/**
  ******************************************************************************
  * @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_SystemClockConfig(void);
static void APP_IwdgConfig(void);

/**
  * @brief  Main program.
  * @retval int
  */
int main(void)
{
  /* Enable SYSCFG and PWR clocks */
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);

  /* Configure system clock */
  APP_SystemClockConfig();

  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* Configure IWDG */
  APP_IwdgConfig();

  while (1)
  {
    LL_mDelay(900);                               /* Feed the dog every 900ms, the system can run normally */
    /* LL_mDelay(1100); */                        /* Feed the dog every 1.1s, the system will not run properly */

    /* Toggle LED */
    BSP_LED_Toggle(LED_GREEN);                

    /* Feed the watchdog */
    LL_IWDG_ReloadCounter(IWDG);
  }
}

/**
  * @brief  Configure IWDG
  * @param  None
  * @retval None
  */
static void APP_IwdgConfig(void)
{
  /* Enable LSI */
  LL_RCC_LSI_Enable();
  while (LL_RCC_LSI_IsReady() == 0U) {;}

  /* Enable IWDG */
  LL_IWDG_Enable(IWDG);
  
  /* Enable write access */
  LL_IWDG_EnableWriteAccess(IWDG);
 
  /* Set IWDG prescaler */
  LL_IWDG_SetPrescaler(IWDG, LL_IWDG_PRESCALER_32);
  
  /* Set watchdog reload counter */
  LL_IWDG_SetReloadCounter(IWDG, 1024); /* T*1024=1s */
 
  /* IWDG initialization*/
  while (LL_IWDG_IsReady(IWDG) == 0U) {;}
 
  /* Feed the watchdog */
  LL_IWDG_ReloadCounter(IWDG);
}

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

  /* Set AHB prescaler */
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);

  /* Configure HSISYS as system clock source */
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSISYS);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSISYS)
  {
  }

  /* Set APB1 prescaler*/
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_Init1msTick(8000000);

  /* Update system clock global variable SystemCoreClock (can also be updated by calling SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(8000000);
}

/**
  * @brief  Error executing function.
  * @param  None
  * @retval None
  */
void APP_ErrorHandler(void)
{
  BSP_LED_Off(LED_GREEN);           /* Turn off LED */
  
  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******************/
