Return the frequencies of different on chip clocks; System, AHB, APB1 and APB2 buses clocks and different peripheral clocks available on the device. More...

Functions
void	LL_RCC_GetSystemClocksFreq (LL_RCC_ClocksTypeDef *RCC_Clocks)
	Return the frequencies of different on chip clocks; System, AHB, APB1 and APB2 buses clocks.
uint32_t	LL_RCC_GetI2SClockFreq (uint32_t I2SxSource)
	Return I2Sx clock frequency.
uint32_t	LL_RCC_GetSAIClockFreq (uint32_t SAIxSource)
	Return SAIx clock frequency.
uint32_t	LL_RCC_GetSDIOClockFreq (uint32_t SDIOxSource)
	Return SDIOx clock frequency.
uint32_t	LL_RCC_GetRNGClockFreq (uint32_t RNGxSource)
	Return RNGx clock frequency.
uint32_t	LL_RCC_GetUSBClockFreq (uint32_t USBxSource)
	Return USBx clock frequency.
uint32_t	LL_RCC_GetLTDCClockFreq (uint32_t LTDCxSource)
	Return LTDC clock frequency.

Detailed Description

Return the frequencies of different on chip clocks; System, AHB, APB1 and APB2 buses clocks and different peripheral clocks available on the device.

Note:: If SYSCLK source is HSI, function returns values based on HSI_VALUE(**); If SYSCLK source is HSE, function returns values based on HSE_VALUE(***); If SYSCLK source is PLL, function returns values based on HSE_VALUE(***) or HSI_VALUE(**) multiplied/divided by the PLL factors.; (**) HSI_VALUE is a constant defined in this file (default value 16 MHz) but the real value may vary depending on the variations in voltage and temperature.; (***) HSE_VALUE is a constant defined in this file (default value 25 MHz), user has to ensure that HSE_VALUE is same as the real frequency of the crystal used. Otherwise, this function may have wrong result.; The result of this function could be incorrect when using fractional value for HSE crystal.; This function can be used by the user application to compute the baud-rate for the communication peripherals or configure other parameters.

Function Documentation

uint32_t LL_RCC_GetI2SClockFreq ( uint32_t I2SxSource )

Return I2Sx clock frequency.

Parameters:

I2SxSource

This parameter can be one of the following values:

LL_RCC_I2S1_CLKSOURCE
LL_RCC_I2S2_CLKSOURCE (*)

(*) value not defined in all devices.

Return values:

I2S	clock frequency (in Hz) LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator is not ready

Definition at line 385 of file stm32f4xx_ll_rcc.c.

References assert_param, EXTERNAL_CLOCK_VALUE, HSE_VALUE, HSI_VALUE, IS_LL_RCC_I2S_CLKSOURCE, LL_RCC_GetI2SClockSource(), LL_RCC_HSE_IsReady(), LL_RCC_HSI_IsReady(), LL_RCC_I2S1_CLKSOURCE, LL_RCC_I2S1_CLKSOURCE_PIN, LL_RCC_I2S1_CLKSOURCE_PLLI2S, LL_RCC_PERIPH_FREQUENCY_NO, LL_RCC_PLL_GetMainSource(), LL_RCC_PLL_IsReady(), LL_RCC_PLLI2S_IsReady(), LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLSOURCE_HSI, and RCC_PLLI2S_GetFreqDomain_I2S().

Referenced by LL_I2S_Init().

uint32_t LL_RCC_GetLTDCClockFreq ( uint32_t LTDCxSource )

Return LTDC clock frequency.

Parameters:

LTDCxSource

This parameter can be one of the following values:

LL_RCC_LTDC_CLKSOURCE

Return values:

LTDC	clock frequency (in Hz) LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator PLLSAI is not ready

Definition at line 1064 of file stm32f4xx_ll_rcc.c.

References assert_param, IS_LL_RCC_LTDC_CLKSOURCE, LL_RCC_PERIPH_FREQUENCY_NO, LL_RCC_PLLSAI_IsReady(), and RCC_PLLSAI_GetFreqDomain_LTDC().

uint32_t LL_RCC_GetRNGClockFreq ( uint32_t RNGxSource )

Return RNGx clock frequency.

Parameters:

RNGxSource

This parameter can be one of the following values:

LL_RCC_RNG_CLKSOURCE

Return values:

RNG	clock frequency (in Hz) LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator is not ready

Definition at line 768 of file stm32f4xx_ll_rcc.c.

References assert_param, IS_LL_RCC_RNG_CLKSOURCE, LL_RCC_PERIPH_FREQUENCY_NO, LL_RCC_PLL_IsReady(), LL_RCC_PLLI2S_IsReady(), LL_RCC_PLLSAI_IsReady(), and RCC_PLL_GetFreqDomain_48M().

uint32_t LL_RCC_GetSAIClockFreq ( uint32_t SAIxSource )

Return SAIx clock frequency.

Parameters:

SAIxSource

This parameter can be one of the following values:

LL_RCC_SAI1_CLKSOURCE (*)
LL_RCC_SAI2_CLKSOURCE (*)
LL_RCC_SAI1_A_CLKSOURCE (*)
LL_RCC_SAI1_B_CLKSOURCE (*)

(*) value not defined in all devices.

Return values:

SAI	clock frequency (in Hz) LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator is not ready

Definition at line 557 of file stm32f4xx_ll_rcc.c.

References assert_param, EXTERNAL_CLOCK_VALUE, HSE_VALUE, HSI_VALUE, IS_LL_RCC_SAI_CLKSOURCE, LL_RCC_GetSAIClockSource(), LL_RCC_HSE_IsReady(), LL_RCC_HSI_IsReady(), LL_RCC_PERIPH_FREQUENCY_NO, LL_RCC_PLL_GetMainSource(), LL_RCC_PLL_IsReady(), LL_RCC_PLLI2S_IsReady(), LL_RCC_PLLSAI_IsReady(), LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLSOURCE_HSI, LL_RCC_SAI1_A_CLKSOURCE, LL_RCC_SAI1_A_CLKSOURCE_PIN, LL_RCC_SAI1_A_CLKSOURCE_PLLI2S, LL_RCC_SAI1_A_CLKSOURCE_PLLSAI, LL_RCC_SAI1_B_CLKSOURCE, LL_RCC_SAI1_B_CLKSOURCE_PIN, LL_RCC_SAI1_B_CLKSOURCE_PLLI2S, LL_RCC_SAI1_B_CLKSOURCE_PLLSAI, RCC_PLLI2S_GetFreqDomain_SAI(), and RCC_PLLSAI_GetFreqDomain_SAI().

uint32_t LL_RCC_GetSDIOClockFreq ( uint32_t SDIOxSource )

Return SDIOx clock frequency.

Parameters:

SDIOxSource

This parameter can be one of the following values:

LL_RCC_SDIO_CLKSOURCE

Return values:

SDIO	clock frequency (in Hz) LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator is not ready

Definition at line 697 of file stm32f4xx_ll_rcc.c.

References assert_param, IS_LL_RCC_SDIO_CLKSOURCE, LL_RCC_PERIPH_FREQUENCY_NO, LL_RCC_PLL_IsReady(), LL_RCC_PLLI2S_IsReady(), LL_RCC_PLLSAI_IsReady(), LL_RCC_SDIO_CLKSOURCE, RCC_GetSystemClockFreq(), and RCC_PLL_GetFreqDomain_48M().

void LL_RCC_GetSystemClocksFreq ( LL_RCC_ClocksTypeDef * RCC_Clocks )

Return the frequencies of different on chip clocks; System, AHB, APB1 and APB2 buses clocks.

Note:: Each time SYSCLK, HCLK, PCLK1 and/or PCLK2 clock changes, this function must be called to update structure fields. Otherwise, any configuration based on this function will be incorrect.

Parameters:

RCC_Clocks pointer to a LL_RCC_ClocksTypeDef structure which will hold the clocks frequencies

Return values:

None

Definition at line 318 of file stm32f4xx_ll_rcc.c.

References LL_RCC_ClocksTypeDef::HCLK_Frequency, LL_RCC_ClocksTypeDef::PCLK1_Frequency, LL_RCC_ClocksTypeDef::PCLK2_Frequency, RCC_GetHCLKClockFreq(), RCC_GetPCLK1ClockFreq(), RCC_GetPCLK2ClockFreq(), RCC_GetSystemClockFreq(), and LL_RCC_ClocksTypeDef::SYSCLK_Frequency.

Referenced by LL_I2C_Init(), and LL_USART_Init().

uint32_t LL_RCC_GetUSBClockFreq ( uint32_t USBxSource )

Return USBx clock frequency.

Parameters:

USBxSource

This parameter can be one of the following values: