GPTIM_Basic.c

#include "stm32f4xx.h"                  // Device header

int main(){
	//GPIO Config
	RCC->AHB1ENR |=0x8;
	GPIOD->MODER |= (1<<30);
	
	//TIM2 Config @16Mhz
	RCC->APB1ENR |= 0x1;	//Enable TIM2 Clock Bus
	TIM2->PSC = 1600-1;		//16.000.000 dive by 1.600	= 10.000 (Prescaler Register)
	TIM2->ARR = 10000-1;	//10.000 dive by 10.000 = 1Hz	(Auto Reload Register)
	TIM2->CNT = 0;				//Clear timer counter	(Counter Register)
	TIM2->CR1 = 1;				//Enable TIM2 (Control 1 Register)
	
	while(1){
		while(!(TIM2->SR & 0x1));	//Check Update Interrupt Flag (Status Register)
			TIM2->SR &= ~0x1;				//Clear Update Interrupt Flag	(Status Register)
			GPIOD->ODR ^= (1<<15);
	}
}