stm32-初识

初识

STM32F103C8

点灯

/* === main.h ===*/
#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;

#define RCC ((RCC_Typedef *)0x40021000)
#define GPIOA ((GPIOA_Typedef *)0x40010800)

#endif

/* === main.c ===*/
/* === version 1 === */
#include "main.h"

#define RCCAPB2ENR 	(*((volatile unsigned long *)0x40021018))
#define GPIOACRL 		(*((volatile unsigned long *)0x40010800))
#define GPIOAODR		(*((volatile unsigned long *)0x4001080C))

void Delay(unsigned long count);

int main()
{
//	int count=10;

	// RCC_A 外设时钟寄存器
	// GPIOA外设时钟寄存器
	*((unsigned long *)0x40021018) |= (1<<2); //0x40021000+0x18 bit[2]
	//	RCCAPB2ENR |= (1<<2); //0x40021000+0x18 bit[2]

	// GPIOA_CRL  portA
	*((unsigned long *)0x40010800) &= 0xFFF0000F;

	// PA1~PA4 设置为通用推挽输出模式
 	*((unsigned long *)0x40010800) |= 0x00033330; 	// 4-19λ[19:4] 0011 0011 0011 0011
	//	GPIOACRL |= 0x00033330; // 4-19λ[19:4] 0011 0011 0011 0011

	// GPIOA_ODR 0x40010800+0x0C
	*((unsigned long *)0x4001080C) &= ~((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4 输出低电平，LED全灭
	//	GPIOAODR &= ~((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4 输出低电平

	// 点亮LED
	while(1)
	{
	//		*((unsigned long *)0x4001080C) |=  ((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4输出高电平,LED点亮
		GPIOAODR |=  ((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4输出高电平,LED点亮
		Delay(0xffffff); // 延时

	//		*((unsigned long *)0x4001080C) &= ~((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4 输出低电平，LED全灭
		GPIOAODR &= ~((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4 输出低电平，LED全灭
		Delay(0xffffff); // 延时
	}
}

void Delay(unsigned long  count)
{
	while(count--)
	{
	}
}

/* === version 2 === */
#include "main.h"

void Delay(unsigned long count);

int main()
{
	// 使用结构体指针
	// version1 
	// RCC_Typedef *RCC;
	// RCC = (RCC_Typedef *)0x40021018; // 结构体指针 指向 RCC的地址基地址
									 // 结构体中的每个成员都从基地址偏移四个字节，注意内存对齐
	// version2 在头文件中定义结构体
	// #define RCC (RCC_Typedef *)0x40021018

	// RCC_A 外设时钟寄存器
	// GPIOA外设时钟寄存器
	// *((unsigned long *)0x40021018) |= (1<<2); //0x40021000+0x18 bit[2]
	// RCCAPB2ENR |= (1<<2); //0x40021000+0x18 bit[2]
	RCC->APB2ENR |= (1 << 2); // 打开某一位，其他位保持不变

	// GPIOA_CRL  portA
	// *((unsigned long *)0x40010800) &= 0xFFF0000F;
	// GPIOACRL &= 0xFFF0000F;
	GPIOA->CRL  &= 0xFFF0000F;

	// PA1~PA4 设置为通用推挽输出模式
	// *((unsigned long *)0x40010800) |= 0x00033330; 	// 4-19 [19:4] 0011 0011 0011 0011
	// GPIOACRL |= 0x00033330; // 4-19 [19:4] 0011 0011 0011 0011
	GPIOA->CRL |= 0x00033330;

	// GPIOA_ODR 0x40010800+0x0C
	// *((unsigned long *)0x4001080C) &= ~((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4 输出低电平，LED全灭
	// GPIOAODR &= ~((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4)); // PA1~PA4 输出低电平
	GPIOA->ODR &= ~((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4)); // PA1~PA4 输出低电平

	// 点亮LED
	while (1)
	{
		// *((unsigned long *)0x4001080C) |=  ((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4输出高电平,LED点亮
		// GPIOAODR |= ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4)); // PA1~PA4输出高电平,LED点亮
		GPIOA->ODR |= ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4)); // PA1~PA4输出高电平,LED点亮
		Delay(0xffffff);										 // 延时

		// *((unsigned long *)0x4001080C) &= ~((1<<1) | (1<<2) | (1<<3) | (1<<4)); // PA1~PA4 输出低电平，LED全灭
		// GPIOAODR &= ~((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4)); // PA1~PA4 输出低电平，LED全灭
		GPIOA->ODR &= ~((1 << 1) | (1 << 2) | (1 << 3) | (1 << 4)); // PA1~PA4 输出低电平，LED全灭
		Delay(0xffffff);										  // 延时
	}
}

void Delay(unsigned long count)
{
	while (count--)
	{
	}
}