改为外部时钟源后UART1打印乱码

发布于 2022-07-26 11:48:11 浏览：695 订阅该版

把内部时钟改为使用外部时钟后，UART打印输出的都是乱码，有人遇到过吗？是不是还要改其他地方，波特率是115200，晶振为8MHz,以下是代码：
#include "board.h"
#define USE_HSE 1

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

/** Initializes the CPU, AHB and APB busses clocks 
  */
  #if USE_HSE
  {
	  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
	  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
	  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
	  //RCC_OscInitStruct.HSIState = RCC_HSI_ON;
	  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
	  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
	  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  }
  #else
  {
	  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
	  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
	  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; //16
	  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
	  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
	  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
  }
  #endif
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}