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• MCO from ST-LINK: MCO output of ST-LINK MCU is used as input clock. This
frequency cannot be changed, it is fixed at 8 MHz and connected to PF0/PD0/PH0-
OSC_IN of STM32 microcontroller.
我手頭有片Nucleo STM32F411RE BOARD,外部晶振8MZ,固定不能改,我在Keil C/C++ 頁面定義:USE_STDPERIPH_DRIVER,STM32F411xE,我移值标准固件库,
SYSTEM_STMF32F4XX.H,下列藍色字體判斷STM32F411xE關鍵字有效,就會執行這句 #define HSE_VALUE ((uint32_t)25000000) /*!< Value of the External oscillator in Hz
就跟原廠定義8MHZ不同,我需要調整為: 8MHZ,還是不用理它!!!!
#if defined(STM32F40_41xxx) || defined(STM32F427_437xx) || defined(STM32F429_439xx) || defined(STM32F401xx) || defined(STM32F411xE)
#if !defined (HSE_VALUE)
#define HSE_VALUE ((uint32_t)25000000) /*!< Value of the External oscillator in Hz
#endif /* HSE_VALUE */
#elif defined(STM32F446xx)
#if !defined (HSE_VALUE)
#define HSE_VALUE ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */
#endif /* HSE_VALUE */
#endif /* STM32F40_41xxx || STM32F427_437xx || STM32F429_439xx || STM32F401xx || STM32F411xE */
/** |
阿莫论坛20周年了！感谢大家的支持与爱护！！
知道什么是神吗？其实神本来也是人，只不过神做了人做不到的事情 所以才成了神。 （头文字D, 杜汶泽）
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发表于 2019-1-21 22:20:44
楼主