STM32 Keil设置中C/C++预处理符号中define STM32F10X_MD和USE_STDPERIPH_DRIVER的作用

M32F10X_MD

M32F10X_MD,USE_STDPERIPH_DRIVER是两个宏定义，其中M32F10X_MD的作用是说明你所使用的芯片容量大小，例如在stm32f10x.h中如果我们没有定义一种芯片容量，就会报错。

stm32f10x.h

#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)
#error "Please select first the target STM32F10x device used in your application (in stm32f10x.h file)"
#endif

再比如在启动文件调运行main()函数之前调用的SystemInit，也是根据我们定义的容量类型来进行初始化的

void SystemInit (void)
{
  /* Reset the RCC clock configuration to the default reset state(for debug purpose) */
  /* Set HSION bit */
  RCC->CR |= (uint32_t)0x00000001;

  /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
#ifndef STM32F10X_CL
  RCC->CFGR &= (uint32_t)0xF8FF0000;
#else
  RCC->CFGR &= (uint32_t)0xF0FF0000;
#endif /* STM32F10X_CL */   
  
  /* Reset HSEON, CSSON and PLLON bits */
  RCC->CR &= (uint32_t)0xFEF6FFFF;

  /* Reset HSEBYP bit */
  RCC->CR &= (uint32_t)0xFFFBFFFF;

  /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
  RCC->CFGR &= (uint32_t)0xFF80FFFF;

#ifdef STM32F10X_CL
  /* Reset PLL2ON and PLL3ON bits */
  RCC->CR &= (uint32_t)0xEBFFFFFF;

  /* Disable all interrupts and clear pending bits  */
  RCC->CIR = 0x00FF0000;

  /* Reset CFGR2 register */
  RCC->CFGR2 = 0x00000000;
#elif defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL)
  /* Disable all interrupts and clear pending bits  */
  RCC->CIR = 0x009F0000;

  /* Reset CFGR2 register */
  RCC->CFGR2 = 0x00000000;      
#else
  /* Disable all interrupts and clear pending bits  */
  RCC->CIR = 0x009F0000;
#endif /* STM32F10X_CL */
    
#if defined (STM32F10X_HD) || (defined STM32F10X_XL) || (defined STM32F10X_HD_VL)
  #ifdef DATA_IN_ExtSRAM
    SystemInit_ExtMemCtl(); 
  #endif /* DATA_IN_ExtSRAM */
#endif 

  /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */
  /* Configure the Flash Latency cycles and enable prefetch buffer */
  SetSysClock();

#ifdef VECT_TAB_SRAM
  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
#else
  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
#endif 
}

SystemInit()这里主要根据我们选择的芯片容量来对系统时钟进行初始化，会配置系统时钟。

 一般会打开HSE外部高速时钟（HSE外部8M）作为系统时钟源，设置PLL的倍频数，例如9倍频，那么输出的PLLCLK作为SYSCLK就是8*9=72M，同时还会配置外设总线AHB的分频系数，高速外设总线APB2，低速外设总线APB1的分频系数。

USE_STDPERIPH_DRIVER

这个宏的作用是使用标准库的外设驱动程序，如果要使用标准固件库的驱动程序就需要定义这个宏。在stm32f10x.h中如果我们定义了USE_STDPERIPH_DRIVER,就会包含stm32f10x_conf.h，而stm32f10x_conf.h中包含了外设驱动程序。

stm32f10x.h

#ifdef USE_STDPERIPH_DRIVER
  #include "stm32f10x_conf.h"
#endif

stm32f10x_conf.h


/* Includes ------------------------------------------------------------------*/
/* Uncomment/Comment the line below to enable/disable peripheral header file inclusion */
#include "stm32f10x_adc.h"
#include "stm32f10x_bkp.h"
#include "stm32f10x_can.h"
#include "stm32f10x_cec.h"
#include "stm32f10x_crc.h"
#include "stm32f10x_dac.h"
#include "stm32f10x_dbgmcu.h"
#include "stm32f10x_dma.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_flash.h"
#include "stm32f10x_fsmc.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_i2c.h"
#include "stm32f10x_iwdg.h"
#include "stm32f10x_pwr.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_rtc.h"
#include "stm32f10x_sdio.h"
#include "stm32f10x_spi.h"
#include "stm32f10x_tim.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_wwdg.h"
#include "misc.h" /* High level functions for NVIC and SysTick (add-on to CMSIS functions) */

如果使用HAL库的话，则需要设置不同的两个宏，但意思一样，也是选择芯片型号以及使用HAL库，可以参考下图，这里就不再描述。

#if defined(STM32F100xB)
  #include "stm32f100xb.h"
#elif defined(STM32F100xE)
  #include "stm32f100xe.h"
#elif defined(STM32F101x6)
  #include "stm32f101x6.h"
#elif defined(STM32F101xB)
  #include "stm32f101xb.h"
#elif defined(STM32F101xE)
  #include "stm32f101xe.h"
#elif defined(STM32F101xG)
  #include "stm32f101xg.h"
#elif defined(STM32F102x6)
  #include "stm32f102x6.h"
#elif defined(STM32F102xB)
  #include "stm32f102xb.h"
#elif defined(STM32F103x6)
  #include "stm32f103x6.h"
#elif defined(STM32F103xB)
  #include "stm32f103xb.h"
#elif defined(STM32F103xE)
  #include "stm32f103xe.h"
#elif defined(STM32F103xG)
  #include "stm32f103xg.h"
#elif defined(STM32F105xC)
  #include "stm32f105xc.h"
#elif defined(STM32F107xC)
  #include "stm32f107xc.h"
#else
 #error "Please select first the target STM32F1xx device used in your application (in stm32f1xx.h file)"
#endif

#if defined (USE_HAL_DRIVER)
 #include "stm32f1xx_hal.h"
#endif /* USE_HAL_DRIVER */

作者：悲伤番茄炒蛋yf