/**
  ******************************************************************************
  * @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_ExtiConfig(void);
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);
  
  /* Turn on the LED */
  BSP_LED_On(LED_GREEN);

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

  /* Initialize debug USART (used for printf) */
  BSP_USART_Config();
  
  APP_ExtiConfig();

  /*Wait for the button to be pressed*/
  while(BSP_PB_GetState(BUTTON_KEY) == 1);
  
  /* Turn off the LED */
  BSP_LED_Off(LED_GREEN);
  
  /* Disable SYSTICK interrupt to prevent SYSTICK from waking up */
  HAL_SuspendTick();

  /* Low power STOP voltage 0.8V */
  HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE4);
  
  /* Enter STOP mode */
  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON,PWR_STOPENTRY_WFI);
  
  /* Resume the SysTick interrupt */
  HAL_ResumeTick();
  
  /* Infinite loop */
  while (1)
  {
    /* Toggle the LED to make it blink */
    BSP_LED_Toggle(LED_GREEN);
    HAL_Delay(500);
  }  
}

/**
  * @brief  Interrupt configuration function
  * @param  None
  * @retval None
  */
static void APP_ExtiConfig(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct = {0};

  __HAL_RCC_GPIOA_CLK_ENABLE();                  /* Enable GPIOA clock */

  GPIO_InitStruct.Mode  = GPIO_MODE_IT_FALLING;  /* GPIO mode: Falling edge interrupt */
  GPIO_InitStruct.Pull  = GPIO_PULLUP;           /* Pull-up */
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;  /* High-speed */
  GPIO_InitStruct.Pin = GPIO_PIN_6;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  HAL_NVIC_EnableIRQ(EXTI9_5_IRQn);              /* Enable EXTI interrupt */
  HAL_NVIC_SetPriority(EXTI9_5_IRQn, 0, 0);      /* Configure interrupt priority */
}

/**
  * @brief  System clock configuration function
  * @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 | RCC_OSCILLATORTYPE_HSI48M;
  OscInitstruct.HSEState        = RCC_HSE_OFF;                              /* Disable HSE */
/* OscInitstruct.HSEFreq         = RCC_HSE_16_32MHz; */                     /* HSE working frequency range: 16M~32M */
  OscInitstruct.HSI48MState     = RCC_HSI48M_OFF;                           /* Disable HSI48M */
  OscInitstruct.HSIState        = RCC_HSI_ON;                               /* Enable HSI */
  OscInitstruct.LSEState        = RCC_LSE_OFF;                              /* Disable LSE */
/* OscInitstruct.LSEDriver       = RCC_LSEDRIVE_HIGH; */                    /* Drive capability level: High */
  OscInitstruct.LSIState        = RCC_LSI_OFF;                              /* Disable LSI */
  OscInitstruct.PLL.PLLState    = RCC_PLL_OFF;                              /* Disable PLL */
/*  OscInitstruct.PLL.PLLSource   = RCC_PLLSOURCE_HSE; */                   /* PLL clock source: HSE */
/*  OscInitstruct.PLL.PLLMUL      = RCC_PLL_MUL6; */                        /* PLL multiplication factor: 6 */
  /* Configure Oscillators */
  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_HSI;                 /* System clock source: HSI */
  ClkInitstruct.AHBCLKDivider   = RCC_SYSCLK_DIV1;                      /* AHB clock not divided */
  ClkInitstruct.APB1CLKDivider  = RCC_HCLK_DIV1;                        /* APB1 clock not divided */
  ClkInitstruct.APB2CLKDivider  = RCC_HCLK_DIV2;                        /* APB2 clock divided by 2 */
  /* Configure Clocks */
  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******************/