经过今天的努力，发现是 PLL configuration register (RCC_PLLCFGR)寄存器HAL库配置不正确，我就做了一下修改 在main.c里 /**Initializes the CPU, AHB and APB busses clocks */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 1; RCC_OscInitStruct.PLL.PLLN = 20; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7; RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2; RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2; ------------------------------------------------------------ 在stm32l4xx_hal_rcc.h 里 #if defined(RCC_PLLP_DIV_2_31_SUPPORT) #define __HAL_RCC_PLL_CONFIG(__PLLSOURCE__, __PLLM__, __PLLN__, __PLLP__, __PLLQ__,__PLLR__ ) \ (RCC -> PLLCFGR = (uint32_t)(((__PLLM__) - 1U) << 4U) | (uint32_t)((__PLLN__) << 8U) | \ (__PLLSOURCE__) | (uint32_t)((((__PLLQ__) >> 1U) - 1U) << 21U) | (uint32_t)((((__PLLR__) >> 1U) - 1U) << 25U) | \ (uint32_t)(((__PLLP__) >> 4U ) << 17U) | (uint32_t)(1 << 24U)) #else #define __HAL_RCC_PLL_CONFIG(__PLLSOURCE__, __PLLM__, __PLLN__, __PLLP__, __PLLQ__,__PLLR__ ) \ (RCC -> PLLCFGR = (uint32_t)(((__PLLM__) - 1U) << 4U) | (uint32_t)((__PLLN__) << 8U) | \ (uint32_t)(((__PLLP__) >> 4U ) << 17U) | \ (__PLLSOURCE__) | (uint32_t)((((__PLLQ__) >> 1U) - 1U) << 21U) | (uint32_t)((((__PLLR__) >> 1U) - 1U) << 25U)) #endif /* RCC_PLLP_DIV_2_31_SUPPORT */ 居然能用了
