/**
  ******************************************************************************
  * @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 RtcHandle;
PWR_StopModeConfigTypeDef PwrStopModeConf = {0};

/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockConfig(void);

/**
  * @brief  Main program.
  * @retval int
  */
int main(void)
{
  /* Reset of all peripherals, Initializes the Systick */
  HAL_Init();
  
   /* System clock configuration */
  APP_SystemClockConfig();
  
  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* Initialize button */
  BSP_PB_Init(BUTTON_KEY,BUTTON_MODE_GPIO);
  
  /* RTC initialization */
  RtcHandle.Instance = RTC;                         /* Select RTC */
  RtcHandle.Init.AsynchPrediv = RTC_AUTO_1_SECOND;  /* RTC asynchronous prescaler calculated automatically for one second time base */
  RtcHandle.Init.OutPut = RTC_OUTPUTSOURCE_NONE;    /* No output on the TAMPER pin */
  if (HAL_RTC_Init(&RtcHandle) != HAL_OK)
  {
  }
  
  /* Turn on the LED */
  BSP_LED_On(LED_GREEN);
  
  /* Wait for the user button to be pressed to start the main program */
  while (BSP_PB_GetState(BUTTON_KEY) == 1)
  {
  }
  
  /* Turn off the LED */
  BSP_LED_Off(LED_GREEN);
  
  /* Suspend the SysTick interrupt to prevent interrupt waking up the system */
  HAL_SuspendTick();

  /* VCORE = 1.0V  when enter stop mode */
  PwrStopModeConf.LPVoltSelection       =  PWR_STOPMOD_LPR_VOLT_SCALE2;
  PwrStopModeConf.FlashDelay            =  PWR_WAKEUP_FLASH_DELAY_5US;
  PwrStopModeConf.WakeUpHsiEnableTime   =  PWR_WAKEUP_HSIEN_AFTER_MR;
  PwrStopModeConf.RegulatorSwitchDelay  =  PWR_WAKEUP_LPR_TO_MR_DELAY_2US;
  PwrStopModeConf.SramRetentionVolt     =  PWR_SRAM_RETENTION_VOLT_VOS;
  HAL_PWR_ConfigStopMode(&PwrStopModeConf);
  
  /* Enter STOP mode */
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
  
  /* Resume the SysTick interrupt */
  HAL_ResumeTick();
  
  while (1)
  {
    BSP_LED_Toggle(LED_GREEN);
    HAL_Delay(500);
  }
}

/**
  * @brief  System clock configuration function
  * @param  None
  * @retval None
  */
static void APP_SystemClockConfig(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /* Oscillator configuration */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSI; /* Select oscillators HSI, LSI */
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;                          /* Enable HSI */
  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;                          /* HSI not divided */
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_8MHz;  /* Configure HSI clock as 8MHz */
  RCC_OscInitStruct.LSIState = RCC_LSI_OFF;                         /* Disable LSI */
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;                     /* Disable PLL */
  /*RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;*/          /* Select HSI as PLL source */
  /* Configure oscillators */
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  /* Clock source configuration */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1; /* Select clock types HCLK, SYSCLK, PCLK1 */
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; /* Select HSI as system clock */
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;     /* AHB  clock not divided */
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;      /* APB  clock not divided */
  /* Configure clock source */
  if (HAL_RCC_ClockConfig(&RCC_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)
{
  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******************/
