/**
  ******************************************************************************
  * @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 ---------------------------------------------------------*/
/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockDecrease(void);
static void APP_SystemClockConfig(void);
/**
  * @brief  Main program.
  * @retval int
  */
int main(void)
{
  /* Reset of all peripherals, Initializes the Systick. */
  HAL_Init();
  
  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* Initialize button */
  BSP_PB_Init(BUTTON_KEY,BUTTON_MODE_GPIO);
  
  /* Turn on the LED */
  BSP_LED_On(LED_GREEN);
  
  /* Configure the System clock as MSISYS */
  APP_SystemClockDecrease(); 
  
  /* Enter LP RUN Mode */
  HAL_PWREx_EnableLowPowerRunMode();

  /* LED off */
  BSP_LED_Off(LED_GREEN);
  
  /* Wait for button press */
  while(BSP_PB_GetState(BUTTON_KEY) == 0);
  
  /* Disable low power run mode */
  HAL_PWREx_DisableLowPowerRunMode();
  
  /* System clock configuration */
  APP_SystemClockConfig(); 
  
  /* Infinite loop */
  while (1)
  {
    /* LED blinking */
    BSP_LED_Toggle(LED_GREEN);
    HAL_Delay(500);
  }
}

/**
  * @brief  System clock Speed Decrease
  * @param  None
  * @retval None
  */
static void APP_SystemClockDecrease(void)
{
  RCC_OscInitTypeDef OscInitstruct = {0};
  RCC_ClkInitTypeDef ClkInitstruct = {0};

  /* Oscillator configuration */
  OscInitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; /* Select oscillator HSI */
  OscInitstruct.HSIState        = RCC_HSI_ON;                               /* Enable HSI */
  OscInitstruct.HSICalibrationValue = RCC_HSICALIBRATION_8MHz;              /* Configure HSI clock 8MHz */
  OscInitstruct.PLL.PLLState    = RCC_PLL_OFF;                              /* Close PLL */
/* OscInitstruct.PLL.PLLSource   = RCC_PLLSOURCE_HSI; */                    /* PLL clock source selection HSI */
/* OscInitstruct.PLL.PLLMUL      = 2; */                                    /* PLL clock source 2-fold frequency */
  /* Configure oscillator */
  if (HAL_RCC_OscConfig(&OscInitstruct) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  /* Clock source configuration */
  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_DIV4;                      /* AHB clock 4 division */
  ClkInitstruct.APB1CLKDivider  = RCC_HCLK_DIV1;                        /* APB1 clock 1 division */
  ClkInitstruct.APB2CLKDivider  = RCC_HCLK_DIV1;                        /* APB2 clock 1 division */
  /* Configure clock source */
  if (HAL_RCC_ClockConfig(&ClkInitstruct, FLASH_LATENCY_0) != HAL_OK)
  {
    APP_ErrorHandler();
  }
}

/**
  * @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_OFF;                              /* Close 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******************/
