(pb==HIGH)
    {
    i++;
    }
   }
  }
}

in this current state i press the button and it goes into the while loop, but it completely ignores the nested "if" statement and increments the i variable regardless of the state of the push button and will stay in the while loop "x" number of times i have the while(i<=x) set for.

 

thank you for your feedback.

i didnt take it literal for drop in code. i converted your post into C/C++/whatever arduino uses syntactically and i didnt/dont know what goto does or another way to end a while loop. I thought that by making the while comparison false that would end it (that was my way around the goto statement) but for some reason the my nested if statement is being ignored and my variable to end the while statement is incrementing with the while loop instead of with the push button via the "if" statement.

 

got it working...

ironically the fool proof code i put in there with a delay was really messing with the button read for starters. So i went to PWM which was the original intent.

Secondly i wasnt reading the input again once it entered the first while loop. I looked up the goto function and tried it out since the comparison test was finicky...

Now it almost works perfect, but im pretty sure something is up with my switch debounce IC as i still seem to get double clicks on my tact switch but ill wait to mess with anything until i can put it on an o-scope at school tuesday and see if its software or hardware related.

edit: (definitely something wrong with my debounce IC because when i make the delay after the button press 300 it works perfect).


thanks for the help

Code:

int PWMpin = 10;
int i;

void setup()
{ 
  pinMode(7,INPUT);
}

void loop()
{

i=0;
bailout:      //goto return


//delay(150);

if(digitalRead(7)==HIGH)            //button pressed once
  {
    delay(100);
  i=1;                      //i==1
  while(i==1)
  { 
   if(digitalRead(7)==LOW)
    {
    analogWrite(PWMpin , 100);

    }
    else if(digitalRead(7)==HIGH)    //putton press 2
    {
      delay(100);
      i=2;                           //i=2
      while(i==2)
      {
        if(digitalRead(7)==LOW)
        {
            analogWrite(PWMpin, 250);
        }
         else if(digitalRead(7)==HIGH)  //button press 3rd time
        {
          digitalWrite(PWMpin, LOW);
          delay(100);
          i=0;     
          goto bailout;
        }
      }
    }
    }
  }
}