STM32 serial port garbled

Problem description

With punctual atoms STM32F4 Explorer development board debugging wildfire scorching sun motor driver , It is found that the serial port output is always garbled . Troubleshoot problems ：

1. Serial port debugging assistant coding method ？ The same serial port debugging assistant , With punctual atoms 、STM32CubeMX The generated program sends data normally . Eliminate the problem of serial port debugging assistant .
2. Serial port configuration function problem ？ Carefully check the serial port configuration ,GPIO To configure , use STM32CubeMX Replace with the scorching sun program , The problem is still there .
3. HAL Interference of other files in the library ？ Delete redundant HAL The library files , And STM32CubeMX The library files used are consistent . The problem is still there .
4. Reference resources STM32 Detailed processing method of serial communication garbled code , change stm32f4xx_hal_conf.h In file HSE_VALUE = 8000000, The clock frequency of external crystal oscillator is set here , and SystemClock_Config() Function RCC_OscInitStruct.PLL.PLLM = 8; yes PLLM Division coefficient . Many parameters in the system are called directly HSE_VALUE Value , So be sure to change this value .

#if !defined (HSE_VALUE)
  #define HSE_VALUE 8000000U /*!< Value of the External oscillator in Hz */
#endif /* HSE_VALUE */

/** * @brief System Clock Configuration * @retval None */
void SystemClock_Config(void)
{
    
  RCC_OscInitTypeDef RCC_OscInitStruct = {
    0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {
    0};

  /** Configure the main internal regulator output voltage */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses 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_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    
    Error_Handler();
  }
}

Reference resources ：
STM32 Detailed processing method of serial communication garbled code