path: root/Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/WWDG/WWDG_RefreshUntilUserEvent_Init/Src/main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    Examples_LL/WWDG/WWDG_RefreshUntilUserEvent_Init/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to configure WWDG down-counter (with Window)
  *          using the STM32WBxx WWDG LL API.
  *          Peripheral initialization done using LL unitary services functions.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2019 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 */
static __IO uint8_t KeyPressed = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_WWDG_Init(void);
/* USER CODE BEGIN PFP */
void     UserButton_Callback(void);
void     Check_WWDG_Reset(void);
void     LED_On(void);
/* 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. */

  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

  /* 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_WWDG_Init();
  /* USER CODE BEGIN 2 */
 
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    if (1 != KeyPressed)
    {
      /* Refresh WWDG Downcounter to initial value ~2s*/
      LL_WWDG_SetCounter(WWDG, 0X7E);
      
      LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
      LL_mDelay(LED_BLINK_FAST);
    }
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  /* HSI configuration and activation */
  LL_RCC_HSI_Enable();
  while(LL_RCC_HSI_IsReady() != 1)
  {
  }

  /* Sysclk activation on the HSI */
  /* Set CPU1 prescaler*/
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_8);

  /* Set CPU2 prescaler*/
  LL_C2_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_8);

  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI)
  {
  }

  /* Set AHB SHARED prescaler*/
  LL_RCC_SetAHB4Prescaler(LL_RCC_SYSCLK_DIV_1);

  /* Set APB1 prescaler*/
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);

  /* Set APB2 prescaler*/
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);

  LL_Init1msTick(2000000);

  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(2000000);
  /* USER CODE BEGIN Smps */

  /* USER CODE END Smps */
}

/**
  * @brief WWDG Initialization Function
  * @param None
  * @retval None
  */
static void MX_WWDG_Init(void)
{

  /* USER CODE BEGIN WWDG_Init 0 */

  /* Check if the system has resumed from WWDG reset*/
  Check_WWDG_Reset();
  
  /* USER CODE END WWDG_Init 0 */

  /* Peripheral clock enable */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_WWDG);

  /* USER CODE BEGIN WWDG_Init 1 */

  /* Configure WWDG */

  /* Refresh WWDG before activate it */
  /* Activate WWDG */
  /* set prescaler to have a rollover each about ~2s */
  /* set window value to same value (~2s) as downcounter in order to ba able to refresh the WWDG almost immediately */

  /* USER CODE END WWDG_Init 1 */
  LL_WWDG_SetCounter(WWDG, 126);
  LL_WWDG_Enable(WWDG);
  LL_WWDG_SetPrescaler(WWDG, LL_WWDG_PRESCALER_8);
  LL_WWDG_SetWindow(WWDG, 126);
  /* USER CODE BEGIN WWDG_Init 2 */

  /* USER CODE END WWDG_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_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);

  /**/
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);

  /**/
  LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTC, LL_SYSCFG_EXTI_LINE4);

  /**/
  EXTI_InitStruct.Line_0_31 = LL_EXTI_LINE_4;
  EXTI_InitStruct.Line_32_63 = LL_EXTI_LINE_NONE;
  EXTI_InitStruct.LineCommand = ENABLE;
  EXTI_InitStruct.Mode = LL_EXTI_MODE_IT;
  EXTI_InitStruct.Trigger = LL_EXTI_TRIGGER_FALLING;
  LL_EXTI_Init(&EXTI_InitStruct);

  /**/
  LL_GPIO_SetPinPull(USER_BUTTON_GPIO_Port, USER_BUTTON_Pin, LL_GPIO_PULL_UP);

  /**/
  LL_GPIO_SetPinMode(USER_BUTTON_GPIO_Port, USER_BUTTON_Pin, LL_GPIO_MODE_INPUT);

  /**/
  GPIO_InitStruct.Pin = LED2_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(LED2_GPIO_Port, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  NVIC_SetPriority(EXTI4_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),3, 0));
  NVIC_EnableIRQ(EXTI4_IRQn);

}

/* USER CODE BEGIN 4 */

/**
  * @brief  This function check if the system has resumed from WWDG reset
  * @param  None
  * @retval None
  */
void Check_WWDG_Reset(void)
{
  if (LL_RCC_IsActiveFlag_WWDGRST())
  {
    /* clear WWDG reset flag */
    LL_RCC_ClearResetFlags();

    /* turn Led on and wait for user event to perform example again */
    LED_On();
    
    while(KeyPressed != 1)
    {
    }

    /* Reset KeyPressed value */
    KeyPressed = 0;
  }
}


/**
  * @brief  Turn-on LED2.
  * @param  None
  * @retval None
  */
void LED_On(void)
{
  /* Turn LED2 on */
  LL_GPIO_SetOutputPin(LED2_GPIO_Port, LED2_Pin);
}


/******************************************************************************/
/*   USER IRQ HANDLER TREATMENT                                               */
/******************************************************************************/
/**
  * @brief  Function to manage IRQ Handler
  * @param  None
  * @retval None
  */
void UserButton_Callback(void)
{
  KeyPressed = 1;
}
/* 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 */
 
  /* 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,
     tex: 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****/