System Configuration functions. More...

Functions
void	LL_SetSystemCoreClock (uint32_t HCLKFrequency)
	This function sets directly SystemCoreClock CMSIS variable.
ErrorStatus	LL_PLL_ConfigSystemClock_HSI (LL_UTILS_PLLInitTypeDef UTILS_PLLInitStruct, LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct)
	This function configures system clock at maximum frequency with HSI as clock source of the PLL.
ErrorStatus	LL_PLL_ConfigSystemClock_HSE (uint32_t HSEFrequency, uint32_t HSEBypass, LL_UTILS_PLLInitTypeDef UTILS_PLLInitStruct, LL_UTILS_ClkInitTypeDef UTILS_ClkInitStruct)
	This function configures system clock with HSE as clock source of the PLL.

Detailed Description

System Configuration functions.

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           ##### System Configuration functions #####
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    [..]
         System, AHB and APB buses clocks configuration

         (+) The maximum frequency of the SYSCLK, HCLK, PCLK1 and PCLK2 is 180000000 Hz.

Function Documentation

ErrorStatus LL_PLL_ConfigSystemClock_HSE	(	uint32_t	HSEFrequency,
		uint32_t	HSEBypass,
		LL_UTILS_PLLInitTypeDef *	UTILS_PLLInitStruct,
		LL_UTILS_ClkInitTypeDef *	UTILS_ClkInitStruct
	)

This function configures system clock with HSE as clock source of the PLL.

Note:

The application need to ensure that PLL is disabled.

PLL output frequency = (((HSI frequency / PLLM) * PLLN) / PLLP)
PLLM: ensure that the VCO input frequency ranges from RCC_PLLVCO_INPUT_MIN to RCC_PLLVCO_INPUT_MAX (PLLVCO_input = HSI frequency / PLLM)
PLLN: ensure that the VCO output frequency is between RCC_PLLVCO_OUTPUT_MIN and RCC_PLLVCO_OUTPUT_MAX (PLLVCO_output = PLLVCO_input * PLLN)
PLLP: ensure that max frequency at 180000000 Hz is reach (PLLVCO_output / PLLP)

Parameters:

HSEFrequency	Value between Min_Data = 4000000 and Max_Data = 26000000
HSEBypass	This parameter can be one of the following values: LL_UTILS_HSEBYPASS_ON LL_UTILS_HSEBYPASS_OFF
UTILS_PLLInitStruct	pointer to a LL_UTILS_PLLInitTypeDef structure that contains the configuration information for the PLL.
UTILS_ClkInitStruct	pointer to a LL_UTILS_ClkInitTypeDef structure that contains the configuration information for the BUS prescalers.

Return values:

An	ErrorStatus enumeration value: SUCCESS: Max frequency configuration done ERROR: Max frequency configuration not done

Definition at line 420 of file stm32f4xx_ll_utils.c.

References assert_param, IS_LL_UTILS_HSE_BYPASS, IS_LL_UTILS_HSE_FREQUENCY, LL_RCC_HSE_DisableBypass(), LL_RCC_HSE_Enable(), LL_RCC_HSE_EnableBypass(), LL_RCC_HSE_IsReady(), LL_RCC_PLL_ConfigDomain_SYS(), LL_RCC_PLLSOURCE_HSE, LL_UTILS_HSEBYPASS_ON, LL_UTILS_PLLInitTypeDef::PLLM, LL_UTILS_PLLInitTypeDef::PLLN, LL_UTILS_PLLInitTypeDef::PLLP, UTILS_EnablePLLAndSwitchSystem(), UTILS_GetPLLOutputFrequency(), and UTILS_PLL_IsBusy().

ErrorStatus LL_PLL_ConfigSystemClock_HSI	(	LL_UTILS_PLLInitTypeDef *	UTILS_PLLInitStruct,
		LL_UTILS_ClkInitTypeDef *	UTILS_ClkInitStruct
	)

This function configures system clock at maximum frequency with HSI as clock source of the PLL.

Note:

The application need to ensure that PLL is disabled.

Function is based on the following formula:

PLL output frequency = (((HSI frequency / PLLM) * PLLN) / PLLP)
PLLM: ensure that the VCO input frequency ranges from RCC_PLLVCO_INPUT_MIN to RCC_PLLVCO_INPUT_MAX (PLLVCO_input = HSI frequency / PLLM)
PLLN: ensure that the VCO output frequency is between RCC_PLLVCO_OUTPUT_MIN and RCC_PLLVCO_OUTPUT_MAX (PLLVCO_output = PLLVCO_input * PLLN)
PLLP: ensure that max frequency at 180000000 Hz is reach (PLLVCO_output / PLLP)

Parameters:

UTILS_PLLInitStruct	pointer to a LL_UTILS_PLLInitTypeDef structure that contains the configuration information for the PLL.
UTILS_ClkInitStruct	pointer to a LL_UTILS_ClkInitTypeDef structure that contains the configuration information for the BUS prescalers.

Return values:

An	ErrorStatus enumeration value: SUCCESS: Max frequency configuration done ERROR: Max frequency configuration not done

Definition at line 363 of file stm32f4xx_ll_utils.c.

References HSI_VALUE, LL_RCC_HSI_Enable(), LL_RCC_HSI_IsReady(), LL_RCC_PLL_ConfigDomain_SYS(), LL_RCC_PLLSOURCE_HSI, LL_UTILS_PLLInitTypeDef::PLLM, LL_UTILS_PLLInitTypeDef::PLLN, LL_UTILS_PLLInitTypeDef::PLLP, UTILS_EnablePLLAndSwitchSystem(), UTILS_GetPLLOutputFrequency(), and UTILS_PLL_IsBusy().

void LL_SetSystemCoreClock ( uint32_t HCLKFrequency )

This function sets directly SystemCoreClock CMSIS variable.

Note:: Variable can be calculated also through SystemCoreClockUpdate function.

Parameters:

HCLKFrequency HCLK frequency in Hz (can be calculated thanks to RCC helper macro)

Return values:

None

Definition at line 341 of file stm32f4xx_ll_utils.c.

Referenced by UTILS_EnablePLLAndSwitchSystem().

Functions

Detailed Description

Function Documentation