Nucleo STM32F411RE BOARD 問題

jxchen

MCO from ST-LINK: MCO output of ST-LINK MCU is used as input clock. Thisfrequency cannot be changed, it is fixed at 8 MHz
Nucleo STM32F411RE BOARD, 我用標準庫移值,我現在有個問題, is fixed at 8 MHz,

STM32F4XX.H 檔案,有一段程式碼如下:
我在Keil C/C++ 頁面, USE_STDPERIPH_DRIVER,STM32F411xE
我已經在Keil C/C++ 頁面已定義,"STM32F411xE",HSE_VALU我沒找到在那定義,如果是這樣的話,不就把#define HSE_VALUE    ((uint32_t)25000000) // 給定義了嗎 ,這樣不就對應不起來,我想知道的話,我直接修改#define HSE_VALUE    ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */可以嗎
//====================AAA===============================================
#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 */
//====================AAA==============================================
#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 */
/**

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