STM32 define 問題

jxchen

我想問一個問題,打開system_stm32f4xx.h
我找不到這兩個宏定義STM32F411xE,USE_HSE_BYPASS,這個在那邊可以找的到

#if defined(STM32F411xE)    /*!< Uncomment the following line if you need to clock the STM32F411xE by HSE Bypass
     through STLINK MCO pin of STM32F103 microcontroller. The frequency cannot be changed
     and is fixed at 8 MHz.
     Hardware configuration needed for Nucleo Board:
     ?SB54, SB55 OFF
     ?R35 removed
     ?SB16, SB50 ON */
/* #define USE_HSE_BYPASS */

#if defined(USE_HSE_BYPASS)     
#define HSE_BYPASS_INPUT_FREQUENCY   8000000
#endif /* USE_HSE_BYPASS */   
#endif /* STM32F411xE */

Brave000

这个是在魔术棒上c++选项上定义的哦

jxchen

了解,system_stm32f4xx.h  st公司针对在魔术棒上c++选项上定义用那个芯片型号就用判断要执行那个程序

jxchen

所以固件库system_stm32f4xx.h 跟本不要动它,除非你要改动例如時鐘頻率不同,那要對這個程序非常了解才能