1 //led.h 2 #ifndef _LED_H_ 3 #define _LED_H_ 4  5 #define LED1_ON (GPIOF->ODR &= ~(1<<6)) 6 #define LED2_ON (GPIOF->ODR &= ~(1<<9)) 7 #define LED3_ON (GPIOF->ODR &= ~(1<<10)) 8 #define LED4_ON (GPIOC->ODR &= ~(1<<0)) 9 10 #define LED1_OFF (GPIOF->ODR |= (1<<6))11 #define LED2_OFF (GPIOF->ODR |= (1<<9))12 #define LED3_OFF (GPIOF->ODR |= (1<<10))13 #define LED4_OFF (GPIOC->ODR |= (1<<0))14 15 void led_init(int n);16 void delay(int n);17 18 #endif

 1 //led.c 2 #include "stm32f4xx.h" 3 #include "led.h" 4  5 void delay(int n) 6 { 7     while(n--); 8 } 9 10 void led_init(int n)11 {12     //管脚的外设时钟配置13     RCC->AHB1ENR |=(1<<2);  //GPIOC外设时钟使能14     RCC->AHB1ENR |=(1<<5);  //GPIOF外设时钟使能15     16     //管脚输出状态配置17     if(!n)18     {19         //模式配置20         GPIOC->MODER &= ~(0X3<<(2 * n));  //清零21         GPIOC->MODER |= (0X1<<(2 * n));   //通用输出模式22         //输出类型配置23         GPIOC->OTYPER &= ~(1<<n);   //推挽输出24         //输出速率配置25         GPIOC->OSPEEDR &= ~(0X3<<(2 * n)); //清零26         GPIOC->OSPEEDR |= (0X2<<(2 * n));  //输出速率50M27     }28     else29     {30         //模式配置31         GPIOF->MODER &= ~(0X3<<(2 * n));  //清零32         GPIOF->MODER |= (0X1<<(2 * n));   //通用输出模式33         //输出类型配置34         GPIOF->OTYPER &= ~(1<<n);   //推挽输出35         //输出速率配置36         GPIOF->OSPEEDR &= ~(0X3<<(2 * n)); //清零37         GPIOF->OSPEEDR |= (0X2<<(2 * n));  //输出速率50M38     }39 }

//main.c#include "stm32f4xx.h"#include "led.h"int main(){    //PF6 PF9 PF10 PC0 状态初始化    led_init(6);    led_init(9);    led_init(10);    led_init(0);        while(1)    {        LED1_ON;        delay(1000000);        LED1_OFF;        delay(1000000);                LED2_ON;        delay(1000000);        LED2_OFF;        delay(1000000);                LED3_ON;        delay(1000000);        LED3_OFF;        delay(1000000);                LED4_ON;        delay(1000000);        LED4_OFF;        delay(1000000);    }}