/**
  ******************************************************************************
  * @file    main.c
  * @author  MCU Application Team
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2023 Puya Semiconductor Co.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by Puya 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
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 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
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef RTCinit;
RTC_TimeTypeDef RTCtime;
RTC_AlarmTypeDef RTC_AlarmStruct;

/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#define RTC_24H_TO_SEC (24 * 60 * 60) /* 24 hours to seconds */

/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockConfig(void);
static void APP_RtcInit(void);
static void APP_RtcSetAlarm(void);

/**
  * @brief  Main program.
  * @retval int
  */
int main(void)
{
  /* Reset of all peripherals, Initializes the Systick. */
  HAL_Init();
  
  /* Configure system clock */
  APP_SystemClockConfig(); 

  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* Initialize button */
  BSP_PB_Init(BUTTON_KEY,BUTTON_MODE_GPIO);

  /* Configure UART */
  DEBUG_UART_Config();
  
  /* RTC initialization */
  APP_RtcInit();
  
  /* Turn on LED */
  BSP_LED_On(LED_GREEN);
  
  /* Wait for button press */
  while(BSP_PB_GetState(BUTTON_KEY) == 0);
  
  /* Get current RTC time in binary format */
  HAL_RTC_GetTime(&RTCinit,&RTCtime,RTC_FORMAT_BIN);
  
  /* Configure the time of the first alarm in binary format */
  RTC_AlarmStruct.AlarmTime = RTCtime;
  RTC_AlarmStruct.AlarmTime.Seconds += 1;
  HAL_RTC_SetAlarm_IT(&RTCinit, &RTC_AlarmStruct, RTC_FORMAT_BIN);
  
   /* Turn off LED */
  BSP_LED_Off(LED_GREEN);
  while (1)
  {
    /* Suspend systick interrupt */
    HAL_SuspendTick();
    
    /* Enter STOP1 mode */
    HAL_PWREx_EnterSTOP1Mode(PWR_STOPENTRY_WFI);
    
    /* Resume systick interrupt */
    HAL_ResumeTick();
    
    /* Set RTC alarm */
    APP_RtcSetAlarm();
  }
}

/**
  * @brief  RTC initialization function, sets RTC to January 1, 2022, Saturday, 00:00:00
  * @param  None
  * @retval None
  */
static void APP_RtcInit(void)
{
  RTC_TimeTypeDef Timeinit = {0};
  RCC_PeriphCLKInitTypeDef RTCLCKconfig = {0};
  
  /* Enable access to the backup domain (RTC settings are stored in the backup domain) */
  HAL_PWR_EnableBkUpAccess();
  
  /*Enable RTC clock*/
  __HAL_RCC_RTC_ENABLE();                               /* Enable RTC clock */
  
  /* RCC peripheral clock initialization */
  RTCLCKconfig.PeriphClockSelection = RCC_PERIPHCLK_RTC;/* RCC peripheral clock selection as RTC */
  RTCLCKconfig.RtcClockSelection = RCC_RTCCLKSOURCE_LSI;/* RTC source selection as LSI */
  HAL_RCCEx_PeriphCLKConfig(&RTCLCKconfig);

  /* RTC initialization */
  RTCinit.Instance = RTC;                               /* Select RTC */
  RTCinit.Init.AsynchPrediv = RTC_AUTO_1_SECOND;        /* Automatic calculation of RTC's 1-second time base */
  RTCinit.Init.OutPut = RTC_OUTPUTSOURCE_NONE;          /* No output on the TAMPER pin */
  /*2022-1-1-00:00:00*/
  RTCinit.DateToUpdate.Year = 22;                       /* Year 22 */
  RTCinit.DateToUpdate.Month = RTC_MONTH_JANUARY;       /* January  */
  RTCinit.DateToUpdate.Date = 1;                        /* 1st day */
  RTCinit.DateToUpdate.WeekDay = RTC_WEEKDAY_SATURDAY;  /* Saturday  */
  Timeinit.Hours = 0;                                   /* 0 hours */
  Timeinit.Minutes = 0;                                 /* 0 minutes */
  Timeinit.Seconds = 0;                                 /* 0 seconds */
  
  /* RTC deinitialization */
  HAL_RTC_DeInit(&RTCinit);
  
  /* RTC initialization */
  HAL_RTC_Init(&RTCinit);
  
  /* Set RTC current time in binary format */
  HAL_RTC_SetTime(&RTCinit, &Timeinit, RTC_FORMAT_BIN);
}

/**
  * @brief  Set RTC alarm
  * @param  None
  * @retval None
  */
static void APP_RtcSetAlarm(void)
{
  uint32_t countAlarm = 0;
  
  /* Get current alarm time in binary format */
  HAL_RTC_GetAlarm(&RTCinit, &RTC_AlarmStruct, RTC_FORMAT_BIN);
  
  /* Update alarm time in binary format */
  countAlarm = RTC_AlarmStruct.AlarmTime.Hours * 60 * 60 + \
               RTC_AlarmStruct.AlarmTime.Minutes * 60 + \
               RTC_AlarmStruct.AlarmTime.Seconds;
  if ((countAlarm + 1) % RTC_24H_TO_SEC == 0)
  {
    RTC_AlarmStruct.AlarmTime.Hours = 0;
    RTC_AlarmStruct.AlarmTime.Minutes = 0;
    RTC_AlarmStruct.AlarmTime.Seconds = 0;
  }
  else 
  {
    RTC_AlarmStruct.AlarmTime.Seconds += 1;
  }
  HAL_RTC_SetAlarm_IT(&RTCinit, &RTC_AlarmStruct, RTC_FORMAT_BIN);
}

/**
  * @brief  RTC alarm event callback function, LED turns on when exiting low-power mode
  * @param  hrtc: RTC handle
  * @retval None
  */
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
  /* Toggle LED */
  BSP_LED_Toggle(LED_GREEN);
  
  /* Print the current alarm time */
  printf("%02d:%02d:%02d\r\n", RTC_AlarmStruct.AlarmTime.Hours , RTC_AlarmStruct.AlarmTime.Minutes, RTC_AlarmStruct.AlarmTime.Seconds);
}

/**
  * @brief  System Clock Configuration
  * @param  None
  * @retval None
  */
static void APP_SystemClockConfig(void)
{
  RCC_OscInitTypeDef  OscInitstruct = {0};
  RCC_ClkInitTypeDef  ClkInitstruct = {0};
  
  OscInitstruct.OscillatorType      = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSE | 
                                      RCC_OSCILLATORTYPE_LSI;
  OscInitstruct.HSIState            = RCC_HSI_ON;                               /* Enable HSI */
  OscInitstruct.HSIDiv              = RCC_HSI_DIV1;                             /* HSI 1 frequency division */
  OscInitstruct.HSICalibrationValue = RCC_HSICALIBRATION_8MHz;                  /* Configure HSI clock 8MHz */
  OscInitstruct.HSEState            = RCC_HSE_OFF;                              /* Close HSE */
/* OscInitstruct.HSEFreq             = RCC_HSE_24_32MHz; */                     /* Choose HSE frequency of 24-32MHz */
  OscInitstruct.LSEState            = RCC_LSE_OFF;                              /* Close LSE */
/* OscInitstruct.LSEDriver           = RCC_LSEDRIVE_HIGH; */                    /* Drive capability level: high */
  OscInitstruct.LSIState            = RCC_LSI_ON;                               /* Enable LSI */
  OscInitstruct.PLL.PLLState        = RCC_PLL_OFF;                              /* Close PLL */
/* OscInitstruct.PLL.PLLSource       = RCC_PLLSOURCE_HSI; */                    /* PLL clock source selection HSI */
/* OscInitstruct.PLL.PLLMUL          = RCC_PLL_MUL16; */                        /* PLL clock source 16-fold frequency */
  /* Configure oscillator */
  if(HAL_RCC_OscConfig(&OscInitstruct) != HAL_OK)
  {
    APP_ErrorHandler();
  }
  
  ClkInitstruct.ClockType       = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  ClkInitstruct.SYSCLKSource    = RCC_SYSCLKSOURCE_HSISYS;              /* System clock selection HSISYS */
  ClkInitstruct.AHBCLKDivider   = RCC_SYSCLK_DIV1;                      /* AHB clock 1 division */
  ClkInitstruct.APB1CLKDivider  = RCC_HCLK_DIV1;                        /* APB1 clock 1 division */
  ClkInitstruct.APB2CLKDivider  = RCC_HCLK_DIV2;                        /* APB2 clock 2 division */
  /* Configure Clock */
  if(HAL_RCC_ClockConfig(&ClkInitstruct, FLASH_LATENCY_0) != HAL_OK)
  {
    APP_ErrorHandler();
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void APP_ErrorHandler(void)
{
  /* Infinite loop */
  while (1)
  {
  }
}

#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 can add his own implementation to report the file name and line number,
     for example: printf("Wrong parameters value: file %s on line %d\r\n", file, line)  */
  /* Infinite loop */
  while (1)
  {
  }
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
