/p1/workspace/STM32Cube_FW_F4_V1.19.0/Projects/STM32F411RE-Nucleo/Examples_LL/UTILS/UTILS_ConfigureSystemClock/Src/main.c

/**

  ******************************************************************************

  * @file    Examples_LL/UTILS/UTILS_ConfigureSystemClock/Src/main.c

  * @author  MCD Application Team

  * @brief   This example describes how to configure system clock using PLL with 

  *          HSI as source clock through the STM32F4xx UTILS LL API.

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>

  *

  * Redistribution and use in source and binary forms, with or without modification,

  * are permitted provided that the following conditions are met:

  *   1. Redistributions of source code must retain the above copyright notice,

  *      this list of conditions and the following disclaimer.

  *   2. Redistributions in binary form must reproduce the above copyright notice,

  *      this list of conditions and the following disclaimer in the documentation

  *      and/or other materials provided with the distribution.

  *   3. Neither the name of STMicroelectronics nor the names of its contributors

  *      may be used to endorse or promote products derived from this software

  *      without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  *

  ******************************************************************************

  */



/* Includes ------------------------------------------------------------------*/

#include "main.h"



/** @addtogroup STM32F4xx_LL_Examples

  * @{

  */



/** @addtogroup UTILS_ConfigureSystemClock

  * @{

  */



/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Variable to store PLL parameters */

/* Configuration will allow to reach a SYSCLK frequency set to 100MHz: 

   Syst freq = ((HSI_VALUE / PLLM) * PLLN)/ PLLR)

               ((16MHz /8) * 200)/ 4)             = 100MHz             */

LL_UTILS_PLLInitTypeDef sUTILS_PLLInitStruct = {LL_RCC_PLLM_DIV_8, 200, LL_RCC_PLLP_DIV_4};



/* Variable to store AHB and APB buses clock configuration */

/* Settings to have HCLK set to 100MHz, APB1 to 54MHz and APB2 to 100MHz */

LL_UTILS_ClkInitTypeDef sUTILS_ClkInitStruct = {LL_RCC_SYSCLK_DIV_1, LL_RCC_APB1_DIV_2, LL_RCC_APB2_DIV_1};



/* Private function prototypes -----------------------------------------------*/

void     LED_Init(void);

void     MCO_ConfigGPIO(void);



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



/**

  * @brief  Main program

  * @param  None

  * @retval None

  */

int main(void)

{

  /* System started with default clock used after reset */

  /* Set FLASH latency */

  LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);



  /* Switch to PLL with HSI as clock source             */

  LL_PLL_ConfigSystemClock_HSI(&sUTILS_PLLInitStruct, &sUTILS_ClkInitStruct);

  

  /* 

     CMSIS variable automatically updated according to new configuration.

     SystemCoreClock should be equal to calculated HCLK frequency.

     FLASH latency is also tuned according to system constraints described 

     in the reference manual.           

  */



  /* Set Systick to 1ms in using frequency set to SystemCoreClock */

  LL_Init1msTick(SystemCoreClock);



  /* Initialize LED2 */

  LED_Init();



  /* Configure SYSCLK for MCO */

  MCO_ConfigGPIO();



  /* Toggle LED2 in an infinite loop with a period of 1Hz */

  while (1)

  {

    LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);  

    LL_mDelay(1000);

  }

}



/**

  * @brief  Initialize LED2.

  * @param  None

  * @retval None

  */

void LED_Init(void)

{

  /* Enable the LED2 Clock */

  LED2_GPIO_CLK_ENABLE();



  /* Configure IO in output push-pull mode to drive external LED2 */

  LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);

  /* Reset value is LL_GPIO_OUTPUT_PUSHPULL */

  //LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);

  /* Reset value is LL_GPIO_SPEED_FREQ_LOW */

  //LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);

  /* Reset value is LL_GPIO_PULL_NO */

  //LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);

}



/**

  * @brief  Configure MCO pin (PA8).

  * @param  None

  * @retval None

  */

void MCO_ConfigGPIO(void)

{

  /* MCO Clock Enable */

  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);



  /* Configure the MCO pin in alternate function mode */

  LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);

  LL_GPIO_SetPinOutputType(GPIOA, LL_GPIO_PIN_8, LL_GPIO_OUTPUT_PUSHPULL);

  LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_8, LL_GPIO_SPEED_FREQ_HIGH);

  LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_8, LL_GPIO_PULL_NO);

  LL_GPIO_SetAFPin_8_15(GPIOA, LL_GPIO_PIN_8, LL_GPIO_AF_0);

  

  /* Select MCO clock source and prescaler */

  LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_PLLCLK, LL_RCC_MCO1_DIV_4);

}



#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****/