LED

#include <stdint.h>
#include <stdio.h>

#define GPIOD_MODER *((volatile uint32_t*)0x40020C00)
#define GPIOD_ODR *((volatile uint32_t*)0x40020C14)
#define RCC_ENR *((volatile uint32_t*)0x40023830)


int main(void)
{
	RCC_ENR|=(1<<3);//GPIOD CLOCK ENABLED

    GPIOD_MODER|=(1<<24);//setting pin 12 as output
    GPIOD_MODER|=(1<<26);//setting pin 13 as output
    GPIOD_MODER|=(1<<28);//14
    GPIOD_MODER|=(1<<30);//15


	GPIOD_ODR|=(1<<12); //setting output value to 1 (pin 12)
	GPIOD_ODR|=(1<<13);
	GPIOD_ODR|=(1<<14);
	GPIOD_ODR|=(1<<15);
}