159 lines
5.0 KiB
C
159 lines
5.0 KiB
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 STM32F1xx UTILS LL API.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© 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 STM32F1xx_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 64MHz:
|
|
Syst freq = ((HSI_VALUE / LL_RCC_PLLSOURCE_HSI_DIV_2) * LL_RCC_PLL_MUL_16)
|
|
((8MHz /2) * 16) = 64MHz */
|
|
LL_UTILS_PLLInitTypeDef sUTILS_PLLInitStruct = {LL_RCC_PLL_MUL_16, LL_RCC_PREDIV_DIV_1};
|
|
|
|
/* Variable to store AHB and APB buses clock configuration */
|
|
/* Settings to have HCLK set to 64MHz, APB1 to 32MHz and APB2 to 64MHz */
|
|
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_2);
|
|
|
|
/* 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_APB2_GRP1_EnableClock(LL_APB2_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);
|
|
|
|
/* Select MCO clock source and prescaler */
|
|
LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_SYSCLK);
|
|
}
|
|
|
|
#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****/
|