LED灯代码：

#define PERIPH_BASE      ((unsigned int)0x40000000)
	
#define AHB1PERIPH_BASE  (PERIPH_BASE + 0x00020000)

#define GPIOF_BASE       (AHB1PERIPH_BASE + 0x1400)

#define GPIOF_MODER 	 *(unsigned int*)(GPIOF_BASE+0x00)
#define GPIOF_BSRR 		 *(unsigned int*)(GPIOF_BASE+0x18)
	

#define RCC_BASE 		(AHB1PERIPH_BASE + 0x3800)
#define RCC_AHB1ENR 	*(unsigned int*)(RCC_BASE+0x30)

main.c

#include "stm32f4xx.h"

typedef unsigned int u32;   //unsigned int -- u32

void SystemInit()
{
	
}


void delay(u32 i)
{
	while(i--);
}


int main()
{
	RCC_AHB1ENR |= 1<<5;
	//GPIOF_MODER = (1<<(2*9));
	GPIOF_MODER = (5<<(2*9));;
	while(1)
	{
		GPIOF_BSRR=(3<<(16+9));
		delay(0xFFFFF);
	
		GPIOF_BSRR=(3<<(9));
		delay(0xFFFFF);	
	}
}