/**
  ******************************************************************************
  * @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"
#include "py32f403xx_ll_Start_Kit.h"

/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockConfig(void);
static void APP_ExtiConfig(void);
static void APP_PvdConfig(void);

/**
  * @brief  Main program.
  * @param  None
  * @retval int
  */
int main(void)
{
  /* Enable SYSCFG and PWR clock */
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SYSCFG);
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
  
  /* 3 bits for pre-emption priority, 0 bits for subpriority */
  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_3);

  /* Configure system clock */
  APP_SystemClockConfig();

  /* Enable LSI */
  LL_RCC_LSI_Enable();
  
  /* Wait For LSI Ready */
  while (LL_RCC_LSI_IsReady() == 0U) {;}

  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* EXTI Config */
  APP_ExtiConfig();

  /* PVD Config */
  APP_PvdConfig();
  
  /* Enable PVD */
  LL_PWR_EnablePVD();

  while (1)
  {

  }
}

/**
  * @brief  PVD interrupt callback
  * @param  None
  * @retval None
  */
void APP_PvdCallback(void)
{
  if (LL_PWR_IsActiveFlag_PVDO())
  {
    BSP_LED_On(LED_GREEN);
  }
  else
  {
    BSP_LED_Off(LED_GREEN);
  }
}

/**
  * @brief  Configure EXTI
  * @param  None
  * @retval None
  */
static void APP_ExtiConfig(void)
{
  LL_EXTI_InitTypeDef EXTI_InitStruct = {0};

  /* Select EXTI16 */
  EXTI_InitStruct.Line = LL_EXTI_LINE_16;
  
  /* Enable */
  EXTI_InitStruct.LineCommand = ENABLE;
  
  /* Select interrupt mode */
  EXTI_InitStruct.Mode = LL_EXTI_MODE_IT;
  
  /* Select rising/falling edge trigger */
  EXTI_InitStruct.Trigger = LL_EXTI_TRIGGER_RISING_FALLING;
  
  /* Initialize external interrupt */
  LL_EXTI_Init(&EXTI_InitStruct);
}

/**
  * @brief  Configure PVD
  * @param  None
  * @retval None
  */
static void APP_PvdConfig(void)
{
  /* Enable PWR clock */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
  
  /* Set PVD Level 3.0V */
  LL_PWR_SetPVDLevel(LL_PWR_PVDLEVEL_6);
  
  /* Disable filtering function */
  LL_PWR_DisablePVDFilter();

  LL_PWR_SetPVDFilter(LL_PWR_PVD_FILTER_1CLOCK);
  
  /* Set interrupt priority */
  NVIC_SetPriority(PVD_IRQn, 1);
  
  /* Enable PVD interrupt */
  NVIC_EnableIRQ(PVD_IRQn);
}

/**
  * @brief  Configure system clock
  * @param  None
  * @retval None
  */
static void APP_SystemClockConfig(void)
{
  /* Enable HSI */
  LL_RCC_HSI_Enable();
  while(LL_RCC_HSI_IsReady() != 1)
  {
  }

  /* Set AHB prescaler: HCLK = SYSCLK */
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);

  /* Select HSI as system clock source */
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI)
  {
  }

  /* Set APB1 & APB2 prescaler: PCLK1 = HCLK, PCLK2 = HCLK/2 */
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_2);
  
  /* Set systick to 1ms in using frequency set to 8MHz */
  LL_Init1msTick(8000000);

  /* Update the SystemCoreClock global variable(which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(8000000);
}

/**
  * @brief  Error handling function
  * @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,
     ex: 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******************/