#error “Please select first the target STM32F4xx device used in your application (in stm32f4xx.h-优快云博客

本文链接：https://blog.youkuaiyun.com/Code_Farmer_007/article/details/127622976

本文介绍了如何解决在使用STM32F4xx微控制器时遇到的错误，问题出在没有正确选择应用中的目标设备。解决方案是根据STM32的存储器映射在stm32f4xx.h文件中定义寄存器地址，通过修改该头文件内容来修复Bug。

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一、Bug背景

在使用寄存器方式点亮LED时遇到的Bug

在这里插入图片描述
解决方案：
根据STM32的存储器映射先定义好各个寄存器的地址，并把这些地址定义都写在stm32f4xx.h中。
stm32f4xx.h文件里的全部内容如下：


/*片上外设基地址  */
#define PERIPH_BASE           ((unsigned int)0x40000000)                          

/*总线基地址 */
#define AHB1PERIPH_BASE       (PERIPH_BASE + 0x00020000)	

/*GPIO外设基地址*/
#define GPIOA_BASE            (AHB1PERIPH_BASE + 0x0000)


/* GPIOA寄存器地址,强制转换成指针 */
#define GPIOA_MODER				*(unsigned int*)(GPIOA_BASE+0x00)
#define GPIOA_OTYPER			*(unsigned int*)(GPIOA_BASE+0x04)
#define GPIOA_OSPEEDR			*(unsigned int*)(GPIOA_BASE+0x08)
#define GPIOA_PUPDR				*(unsigned int*)(GPIOA_BASE+0x0C)
#define GPIOA_IDR					*(unsigned int*)(GPIOA_BASE+0x10)
#define GPIOA_ODR					*(unsigned int*)(GPIOA_BASE+0x14)
#define GPIOA_BSRR					*(unsigned int*)(GPIOA_BASE+0x18)
#define GPIOA_LCKR					*(unsigned int*)(GPIOA_BASE+0x1C)
#define GPIOA_AFRL					*(unsigned int*)(GPIOA_BASE+0x20)
#define GPIOA_AFRH					*(unsigned int*)(GPIOA_BASE+0x24)

/*RCC外设基地址*/
#define RCC_BASE              (AHB1PERIPH_BASE + 0x3800)

/*RCC的AHB1时钟使能寄存器地址,强制转换成指针*/
#define RCC_AHB1ENR				*(unsigned int*)(RCC_BASE+0x30)

以上代码是stm32f4xx.h文件的内容
定义好各个寄存器地址后，再次编译程序，Bug就解决了。

出现Bug时stm32f4xx.h文件的内容如下: (修改前)

/**
  ******************************************************************************
  * @file    stm32f4xx.h
  * @author  MCD Application Team
  * @brief   CMSIS STM32F4xx Device Peripheral Access Layer Header File.
  *            
  *          The file is the unique include file that the application programmer
  *          is using in the C source code, usually in main.c. This file contains:
  *           - Configuration section that allows to select:
  *              - The STM32F4xx device used in the target application
  *              - To use or not the peripheral抯 drivers in application code(i.e. 
  *                code will be based on direct access to