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我手头有一片nucelo STM32F411RE 板子,是透过有源振荡器,osc in ,osc out (空接),然后这个振荡器是由 through STLINK MCO pin of STM32F103 microcontroller. The frequencycannot be changed and is fixed at 8 MHz. 我找不到这两个宏定义STM32F411xE,#define USE_HSE_BYPASS,这个在那边可以找的到 . @$ ~$ u- M* ~6 T( O7 K% H) _2 {9 f3 a; |- P, Y3 y4 G9 | #if defined(STM32F411xE) /*!< Uncomment the following line if you need to clock the STM32F411xE by HSE Bypass5 F/ U% g* k8 A/ f2 k! O# a through STLINK MCO pin of STM32F103 microcontroller. The frequency cannot be changed; L, H) ]( W5 `: m and is fixed at 8 MHz. / S- B% k8 r0 n Hardware configuration needed for Nucleo Board:. H1 W/ c4 B+ l1 U ?SB54, SB55 OFF ?R35 removed1 X' ^4 h9 L+ t. w, I( o, { ?SB16, SB50 ON */' w' w2 I0 E% y8 H" d /* #define USE_HSE_BYPASS */ //这叙述为何被屏蔽掉 j# N( j! U2 L) F T #if defined(USE_HSE_BYPASS) #define HSE_BYPASS_INPUT_FREQUENCY 8000000 #endif /* USE_HSE_BYPASS */ $ {! m, e. M+ m: H #endif /* STM32F411xE */ |
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