本文程式碼已上傳到GitHub：https://github.com/Waao666/STM32-2.-LED_Library_Function

main.c

#include <stm32f4xx.h>
#include <stm32f4xx_gpio.h>

int main(void)
{
	GPIO_InitTypeDef InitStruct;
	
	RCC->AHB1ENR |= (1<<7);
	
	InitStruct.GPIO_Pin = GPIO_Pin_9;
	InitStruct.GPIO_Mode = GPIO_Mode_OUT;
 

	InitStruct.GPIO_OType = GPIO_OType_PP;
	InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
	InitStruct.GPIO_Speed = GPIO_Speed_25MHz;
	
	GPIO_Init(GPIOH, &InitStruct);
	while(1);
}

void SystemInit(void)
{
}

stm32f4xx.h

#ifndef __STM32F4XX_H
#define __STM32F4XX_H

#define   __IO  volatile

typedef unsigned
 
 int    uint32_t;
typedef unsigned short  uint16_t;
typedef unsigned char   uint8_t;

//----------------------基地址賦值------------------------
#define PERIPH_BASE         ((unsigned int)0x40000000)
	
//匯流排暫存器
#define APB1PERIPH_BASE     PERIPH_BASE
#define APB2PERIPH_BASE     (PERIPH_BASE + 0x00010000)
#define AHB1PERIPH_BASE     (PERIPH_BASE + 0x00020000)
 

#define AHB2PERIPH_BASE     (PERIPH_BASE + 0x10000000)
#define AHB3PERIPH_BASE     (PERIPH_BASE + 0X60000000)


//GPIO 暫存器
#define GPIOA_BASE          AHB1PERIPH_BASE
#define GPIOB_BASE          (AHB1PERIPH_BASE + 0x00000400)
#define GPIOC_BASE          (AHB1PERIPH_BASE + 0x00000800)
#define GPIOD_BASE          (AHB1PERIPH_BASE + 0x00000C00)
#define GPIOE_BASE          (AHB1PERIPH_BASE + 0x00001000)
#define GPIOF_BASE          (AHB1PERIPH_BASE + 0x00001400)
#define GPIOG_BASE          (AHB1PERIPH_BASE + 0x00001800)
#define GPIOH_BASE          (AHB1PERIPH_BASE + 0x00001C00)
#define GPIOI_BASE          (AHB1PERIPH_BASE + 0x00002000)
//復位和時鐘控制
#define RCC_BASE            (AHB1PERIPH_BASE + 0x00003800)

//外設時鐘使能暫存器
#define RCC_AHB1ENR         *((unsigned int *)(RCC_BASE + 0X30))

typedef struct
{
	__IO uint32_t MODER;
	__IO uint32_t OTYPER;
	__IO uint32_t OSPEEDR;
	__IO uint32_t PUPDR;
	__IO uint32_t IDR;
	__IO uint32_t ODR;
	__IO uint16_t BSRRL;
	__IO uint16_t BSRRH;
	__IO uint32_t LCKR;
	__IO uint32_t AFR[2];
}GPIO_TypeDef;

typedef struct
{
	__IO uint32_t CR;
	__IO uint32_t PLLCFGR;
	__IO uint32_t CFGR;
	__IO uint32_t CIR;
	__IO uint32_t AHB1RSTR;
	__IO uint32_t AHB2RSTR;
	__IO uint32_t AHB3RSTR;
	__IO uint32_t RESERVED0; //此處為適用於其他晶片版本的APB1RSTR
	__IO uint32_t APB1RSTR;
	__IO uint32_t RESERVED1[2]; //此處為適用於其他晶片版本的APB2RSTR
	__IO uint32_t APB2RSTR;
	__IO uint32_t AHB1ENR;
	__IO uint32_t AHB2ENR;
	__IO uint32_t AHB3ENR;
	//後面還有很多，省略...
}RCC_TypeDef;

//------------------定義訪問外設的結構體指標---------------------
#define GPIOA   ((GPIO_TypeDef *) GPIOA_BASE)
#define GPIOB   ((GPIO_TypeDef *) GPIOB_BASE)
#define GPIOC   ((GPIO_TypeDef *) GPIOC_BASE)
#define GPIOD   ((GPIO_TypeDef *) GPIOD_BASE)
#define GPIOE   ((GPIO_TypeDef *) GPIOE_BASE)
#define GPIOF   ((GPIO_TypeDef *) GPIOF_BASE)
#define GPIOG   ((GPIO_TypeDef *) GPIOG_BASE)
#define GPIOH   ((GPIO_TypeDef *) GPIOH_BASE)
#define GPIOI   ((GPIO_TypeDef *) GPIOI_BASE)

#define RCC     ((RCC_TypeDef *) RCC_BASE)

#endif /* __STM32F4XX_H */

stm32f4xx_gpio.c

#include <stm32f4xx_gpio.h>
#include <stm32f4xx.h>

void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)                                //Set bits
{
	GPIOx->BSRRL = GPIO_Pin;
}

void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)                              //Reset bits
{
	GPIOx->BSRRH = GPIO_Pin;
}

void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)                   //Find the pin, and initialize the GPIO
{
	uint32_t pinpos = 0x00, pin = 0x00, currency = 0x00;
	currency = GPIO_InitStruct->GPIO_Pin;
	for(pinpos=0x00; pinpos<16; pinpos++)
	{		
			pin = 0x01<<pinpos;
			if(pin == (pin & currency))
			{
				GPIOx->MODER &= ~(3 << (2*pinpos));
				GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (2*pinpos));
			
				GPIOx->PUPDR &= ~(3 << ((2*pinpos)));
				GPIOx->PUPDR |= (((uint32_t)GPIO_InitStruct->GPIO_PuPd)) << (2*pinpos);
				
				if((GPIO_InitStruct->GPIO_Mode == GPIO_Mode_OUT) ||
					 (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_AF))
				{
					GPIOx->OSPEEDR &= ~(3 << (2*pinpos));
					GPIOx->OSPEEDR |= ((uint32_t)(GPIO_InitStruct->GPIO_Speed)<<(2*pinpos));
					
					GPIOx->OTYPER &= ~(1 << (pinpos));
					GPIOx->OTYPER |= (uint16_t)((GPIO_InitStruct->GPIO_OType)<<(pinpos));
				}
			}
	}
}

stm32f4xx_gpio.h

#include <stm32f4xx.h>

#define GPIO_Pin_0       ((uint16_t)0x0001)
#define GPIO_Pin_1       ((uint16_t)0x0002)
#define GPIO_Pin_2       ((uint16_t)0x0004)
#define GPIO_Pin_3       ((uint16_t)0x0008)
#define GPIO_Pin_4       ((uint16_t)0x0010)
#define GPIO_Pin_5       ((uint16_t)0x0020)
#define GPIO_Pin_6       ((uint16_t)0x0040)
#define GPIO_Pin_7       ((uint16_t)0x0080)
#define GPIO_Pin_8       ((uint16_t)0x0100)
#define GPIO_Pin_9       ((uint16_t)0x0200)
#define GPIO_Pin_10      ((uint16_t)0x0400)
#define GPIO_Pin_11      ((uint16_t)0x0800)
#define GPIO_Pin_12      ((uint16_t)0x1000)
#define GPIO_Pin_13      ((uint16_t)0x2000)
#define GPIO_Pin_14      ((uint16_t)0x4000)
#define GPIO_Pin_15      ((uint16_t)0x8000)
#define GPIO_Pin_ALL     ((uint16_t)0xffff)

//Initialize GPIO
/*
typedef struct
{
	uint32_t    GPIO_Pin;    
	uint8_t     GPIO_Mode;   
	uint8_t     GPIO_Speed;  
	uint8_t     GPIO_OType;  
	uint8_t     GPIO_PuPd;   
}GPIO_InitTypeDef;
*/

//-----------------------------------------------------------
//GPIO 
typedef enum
{
	GPIO_Mode_IN  = 0X00,   
	GPIO_Mode_OUT = 0X01,   
	GPIO_Mode_AF  = 0X02,   
	GPIO_Mode_AN  = 0X03    
}GPIOMode_TypeDef;


typedef enum
{
	GPIO_OType_PP   = 0x00,  
	GPIO_OType_OD   = 0x01   
}GPIOOType_TypeDef;


typedef enum
{
	GPIO_Speed_2MHz    = 0x00,  //2MHz
	GPIO_Speed_25MHz   = 0x01,  //25MHz
	GPIO_Speed_50MHz   = 0x10,  //50MHz
	GPIO_Speed_100MHz  = 0x11   //100MHz
}GPIOSpeed_TypeDef;


typedef enum
{
	GPIO_PuPd_NOPULL = 0X00,
	GPIO_PuPd_UP     = 0X01,
	GPIO_PuPd_DOWN   = 0X02 
}GPIOPuPd_TypeDef;
//-----------------------------------------------------------

typedef struct
{
	uint32_t           GPIO_Pin;     
	GPIOMode_TypeDef   GPIO_Mode;    
	GPIOOType_TypeDef  GPIO_OType;   
	GPIOSpeed_TypeDef  GPIO_Speed;   
	GPIOPuPd_TypeDef   GPIO_PuPd;   
}GPIO_InitTypeDef;


void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin);
void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin);
void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct);