/**
  ******************************************************************************
  * @file    Examples_LL/GPIO/GPIO_InfiniteLedToggling_Init/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to configure and use GPIOs through
  *          the STM32F3xx  GPIO LL API.
  *          Peripheral initialization done using LL initialization function.
  ******************************************************************************
  * @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"

/** @addtogroup STM32F3xx_LL_Examples
  * @{
  */

/** @addtogroup GPIO_InfiniteLedToggling_Init
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
LL_GPIO_InitTypeDef gpio_initstruct;

/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
void     SystemClock_Config(void);
void     Configure_GPIO(void);


/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* Configure the system clock to 64 MHz */
  SystemClock_Config();
  
  /* -2- Configure IO in output push-pull mode to drive external LED */
  Configure_GPIO();

  /* Toggle IO in an infinite loop */
  while (1)
  {
    LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
    
    /* Insert delay 250 ms */
    LL_mDelay(250);
  }
}

/**
  * @brief  This function configures GPIO
  * @note   Peripheral configuration is minimal configuration from reset values.
  *         Thus, some useless LL unitary functions calls below are provided as
  *         commented examples - setting is default configuration from reset.
  * @param  None
  * @retval None
  */
void Configure_GPIO(void)
{
  /* Enable the LED2 Clock */
  LED2_GPIO_CLK_ENABLE();

  /* Configure IO in output push-pull mode to drive external LED2 */
  gpio_initstruct.Pin        = LED2_PIN;
  gpio_initstruct.Mode       = LL_GPIO_MODE_OUTPUT;
  gpio_initstruct.Speed      = LL_GPIO_SPEED_FREQ_LOW;
  gpio_initstruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  gpio_initstruct.Pull       = LL_GPIO_PULL_NO;

  /* Initialize LED2_GPIO_PORT port according to parameters defined in initialization structure. */
  if (LL_GPIO_Init(LED2_GPIO_PORT, &gpio_initstruct) != SUCCESS)
  {
    /* Initialization Error */
    while (1)
    {
    }
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSI)
  *            SYSCLK(Hz)                     = 64000000
  *            HCLK(Hz)                       = 64000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 2
  *            APB2 Prescaler                 = 1
  *            PLLMUL                         = 16
  *            Flash Latency(WS)              = 2
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  /* Set FLASH latency */ 
  LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);

  /* Enable HSI if not already activated*/
  if (LL_RCC_HSI_IsReady() == 0)
  {
    /* Enable HSI and wait for activation*/
    LL_RCC_HSI_Enable(); 
    while(LL_RCC_HSI_IsReady() != 1)
    {
    };
  }

  /* Main PLL configuration and activation */
  LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI_DIV_2, LL_RCC_PLL_MUL_16);
  
  LL_RCC_PLL_Enable();
  while(LL_RCC_PLL_IsReady() != 1) 
  {
  };
  
  /* Sysclk activation on the main PLL */
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
  {
  };
  
  /* Set APB1 & APB2 prescaler*/
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
  
  /* Set systick to 1ms in using frequency set to 64MHz */
  /* This frequency can be calculated through LL RCC macro */
  /* ex: __LL_RCC_CALC_PLLCLK_FREQ ((HSI_VALUE / 2), LL_RCC_PLL_MUL_16) */
  LL_Init1msTick(64000000);
  
  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(64000000);
}
#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", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
