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_GetUSBClockFreq (uint32_t USBxSource)
	Return USBx clock frequency.
uint32_t	LL_RCC_GetADCClockFreq (uint32_t ADCxSource)
	Return ADCx 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 HSI_VALUE(**) or HSE_VALUE(***) multiplied/divided by the PLL factors.; (**) HSI_VALUE is a defined constant but the real value may vary depending on the variations in voltage and temperature.; (***) HSE_VALUE is a defined constant, 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_GetADCClockFreq ( uint32_t ADCxSource )

Return ADCx clock frequency.

Parameters:

ADCxSource

This parameter can be one of the following values:

LL_RCC_ADC_CLKSOURCE

Return values:

ADC	clock frequency (in Hz)

Definition at line 306 of file stm32f1xx_ll_rcc.c.

References assert_param, IS_LL_RCC_ADC_CLKSOURCE, LL_RCC_GetADCClockSource(), RCC_GetHCLKClockFreq(), RCC_GetPCLK2ClockFreq(), and RCC_GetSystemClockFreq().

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 190 of file stm32f1xx_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: