#include <stdio.h>
#include "pico/stdlib.h"
#define led 6
#define button 14
int store[3]={ 6,3,2 };  // No of times blinking can be set here
static int count,res,three;
static volatile int var=1;
struct repeating_timer timer; //timer variable
void button_callback(uint gpio,uint32_t events){  //interrupt for push button
  static int rand=0;
  if((rand++) >= 100){
    int hk=var;
    var=!var;  //toggle button state
  if(hk != var){
     rand=0; res=0; count=0;
     if(var == 1){
      three=0;
      printf("Interrupt occured %d Normal pattern \n",var);   //normal pattern
     }
     else if(var==0){
      three=2;
      printf("Interrupt occured %d Reverse pattern\n",var);  //reverse pattern
     }
  }
  }
}
bool repeating_timer_callback(struct repeating_timer *t) {   //timer function 
    printf("Time in sec= %d\n",res);
    count++,res++;
    if(count == store[three]) {                   //condition to change blinking time
      printf("Blink after every %d sec\n",store[three]);
      gpio_put(led,1);
      sleep_ms(200);
      gpio_put(led,0);
      add_repeating_timer_ms(900, repeating_timer_callback, NULL, &timer);
      count=0;
    }
      if((var == 1) && (three<3) && (res==60)){     //normal pattern
        three++;  res=0;  count=0;
        if(three >= 3) {
          three=0;
        }
      }
      else if((var==0) &&(three>0) && (res==60)) {  //reverse pattern
        three--;  res=0;  count=0;
        if(three <= 0){
          three=3;
        }
      }
}
int main() {
     stdio_init_all();
     printf("HELLO FROM PICO\n");
     gpio_init(led); gpio_init(button);  //in it
     gpio_set_dir(button,GPIO_IN); gpio_set_dir(led, GPIO_OUT);  //set direction
     gpio_pull_up(button); //pull up for button
     gpio_set_irq_enabled_with_callback(button,0x04,1,button_callback); //interrupt attached
     add_repeating_timer_ms(800, repeating_timer_callback, NULL, &timer); //timer attached
     while (1) {  /*do nothing */ }        
}
//--------------------------------------------------------------------------------------



/* NOTE: when interrupt 0 occurs : led blinks every 2 sec then 3 and then 6 sec.
         when interrupt 1 occurs : led blinks every 6 sec then 3 and then 2 sec.
         By default interupt 1 is enabled */