Get Clock source

Macros
#define	__HAL_RCC_SYSCLK_CONFIG(__SYSCLKSOURCE__)    MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__SYSCLKSOURCE__))
	Macro to configure the system clock source.
#define	__HAL_RCC_GET_SYSCLK_SOURCE()   ((uint32_t)(READ_BIT(RCC->CFGR,RCC_CFGR_SWS)))
	Macro to get the clock source used as system clock.
#define	__HAL_RCC_SYSCLK_CONFIG(__RCC_SYSCLKSOURCE__)   MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__RCC_SYSCLKSOURCE__))
	Macro to configure the system clock source.
#define	__HAL_RCC_GET_SYSCLK_SOURCE()   (RCC->CFGR & RCC_CFGR_SWS)
	Macro to get the clock source used as system clock.
#define	__HAL_RCC_GET_PLL_OSCSOURCE()   ((uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC))
	Macro to get the oscillator used as PLL clock source.
#define	__HAL_RCC_SYSCLK_CONFIG(__RCC_SYSCLKSOURCE__)   MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__RCC_SYSCLKSOURCE__))
	Macro to configure the system clock source.
#define	__HAL_RCC_GET_SYSCLK_SOURCE()   (RCC->CFGR & RCC_CFGR_SWS)
	Macro to get the clock source used as system clock.
#define	__HAL_RCC_GET_PLL_OSCSOURCE()   ((uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC))
	Macro to get the oscillator used as PLL clock source.
#define	__HAL_RCC_SYSCLK_CONFIG(__RCC_SYSCLKSOURCE__)   MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__RCC_SYSCLKSOURCE__))
	Macro to configure the system clock source.
#define	__HAL_RCC_GET_SYSCLK_SOURCE()   (RCC->CFGR & RCC_CFGR_SWS)
	Macro to get the clock source used as system clock.
#define	__HAL_RCC_LSEDRIVE_CONFIG(__RCC_LSEDRIVE__)    (MODIFY_REG(RCC->BDCR, RCC_BDCR_LSEDRV, (uint32_t)(__RCC_LSEDRIVE__) ))
	Macro to configures the External Low Speed oscillator (LSE) drive capability.
#define	__HAL_RCC_GET_PLL_OSCSOURCE()   ((uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC))
	Macro to get the oscillator used as PLL clock source.

Macro Definition Documentation

__HAL_RCC_GET_PLL_OSCSOURCE [1/3]

#define __HAL_RCC_GET_PLL_OSCSOURCE

(

)

((uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC))

Return values

The	oscillator used as PLL clock source. The returned value can be one of the following: RCC_PLLSOURCE_HSI: HSI oscillator is used as PLL clock source. RCC_PLLSOURCE_HSE: HSE oscillator is used as PLL clock source.

__HAL_RCC_GET_PLL_OSCSOURCE [2/3]

#define __HAL_RCC_GET_PLL_OSCSOURCE

(

)

((uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC))

Return values

The	oscillator used as PLL clock source. The returned value can be one of the following: RCC_PLLSOURCE_HSI: HSI oscillator is used as PLL clock source. RCC_PLLSOURCE_HSE: HSE oscillator is used as PLL clock source.

__HAL_RCC_GET_PLL_OSCSOURCE [3/3]

#define __HAL_RCC_GET_PLL_OSCSOURCE

(

)

((uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC))

Return values

The	oscillator used as PLL clock source. The returned value can be one of the following: RCC_PLLSOURCE_HSI: HSI oscillator is used as PLL clock source. RCC_PLLSOURCE_HSE: HSE oscillator is used as PLL clock source.

__HAL_RCC_GET_SYSCLK_SOURCE [1/4]

#define __HAL_RCC_GET_SYSCLK_SOURCE

(

)

((uint32_t)(READ_BIT(RCC->CFGR,RCC_CFGR_SWS)))

Return values

The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI HSI used as system clock RCC_SYSCLKSOURCE_STATUS_HSE HSE used as system clock RCC_SYSCLKSOURCE_STATUS_PLLCLK PLL used as system clock
The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock.
The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLRCLK: PLLR used as system clock. This parameter is available only for STM32F446xx devices.

__HAL_RCC_GET_SYSCLK_SOURCE [2/4]

#define __HAL_RCC_GET_SYSCLK_SOURCE

(

)

(RCC->CFGR & RCC_CFGR_SWS)

Return values

The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock.
The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLRCLK: PLLR used as system clock. This parameter is available only for STM32F446xx devices.

__HAL_RCC_GET_SYSCLK_SOURCE [3/4]

#define __HAL_RCC_GET_SYSCLK_SOURCE

(

)

(RCC->CFGR & RCC_CFGR_SWS)

Return values

The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLRCLK: PLLR used as system clock. This parameter is available only for STM32F446xx devices.
The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock.

__HAL_RCC_GET_SYSCLK_SOURCE [4/4]

#define __HAL_RCC_GET_SYSCLK_SOURCE

(

)

(RCC->CFGR & RCC_CFGR_SWS)

Return values

The	clock source used as system clock. The returned value can be one of the following: RCC_SYSCLKSOURCE_STATUS_HSI: HSI used as system clock. RCC_SYSCLKSOURCE_STATUS_HSE: HSE used as system clock. RCC_SYSCLKSOURCE_STATUS_PLLCLK: PLL used as system clock.

__HAL_RCC_LSEDRIVE_CONFIG

#define __HAL_RCC_LSEDRIVE_CONFIG

(

__RCC_LSEDRIVE__

)

(MODIFY_REG(RCC->BDCR, RCC_BDCR_LSEDRV, (uint32_t)(__RCC_LSEDRIVE__) ))

Note

As the LSE is in the Backup domain and write access is denied to this domain after reset, you have to enable write access using HAL_PWR_EnableBkUpAccess() function before to configure the LSE (to be done once after reset).

Parameters

__RCC_LSEDRIVE__

specifies the new state of the LSE drive capability. This parameter can be one of the following values: RCC_LSEDRIVE_LOW: LSE oscillator low drive capability. RCC_LSEDRIVE_MEDIUMLOW: LSE oscillator medium low drive capability. RCC_LSEDRIVE_MEDIUMHIGH: LSE oscillator medium high drive capability. RCC_LSEDRIVE_HIGH: LSE oscillator high drive capability.

Return values

None

__HAL_RCC_SYSCLK_CONFIG [1/4]

#define __HAL_RCC_SYSCLK_CONFIG

(

__RCC_SYSCLKSOURCE__

)

MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__RCC_SYSCLKSOURCE__))

Parameters

__RCC_SYSCLKSOURCE__

specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source.

__RCC_SYSCLKSOURCE__

specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source. RCC_SYSCLKSOURCE_PLLRCLK: PLLR output is used as system clock source. This parameter is available only for STM32F446xx devices.

__HAL_RCC_SYSCLK_CONFIG [2/4]

#define __HAL_RCC_SYSCLK_CONFIG

(

__RCC_SYSCLKSOURCE__

)

MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__RCC_SYSCLKSOURCE__))

Parameters

__RCC_SYSCLKSOURCE__

specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source. RCC_SYSCLKSOURCE_PLLRCLK: PLLR output is used as system clock source. This parameter is available only for STM32F446xx devices.

__RCC_SYSCLKSOURCE__

specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source.

__HAL_RCC_SYSCLK_CONFIG [3/4]

#define __HAL_RCC_SYSCLK_CONFIG

(

__RCC_SYSCLKSOURCE__

)

MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__RCC_SYSCLKSOURCE__))

Parameters

__RCC_SYSCLKSOURCE__

specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source.

__HAL_RCC_SYSCLK_CONFIG [4/4]

#define __HAL_RCC_SYSCLK_CONFIG

(

__SYSCLKSOURCE__

)

MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, (__SYSCLKSOURCE__))

Parameters

__SYSCLKSOURCE__	specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK PLL output is used as system clock source.
__RCC_SYSCLKSOURCE__	specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source.
__RCC_SYSCLKSOURCE__	specifies the system clock source. This parameter can be one of the following values: RCC_SYSCLKSOURCE_HSI: HSI oscillator is used as system clock source. RCC_SYSCLKSOURCE_HSE: HSE oscillator is used as system clock source. RCC_SYSCLKSOURCE_PLLCLK: PLL output is used as system clock source. RCC_SYSCLKSOURCE_PLLRCLK: PLLR output is used as system clock source. This parameter is available only for STM32F446xx devices.