mbed official
mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_STM/TARGET_STM32F0/device/stm32f0xx_ll_utils.c
- Revision:
- 156:95d6b41a828b
- Child:
- 180:96ed750bd169
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F0/device/stm32f0xx_ll_utils.c Mon Jan 16 15:03:32 2017 +0000
@@ -0,0 +1,620 @@
+/**
+ ******************************************************************************
+ * @file stm32f0xx_ll_utils.c
+ * @author MCD Application Team
+ * @version V1.4.0
+ * @date 27-May-2016
+ * @brief UTILS LL module driver.
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>© COPYRIGHT(c) 2016 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 "stm32f0xx_ll_rcc.h"
+#include "stm32f0xx_ll_utils.h"
+#include "stm32f0xx_ll_system.h"
+#ifdef USE_FULL_ASSERT
+#include "stm32_assert.h"
+#else
+#define assert_param(expr) ((void)0U)
+#endif
+
+/** @addtogroup STM32F0xx_LL_Driver
+ * @{
+ */
+
+/** @addtogroup UTILS_LL
+ * @{
+ */
+
+/* Private types -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private constants ---------------------------------------------------------*/
+/** @addtogroup UTILS_LL_Private_Constants
+ * @{
+ */
+
+/* Defines used for PLL range */
+#define UTILS_PLL_OUTPUT_MIN ((uint32_t)16000000U) /*!< Frequency min for PLL output, in Hz */
+#define UTILS_PLL_OUTPUT_MAX ((uint32_t)48000000U) /*!< Frequency max for PLL output, in Hz */
+
+/* Defines used for HSE range */
+#define UTILS_HSE_FREQUENCY_MIN ((uint32_t)4000000U) /*!< Frequency min for HSE frequency, in Hz */
+#define UTILS_HSE_FREQUENCY_MAX ((uint32_t)32000000U) /*!< Frequency max for HSE frequency, in Hz */
+
+/* Defines used for FLASH latency according to SYSCLK Frequency */
+#define UTILS_LATENCY1_FREQ ((uint32_t)24000000U) /*!< SYSCLK frequency to set FLASH latency 1 */
+/**
+ * @}
+ */
+/* Private macros ------------------------------------------------------------*/
+/** @addtogroup UTILS_LL_Private_Macros
+ * @{
+ */
+#define IS_LL_UTILS_SYSCLK_DIV(__VALUE__) (((__VALUE__) == LL_RCC_SYSCLK_DIV_1) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_2) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_4) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_8) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_16) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_64) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_128) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_256) \
+ || ((__VALUE__) == LL_RCC_SYSCLK_DIV_512))
+
+#define IS_LL_UTILS_APB1_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB1_DIV_1) \
+ || ((__VALUE__) == LL_RCC_APB1_DIV_2) \
+ || ((__VALUE__) == LL_RCC_APB1_DIV_4) \
+ || ((__VALUE__) == LL_RCC_APB1_DIV_8) \
+ || ((__VALUE__) == LL_RCC_APB1_DIV_16))
+
+#define IS_LL_UTILS_PLLMUL_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLL_MUL_2) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_3) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_4) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_5) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_6) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_7) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_8) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_9) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_10) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_11) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_12) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_13) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_14) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_15) \
+ || ((__VALUE__) == LL_RCC_PLL_MUL_16))
+
+#define IS_LL_UTILS_PREDIV_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PREDIV_DIV_1) || ((__VALUE__) == LL_RCC_PREDIV_DIV_2) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_3) || ((__VALUE__) == LL_RCC_PREDIV_DIV_4) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_5) || ((__VALUE__) == LL_RCC_PREDIV_DIV_6) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_7) || ((__VALUE__) == LL_RCC_PREDIV_DIV_8) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_9) || ((__VALUE__) == LL_RCC_PREDIV_DIV_10) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_11) || ((__VALUE__) == LL_RCC_PREDIV_DIV_12) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_13) || ((__VALUE__) == LL_RCC_PREDIV_DIV_14) || \
+ ((__VALUE__) == LL_RCC_PREDIV_DIV_15) || ((__VALUE__) == LL_RCC_PREDIV_DIV_16))
+
+#define IS_LL_UTILS_PLL_FREQUENCY(__VALUE__) ((UTILS_PLL_OUTPUT_MIN <= (__VALUE__)) && ((__VALUE__) <= UTILS_PLL_OUTPUT_MAX))
+
+
+#define IS_LL_UTILS_HSE_BYPASS(__STATE__) (((__STATE__) == LL_UTILS_HSEBYPASS_ON) \
+ || ((__STATE__) == LL_UTILS_HSEBYPASS_OFF))
+
+#define IS_LL_UTILS_HSE_FREQUENCY(__FREQUENCY__) (((__FREQUENCY__) >= UTILS_HSE_FREQUENCY_MIN) && ((__FREQUENCY__) <= UTILS_HSE_FREQUENCY_MAX))
+/**
+ * @}
+ */
+/* Private function prototypes -----------------------------------------------*/
+/** @defgroup UTILS_LL_Private_Functions UTILS Private functions
+ * @{
+ */
+static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency,
+ LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct);
+static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency);
+static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct);
+static ErrorStatus UTILS_PLL_IsBusy(void);
+/**
+ * @}
+ */
+
+/* Exported functions --------------------------------------------------------*/
+/** @addtogroup UTILS_LL_Exported_Functions
+ * @{
+ */
+
+/** @addtogroup UTILS_LL_EF_DELAY
+ * @{
+ */
+
+/**
+ * @brief This function configures the Cortex-M SysTick source to have 1ms time base.
+ * @note When a RTOS is used, it is recommended to avoid changing the Systick
+ * configuration by calling this function, for a delay use rather osDelay RTOS service.
+ * @param HCLKFrequency HCLK frequency in Hz
+ * @note HCLK frequency can be calculated thanks to RCC helper macro or function @ref LL_RCC_GetSystemClocksFreq
+ * @retval None
+ */
+void LL_Init1msTick(uint32_t HCLKFrequency)
+{
+ /* Use frequency provided in argument */
+ LL_InitTick(HCLKFrequency, 1000U);
+}
+
+/**
+ * @brief This function provides accurate delay (in milliseconds) based
+ * on SysTick counter flag
+ * @note When a RTOS is used, it is recommended to avoid using blocking delay
+ * and use rather osDelay service.
+ * @note To respect 1ms timebase, user should call @ref LL_Init1msTick function which
+ * will configure Systick to 1ms
+ * @param Delay specifies the delay time length, in milliseconds.
+ * @retval None
+ */
+void LL_mDelay(uint32_t Delay)
+{
+ __IO uint32_t tmp = SysTick->CTRL; /* Clear the COUNTFLAG first */
+ /* Add this code to indicate that local variable is not used */
+ ((void)tmp);
+
+ /* Add a period to guaranty minimum wait */
+ if (Delay < LL_MAX_DELAY)
+ {
+ Delay++;
+ }
+
+ while (Delay)
+ {
+ if ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) != 0U)
+ {
+ Delay--;
+ }
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @addtogroup UTILS_EF_SYSTEM
+ * @brief System Configuration functions
+ *
+ @verbatim
+ ===============================================================================
+ ##### System Configuration functions #####
+ ===============================================================================
+ [..]
+ System, AHB and APB buses clocks configuration
+
+ (+) The maximum frequency of the SYSCLK, HCLK, PCLK1 and PCLK2 is 48000000 Hz.
+ @endverbatim
+ @internal
+ Depending on the SYSCLK frequency, the flash latency should be adapted accordingly:
+ (++) +-----------------------------------------------+
+ (++) | Latency | SYSCLK clock frequency (MHz) |
+ (++) |---------------|-------------------------------|
+ (++) |0WS(1CPU cycle)| 0 < SYSCLK <= 24 |
+ (++) |---------------|-------------------------------|
+ (++) |1WS(2CPU cycle)| 24 < SYSCLK <= 48 |
+ (++) +-----------------------------------------------+
+ @endinternal
+ * @{
+ */
+
+/**
+ * @brief This function sets directly SystemCoreClock CMSIS variable.
+ * @note Variable can be calculated also through SystemCoreClockUpdate function.
+ * @param HCLKFrequency HCLK frequency in Hz (can be calculated thanks to RCC helper macro)
+ * @retval None
+ */
+void LL_SetSystemCoreClock(uint32_t HCLKFrequency)
+{
+ /* HCLK clock frequency */
+ SystemCoreClock = HCLKFrequency;
+}
+
+/**
+ * @brief This function configures system clock with HSI as clock source of the PLL
+ * @note The application need to ensure that PLL is disabled.
+ * @note Function is based on the following formula:
+ * - PLL output frequency = ((HSI frequency / PREDIV) * PLLMUL)
+ * - PREDIV: Set to 2 for few devices
+ * - PLLMUL: The application software must set correctly the PLL multiplication factor to
+ * be in the range 16-48MHz
+ * @note FLASH latency can be modified through this function.
+ * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
+ * the configuration information for the PLL.
+ * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
+ * the configuration information for the BUS prescalers.
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: Max frequency configuration done
+ * - ERROR: Max frequency configuration not done
+ */
+ErrorStatus LL_PLL_ConfigSystemClock_HSI(LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct,
+ LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
+{
+ ErrorStatus status = SUCCESS;
+ uint32_t pllfreq = 0U;
+
+ /* Check if one of the PLL is enabled */
+ if (UTILS_PLL_IsBusy() == SUCCESS)
+ {
+#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
+ /* Check PREDIV value */
+ assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
+#else
+ /* Force PREDIV value to 2 */
+ UTILS_PLLInitStruct->Prediv = LL_RCC_PREDIV_DIV_2;
+#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
+
+ /* Calculate the new PLL output frequency */
+ pllfreq = UTILS_GetPLLOutputFrequency(HSI_VALUE, UTILS_PLLInitStruct);
+
+ /* Enable HSI if not enabled */
+ if (LL_RCC_HSI_IsReady() != 1U)
+ {
+ LL_RCC_HSI_Enable();
+ while (LL_RCC_HSI_IsReady() != 1U)
+ {
+ /* Wait for HSI ready */
+ }
+ }
+
+ /* Configure PLL */
+#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
+ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
+#else
+ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI_DIV_2, UTILS_PLLInitStruct->PLLMul);
+#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
+
+ /* Enable PLL and switch system clock to PLL */
+ status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
+ }
+ else
+ {
+ /* Current PLL configuration cannot be modified */
+ status = ERROR;
+ }
+
+ return status;
+}
+
+#if defined(RCC_CFGR_SW_HSI48)
+/**
+ * @brief This function configures system clock with HSI48 as clock source of the PLL
+ * @note The application need to ensure that PLL is disabled.
+ * @note Function is based on the following formula:
+ * - PLL output frequency = ((HSI48 frequency / PREDIV) * PLLMUL)
+ * - PLLMUL: The application software must set correctly the PLL multiplication factor to
+ * be in the range 16-48MHz
+ * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
+ * the configuration information for the PLL.
+ * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
+ * the configuration information for the BUS prescalers.
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: Max frequency configuration done
+ * - ERROR: Max frequency configuration not done
+ */
+ErrorStatus LL_PLL_ConfigSystemClock_HSI48(LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct,
+ LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
+{
+ ErrorStatus status = SUCCESS;
+ uint32_t pllfreq = 0U;
+
+ /* Check if one of the PLL is enabled */
+ if (UTILS_PLL_IsBusy() == SUCCESS)
+ {
+ /* Check PREDIV value */
+ assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
+
+ /* Calculate the new PLL output frequency */
+ pllfreq = UTILS_GetPLLOutputFrequency(HSI48_VALUE, UTILS_PLLInitStruct);
+
+ /* Enable HSI48 if not enabled */
+ if (LL_RCC_HSI48_IsReady() != 1U)
+ {
+ LL_RCC_HSI48_Enable();
+ while (LL_RCC_HSI48_IsReady() != 1U)
+ {
+ /* Wait for HSI48 ready */
+ }
+ }
+
+ /* Configure PLL */
+ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI48, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
+
+ /* Enable PLL and switch system clock to PLL */
+ status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
+ }
+ else
+ {
+ /* Current PLL configuration cannot be modified */
+ status = ERROR;
+ }
+
+ return status;
+}
+
+#endif /*RCC_CFGR_SW_HSI48*/
+/**
+ * @brief This function configures system clock with HSE as clock source of the PLL
+ * @note The application need to ensure that PLL is disabled.
+ * @note Function is based on the following formula:
+ * - PLL output frequency = ((HSE frequency / PREDIV) * PLLMUL)
+ * - PLLMUL: The application software must set correctly the PLL multiplication factor to
+ * be in the range 16-48MHz
+ * @note FLASH latency can be modified through this function.
+ * @param HSEFrequency Value between Min_Data = 4000000 and Max_Data = 32000000
+ * @param HSEBypass This parameter can be one of the following values:
+ * @arg @ref LL_UTILS_HSEBYPASS_ON
+ * @arg @ref LL_UTILS_HSEBYPASS_OFF
+ * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
+ * the configuration information for the PLL.
+ * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
+ * the configuration information for the BUS prescalers.
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: Max frequency configuration done
+ * - ERROR: Max frequency configuration not done
+ */
+ErrorStatus LL_PLL_ConfigSystemClock_HSE(uint32_t HSEFrequency, uint32_t HSEBypass,
+ LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
+{
+ ErrorStatus status = SUCCESS;
+ uint32_t pllfreq = 0U;
+
+ /* Check the parameters */
+ assert_param(IS_LL_UTILS_HSE_FREQUENCY(HSEFrequency));
+ assert_param(IS_LL_UTILS_HSE_BYPASS(HSEBypass));
+
+ /* Check if one of the PLL is enabled */
+ if (UTILS_PLL_IsBusy() == SUCCESS)
+ {
+ /* Check PREDIV value */
+#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
+ assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->PLLDiv));
+#else
+ assert_param(IS_LL_UTILS_PREDIV_VALUE(UTILS_PLLInitStruct->Prediv));
+#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
+
+ /* Calculate the new PLL output frequency */
+ pllfreq = UTILS_GetPLLOutputFrequency(HSEFrequency, UTILS_PLLInitStruct);
+
+ /* Enable HSE if not enabled */
+ if (LL_RCC_HSE_IsReady() != 1U)
+ {
+ /* Check if need to enable HSE bypass feature or not */
+ if (HSEBypass == LL_UTILS_HSEBYPASS_ON)
+ {
+ LL_RCC_HSE_EnableBypass();
+ }
+ else
+ {
+ LL_RCC_HSE_DisableBypass();
+ }
+
+ /* Enable HSE */
+ LL_RCC_HSE_Enable();
+ while (LL_RCC_HSE_IsReady() != 1U)
+ {
+ /* Wait for HSE ready */
+ }
+ }
+
+ /* Configure PLL */
+#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
+ LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
+#else
+ LL_RCC_PLL_ConfigDomain_SYS((RCC_CFGR_PLLSRC_HSE_PREDIV | UTILS_PLLInitStruct->Prediv), UTILS_PLLInitStruct->PLLMul);
+#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
+
+ /* Enable PLL and switch system clock to PLL */
+ status = UTILS_EnablePLLAndSwitchSystem(pllfreq, UTILS_ClkInitStruct);
+ }
+ else
+ {
+ /* Current PLL configuration cannot be modified */
+ status = ERROR;
+ }
+
+ return status;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/** @addtogroup UTILS_LL_Private_Functions
+ * @{
+ */
+/**
+ * @brief Update number of Flash wait states in line with new frequency and current
+ voltage range.
+ * @param Frequency SYSCLK frequency
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: Latency has been modified
+ * - ERROR: Latency cannot be modified
+ */
+static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency)
+{
+ ErrorStatus status = SUCCESS;
+
+ uint32_t latency = LL_FLASH_LATENCY_0; /* default value 0WS */
+
+ /* Frequency cannot be equal to 0 */
+ if (Frequency == 0U)
+ {
+ status = ERROR;
+ }
+ else
+ {
+ if (Frequency > UTILS_LATENCY1_FREQ)
+ {
+ /* 24 < SYSCLK <= 48 => 1WS (2 CPU cycles) */
+ latency = LL_FLASH_LATENCY_1;
+ }
+ /* else SYSCLK < 24MHz default LL_FLASH_LATENCY_0 0WS */
+
+ LL_FLASH_SetLatency(latency);
+
+ /* Check that the new number of wait states is taken into account to access the Flash
+ memory by reading the FLASH_ACR register */
+ if (LL_FLASH_GetLatency() != latency)
+ {
+ status = ERROR;
+ }
+ }
+ return status;
+}
+
+/**
+ * @brief Function to check that PLL can be modified
+ * @param PLL_InputFrequency PLL input frequency (in Hz)
+ * @param UTILS_PLLInitStruct pointer to a @ref LL_UTILS_PLLInitTypeDef structure that contains
+ * the configuration information for the PLL.
+ * @retval PLL output frequency (in Hz)
+ */
+static uint32_t UTILS_GetPLLOutputFrequency(uint32_t PLL_InputFrequency, LL_UTILS_PLLInitTypeDef *UTILS_PLLInitStruct)
+{
+ uint32_t pllfreq = 0U;
+
+ /* Check the parameters */
+ assert_param(IS_LL_UTILS_PLLMUL_VALUE(UTILS_PLLInitStruct->PLLMul));
+
+ /* Check different PLL parameters according to RM */
+ /* The application software must set correctly the PLL multiplication factor to
+ be in the range 16-48MHz */
+#if defined(RCC_PLLSRC_PREDIV1_SUPPORT)
+ pllfreq = __LL_RCC_CALC_PLLCLK_FREQ(PLL_InputFrequency, UTILS_PLLInitStruct->PLLMul, UTILS_PLLInitStruct->PLLDiv);
+#else
+ pllfreq = __LL_RCC_CALC_PLLCLK_FREQ(PLL_InputFrequency / (UTILS_PLLInitStruct->Prediv + 1U), UTILS_PLLInitStruct->PLLMul);
+#endif /*RCC_PLLSRC_PREDIV1_SUPPORT*/
+ assert_param(IS_LL_UTILS_PLL_FREQUENCY(pllfreq));
+
+ return pllfreq;
+}
+
+/**
+ * @brief Function to check that PLL can be modified
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: PLL modification can be done
+ * - ERROR: PLL is busy
+ */
+static ErrorStatus UTILS_PLL_IsBusy(void)
+{
+ ErrorStatus status = SUCCESS;
+
+ /* Check if PLL is busy*/
+ if (LL_RCC_PLL_IsReady() != 0U)
+ {
+ /* PLL configuration cannot be modified */
+ status = ERROR;
+ }
+
+
+ return status;
+}
+
+/**
+ * @brief Function to enable PLL and switch system clock to PLL
+ * @param SYSCLK_Frequency SYSCLK frequency
+ * @param UTILS_ClkInitStruct pointer to a @ref LL_UTILS_ClkInitTypeDef structure that contains
+ * the configuration information for the BUS prescalers.
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: No problem to switch system to PLL
+ * - ERROR: Problem to switch system to PLL
+ */
+static ErrorStatus UTILS_EnablePLLAndSwitchSystem(uint32_t SYSCLK_Frequency, LL_UTILS_ClkInitTypeDef *UTILS_ClkInitStruct)
+{
+ ErrorStatus status = SUCCESS;
+ uint32_t sysclk_frequency_current = 0U;
+
+ assert_param(IS_LL_UTILS_SYSCLK_DIV(UTILS_ClkInitStruct->AHBCLKDivider));
+ assert_param(IS_LL_UTILS_APB1_DIV(UTILS_ClkInitStruct->APB1CLKDivider));
+
+ /* Calculate current SYSCLK frequency */
+ sysclk_frequency_current = (SystemCoreClock << AHBPrescTable[(UTILS_ClkInitStruct->AHBCLKDivider & RCC_CFGR_HPRE) >> RCC_POSITION_HPRE]);
+
+ /* Increasing the number of wait states because of higher CPU frequency */
+ if (sysclk_frequency_current < SYSCLK_Frequency)
+ {
+ /* Set FLASH latency to highest latency */
+ status = UTILS_SetFlashLatency(SYSCLK_Frequency);
+ }
+
+ /* Update system clock configuration */
+ if (status == SUCCESS)
+ {
+ /* Enable PLL */
+ LL_RCC_PLL_Enable();
+ while (LL_RCC_PLL_IsReady() != 1U)
+ {
+ /* Wait for PLL ready */
+ }
+
+ /* Sysclk activation on the main PLL */
+ LL_RCC_SetAHBPrescaler(UTILS_ClkInitStruct->AHBCLKDivider);
+ LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
+ while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
+ {
+ /* Wait for system clock switch to PLL */
+ }
+
+ /* Set APB1 & APB2 prescaler*/
+ LL_RCC_SetAPB1Prescaler(UTILS_ClkInitStruct->APB1CLKDivider);
+ }
+
+ /* Decreasing the number of wait states because of lower CPU frequency */
+ if (sysclk_frequency_current > SYSCLK_Frequency)
+ {
+ /* Set FLASH latency to lowest latency */
+ status = UTILS_SetFlashLatency(SYSCLK_Frequency);
+ }
+
+ /* Update SystemCoreClock variable */
+ if (status == SUCCESS)
+ {
+ LL_SetSystemCoreClock(__LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, UTILS_ClkInitStruct->AHBCLKDivider));
+ }
+
+ return status;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
