/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    Examples_LL/RTC/RTC_TimeStamp_Init/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to configure Time Stamp feature through
  *          the STM32WLxx RTC LL API.
  *          Peripheral initialization done using LL unitary services functions.
  ******************************************************************************
  * @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 */

/* Defines related to Clock configuration */
/* Uncomment to enable the adequate Clock Source */
#define RTC_CLOCK_SOURCE_LSI
/*#define RTC_CLOCK_SOURCE_LSE*/

#ifdef RTC_CLOCK_SOURCE_LSI
/* ck_apre=LSIFreq/(ASYNC prediv + 1) with LSIFreq=32 kHz RC */
#define RTC_ASYNCH_PREDIV          ((uint32_t)0x7C)
/* ck_spre=ck_apre/(SYNC prediv + 1) = 1 Hz */
#define RTC_SYNCH_PREDIV           ((uint32_t)0x00FF)
#endif

#ifdef RTC_CLOCK_SOURCE_LSE
/* ck_apre=LSEFreq/(ASYNC prediv + 1) = 256Hz with LSEFreq=32768Hz */
#define RTC_ASYNCH_PREDIV          ((uint32_t)0x7F)
/* ck_spre=ck_apre/(SYNC prediv + 1) = 1 Hz */
#define RTC_SYNCH_PREDIV           ((uint32_t)0x00FF)
#endif
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Buffers used for displaying Time and Date */
uint8_t aShowTime[16]      = "hh:ms:ss";
uint8_t aShowTimeStamp[16] = "hh:ms:ss";
uint8_t aShowDate[16]      = "mm/dd/aaaa";
uint8_t aShowDateStamp[16] = "mm/dd/aaaa";

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_RTC_Init(void);
/* USER CODE BEGIN PFP */
uint32_t WaitForSynchro_RTC(void);
void     Show_RTC_Calendar(void);
void     LED_Blinking(uint32_t Period);
/* 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. */

  /* System interrupt init*/
  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

  /* 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_RTC_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* Display the updated Time and Date */
    Show_RTC_Calendar();
    /* 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_2);
  while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_2)
  {
  }

  LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
  LL_RCC_LSI_Enable();

   /* Wait till LSI is ready */
  while(LL_RCC_LSI_IsReady() != 1)
  {
  }

  LL_RCC_MSI_Enable();

   /* Wait till MSI is ready */
  while(LL_RCC_MSI_IsReady() != 1)
  {
  }

  LL_RCC_MSI_EnableRangeSelection();
  LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_11);
  LL_RCC_MSI_SetCalibTrimming(0);
  LL_PWR_EnableBkUpAccess();
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_MSI);

   /* Wait till System clock is ready */
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_MSI)
  {
  }

  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
  LL_RCC_SetAHB3Prescaler(LL_RCC_SYSCLK_DIV_1);
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);

  LL_Init1msTick(48000000);

  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(48000000);
}

/**
  * @brief RTC Initialization Function
  * @param None
  * @retval None
  */
static void MX_RTC_Init(void)
{

  /* USER CODE BEGIN RTC_Init 0 */

  /* USER CODE END RTC_Init 0 */

  LL_RTC_InitTypeDef RTC_InitStruct = {0};
  LL_RTC_TimeTypeDef RTC_TimeStruct = {0};
  LL_RTC_DateTypeDef RTC_DateStruct = {0};

  if(LL_RCC_GetRTCClockSource() != LL_RCC_RTC_CLKSOURCE_LSI)
  {
    LL_RCC_ForceBackupDomainReset();
    LL_RCC_ReleaseBackupDomainReset();
    LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSI);
  }

  /* Peripheral clock enable */
  LL_RCC_EnableRTC();
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_RTCAPB);

  /* USER CODE BEGIN RTC_Init 1 */

  /* RTC interrupt Init */
  NVIC_SetPriority(TAMP_STAMP_LSECSS_SSRU_IRQn, 0x0F);
  NVIC_EnableIRQ(TAMP_STAMP_LSECSS_SSRU_IRQn);

  /*Disable RTC registers write protection */
  LL_RTC_DisableWriteProtection(RTC);

  /* Configure the Time Stamp peripheral */
  /* Set RTC TimeStamp event generation */
  LL_RTC_TS_SetActiveEdge(RTC, LL_RTC_TIMESTAMP_EDGE_RISING);
  LL_RTC_TS_Enable(RTC);

  /* Enable IT timestamp */
  LL_RTC_EnableIT_TS(RTC);

  /* RTC timestamp Interrupt Configuration: EXTI configuration */
  LL_EXTI_EnableIT_0_31(LL_EXTI_LINE_13);
  LL_EXTI_EnableRisingTrig_0_31(LL_EXTI_LINE_13);

  /* USER CODE END RTC_Init 1 */
  /** Initialize RTC and set the Time and Date
  */
  RTC_InitStruct.HourFormat = LL_RTC_HOURFORMAT_24HOUR;
  RTC_InitStruct.AsynchPrescaler = RTC_ASYNCH_PREDIV;
  RTC_InitStruct.SynchPrescaler = RTC_SYNCH_PREDIV;
  LL_RTC_Init(RTC, &RTC_InitStruct);
  LL_RTC_SetBinaryMode(RTC, LL_RTC_BINARY_NONE);
  /** Initialize RTC and set the Time and Date
  */
  RTC_TimeStruct.Hours = 0x11;
  RTC_TimeStruct.Minutes = 0x59;
  RTC_TimeStruct.Seconds = 0x55;

  LL_RTC_TIME_Init(RTC, LL_RTC_FORMAT_BCD, &RTC_TimeStruct);
  RTC_DateStruct.WeekDay = LL_RTC_WEEKDAY_TUESDAY;
  RTC_DateStruct.Month = LL_RTC_MONTH_MAY;
  RTC_DateStruct.Day = 0x26;
  RTC_DateStruct.Year = 0x20;

  LL_RTC_DATE_Init(RTC, LL_RTC_FORMAT_BCD, &RTC_DateStruct);
  /* USER CODE BEGIN RTC_Init 2 */

  /* Enable RTC registers write protection */
  LL_RTC_EnableWriteProtection(RTC);
  /* USER CODE END RTC_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);

  /**/
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);

  /**/
  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);

}

/* USER CODE BEGIN 4 */
/**
  * @brief  Wait until the RTC Time and Date registers (RTC_TR and RTC_DR) are
  *         synchronized with RTC APB clock.
  * @param  None
  * @retval RTC_ERROR_NONE if no error (RTC_ERROR_TIMEOUT will occur if RTC is
  *         not synchronized)
  */
uint32_t WaitForSynchro_RTC(void)
{
  /* Clear RSF flag */
  LL_RTC_ClearFlag_RS(RTC);

#if (USE_TIMEOUT == 1)
  Timeout = RTC_TIMEOUT_VALUE;
#endif /* USE_TIMEOUT */

  /* Wait the registers to be synchronised */
  while (LL_RTC_IsActiveFlag_RS(RTC) != 1)
  {
#if (USE_TIMEOUT == 1)
    if (LL_SYSTICK_IsActiveCounterFlag())
    {
      Timeout --;
    }
    if (Timeout == 0)
    {
      return RTC_ERROR_TIMEOUT;
    }
#endif /* USE_TIMEOUT */
  }
  return RTC_ERROR_NONE;
}

/**
  * @brief  Display the current time and date.
  * @param  None
  * @retval None
  */
void Show_RTC_Calendar(void)
{
  /* Note: need to convert in decimal value in using __LL_RTC_CONVERT_BCD2BIN helper macro */
  /* Display time Format : hh:mm:ss */
  sprintf((char *)aShowTime, "%.2d:%.2d:%.2d", __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TIME_GetHour(RTC)),
          __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TIME_GetMinute(RTC)),
          __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TIME_GetSecond(RTC)));
  /* Display date Format : mm-dd-yy */
  sprintf((char *)aShowDate, "%.2d-%.2d-%.2d", __LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetMonth(RTC)),
          __LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetDay(RTC)),
          2000 + __LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetYear(RTC)));
}

/**
  * @brief  Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
  * @param  Period : Period of time (in ms) between each toggling of LED
  *   This parameter can be user defined values. Pre-defined values used in that example are :
  *     @arg LED_BLINK_FAST : Fast Blinking
  *     @arg LED_BLINK_SLOW : Slow Blinking
  *     @arg LED_BLINK_ERROR : Error specific Blinking
  * @retval None
  */
void LED_Blinking(uint32_t Period)
{
  /* Toggle IO in an infinite loop */
  while (1)
  {
    LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
    LL_mDelay(Period);
  }
}

/******************************************************************************/
/*   USER IRQ HANDLER TREATMENT                                               */
/******************************************************************************/
/**
  * @brief  Function to manage Timestamp event IRQ
  * @param  None
  * @retval None
  */
void TimeStampEvent_Callback(void)
{
  /* Note: need to convert in decimal value in using __LL_RTC_CONVERT_BCD2BIN helper macro */
  /* Display time Format : hh:mm:ss */
  sprintf((char *)aShowTimeStamp, "%.2d:%.2d:%.2d", __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TS_GetHour(RTC)),
          __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TS_GetMinute(RTC)),
          __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TS_GetSecond(RTC)));
  /* Display date Format : mm-dd */
  sprintf((char *)aShowDateStamp, "%.2d-%.2d-%.2d", __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TS_GetMonth(RTC)),
          __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TS_GetDate(RTC)),
          2000 + __LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetYear(RTC)));
}

/* 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 */
  LED_Blinking(LED_BLINK_ERROR);
  /* 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) */

  /* Infinite loop */
  while (1)
  {
  }
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
