背景介绍

笔者在开发的时候，习惯应用自己的一套函数扩展库与工程模板，因此每次开始新的项目开发时，就会将上一个项目工程直接复制一份，在其基础上进行开发。当新项目与原项目的单片机型号不一样的时候，就涉及到如何将工程中的单片机型号的修改过来的问题。

本文将以工程中MCU型号从STM32F103C8Tx改为STM32F103VCTx为例，说明一下具体的操作步骤。

操作步骤

修改工程文件.cproject

用文本编辑器（NotePad++）打开.cproject工程文件，采用查找替换的方式，将工程文件中的原单片机型号“STM32F103C8”替换成“STM32F103VC”并保存。.project工程文件中没有需要修改的内容。

删除部分工程文件

删除XXX.elf.launch文件与XXX.map文件，这两个文件默认在工程目录文件夹中，在设置Run/Debug Configurations的时候会自动重新生成。

替换启动文件

将原来型号的启动文件（XXX.s文件）替换为startup_stm32f103vctx.s，这个启动文件可以通过在STM32CubeIDE中新建一个MCU型号为STM32F103VCTx的工程并自动生成代码而获得。也可以在源码中同时保留这些文件，而在Makefile中指定调用的文件名。

替换LinkerScript文件

将原来型号的链接文件（XXX.ld文件）替换为STM32F103VCTX_FLASH.ld，这个链接文件可以通过在STM32CubeIDE中新建一个MCU型号为STM32F103VCTx的工程并自动生成代码而获得。也可以在源码中同时保留这些文件，而在Makefile中指定调用的文件名。

当然也可以直接修改原来的链接文件：

/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM);	/* end of "RAM" Ram type memory */

_Min_Heap_Size = 0x200 ;	/* required amount of heap  */
_Min_Stack_Size = 0x400 ;	/* required amount of stack */

/* Memories definition */
MEMORY
{
    
  RAM    (xrw)    : ORIGIN = 0x20000000,   LENGTH = 48K
  FLASH    (rx)    : ORIGIN = 0x8000000,   LENGTH = 256K
}

主要修改的地方就在堆栈空间分配与RAM, Flash空间的定义。

修改Makefile文件

主要修改涉及到单片机型号、启动文件、链接文件等的内容：

LINK_SCRIPT = "STM32F103VCTX_FLASH.ld"

ASSEMBLER_FLAGS =-c -g -O0 -mcpu=cortex-m3  -mthumb  \
	-D"STM32F10X_HD" -D"USE_STDPERIPH_DRIVER"  -x assembler-with-cpp $(INCLUDE_DIR)
	
COMPILER_FLAGS =-c -g -MMD -mcpu=cortex-m3  -O0 -Wall \
	-ffunction-sections -fdata-sections -mthumb  \
	-D"STM32F10X_HD" -D"USE_STDPERIPH_DRIVER" $(INCLUDE_DIR) 

启动文件由于属于汇编文件，因此只要替换即可：

SRCSASM := 	$(wildcard */*/*/*/*/*/*/*/*.s) \
	$(wildcard */*/*/*/*/*/*/*.s) \
	$(wildcard */*/*/*/*/*/*.s) \
	$(wildcard */*/*/*/*/*.s) \
	$(wildcard */*/*/*/*.s) \
	$(wildcard */*/*/*.s) \
	$(wildcard */*/*.s) \
	$(wildcard */*.s)

当然，如果存在多个启动文件，可以排除不匹配的型号对应的文件：

#SRCSASM := $(filter-out Source/StdPeriLib/Startup/startup_stm32f103vctx.s, $(SRCSASM))
SRCSASM := $(filter-out Source/StdPeriLib/Startup/startup_stm32f10x_md.s, $(SRCSASM))

Alwhales库的修改

需要修改eeprom.h中关于flash划分作为eeprom的地址范围。

对于C8T6型号，flash的结束地址为“0x08010000”;
对于VCT6型号，flash的结束地址为“0x08040000”;

#if defined (STM32F10X_LD) || defined (STM32F10X_MD)
  #define PAGE_SIZE  (uint16_t)0x400  /* Page size = 1KByte */
  #define FLASH_END_ADDRESS 0x08010000

#elif defined (STM32F10X_HD) || defined (STM32F10X_CL)
  #define PAGE_SIZE  (uint16_t)0x800  /* Page size = 2KByte */
  #define FLASH_END_ADDRESS 0x08040000
#endif

/* EEPROM start address in Flash */
#define EEPROM_START_ADDRESS    ((uint32_t)(FLASH_END_ADDRESS - 2 * PAGE_SIZE))

由于已经设置好了条件编译，只需要在合适的位置（默认在stm32f10x.h中）：

#define STM32F10X_HD

标准库的修改

在stm32f10x.h文件中，需要根据所使用的MCU型号，选择对应的宏定义：

/* Uncomment the line below according to the target STM32 device used in your
   application 
  */

#if !defined (STM32F10X_LD) && !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD) && !defined (STM32F10X_HD_VL) && !defined (STM32F10X_XL) && !defined (STM32F10X_CL) 
  /* #define STM32F10X_LD */     /*!< STM32F10X_LD: STM32 Low density devices */
  /* #define STM32F10X_LD_VL */  /*!< STM32F10X_LD_VL: STM32 Low density Value Line devices */  
  /* #define STM32F10X_MD */     /*!< STM32F10X_MD: STM32 Medium density devices */
  /* #define STM32F10X_MD_VL */  /*!< STM32F10X_MD_VL: STM32 Medium density Value Line devices */  
  #define STM32F10X_HD     /*!< STM32F10X_HD: STM32 High density devices */
  /* #define STM32F10X_HD_VL */  /*!< STM32F10X_HD_VL: STM32 High density value line devices */  
  /* #define STM32F10X_XL */     /*!< STM32F10X_XL: STM32 XL-density devices */
  /* #define STM32F10X_CL */     /*!< STM32F10X_CL: STM32 Connectivity line devices */
#endif
/*  Tip: To avoid modifying this file each time you need to switch between these
        devices, you can define the device in your toolchain compiler preprocessor.

 - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers
   where the Flash memory density ranges between 16 and 32 Kbytes.
 - Low-density value line devices are STM32F100xx microcontrollers where the Flash
   memory density ranges between 16 and 32 Kbytes.
 - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers
   where the Flash memory density ranges between 64 and 128 Kbytes.
 - Medium-density value line devices are STM32F100xx microcontrollers where the 
   Flash memory density ranges between 64 and 128 Kbytes.   
 - High-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 256 and 512 Kbytes.
 - High-density value line devices are STM32F100xx microcontrollers where the 
   Flash memory density ranges between 256 and 512 Kbytes.   
 - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 512 and 1024 Kbytes.
 - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
  */