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/**
******************************************************************************
* @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
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* 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
/**
* @}
*/
/**
* @}
*/
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