【STM32】stm32通过地址操作寄存器

0x01 stm32数据类型所占字节数

char = 1
short = 2
int = 4
long = 4
long long = 8
float = 4
double = 8
long double = 8
注意：1字节表示为16进制：0xFF

0x02 如何查看寄存器地址（基地址+偏移地址）

通过STM32中文参考手册查看相应寄存器，查看寄存器地址（基地址+偏移地址），然后分析寄存器每一位作用。

0x03 操作寄存器地址控制LED闪烁（代码）

#define RCC_APB2ENR (*(volatile unsigned int *)0x40021018)
#define GPIOA_CRL 	(*(volatile unsigned int *)0x40010800)
#define GPIOA_ODR 	(*(volatile unsigned int *)0x4001080C)

void Delay_ms(unsigned int t);

int main(void)
{
//	/*RCC基地址0x40021000 + RCC_APB2ENR偏移地址0x18*/
//	*(volatile unsigned int *)0x40021018 |= 1<<2;
//	
//	/*GPIOA基地址0x40010800 + GPIOA_CRL偏移地址0x00*/
//  *(volatile unsigned int *)0x40010800 &= 0xFFF0000F;
//  *(volatile unsigned int *)0x40010800 |= 0x00033330;	
	
	RCC_APB2ENR |= (1<<2);
 	GPIOA_CRL &= 0xFFF0000F;
	GPIOA_CRL |= 0x00033330;
	
	while(1)
	{
//		/*GPIOA基地址0x40010800 + GPIOA_ODR偏移地址0x80*/
//		*(volatile unsigned int *)0x4001080C |= (1<<1 | 1<<2 | 1<<3 | 1<<4);
//		Delay_ms(1000);
//		*(volatile unsigned int *)0x4001080C &= ~(1<<1 | 1<<2 | 1<<3 | 1<<4);
//		Delay_ms(1000);
		
		GPIOA_ODR |= (1<<1 | 1<<2 | 1<<3 | 1<<4);
		Delay_ms(1000);
		GPIOA_ODR &= ~(1<<1 | 1<<2 | 1<<3 | 1<<4);
		Delay_ms(1000);
	}
}

void Delay_ms(unsigned int t)
{
	unsigned int i;
	while(t--)
	{
		i=12000;
		while(i--);
	}
}

0x04 通过定义结构体指针操作寄存器（代码）

#include "main.h"

void Delay_ms(unsigned int t);

int main(void)
{
//	/*RCC基地址0x40021000 + RCC_APB2ENR偏移地址0x18*/
//	*(volatile unsigned int *)0x40021018 |= 1<<2;
//
//	/*GPIOA基地址0x40010800 + GPIOA_CRL偏移地址0x00*/
//  *(volatile unsigned int *)0x40010800 &= 0xFFF0000F;
//  *(volatile unsigned int *)0x40010800 |= 0x00033330;	
	
	RCC->APB2ENR |= 1<<2;
	GPIOA->CRL &= 0xFFF0000F;
	GPIOA->CRL |= 0x00033330;
	
	while(1)
	{
//		/*GPIOA基地址0x40010800 + GPIOA_ODR偏移地址0x80*/
//		*(volatile unsigned int *)0x4001080C |= (1<<1 | 1<<2 | 1<<3 | 1<<4);
//		Delay_ms(1000);
//		*(volatile unsigned int *)0x4001080C &= ~(1<<1 | 1<<2 | 1<<3 | 1<<4);
//		Delay_ms(1000);
		
		GPIOA->ODR |= (1<<1 | 1<<2 | 1<<3 | 1<<4);
		Delay_ms(1000);
		GPIOA->ODR &= ~(1<<1 | 1<<2 | 1<<3 | 1<<4);
		Delay_ms(1000);
	}
}

void Delay_ms(unsigned int t)
{
	unsigned int i;
	while(t--)
	{
		i=12000;
		while(i--);
	}
}

#ifndef __MAIN_H__
#define __MAIN_H__

typedef struct{
  unsigned int CR;
	unsigned int CFGR;
	unsigned int CIR;
	unsigned int APB2RSTR;
	unsigned int APB1RSTR;
	unsigned int AHBENR;
	unsigned int APB2ENR;
	unsigned int APB1ENR;
	unsigned int BDCR;
	unsigned int CSR;
	unsigned int AHBRSTR;
	unsigned int CFGR2; 
}RCC_Typedef;

typedef struct{
	unsigned int CRL;
	unsigned int CRH;
	unsigned int IDR;
	unsigned int ODR;
	unsigned int BSRR;
	unsigned int BRR;
	unsigned int LCKR;
}GPIOA_Typedef;

/*定义结构体指针，指向外设基地址*/
#define RCC ((RCC_Typedef *)0x40021000)
#define GPIOA ((GPIOA_Typedef *)0x40010800)

#endif