/**
  ******************************************************************************
  * @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 ---------------------------------------------------------*/
LPTIM_HandleTypeDef       hlptim1;
EXTI_HandleTypeDef        ExtiHandle;
EXTI_ConfigTypeDef        ExtiCfg;
RCC_PeriphCLKInitTypeDef  PeriphClkInit = {0};
RCC_OscInitTypeDef        OSCINIT = {0};

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

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

  /* Turn on LED */
  BSP_LED_On(LED_GREEN);
  
  /* Wait for button press */
  while(BSP_PB_GetState(BUTTON_KEY) == 0);

  /* Turn off LED */
  BSP_LED_Off(LED_GREEN);

  APP_LptimInit();

  /* LSI clock configuration */
  OSCINIT.OscillatorType = RCC_OSCILLATORTYPE_LSI;  /* Set the oscillator type to LSI */
  OSCINIT.LSIState = RCC_LSI_ON;                    /* Enable LSI */
  OSCINIT.PLL.PLLState = RCC_PLL_NONE;              /* PLL No Change */
  /* Clock initialization */
  if (HAL_RCC_OscConfig(&OSCINIT) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
  PeriphClkInit.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  /* Configure EXTI Line as event wakeup mode for LPTIM */
  ExtiCfg.Line = EXTI_LINE_27;
  ExtiCfg.Mode = EXTI_MODE_EVENT;
  HAL_EXTI_SetConfigLine(&ExtiHandle, &ExtiCfg);

  /* Configure LPTIM for continuous mode and enable interrupt */
  HAL_LPTIM_Counter_Start_IT(&hlptim1, 51-1);
  
  while(1)
  {
    /* Suspend SysTick interrupt */
    HAL_SuspendTick();
  
    HAL_PWREx_SetWakeupFlashDelay(PWR_WAKEUP_FLASH_DELAY_5US);

    /* Entering STOP0 mode */
    HAL_PWREx_EnterSTOP0Mode(PWR_DEEPLOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFE);

    HAL_ResumeTick();
    
    /* The Autoreload match flag must be cleared before entering stop mode the next time */
    if(__HAL_LPTIM_GET_FLAG(&hlptim1, LPTIM_FLAG_ARRM) != RESET)
    {    
      __HAL_LPTIM_CLEAR_FLAG(&hlptim1, LPTIM_FLAG_ARRM);
    }
    
    BSP_LED_Toggle(LED_GREEN);
  }
}

/**
  * @brief LPTIM1 Initialization Function
  * @param None
  * @retval None
  */
static void APP_LptimInit(void)
{
  hlptim1.Instance = LPTIM1;
  hlptim1.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
  hlptim1.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
  hlptim1.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
  hlptim1.Init.Trigger.ActiveEdge = LPTIM_ACTIVEEDGE_RISING;
  hlptim1.Init.Trigger.SampleTime = LPTIM_TRIGSAMPLETIME_DIRECTTRANSITION;
  hlptim1.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
  hlptim1.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
  hlptim1.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
  hlptim1.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
  if (HAL_LPTIM_Init(&hlptim1) != HAL_OK)
  {
    APP_ErrorHandler();
  }
}

/**
  * @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 | RCC_OSCILLATORTYPE_MSI; /* Select oscillator HSI, LSI, MSI */
#if defined(RCC_HSE_SUPPORT)
  RCC_OscInitStruct.OscillatorType |= RCC_OSCILLATORTYPE_HSE; /* Select oscillator HSE */
#endif /* RCC_HSE_SUPPORT */
#if defined(RCC_LSE_SUPPORT)
  RCC_OscInitStruct.OscillatorType |= RCC_OSCILLATORTYPE_LSE; /* Select oscillator LSE */
#endif /* RCC_LSE_SUPPORT */
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;                          /* Enable HSI */
  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;                          /* HSI 1 frequency division */
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_8MHz;  /* Configure HSI clock 8MHz */
#if defined(RCC_HSE_SUPPORT)
  RCC_OscInitStruct.HSEState = RCC_HSE_OFF;                         /* Close HSE */
  /*RCC_OscInitStruct.HSEFreq = RCC_HSE_24_32MHz;*/
#endif /* RCC_HSE_SUPPORT */
  RCC_OscInitStruct.LSIState = RCC_LSI_OFF;                         /* Close LSI */
#if defined(RCC_LSE_SUPPORT)
  RCC_OscInitStruct.LSEState = RCC_LSE_OFF;                         /* Close LSE */
  /*RCC_OscInitStruct.LSEDriver = RCC_LSEDRIVE_MEDIUM;*/
#endif /* RCC_LSE_SUPPORT */
  RCC_OscInitStruct.MSIState = RCC_MSI_OFF;                         /* Close MSI */
  /*RCC_OscInitStruct.MSIDiv = RCC_MSI_DIV1;*/
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;                     /* Close PLL */
  /*RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;*/
  /*RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;*/
  /* Configure oscillator */
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  /* Clock source configuration */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK; /* Choose to configure clock HCLK, SYSCLK, PCLK */
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSISYS; /* Select HSISYS as the system clock */
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;        /* AHB clock 1 division */
  RCC_ClkInitStruct.APBCLKDivider = RCC_HCLK_DIV1;          /* APB clock 1 division */
  /* Configure clock source */
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    APP_ErrorHandler();
  }
}

/**
  * @brief  Error executing function.
  * @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)
{
  /* Users can add their own printing information as needed,
     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******************/
