//#include "stm32c031xx.h"
void delays(){
  for(volatile long int i=0;i<200000;i++);
}
void setup() {
  // put your setup code here, to run once:
  GPIOA->MODER|=1;
  GPIOA->MODER&=~(1<<1);
  GPIOA->MODER&=~(1<<2);
  GPIOA->MODER&=~(1<<3);
  GPIOA->PUPDR|=1<<3;
  GPIOA->PUPDR&=~(1<<2);
  while(1){
    //GPIOA->ODR^=1; //OUT PUT REGISSTER
    if((GPIOA->IDR&(0B10))==0B10){
    GPIOA->   BSRR=0X1; //bit set and rest register
    //GPIOA->ODR=1;
    }
    else{
    GPIOA->BSRR=0X10000;
    //GPIOA->ODR=0;
    }
     
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  
}