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Turn On LED - STM32F4

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#include <stm32f4xx.h>
#define ALL_GPIO 0x1FF
#define LED 15
void main(void)
{
RCC->AHB1ENR = ALL_GPIO;
GPIOD->MODER |= (1 << (LED * 2));//OUTPUT
GPIOD->OSPEEDR |= (0x02 << (LED * 2));//50MHz
GPIOD->PUPDR &= (0x03 << (LED * 2)); //Set it for NO PUPD
GPIOD->BSRRL |= (1<<LED);
while(1)
{

}
}

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