text: /* USER CODE BEGIN Header */
  /**
    ******************************************************************************
    * @file           : main.c
    * @brief          : Main program body
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
    * All rights reserved.</center></h2>
    *
    * This software component is licensed by ST under BSD 3-Clause license,
    * the "License"; You may not use this file except in compliance with the
    * License. You may obtain a copy of the License at:
    *                        opensource.org/licenses/BSD-3-Clause
    *
    ******************************************************************************
    */
  /* USER CODE END Header */
  /* Includes ------------------------------------------------------------------*/
  #include "main.h"
  
  /* Private includes ----------------------------------------------------------*/
  /* USER CODE BEGIN Includes */
  
  /* USER CODE END Includes */
  
  /* Private typedef -----------------------------------------------------------*/
  /* USER CODE BEGIN PTD */
  
  /* USER CODE END PTD */
  
  /* Private define ------------------------------------------------------------*/
  /* USER CODE BEGIN PD */
  /* USER CODE END PD */
  
  /* Private macro -------------------------------------------------------------*/
  /* USER CODE BEGIN PM */
  
  /* USER CODE END PM */
  
  /* Private variables ---------------------------------------------------------*/
  
  /* USER CODE BEGIN PV */
  
  /* USER CODE END PV */
  
  /* Private function prototypes -----------------------------------------------*/
  void SystemClock_Config(void);
  static void MX_GPIO_Init(void);
  static void MX_USART2_UART_Init(void);
  /* USER CODE BEGIN PFP */
  
  /* USER CODE END PFP */
  
  /* Private user code ---------------------------------------------------------*/
  /* USER CODE BEGIN 0 */
  
  /* USER CODE END 0 */
  
  /**
    * @brief  The application entry point.
    * @retval int
    */
  int main(void)
  {
    /* USER CODE BEGIN 1 */
  
    /* USER CODE END 1 */
  
    /* MCU Configuration--------------------------------------------------------*/
  
    /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  
    LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
  
    /* System interrupt init*/
  
    /* USER CODE BEGIN Init */
  
    /* USER CODE END Init */
  
    /* Configure the system clock */
    SystemClock_Config();
  
    /* USER CODE BEGIN SysInit */
  
    /* USER CODE END SysInit */
  
    /* Initialize all configured peripherals */
    MX_GPIO_Init();
    MX_USART2_UART_Init();
    /* USER CODE BEGIN 2 */
  
    /* USER CODE END 2 */
  
    /* Infinite loop */
    /* USER CODE BEGIN WHILE */
    while (1)
    {
      /* USER CODE END WHILE */
  
      /* USER CODE BEGIN 3 */
    }
    /* USER CODE END 3 */
  }
  
  /**
    * @brief System Clock Configuration
    * @retval None
    */
  void SystemClock_Config(void)
  {
    LL_FLASH_SetLatency(LL_FLASH_LATENCY_1);
    while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_1)
    {
    }
    LL_RCC_HSI_Enable();
  
     /* Wait till HSI is ready */
    while(LL_RCC_HSI_IsReady() != 1)
    {
  
    }
    LL_RCC_HSI_SetCalibTrimming(16);
    LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI_DIV_2, LL_RCC_PLL_MUL_12);
    LL_RCC_PLL_Enable();
  
     /* Wait till PLL is ready */
    while(LL_RCC_PLL_IsReady() != 1)
    {
  
    }
    LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
    LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
    LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
  
     /* Wait till System clock is ready */
    while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
    {
  
    }
    LL_Init1msTick(48000000);
    LL_SetSystemCoreClock(48000000);
  }
  
  /**
    * @brief USART2 Initialization Function
    * @param None
    * @retval None
    */
  static void MX_USART2_UART_Init(void)
  {
  
    /* USER CODE BEGIN USART2_Init 0 */
  
    /* USER CODE END USART2_Init 0 */
  
    LL_USART_InitTypeDef USART_InitStruct = {0};
  
    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  
    /* Peripheral clock enable */
    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USART2);
  
    LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
    /**USART2 GPIO Configuration
    PA2   ------> USART2_TX
    PA3   ------> USART2_RX
    */
    GPIO_InitStruct.Pin = USART_TX_Pin;
    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
    GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
    LL_GPIO_Init(USART_TX_GPIO_Port, &GPIO_InitStruct);
  
    GPIO_InitStruct.Pin = USART_RX_Pin;
    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
    GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
    LL_GPIO_Init(USART_RX_GPIO_Port, &GPIO_InitStruct);
  
    /* USART2 interrupt Init */
    NVIC_SetPriority(USART2_IRQn, 0);
    NVIC_EnableIRQ(USART2_IRQn);
  
    /* USER CODE BEGIN USART2_Init 1 */
  
    /* USER CODE END USART2_Init 1 */
    USART_InitStruct.BaudRate = 115200;
    USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
    USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
    USART_InitStruct.Parity = LL_USART_PARITY_NONE;
    USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
    USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
    USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
    LL_USART_Init(USART2, &USART_InitStruct);
    LL_USART_DisableIT_CTS(USART2);
    LL_USART_ConfigAsyncMode(USART2);
    LL_USART_Enable(USART2);
    /* USER CODE BEGIN USART2_Init 2 */
  
    /* USER CODE END USART2_Init 2 */
  
  }
  
  /**
    * @brief GPIO Initialization Function
    * @param None
    * @retval None
    */
  static void MX_GPIO_Init(void)
  {
    LL_EXTI_InitTypeDef EXTI_InitStruct = {0};
    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  
    /* GPIO Ports Clock Enable */
    LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOC);
    LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOF);
    LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
  
    /**/
    LL_GPIO_ResetOutputPin(LD2_GPIO_Port, LD2_Pin);
  
    /**/
    LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTC, LL_SYSCFG_EXTI_LINE13);
  
    /**/
    LL_GPIO_SetPinPull(B1_GPIO_Port, B1_Pin, LL_GPIO_PULL_NO);
  
    /**/
    LL_GPIO_SetPinMode(B1_GPIO_Port, B1_Pin, LL_GPIO_MODE_INPUT);
  
    /**/
    EXTI_InitStruct.Line_0_31 = LL_EXTI_LINE_13;
    EXTI_InitStruct.LineCommand = ENABLE;
    EXTI_InitStruct.Mode = LL_EXTI_MODE_IT;
    EXTI_InitStruct.Trigger = LL_EXTI_TRIGGER_FALLING;
    LL_EXTI_Init(&EXTI_InitStruct);
  
    /**/
    GPIO_InitStruct.Pin = LD2_Pin;
    GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
    LL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
  
  }
  
  /* USER CODE BEGIN 4 */
  
  /* USER CODE END 4 */
  
  /**
    * @brief  This function is executed in case of error occurrence.
    * @retval None
    */
  void Error_Handler(void)
  {
    /* USER CODE BEGIN Error_Handler_Debug */
    /* User can add his own implementation to report the HAL error return state */
    __disable_irq();
    while (1)
    {
    }
    /* USER CODE END Error_Handler_Debug */
  }
  
  #ifdef  USE_FULL_ASSERT
  /**
    * @brief  Reports the name of the source file and the source line number
    *         where the assert_param error has occurred.
    * @param  file: pointer to the source file name
    * @param  line: assert_param error line source number
    * @retval None
    */
  void assert_failed(uint8_t *file, uint32_t line)
  {
    /* USER CODE BEGIN 6 */
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
    /* USER CODE END 6 */
  }
  #endif /* USE_FULL_ASSERT */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  