/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    HAL/HAL_TimeBase/Src/main.c 
  * @author  MCD Application Team
  * @brief   This example describes how to configure HAL time base using
  *          the STM32WLxx HAL API.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* 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 */
TIM_HandleTypeDef htim2;
/* Private variables ---------------------------------------------------------*/
uint32_t                 uwIncrementState = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/

/* 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. */
  HAL_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 */
  /* USER CODE BEGIN 2 */
  /* Configure LED2 */
  BSP_LED_Init(LED2);

  /* Configure User push-button */
  BSP_PB_Init(BUTTON_SW1, BUTTON_MODE_EXTI);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
    /* Insert a 1s delay */
    HAL_Delay(1000);
    
    /* Toggle LED2 */
    BSP_LED_Toggle(LED2);
  }
  /* USER CODE END 3 */
}

/**
  * @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_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK3|RCC_CLOCKTYPE_HCLK
                              |RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
                              |RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;

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

/* USER CODE BEGIN 4 */

/**
  * @brief  This function configures the TIM2 as a time base source. 
  *         The time source is configured  to have 1ms time base with a dedicated 
  *         Tick interrupt priority. 
  * @note   This function is called  automatically at the beginning of program after
  *         reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig(). 
  * @param  TickPriority: Tick interrupt priority.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority)
{
  RCC_ClkInitTypeDef    clkconfig;
  uint32_t              uwTimclock, uwAPB1Prescaler = 0;
  uint32_t              uwPrescalerValue = 0;
  uint32_t              pFLatency;
  
    /*Configure the TIM2 IRQ priority */
  HAL_NVIC_SetPriority(TIM2_IRQn, TickPriority ,0);
  
  /* Enable the TIM2 global Interrupt */
  HAL_NVIC_EnableIRQ(TIM2_IRQn);
  
  /* Enable TIM2 clock */
  __HAL_RCC_TIM2_CLK_ENABLE();
  
  /* Get clock configuration */
  HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
  
  /* Get APB1 prescaler */
  uwAPB1Prescaler = clkconfig.APB1CLKDivider;
  
  /* Compute TIM2 clock */
  if (uwAPB1Prescaler == RCC_HCLK_DIV1) 
  {
    uwTimclock = HAL_RCC_GetPCLK1Freq();
  }
  else
  {
    uwTimclock = 2*HAL_RCC_GetPCLK1Freq();
  }

  /* Compute the prescaler value to have TIM2 counter clock equal to 1MHz */
  uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000) - 1);
  
  /* Initialize TIM2 */
  htim2.Instance = TIM2;
    
  /* Initialize TIMx peripheral as follow:
       + Period = [(TIM2CLK/1000) - 1]. to have a (1/1000) s time base.
       + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock.
       + ClockDivision = 0
       + Counter direction = Up
  */
  htim2.Init.Period = (1000000 / 1000) - 1;
  htim2.Init.Prescaler = uwPrescalerValue;
  htim2.Init.ClockDivision = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  if(HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
  
  /* Start the TIM time Base generation in interrupt mode */
  if(HAL_TIM_Base_Start_IT(&htim2) != HAL_OK)
  {
    /* Starting Error */
    Error_Handler();
  }
 

   /* Return function status */
  return HAL_OK;
}

/**
  * @brief  Suspend Tick increment.
  * @note   Disable the tick increment by disabling TIM2 update interrupt.
  * @param  None
  * @retval None
  */
void HAL_SuspendTick(void)
{
  /* Disable TIM2 update Interrupt */
  __HAL_TIM_DISABLE_IT(&htim2, TIM_IT_UPDATE);
}

/**
  * @brief  Resume Tick increment.
  * @note   Enable the tick increment by Enabling TIM2 update interrupt.
  * @param  None
  * @retval None
  */
void HAL_ResumeTick(void)
{
  /* Enable TIM2 Update interrupt */
  __HAL_TIM_ENABLE_IT(&htim2, TIM_IT_UPDATE);
}

/**
  * @brief  Period elapsed callback in non blocking mode
  * @note   This function is called  when TIM2 interrupt took place, inside
  * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
  * a global variable "uwTick" used as application time base.
  * @param  htim : TIM handle
  * @retval None
  */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  HAL_IncTick();
}

/**
  * @brief EXTI line detection callback.
  * @param GPIO_Pin: Specifies the pins connected EXTI line
  * @retval None
  */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == BUTTON_SW1_PIN)
  {
    if (uwIncrementState == 0)
    {
      /* Suspend tick increment */
      HAL_SuspendTick();
      
      /* Change the Push button state */
      uwIncrementState = 1;
    }
    else
    {
      /* Resume tick increment */
      HAL_ResumeTick();
      
      /* Change the Push button state */
      uwIncrementState = 0;
    }
  }  
}

/* 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 */
  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 */