/**
  ******************************************************************************
  * @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 "py32f032xx_ll_Start_Kit.h"

/* Private define ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
LL_UTILS_PLLInitTypeDef UTILS_PLLInitStruct = {LL_RCC_PLL_MUL9,LL_RCC_PLL_DIV1};
LL_UTILS_ClkInitTypeDef sUTILS_ClkInitStruct = {LL_RCC_SYSCLK_DIV_1, LL_RCC_APB1_DIV_1};

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

/**
  * @brief  Main program.
  * @param  None
  * @retval int
  */
int main(void)
{
  /* Enable SYSCFG and PWR clock */
  LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_SYSCFG);
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);

  /* Configure system clock */
  APP_SystemClockConfig();

  /* Configure the system clock to PLL with HSI as the clock source*/
  /* System clock = 8MHz * 9 = 72MHz, HCLK = 72MHz, PCLK = 72MHz */
  LL_PLL_ConfigSystemClock_HSI(&UTILS_PLLInitStruct,&sUTILS_ClkInitStruct);

  /* Reconfigure SysTick 1ms timer to adapt to the new system clock frequency */
  LL_Init1msTick(SystemCoreClock);

  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);

  /* Configure MCO pin */
  APP_McoConfigGpio();

  /* Configure MCO clock source and division ratio */
  LL_RCC_ConfigMCO(LL_RCC_MCOSOURCE_SYSCLK, LL_RCC_MCO_DIV_1);

  while (1)
  {
    BSP_LED_Toggle(LED_GREEN);
    LL_mDelay(1000);
  }
}

/**
  * @brief  Configure PA8 as MCO alternate function
  * @param  None
  * @retval None
  */
static void APP_McoConfigGpio(void)
{
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  /* Enable GPIOA clock */
  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
  
  /* Configure PA8 as alternate function and set it as MCO output pin */  
  /* Select pin 8 */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_8; 
  /* Set mode as alternate function */
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE; 
  /* Select alternate function 5 (AF5) */
  GPIO_InitStruct.Alternate = LL_GPIO_AF5_MCO;     
  /* Set output speed as very high frequency */
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;   
  /* Set output type as push-pull */
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  /* Set no pull-up/pull-down */
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;                
  
  /* Initialize GPIOA */
  LL_GPIO_Init(GPIOA,&GPIO_InitStruct);
}

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

  /* Set APB prescaler: PCLK = HCLK */
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_Init1msTick(8000000);

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

/**
  * @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******************/
