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TUKS-COURSE-TIMER
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TUKS MCU Introductory course
Get system and peripherals clocks frequency functions
[RCC Exported Functions]
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_GetUSARTClockFreq (uint32_t USARTxSource) |
| Return USARTx clock frequency. | |
| uint32_t | LL_RCC_GetUARTClockFreq (uint32_t UARTxSource) |
| Return UARTx clock frequency. | |
| uint32_t | LL_RCC_GetI2CClockFreq (uint32_t I2CxSource) |
| Return I2Cx clock frequency. | |
| uint32_t | LL_RCC_GetLPUARTClockFreq (uint32_t LPUARTxSource) |
| Return LPUARTx clock frequency. | |
| uint32_t | LL_RCC_GetLPTIMClockFreq (uint32_t LPTIMxSource) |
| Return LPTIMx clock frequency. | |
| uint32_t | LL_RCC_GetSAIClockFreq (uint32_t SAIxSource) |
| Return SAIx clock frequency. | |
| uint32_t | LL_RCC_GetSDMMCClockFreq (uint32_t SDMMCxSource) |
| Return SDMMCx 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_GetADCClockFreq (uint32_t ADCxSource) |
| Return ADCx clock frequency. | |
| uint32_t | LL_RCC_GetSWPMIClockFreq (uint32_t SWPMIxSource) |
| Return SWPMIx clock frequency. | |
| uint32_t | LL_RCC_GetDFSDMClockFreq (uint32_t DFSDMxSource) |
| Return DFSDMx 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 MSI, function returns values based on MSI_VALUE(*)
- 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(**) or MSI_VALUE(*) multiplied/divided by the PLL factors.
- (*) MSI_VALUE is a constant defined in this file (default value 4 MHz) but the real value may vary depending on the variations in voltage and temperature.
- (**) 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 8 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_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) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (MSI) or PLL is not ready
- LL_RCC_PERIPH_FREQUENCY_NA indicates that no clock source selected
Definition at line 962 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetDFSDMClockFreq | ( | uint32_t | DFSDMxSource ) |
Return DFSDMx clock frequency.
- Parameters:
-
DFSDMxSource This parameter can be one of the following values: - LL_RCC_DFSDM1_CLKSOURCE
- Return values:
-
DFSDM clock frequency (in Hz)
Definition at line 1040 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetI2CClockFreq | ( | uint32_t | I2CxSource ) |
Return I2Cx clock frequency.
- Parameters:
-
I2CxSource This parameter can be one of the following values: - LL_RCC_I2C1_CLKSOURCE
- LL_RCC_I2C2_CLKSOURCE (*)
(*) value not defined in all devices.
- LL_RCC_I2C3_CLKSOURCE
- Return values:
-
I2C clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that HSI oscillator is not ready
Definition at line 492 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetLPTIMClockFreq | ( | uint32_t | LPTIMxSource ) |
Return LPTIMx clock frequency.
- Parameters:
-
LPTIMxSource This parameter can be one of the following values: - LL_RCC_LPTIM1_CLKSOURCE
- LL_RCC_LPTIM2_CLKSOURCE
- Return values:
-
LPTIM clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready
Definition at line 626 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetLPUARTClockFreq | ( | uint32_t | LPUARTxSource ) |
Return LPUARTx clock frequency.
- Parameters:
-
LPUARTxSource This parameter can be one of the following values: - LL_RCC_LPUART1_CLKSOURCE
- Return values:
-
LPUART clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready
Definition at line 581 of file stm32l4xx_ll_rcc.c.
| 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 (MSI) or PLL is not ready
- LL_RCC_PERIPH_FREQUENCY_NA indicates that no clock source selected
Definition at line 858 of file stm32l4xx_ll_rcc.c.
| 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 (*)
(*) value not defined in all devices.
- Return values:
-
SAI clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that PLL is not ready
- LL_RCC_PERIPH_FREQUENCY_NA indicates that external clock is used
Definition at line 715 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetSDMMCClockFreq | ( | uint32_t | SDMMCxSource ) |
Return SDMMCx clock frequency.
- Parameters:
-
SDMMCxSource This parameter can be one of the following values: - LL_RCC_SDMMC1_CLKSOURCE
- Return values:
-
SDMMC clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (MSI) or PLL is not ready
- LL_RCC_PERIPH_FREQUENCY_NA indicates that no clock source selected
Definition at line 807 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetSWPMIClockFreq | ( | uint32_t | SWPMIxSource ) |
Return SWPMIx clock frequency.
- Parameters:
-
SWPMIxSource This parameter can be one of the following values: - LL_RCC_SWPMI1_CLKSOURCE
- Return values:
-
SWPMI clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI) is not ready
Definition at line 1007 of file stm32l4xx_ll_rcc.c.
| 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 269 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetUARTClockFreq | ( | uint32_t | UARTxSource ) |
Return UARTx clock frequency.
- Parameters:
-
UARTxSource This parameter can be one of the following values: - LL_RCC_UART4_CLKSOURCE
- LL_RCC_UART5_CLKSOURCE
- Return values:
-
UART clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready
Definition at line 406 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetUSARTClockFreq | ( | uint32_t | USARTxSource ) |
Return USARTx clock frequency.
- Parameters:
-
USARTxSource This parameter can be one of the following values: - LL_RCC_USART1_CLKSOURCE
- LL_RCC_USART2_CLKSOURCE
- LL_RCC_USART3_CLKSOURCE (*)
(*) value not defined in all devices.
- Return values:
-
USART clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready
Definition at line 295 of file stm32l4xx_ll_rcc.c.
| uint32_t LL_RCC_GetUSBClockFreq | ( | uint32_t | USBxSource ) |
Return USBx clock frequency.
- Parameters:
-
USBxSource This parameter can be one of the following values: - LL_RCC_USB_CLKSOURCE
- Return values:
-
USB clock frequency (in Hz) - LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (MSI) or PLL is not ready
- LL_RCC_PERIPH_FREQUENCY_NA indicates that no clock source selected
Definition at line 910 of file stm32l4xx_ll_rcc.c.
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