/*
 * main.c
 *
 *  Created on: Apr 25, 2015
 *      Author: mari
 */
#include <stm32f4xx.h>
//include <arm_math.h>
#include <system_stm32f4xx.h>

#define OUTPUT(pin)  (0b01 << (pin * 2))


int main() {

	RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
	__DSB();
	GPIOD->MODER = OUTPUT(12);
	SysTick_Config(8*1680000);
	while(1);

}

void SysTick_Handler()
{
	GPIOD->ODR ^= (1<<12);
}