一个简单的STM32程序的设计与实现（点亮LED）

---

一、开发环境配置

1.keil5软件安装

    （1）在微信公众号或者优快云博客上下载安装包，和注册机软件。
    （2）打开安装包，→next

(4)更改路径，→next

(5)→NEXT

(6)安装中

（7）安装完成后关闭，使用管理员身份打开，点击许可与管理，英文License Management

(8) 将CID填入，Generate生成


（9）注册信息填入

（10）安装完成

2.Keil5 新建工程

（1）新建工程项目

（2）选择路径，取工程名

（3）选择型号

（4）勾选对应选项

（5）新建main.c文件（CTRL+N）

二、程序代码编写

1.使用寄存器方式点亮LED灯

//用来存放STM寄存器映射
#define PERIPH_BASE           ((unsigned int)0x40000000)//AHB
#define APB2PERIPH_BASE       (PERIPH_BASE + 0x10000)
#define GPIOA_BASE            (APB2PERIPH_BASE + 0x0800)
//GPIOA_BASE=0x40000000+0x10000+0x0800=0x40010800,????GPIOA????
#define GPIOB_BASE            (APB2PERIPH_BASE + 0x0C00)
//GPIOB_BASE=0x40000000+0x10000+0x0C00=0x40010C00,????GPIOB????
#define GPIOC_BASE            (APB2PERIPH_BASE + 0x1000)
//GPIOC_BASE=0x40000000+0x10000+0x1000=0x40011000,????GPIOC????
#define GPIOD_BASE            (APB2PERIPH_BASE + 0x1400)
//GPIOD_BASE=0x40000000+0x10000+0x1400=0x40011400,????GPIOD????
#define GPIOE_BASE            (APB2PERIPH_BASE + 0x1800)
//GPIOE_BASE=0x40000000+0x10000+0x0800=0x40011800,????GPIOE????
#define GPIOF_BASE            (APB2PERIPH_BASE + 0x1C00)
//GPIOF_BASE=0x40000000+0x10000+0x0800=0x40011C00,????GPIOF????
#define GPIOG_BASE            (APB2PERIPH_BASE + 0x2000)
//GPIOG_BASE=0x40000000+0x10000+0x0800=0x40012000,????GPIOG????
#define GPIOA_ODR_Addr    (GPIOA_BASE+12) //0x4001080C
#define GPIOB_ODR_Addr    (GPIOB_BASE+12) //0x40010C0C
#define GPIOC_ODR_Addr    (GPIOC_BASE+12) //0x4001100C
#define GPIOD_ODR_Addr    (GPIOD_BASE+12) //0x4001140C
#define GPIOE_ODR_Addr    (GPIOE_BASE+12) //0x4001180C
#define GPIOF_ODR_Addr    (GPIOF_BASE+12) //0x40011A0C   
#define GPIOG_ODR_Addr    (GPIOG_BASE+12) //0x40011E0C 
 
#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2))
#define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr))
 
 #define LED0  MEM_ADDR(BITBAND(GPIOC_ODR_Addr,13))
//#define LED0 *((volatile unsigned long *)(0x422101a0)) //PA8
/?typedef????
typedef  struct
{
   volatile  unsigned  int  CR;
   volatile  unsigned  int  CFGR;
   volatile  unsigned  int  CIR;
   volatile  unsigned  int  APB2RSTR;
   volatile  unsigned  int  APB1RSTR;
   volatile  unsigned  int  AHBENR;
   volatile  unsigned  int  APB2ENR;
   volatile  unsigned  int  APB1ENR;
   volatile  unsigned  int  BDCR;
   volatile  unsigned  int  CSR;
} RCC_TypeDef;
 
#define RCC ((RCC_TypeDef *)0x40021000)
/?typedef????
typedef  struct
{
volatile  unsigned  int  CRL;
volatile  unsigned  int  CRH;
volatile  unsigned  int  IDR;
volatile  unsigned  int  ODR;
volatile  unsigned  int  BSRR;
volatile  unsigned  int  BRR;
volatile  unsigned  int  LCKR;
} GPIO_TypeDef;
//GPIOA????GPIOA_BASE,GPIOA_BASE??????????GPIO_TypeDef
#define GPIOC ((GPIO_TypeDef *)GPIOC_BASE)
 
void  LEDInit( void )
{
	RCC->APB2ENR|=1<<4;    //使能PORTA时钟	   	 
		 
	GPIOC->CRH&=0XFFFFFFF0; 
	GPIOC->CRH|=0X00000003;//PA8 推挽输出   	 
    GPIOC->ODR|=1<<13;      //PA8 输出高	
}
 
/???
void  Delay_ms( volatile  unsigned  int  t)
{
     unsigned  int  i,n;
     for (n=0;n<t;n++)
         for (i=0;i<800;i++);
}

int main(void)
{
	 LEDInit();
     while (1)
     {
         LED0=0;//LED亮
         Delay_ms(500);//延时
         LED0=1;//LED灭
         Delay_ms(500);//延时
     }
}

2.使用库函数方式点亮LED灯

#include "sys.h"
#include "delay.h"
#include "usart.h"

#define LED_Pin GPIO_PIN_13
#define LED_GPIO_Port GPIOC

void Delay(__IO uint32_t nCount);

void Delay(__IO uint32_t nCount)
{
  while(nCount--){}
}

int main(void)
{
	GPIO_InitTypeDef GPIO_Initure;
     
    HAL_Init();                    	 			//初始化HAL库    
    Stm32_Clock_Init(RCC_PLL_MUL9);   			//设置时钟,72M

    __HAL_RCC_GPIOC_CLK_ENABLE();           	//开启GPIOA时钟
	
    GPIO_Initure.Pin=LED_Pin; 				//PA8
    GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;  	//推挽输出
    GPIO_Initure.Pull=GPIO_PULLUP;          	//上拉
    GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;    //高速
    HAL_GPIO_Init(LED_GPIO_Port,&GPIO_Initure);

	
	while(1)
	{
		HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13,GPIO_PIN_SET);		//PC13置1  			
		Delay(0x7FFFFF);
		HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13,GPIO_PIN_RESET);		//PC13置0 
		Delay(0x7FFFFF);
	}
}

三、编译烧录

四、上板效果