/** | |
****************************************************************************** | |
* @file stm32l1xx_ll_utils.c | |
* @author MCD Application Team | |
* @brief UTILS LL module driver. | |
****************************************************************************** | |
* @attention | |
* | |
* <h2><center>© 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 "stm32l1xx_ll_rcc.h" | |
#include "stm32l1xx_ll_utils.h" | |
#include "stm32l1xx_ll_system.h" | |
#include "stm32l1xx_ll_pwr.h" | |
#ifdef USE_FULL_ASSERT | |
#include "stm32_assert.h" | |
#else | |
#define assert_param(expr) ((void)0U) | |
#endif | |
/** @addtogroup STM32L1xx_LL_Driver | |
* @{ | |
*/ | |
/** @addtogroup UTILS_LL | |
* @{ | |
*/ | |
/* Private types -------------------------------------------------------------*/ | |
/* Private variables ---------------------------------------------------------*/ | |
/* Private constants ---------------------------------------------------------*/ | |
/** @addtogroup UTILS_LL_Private_Constants | |
* @{ | |
*/ | |
#define UTILS_MAX_FREQUENCY_SCALE1 32000000U /*!< Maximum frequency for system clock at power scale1, in Hz */ | |
#define UTILS_MAX_FREQUENCY_SCALE2 16000000U /*!< Maximum frequency for system clock at power scale2, in Hz */ | |
#define UTILS_MAX_FREQUENCY_SCALE3 4000000U /*!< Maximum frequency for system clock at power scale3, in Hz */ | |
/* Defines used for PLL range */ | |
#define UTILS_PLLVCO_OUTPUT_SCALE1 96000000U /*!< Frequency max for PLLVCO output at power scale1, in Hz */ | |
#define UTILS_PLLVCO_OUTPUT_SCALE2 48000000U /*!< Frequency max for PLLVCO output at power scale2, in Hz */ | |
#define UTILS_PLLVCO_OUTPUT_SCALE3 24000000U /*!< Frequency max for PLLVCO output at power scale3, in Hz */ | |
/* Defines used for HSE range */ | |
#define UTILS_HSE_FREQUENCY_MIN 1000000U /*!< Frequency min for HSE frequency, in Hz */ | |
#define UTILS_HSE_FREQUENCY_MAX 24000000U /*!< Frequency max for HSE frequency, in Hz */ | |
/* Defines used for FLASH latency according to HCLK Frequency */ | |
#define UTILS_SCALE1_LATENCY1_FREQ 16000000U /*!< HCLK frequency to set FLASH latency 1 in power scale 1 */ | |
#define UTILS_SCALE2_LATENCY1_FREQ 8000000U /*!< HCLK frequency to set FLASH latency 1 in power scale 2 */ | |
#define UTILS_SCALE3_LATENCY1_FREQ 2000000U /*!< HCLK frequency to set FLASH latency 1 in power scale 3 */ | |
/** | |
* @} | |
*/ | |
/* 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_APB2_DIV(__VALUE__) (((__VALUE__) == LL_RCC_APB2_DIV_1) \ | |
|| ((__VALUE__) == LL_RCC_APB2_DIV_2) \ | |
|| ((__VALUE__) == LL_RCC_APB2_DIV_4) \ | |
|| ((__VALUE__) == LL_RCC_APB2_DIV_8) \ | |
|| ((__VALUE__) == LL_RCC_APB2_DIV_16)) | |
#define IS_LL_UTILS_PLLMUL_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLL_MUL_3) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_4) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_6) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_8) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_12) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_16) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_24) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_32) \ | |
|| ((__VALUE__) == LL_RCC_PLL_MUL_48)) | |
#define IS_LL_UTILS_PLLDIV_VALUE(__VALUE__) (((__VALUE__) == LL_RCC_PLL_DIV_2) || ((__VALUE__) == LL_RCC_PLL_DIV_3) || \ | |
((__VALUE__) == LL_RCC_PLL_DIV_4)) | |
#define IS_LL_UTILS_PLLVCO_OUTPUT(__VALUE__) ((LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE1) ? ((__VALUE__) <= UTILS_PLLVCO_OUTPUT_SCALE1) : \ | |
((LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE2) ? ((__VALUE__) <= UTILS_PLLVCO_OUTPUT_SCALE2) : \ | |
((__VALUE__) <= UTILS_PLLVCO_OUTPUT_SCALE3))) | |
#define IS_LL_UTILS_PLL_FREQUENCY(__VALUE__) ((LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE1) ? ((__VALUE__) <= UTILS_MAX_FREQUENCY_SCALE1) : \ | |
((LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE2) ? ((__VALUE__) <= UTILS_MAX_FREQUENCY_SCALE2) : \ | |
((__VALUE__) <= UTILS_MAX_FREQUENCY_SCALE3))) | |
#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); | |
#if defined(FLASH_ACR_LATENCY) | |
static ErrorStatus UTILS_SetFlashLatency(uint32_t Frequency); | |
#endif /* FLASH_ACR_LATENCY */ | |
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 32000000 Hz. | |
@endverbatim | |
@internal | |
Depending on the device voltage range, the maximum frequency should be | |
adapted accordingly: | |
(++) +----------------------------------------------------------------+ | |
(++) | Wait states | HCLK clock frequency (MHz) | | |
(++) | |------------------------------------------------| | |
(++) | (Latency) | voltage range | voltage range | | |
(++) | | 1.65 V - 3.6 V | 2.0 V - 3.6 V | | |
(++) | |----------------|---------------|---------------| | |
(++) | | VCORE = 1.2 V | VCORE = 1.5 V | VCORE = 1.8 V | | |
(++) |-------------- |----------------|---------------|---------------| | |
(++) |0WS(1CPU cycle)|0 < HCLK <= 2 |0 < HCLK <= 8 |0 < HCLK <= 16 | | |
(++) |---------------|----------------|---------------|---------------| | |
(++) |1WS(2CPU cycle)|2 < HCLK <= 4 |8 < HCLK <= 16 |16 < HCLK <= 32| | |
(++) +----------------------------------------------------------------+ | |
@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 * PLLMul) / PLLDiv) | |
* - PLLMul: The application software must set correctly the PLL multiplication factor to avoid exceeding | |
* - 96 MHz as PLLVCO when the product is in range 1, | |
* - 48 MHz as PLLVCO when the product is in range 2, | |
* - 24 MHz when the product is in range 3 | |
* @note FLASH latency can be modified through this function. | |
* @note If this latency increases to 1WS, FLASH 64-bit access will be automatically enabled. | |
* A decrease of FLASH latency to 0WS will not disable 64-bit access. If needed, user should call | |
* the following function @ref LL_FLASH_Disable64bitAccess. | |
* @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) | |
{ | |
/* 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 */ | |
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSI, 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; | |
} | |
/** | |
* @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 * PLLMul) / PLLDiv) | |
* - PLLMul: The application software must set correctly the PLL multiplication factor to avoid exceeding | |
* - 96 MHz as PLLVCO when the product is in range 1, | |
* - 48 MHz as PLLVCO when the product is in range 2, | |
* - 24 MHz when the product is in range 3 | |
* @note FLASH latency can be modified through this function. | |
* @note If this latency increases to 1WS, FLASH 64-bit access will be automatically enabled. | |
* A decrease of FLASH latency to 0WS will not disable 64-bit access. If needed, user should call | |
* the following function @ref LL_FLASH_Disable64bitAccess. | |
* @param HSEFrequency Value between Min_Data = 1000000 and Max_Data = 24000000 | |
* @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) | |
{ | |
/* 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 */ | |
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, 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; | |
} | |
/** | |
* @} | |
*/ | |
/** | |
* @} | |
*/ | |
/** @addtogroup UTILS_LL_Private_Functions | |
* @{ | |
*/ | |
/** | |
* @brief Update number of Flash wait states in line with new frequency and current | |
voltage range. | |
* @param Frequency HCLK frequency | |
* @retval An ErrorStatus enumeration value: | |
* - SUCCESS: Latency has been modified | |
* - ERROR: Latency cannot be modified | |
*/ | |
#if defined(FLASH_ACR_LATENCY) | |
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 (LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE1) | |
{ | |
if (Frequency > UTILS_SCALE1_LATENCY1_FREQ) | |
{ | |
/* 16 < HCLK <= 32 => 1WS (2 CPU cycles) */ | |
latency = LL_FLASH_LATENCY_1; | |
} | |
/* else HCLK < 16MHz default LL_FLASH_LATENCY_0 0WS */ | |
} | |
else if (LL_PWR_GetRegulVoltageScaling() == LL_PWR_REGU_VOLTAGE_SCALE2) | |
{ | |
if (Frequency > UTILS_SCALE2_LATENCY1_FREQ) | |
{ | |
/* 8 < HCLK <= 16 => 1WS (2 CPU cycles) */ | |
latency = LL_FLASH_LATENCY_1; | |
} | |
/* else HCLK < 8MHz default LL_FLASH_LATENCY_0 0WS */ | |
} | |
else | |
{ | |
if (Frequency > UTILS_SCALE3_LATENCY1_FREQ) | |
{ | |
/* 2 < HCLK <= 4 => 1WS (2 CPU cycles) */ | |
latency = LL_FLASH_LATENCY_1; | |
} | |
/* else HCLK < 4MHz default LL_FLASH_LATENCY_0 0WS */ | |
} | |
/* Latency cannot be set to 1WS only if 64-bit access bit is enabled */ | |
if (latency == LL_FLASH_LATENCY_1) | |
{ | |
LL_FLASH_Enable64bitAccess(); | |
} | |
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; | |
} | |
#endif /* FLASH_ACR_LATENCY */ | |
/** | |
* @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)); | |
assert_param(IS_LL_UTILS_PLLDIV_VALUE(UTILS_PLLInitStruct->PLLDiv)); | |
/* Check different PLL parameters according to RM */ | |
/* The application software must set correctly the PLL multiplication factor to avoid exceeding | |
96 MHz as PLLVCO when the product is in range 1, | |
48 MHz as PLLVCO when the product is in range 2, | |
24 MHz when the product is in range 3. */ | |
pllfreq = PLL_InputFrequency * (PLLMulTable[UTILS_PLLInitStruct->PLLMul >> RCC_POSITION_PLLMUL]); | |
assert_param(IS_LL_UTILS_PLLVCO_OUTPUT(pllfreq)); | |
/* The application software must set correctly the PLL multiplication factor to avoid exceeding | |
maximum frequency 32000000 in range 1 */ | |
pllfreq = pllfreq / ((UTILS_PLLInitStruct->PLLDiv >> RCC_POSITION_PLLDIV)+1U); | |
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 hclk_frequency = 0U; | |
assert_param(IS_LL_UTILS_SYSCLK_DIV(UTILS_ClkInitStruct->AHBCLKDivider)); | |
assert_param(IS_LL_UTILS_APB1_DIV(UTILS_ClkInitStruct->APB1CLKDivider)); | |
assert_param(IS_LL_UTILS_APB2_DIV(UTILS_ClkInitStruct->APB2CLKDivider)); | |
/* Calculate HCLK frequency */ | |
hclk_frequency = __LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, UTILS_ClkInitStruct->AHBCLKDivider); | |
/* Increasing the number of wait states because of higher CPU frequency */ | |
if (SystemCoreClock < hclk_frequency) | |
{ | |
/* Set FLASH latency to highest latency */ | |
status = UTILS_SetFlashLatency(hclk_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); | |
LL_RCC_SetAPB2Prescaler(UTILS_ClkInitStruct->APB2CLKDivider); | |
} | |
/* Decreasing the number of wait states because of lower CPU frequency */ | |
if (SystemCoreClock > hclk_frequency) | |
{ | |
/* Set FLASH latency to lowest latency */ | |
status = UTILS_SetFlashLatency(hclk_frequency); | |
} | |
/* Update SystemCoreClock variable */ | |
if (status == SUCCESS) | |
{ | |
LL_SetSystemCoreClock(hclk_frequency); | |
} | |
return status; | |
} | |
/** | |
* @} | |
*/ | |
/** | |
* @} | |
*/ | |
/** | |
* @} | |
*/ | |
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |