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/**
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******************************************************************************
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* @file stm32f0xx_ll_utils.c
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* @author MCD Application Team
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* @brief UTILS LL module driver.
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f0xx_ll_rcc.h"
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#include "stm32f0xx_ll_utils.h"
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#include "stm32f0xx_ll_system.h"
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#ifdef USE_FULL_ASSERT
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#include "stm32_assert.h"
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#else
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#define assert_param(expr) ((void)0U)
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#endif
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/** @addtogroup STM32F0xx_LL_Driver
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* @{
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*/
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/** @addtogroup UTILS_LL
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* @{
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*/
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/* Private types -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private constants ---------------------------------------------------------*/
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/** @addtogroup UTILS_LL_Private_Constants
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* @{
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*/
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/* Defines used for PLL range */
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#define UTILS_PLL_OUTPUT_MIN 16000000U /*!< Frequency min for PLL output, in Hz */
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#define UTILS_PLL_OUTPUT_MAX 48000000U /*!< Frequency max for PLL output, in Hz */
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/* Defines used for HSE range */
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#define UTILS_HSE_FREQUENCY_MIN 4000000U /*!< Frequency min for HSE frequency, in Hz */
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#define UTILS_HSE_FREQUENCY_MAX 32000000U /*!< Frequency max for HSE frequency, in Hz */
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/* Defines used for FLASH latency according to SYSCLK Frequency */
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#define UTILS_LATENCY1_FREQ 24000000U /*!< SYSCLK frequency to set FLASH latency 1 */
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/**
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* @}
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*/
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/* Private macros ------------------------------------------------------------*/
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/** @addtogroup UTILS_LL_Private_Macros
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* @{
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*/
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#define IS_LL_UTILS_SYSCLK_DIV(__VALUE__) (((__VALUE__) == LL_RCC_SYSCLK_DIV_1) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_2) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_4) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_8) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_16) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_64) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_128) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_256) \
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|| ((__VALUE__) == LL_RCC_SYSCLK_DIV_512))
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#define IS_LL_UTILS_APB1_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB1_DIV_1) \
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|| ((__VALUE__) == LL_RCC_APB1_DIV_2) \
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|| ((__VALUE__) == LL_RCC_APB1_DIV_4) \
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|| ((__VALUE__) == LL_RCC_APB1_DIV_8) \
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|| ((__VALUE__) == LL_RCC_APB1_DIV_16))
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#define IS_LL_UTILS_PLLMUL_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLL_MUL_2) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_3) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_4) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_5) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_6) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_7) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_8) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_9) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_10) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_11) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_12) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_13) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_14) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_15) \
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|| ((__VALUE__) == LL_RCC_PLL_MUL_16))
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#define IS_LL_UTILS_PREDIV_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PREDIV_DIV_1) || ((__VALUE__) == LL_RCC_PREDIV_DIV_2) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_3) || ((__VALUE__) == LL_RCC_PREDIV_DIV_4) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_5) || ((__VALUE__) == LL_RCC_PREDIV_DIV_6) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_7) || ((__VALUE__) == LL_RCC_PREDIV_DIV_8) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_9) || ((__VALUE__) == LL_RCC_PREDIV_DIV_10) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_11) || ((__VALUE__) == LL_RCC_PREDIV_DIV_12) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_13) || ((__VALUE__) == LL_RCC_PREDIV_DIV_14) || \
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((__VALUE__) == LL_RCC_PREDIV_DIV_15) || ((__VALUE__) == LL_RCC_PREDIV_DIV_16))
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#define IS_LL_UTILS_PLL_FREQUENCY(__VALUE__) ((UTILS_PLL_OUTPUT_MIN <= (__VALUE__)) && ((__VALUE__) <= UTILS_PLL_OUTPUT_MAX))
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#define IS_LL_UTILS_HSE_BYPASS(__STATE__) (((__STATE__) == LL_UTILS_HSEBYPASS_ON) \
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|| ((__STATE__) == LL_UTILS_HSEBYPASS_OFF))
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#define IS_LL_UTILS_HSE_FREQUENCY(__FREQUENCY__) (((__FREQUENCY__) >= UTILS_HSE_FREQUENCY_MIN) && ((__FREQUENCY__) <= UTILS_HSE_FREQUENCY_MAX))
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/**
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* @}
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*/
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/* Private function prototypes -----------------------------------------------*/
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/** @defgroup UTILS_LL_Private_Functions UTILS Private functions
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* @{
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*/
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static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency,
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LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct);
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#if defined(FLASH_ACR_LATENCY)
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static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency);
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#endif /* FLASH_ACR_LATENCY */
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static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct);
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static ErrorStatus UTILS_PLL_IsBusy(void);
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/**
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* @}
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*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup UTILS_LL_Exported_Functions
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* @{
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*/
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/** @addtogroup UTILS_LL_EF_DELAY
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* @{
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*/
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/**
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* @brief This function configures the Cortex-M SysTick source to have 1ms time base.
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* @note When a RTOS is used, it is recommended to avoid changing the Systick
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* configuration by calling this function, for a delay use rather osDelay RTOS service.
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* @param HCLKFrequency HCLK frequency in Hz
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* @note HCLK frequency can be calculated thanks to RCC helper macro or function @ref LL_RCC_GetSystemClocksFreq
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* @retval None
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*/
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void LL_Init1msTick(uint32_t HCLKFrequency)
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{
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/* Use frequency provided in argument */
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LL_InitTick(HCLKFrequency, 1000U);
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}
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/**
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* @brief This function provides accurate delay (in milliseconds) based
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* on SysTick counter flag
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* @note When a RTOS is used, it is recommended to avoid using blocking delay
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* and use rather osDelay service.
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* @note To respect 1ms timebase, user should call @ref LL_Init1msTick function which
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* will configure Systick to 1ms
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* @param Delay specifies the delay time length, in milliseconds.
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* @retval None
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*/
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void LL_mDelay(uint32_t Delay)
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{
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__IO uint32_t tmp = SysTick->CTRL; /* Clear the COUNTFLAG first */
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/* Add this code to indicate that local variable is not used */
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((void)tmp);
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/* Add a period to guaranty minimum wait */
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if (Delay < LL_MAX_DELAY)
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{
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Delay++;
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}
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while (Delay)
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{
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if ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) != 0U)
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{
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Delay--;
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}
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}
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}
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/**
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* @}
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*/
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/** @addtogroup UTILS_EF_SYSTEM
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* @brief System Configuration functions
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*
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@verbatim
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===============================================================================
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##### System Configuration functions #####
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===============================================================================
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[..]
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System, AHB and APB buses clocks configuration
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(+) The maximum frequency of the SYSCLK, HCLK, PCLK1 and PCLK2 is 48000000 Hz.
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@endverbatim
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@internal
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Depending on the SYSCLK frequency, the flash latency should be adapted accordingly:
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(++) +-----------------------------------------------+
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(++) | Latency | SYSCLK clock frequency (MHz) |
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(++) |---------------|-------------------------------|
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(++) |0WS(1CPU cycle)| 0 < SYSCLK <= 24 |
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(++) |---------------|-------------------------------|
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(++) |1WS(2CPU cycle)| 24 < SYSCLK <= 48 |
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(++) +-----------------------------------------------+
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@endinternal
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* @{
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*/
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/**
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* @brief This function sets directly SystemCoreClock CMSIS variable.
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* @note Variable can be calculated also through SystemCoreClockUpdate function.
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* @param HCLKFrequency HCLK frequency in Hz (can be calculated thanks to RCC helper macro)
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* @retval None
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*/
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void LL_SetSystemCoreClock(uint32_t HCLKFrequency)
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{
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/* HCLK clock frequency */
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SystemCoreClock = HCLKFrequency;
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}
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/**
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* @brief This function configures system clock with HSI as clock source of the PLL
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* @note The application need to ensure that PLL is disabled.
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* @note Function is based on the following formula:
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* - PLL output frequency = ((HSI frequency / PREDIV) * PLLMUL)
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* - PREDIV: Set to 2 for few devices
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* - PLLMUL: The application software must set correctly the PLL multiplication factor to
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* be in the range 16-48MHz
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* @note FLASH latency can be modified through this function.
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* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
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* the configuration information for the PLL.
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* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
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* the configuration information for the BUS prescalers.
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* @retval An ErrorStatus enumeration value:
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* - SUCCESS: Max frequency configuration done
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* - ERROR: Max frequency configuration not done
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*/
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ErrorStatus LL_PLL_ConfigSystemClock_HSI(LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct,
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LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
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{
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ErrorStatus status = SUCCESS;
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uint32_t pllfreq = 0U;
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/* Check if one of the PLL is enabled */
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if (UTILS_PLL_IsBusy() == SUCCESS)
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{
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#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
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/* Check PREDIV value */
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assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
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#else
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/* Force PREDIV value to 2 */
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UTILS_PLLInitStruct->Prediv = LL_RCC_PREDIV_DIV_2;
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#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
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/* Calculate the new PLL output frequency */
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pllfreq = UTILS_GetPLLOutputFrequency(HSI_VALUE, UTILS_PLLInitStruct);
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/* Enable HSI if not enabled */
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if (LL_RCC_HSI_IsReady() != 1U)
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{
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LL_RCC_HSI_Enable();
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while (LL_RCC_HSI_IsReady() != 1U)
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{
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/* Wait for HSI ready */
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}
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}
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/* Configure PLL */
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#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
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#else
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI_DIV_2, UTILS_PLLInitStruct->PLLMul);
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#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
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/* Enable PLL and switch system clock to PLL */
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status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
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}
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else
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{
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/* Current PLL configuration cannot be modified */
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status = ERROR;
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}
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return status;
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}
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#if defined(RCC_CFGR_SW_HSI48)
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/**
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* @brief This function configures system clock with HSI48 as clock source of the PLL
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* @note The application need to ensure that PLL is disabled.
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* @note Function is based on the following formula:
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* - PLL output frequency = ((HSI48 frequency / PREDIV) * PLLMUL)
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* - PLLMUL: The application software must set correctly the PLL multiplication factor to
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* be in the range 16-48MHz
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* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
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* the configuration information for the PLL.
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* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
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* the configuration information for the BUS prescalers.
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* @retval An ErrorStatus enumeration value:
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* - SUCCESS: Max frequency configuration done
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* - ERROR: Max frequency configuration not done
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*/
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ErrorStatus LL_PLL_ConfigSystemClock_HSI48(LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct,
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LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
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{
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ErrorStatus status = SUCCESS;
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uint32_t pllfreq = 0U;
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/* Check if one of the PLL is enabled */
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if (UTILS_PLL_IsBusy() == SUCCESS)
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{
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/* Check PREDIV value */
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assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
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/* Calculate the new PLL output frequency */
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pllfreq = UTILS_GetPLLOutputFrequency(HSI48_VALUE, UTILS_PLLInitStruct);
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/* Enable HSI48 if not enabled */
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if (LL_RCC_HSI48_IsReady() != 1U)
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{
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LL_RCC_HSI48_Enable();
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while (LL_RCC_HSI48_IsReady() != 1U)
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{
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/* Wait for HSI48 ready */
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}
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}
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/* Configure PLL */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI48, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
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/* Enable PLL and switch system clock to PLL */
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status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
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}
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else
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{
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/* Current PLL configuration cannot be modified */
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status = ERROR;
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}
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return status;
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}
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#endif /*RCC_CFGR_SW_HSI48*/
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/**
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* @brief This function configures system clock with HSE as clock source of the PLL
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|
362 |
* @note The application need to ensure that PLL is disabled.
|
|
363 |
* @note Function is based on the following formula:
|
|
364 |
* - PLL output frequency = ((HSE frequency / PREDIV) * PLLMUL)
|
|
365 |
* - PLLMUL: The application software must set correctly the PLL multiplication factor to
|
|
366 |
* be in the range 16-48MHz
|
|
367 |
* @note FLASH latency can be modified through this function.
|
|
368 |
* @param HSEFrequency Value between Min_Data = 4000000 and Max_Data = 32000000
|
|
369 |
* @param HSEBypass This parameter can be one of the following values:
|
|
370 |
* @arg @ref LL_UTILS_HSEBYPASS_ON
|
|
371 |
* @arg @ref LL_UTILS_HSEBYPASS_OFF
|
|
372 |
* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
|
|
373 |
* the configuration information for the PLL.
|
|
374 |
* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
|
|
375 |
* the configuration information for the BUS prescalers.
|
|
376 |
* @retval An ErrorStatus enumeration value:
|
|
377 |
* - SUCCESS: Max frequency configuration done
|
|
378 |
* - ERROR: Max frequency configuration not done
|
|
379 |
*/
|
|
380 |
ErrorStatus LL_PLL_ConfigSystemClock_HSE(uint32_t HSEFrequency, uint32_t HSEBypass,
|
|
381 |
LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
|
|
382 |
{
|
|
383 |
ErrorStatus status = SUCCESS;
|
|
384 |
uint32_t pllfreq = 0U;
|
|
385 |
|
|
386 |
/* Check the parameters */
|
|
387 |
assert_param(IS_LL_UTILS_HSE_FREQUENCY(HSEFrequency));
|
|
388 |
assert_param(IS_LL_UTILS_HSE_BYPASS(HSEBypass));
|
|
389 |
|
|
390 |
/* Check if one of the PLL is enabled */
|
|
391 |
if (UTILS_PLL_IsBusy() == SUCCESS)
|
|
392 |
{
|
|
393 |
/* Check PREDIV value */
|
|
394 |
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
|
|
395 |
assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
|
|
396 |
#else
|
|
397 |
assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->Prediv));
|
|
398 |
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
|
|
399 |
|
|
400 |
/* Calculate the new PLL output frequency */
|
|
401 |
pllfreq = UTILS_GetPLLOutputFrequency(HSEFrequency, UTILS_PLLInitStruct);
|
|
402 |
|
|
403 |
/* Enable HSE if not enabled */
|
|
404 |
if (LL_RCC_HSE_IsReady() != 1U)
|
|
405 |
{
|
|
406 |
/* Check if need to enable HSE bypass feature or not */
|
|
407 |
if (HSEBypass == LL_UTILS_HSEBYPASS_ON)
|
|
408 |
{
|
|
409 |
LL_RCC_HSE_EnableBypass();
|
|
410 |
}
|
|
411 |
else
|
|
412 |
{
|
|
413 |
LL_RCC_HSE_DisableBypass();
|
|
414 |
}
|
|
415 |
|
|
416 |
/* Enable HSE */
|
|
417 |
LL_RCC_HSE_Enable();
|
|
418 |
while (LL_RCC_HSE_IsReady() != 1U)
|
|
419 |
{
|
|
420 |
/* Wait for HSE ready */
|
|
421 |
}
|
|
422 |
}
|
|
423 |
|
|
424 |
/* Configure PLL */
|
|
425 |
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
|
|
426 |
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
|
|
427 |
#else
|
|
428 |
LL_RCC_PLL_ConfigDomain_SYS((RCC_CFGR_PLLSRC_HSE_PREDIV | UTILS_PLLInitStruct->Prediv), UTILS_PLLInitStruct->PLLMul);
|
|
429 |
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
|
|
430 |
|
|
431 |
/* Enable PLL and switch system clock to PLL */
|
|
432 |
status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
|
|
433 |
}
|
|
434 |
else
|
|
435 |
{
|
|
436 |
/* Current PLL configuration cannot be modified */
|
|
437 |
status = ERROR;
|
|
438 |
}
|
|
439 |
|
|
440 |
return status;
|
|
441 |
}
|
|
442 |
|
|
443 |
/**
|
|
444 |
* @}
|
|
445 |
*/
|
|
446 |
|
|
447 |
/**
|
|
448 |
* @}
|
|
449 |
*/
|
|
450 |
|
|
451 |
/** @addtogroup UTILS_LL_Private_Functions
|
|
452 |
* @{
|
|
453 |
*/
|
|
454 |
/**
|
|
455 |
* @brief Update number of Flash wait states in line with new frequency and current
|
|
456 |
voltage range.
|
|
457 |
* @param Frequency SYSCLK frequency
|
|
458 |
* @retval An ErrorStatus enumeration value:
|
|
459 |
* - SUCCESS: Latency has been modified
|
|
460 |
* - ERROR: Latency cannot be modified
|
|
461 |
*/
|
|
462 |
#if defined(FLASH_ACR_LATENCY)
|
|
463 |
static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency)
|
|
464 |
{
|
|
465 |
ErrorStatus status = SUCCESS;
|
|
466 |
|
|
467 |
uint32_t latency = LL_FLASH_LATENCY_0; /* default value 0WS */
|
|
468 |
|
|
469 |
/* Frequency cannot be equal to 0 */
|
|
470 |
if (Frequency == 0U)
|
|
471 |
{
|
|
472 |
status = ERROR;
|
|
473 |
}
|
|
474 |
else
|
|
475 |
{
|
|
476 |
if (Frequency > UTILS_LATENCY1_FREQ)
|
|
477 |
{
|
|
478 |
/* 24 < SYSCLK <= 48 => 1WS (2 CPU cycles) */
|
|
479 |
latency = LL_FLASH_LATENCY_1;
|
|
480 |
}
|
|
481 |
/* else SYSCLK < 24MHz default LL_FLASH_LATENCY_0 0WS */
|
|
482 |
|
|
483 |
LL_FLASH_SetLatency(latency);
|
|
484 |
|
|
485 |
/* Check that the new number of wait states is taken into account to access the Flash
|
|
486 |
memory by reading the FLASH_ACR register */
|
|
487 |
if (LL_FLASH_GetLatency() != latency)
|
|
488 |
{
|
|
489 |
status = ERROR;
|
|
490 |
}
|
|
491 |
}
|
|
492 |
return status;
|
|
493 |
}
|
|
494 |
#endif /* FLASH_ACR_LATENCY */
|
|
495 |
|
|
496 |
/**
|
|
497 |
* @brief Function to check that PLL can be modified
|
|
498 |
* @param PLL_InputFrequency PLL input frequency (in Hz)
|
|
499 |
* @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
|
|
500 |
* the configuration information for the PLL.
|
|
501 |
* @retval PLL output frequency (in Hz)
|
|
502 |
*/
|
|
503 |
static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency, LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct)
|
|
504 |
{
|
|
505 |
uint32_t pllfreq = 0U;
|
|
506 |
|
|
507 |
/* Check the parameters */
|
|
508 |
assert_param(IS_LL_UTILS_PLLMUL_VALUE(UTILS_PLLInitStruct->PLLMul));
|
|
509 |
|
|
510 |
/* Check different PLL parameters according to RM */
|
|
511 |
/* The application software must set correctly the PLL multiplication factor to
|
|
512 |
be in the range 16-48MHz */
|
|
513 |
#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
|
|
514 |
pllfreq = __LL_RCC_CALC_PLLCLK_FREQ(PLL_InputFrequency, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
|
|
515 |
#else
|
|
516 |
pllfreq = __LL_RCC_CALC_PLLCLK_FREQ(PLL_InputFrequency / (UTILS_PLLInitStruct->Prediv + 1U), UTILS_PLLInitStruct->PLLMul);
|
|
517 |
#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
|
|
518 |
assert_param(IS_LL_UTILS_PLL_FREQUENCY(pllfreq));
|
|
519 |
|
|
520 |
return pllfreq;
|
|
521 |
}
|
|
522 |
|
|
523 |
/**
|
|
524 |
* @brief Function to check that PLL can be modified
|
|
525 |
* @retval An ErrorStatus enumeration value:
|
|
526 |
* - SUCCESS: PLL modification can be done
|
|
527 |
* - ERROR: PLL is busy
|
|
528 |
*/
|
|
529 |
static ErrorStatus UTILS_PLL_IsBusy(void)
|
|
530 |
{
|
|
531 |
ErrorStatus status = SUCCESS;
|
|
532 |
|
|
533 |
/* Check if PLL is busy*/
|
|
534 |
if (LL_RCC_PLL_IsReady() != 0U)
|
|
535 |
{
|
|
536 |
/* PLL configuration cannot be modified */
|
|
537 |
status = ERROR;
|
|
538 |
}
|
|
539 |
|
|
540 |
return status;
|
|
541 |
}
|
|
542 |
|
|
543 |
/**
|
|
544 |
* @brief Function to enable PLL and switch system clock to PLL
|
|
545 |
* @param SYSCLK_Frequency SYSCLK frequency
|
|
546 |
* @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
|
|
547 |
* the configuration information for the BUS prescalers.
|
|
548 |
* @retval An ErrorStatus enumeration value:
|
|
549 |
* - SUCCESS: No problem to switch system to PLL
|
|
550 |
* - ERROR: Problem to switch system to PLL
|
|
551 |
*/
|
|
552 |
static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
|
|
553 |
{
|
|
554 |
ErrorStatus status = SUCCESS;
|
|
555 |
uint32_t sysclk_frequency_current = 0U;
|
|
556 |
|
|
557 |
assert_param(IS_LL_UTILS_SYSCLK_DIV(UTILS_ClkInitStruct->AHBCLKDivider));
|
|
558 |
assert_param(IS_LL_UTILS_APB1_DIV(UTILS_ClkInitStruct->APB1CLKDivider));
|
|
559 |
|
|
560 |
/* Calculate current SYSCLK frequency */
|
|
561 |
sysclk_frequency_current = (SystemCoreClock << AHBPrescTable[LL_RCC_GetAHBPrescaler() >> RCC_POSITION_HPRE]);
|
|
562 |
|
|
563 |
/* Increasing the number of wait states because of higher CPU frequency */
|
|
564 |
if (sysclk_frequency_current < SYSCLK_Frequency)
|
|
565 |
{
|
|
566 |
/* Set FLASH latency to highest latency */
|
|
567 |
status = UTILS_SetFlashLatency(SYSCLK_Frequency);
|
|
568 |
}
|
|
569 |
|
|
570 |
/* Update system clock configuration */
|
|
571 |
if (status == SUCCESS)
|
|
572 |
{
|
|
573 |
/* Enable PLL */
|
|
574 |
LL_RCC_PLL_Enable();
|
|
575 |
while (LL_RCC_PLL_IsReady() != 1U)
|
|
576 |
{
|
|
577 |
/* Wait for PLL ready */
|
|
578 |
}
|
|
579 |
|
|
580 |
/* Sysclk activation on the main PLL */
|
|
581 |
LL_RCC_SetAHBPrescaler(UTILS_ClkInitStruct->AHBCLKDivider);
|
|
582 |
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
|
|
583 |
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
|
|
584 |
{
|
|
585 |
/* Wait for system clock switch to PLL */
|
|
586 |
}
|
|
587 |
|
|
588 |
/* Set APB1 & APB2 prescaler*/
|
|
589 |
LL_RCC_SetAPB1Prescaler(UTILS_ClkInitStruct->APB1CLKDivider);
|
|
590 |
}
|
|
591 |
|
|
592 |
/* Decreasing the number of wait states because of lower CPU frequency */
|
|
593 |
if (sysclk_frequency_current > SYSCLK_Frequency)
|
|
594 |
{
|
|
595 |
/* Set FLASH latency to lowest latency */
|
|
596 |
status = UTILS_SetFlashLatency(SYSCLK_Frequency);
|
|
597 |
}
|
|
598 |
|
|
599 |
/* Update SystemCoreClock variable */
|
|
600 |
if (status == SUCCESS)
|
|
601 |
{
|
|
602 |
LL_SetSystemCoreClock(__LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, UTILS_ClkInitStruct->AHBCLKDivider));
|
|
603 |
}
|
|
604 |
|
|
605 |
return status;
|
|
606 |
}
|
|
607 |
|
|
608 |
/**
|
|
609 |
* @}
|
|
610 |
*/
|
|
611 |
|
|
612 |
/**
|
|
613 |
* @}
|
|
614 |
*/
|
|
615 |
|
|
616 |
/**
|
|
617 |
* @}
|
|
618 |
*/
|
|
619 |
|
|
620 |
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|