3)Binary-counter-leds

/*
*Binary counter
*/

#include <stm32f30x.h>

void sleepFor(int);

int main(void)
{
  RCC->AHBENR |= 0x00200000; 
  //We are interested in pins 8-15 , which are bits 16-31
  GPIOE->MODER |= 0x55550000;
  //Supposedly initial value of the leds are 0x00000000 , we want the final value to be 0x0000FF00; 
  int i;
  for(i = 0; i < 256; i++){
    GPIOE->ODR += 0x00000100;
    sleepFor(500000);
  }
  return 0;
}

void sleepFor(int busyTime){
int i;
for(i = 0; i < busyTime; i++){}
}