现在进一步确认： 这个是导致问题的最终元凶： GPIO_InitStructure.GPIO_OType=GPIO_OType_PP
*============================================================================= * Supported STM32F42xxx/43xxx devices *----------------------------------------------------------------------------- * System Clock source | PLL (HSE) *----------------------------------------------------------------------------- * SYSCLK(Hz) | 180000000 *----------------------------------------------------------------------------- * HCLK(Hz) | 180000000 *----------------------------------------------------------------------------- * AHB Prescaler | 1 *----------------------------------------------------------------------------- * APB1 Prescaler | 4 *----------------------------------------------------------------------------- * APB2 Prescaler | 2 *----------------------------------------------------------------------------- * HSE Frequency(Hz) | 25000000 *----------------------------------------------------------------------------- * LL_M | 25 *----------------------------------------------------------------------------- * LL_N | 360 *----------------------------------------------------------------------------- * LL_P | 2 *----------------------------------------------------------------------------- * LL_Q | 7 *----------------------------------------------------------------------------- * LLI2S_N | NA *----------------------------------------------------------------------------- * LLI2S_R | NA *----------------------------------------------------------------------------- * I2S input clock | NA *----------------------------------------------------------------------------- * VDD(V) | 3.3 *----------------------------------------------------------------------------- * Main regulator output voltage | Scale1 mode *----------------------------------------------------------------------------- * Flash Latency(WS) | 5 *----------------------------------------------------------------------------- * refetch Buffer | ON *----------------------------------------------------------------------------- * Instruction cache | ON *----------------------------------------------------------------------------- * Data cache | ON *----------------------------------------------------------------------------- * Require 48MHz for USB OTG FS, | Disabled * SDIO and RNG clock | *----------------------------------------------------------------------------- *=============================================================================复制代码#if !defined (HSE_VALUE) #define HSE_VALUE ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */ #endif /* HSE_VALUE */复制代码楼主可以直接修改stm32f4xx.h和system_stm32f4xx.c中的HSE_VALUE 、PLL_M这两个参数就够了，其他的都不用改，更不用多一个配置时钟的函数！
