Functions
Collaboration diagram for RCC_Exported_Functions:

Functions

void RCC_ADCCLKConfig (uint32_t RCC_PCLK2)
 Configures the ADC clock (ADCCLK). More...
 
void RCC_AdjustHSICalibrationValue (uint8_t HSICalibrationValue)
 Adjusts the Internal High Speed oscillator (HSI) calibration value. More...
 
void RCC_AHBPeriphClockCmd (uint32_t RCC_AHBPeriph, FunctionalState NewState)
 Enables or disables the AHB peripheral clock. More...
 
void RCC_APB1PeriphClockCmd (uint32_t RCC_APB1Periph, FunctionalState NewState)
 Enables or disables the Low Speed APB (APB1) peripheral clock. More...
 
void RCC_APB1PeriphResetCmd (uint32_t RCC_APB1Periph, FunctionalState NewState)
 Forces or releases Low Speed APB (APB1) peripheral reset. More...
 
void RCC_APB2PeriphClockCmd (uint32_t RCC_APB2Periph, FunctionalState NewState)
 Enables or disables the High Speed APB (APB2) peripheral clock. More...
 
void RCC_APB2PeriphResetCmd (uint32_t RCC_APB2Periph, FunctionalState NewState)
 Forces or releases High Speed APB (APB2) peripheral reset. More...
 
void RCC_BackupResetCmd (FunctionalState NewState)
 Forces or releases the Backup domain reset. More...
 
void RCC_ClearFlag (void)
 Clears the RCC reset flags. The reset flags are: RCC_FLAG_PINRST, RCC_FLAG_PORRST, RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST. More...
 
void RCC_ClearITPendingBit (uint8_t RCC_IT)
 Clears the RCC's interrupt pending bits. More...
 
void RCC_ClockSecuritySystemCmd (FunctionalState NewState)
 Enables or disables the Clock Security System. More...
 
void RCC_DeInit (void)
 Resets the RCC clock configuration to the default reset state. More...
 
void RCC_GetClocksFreq (RCC_ClocksTypeDef *RCC_Clocks)
 Returns the frequencies of different on chip clocks; SYSCLK, HCLK, PCLK1 and PCLK2. More...
 
FlagStatus RCC_GetFlagStatus (uint8_t RCC_FLAG)
 Checks whether the specified RCC flag is set or not. More...
 
ITStatus RCC_GetITStatus (uint8_t RCC_IT)
 Checks whether the specified RCC interrupt has occurred or not. More...
 
uint8_t RCC_GetSYSCLKSource (void)
 Returns the clock source used as system clock. More...
 
void RCC_HCLKConfig (uint32_t RCC_SYSCLK)
 Configures the AHB clock (HCLK). More...
 
void RCC_HSEConfig (uint32_t RCC_HSE)
 Configures the External High Speed oscillator (HSE). More...
 
void RCC_HSICmd (FunctionalState NewState)
 Enables or disables the Internal High Speed oscillator (HSI). More...
 
void RCC_ITConfig (uint8_t RCC_IT, FunctionalState NewState)
 Enables or disables the specified RCC interrupts. More...
 
void RCC_LSEConfig (uint8_t RCC_LSE)
 Configures the External Low Speed oscillator (LSE). More...
 
void RCC_LSICmd (FunctionalState NewState)
 Enables or disables the Internal Low Speed oscillator (LSI). More...
 
void RCC_MCOConfig (uint8_t RCC_MCO)
 Selects the clock source to output on MCO pin. More...
 
void RCC_PCLK1Config (uint32_t RCC_HCLK)
 Configures the Low Speed APB clock (PCLK1). More...
 
void RCC_PCLK2Config (uint32_t RCC_HCLK)
 Configures the High Speed APB clock (PCLK2). More...
 
void RCC_PLLCmd (FunctionalState NewState)
 Enables or disables the main PLL. More...
 
void RCC_PLLConfig (uint32_t RCC_PLLSource, uint32_t RCC_PLLMul)
 Configures the PLL clock source and multiplication factor. More...
 
void RCC_RTCCLKCmd (FunctionalState NewState)
 Enables or disables the RTC clock. More...
 
void RCC_RTCCLKConfig (uint32_t RCC_RTCCLKSource)
 Configures the RTC clock (RTCCLK). More...
 
void RCC_SYSCLKConfig (uint32_t RCC_SYSCLKSource)
 Configures the system clock (SYSCLK). More...
 
void RCC_USBCLKConfig (uint32_t RCC_USBCLKSource)
 Configures the USB clock (USBCLK). More...
 
ErrorStatus RCC_WaitForHSEStartUp (void)
 Waits for HSE start-up. More...
 

Detailed Description

Function Documentation

void RCC_ADCCLKConfig ( uint32_t  RCC_PLLCLK)

Configures the ADC clock (ADCCLK).

Parameters
RCC_PCLK2defines the ADC clock divider. This clock is derived from the APB2 clock (PCLK2). This parameter can be one of the following values:
  • RCC_PCLK2_Div2: ADC clock = PCLK2/2
  • RCC_PCLK2_Div4: ADC clock = PCLK2/4
  • RCC_PCLK2_Div6: ADC clock = PCLK2/6
  • RCC_PCLK2_Div8: ADC clock = PCLK2/8
Return values
None
Parameters
RCC_PLLCLKdefines the ADC clock divider. This clock is derived from the PLL Clock. This parameter can be one of the following values:
  • RCC_ADC12PLLCLK_OFF: ADC12 clock disabled
  • RCC_ADC12PLLCLK_Div1: ADC12 clock = PLLCLK/1
  • RCC_ADC12PLLCLK_Div2: ADC12 clock = PLLCLK/2
  • RCC_ADC12PLLCLK_Div4: ADC12 clock = PLLCLK/4
  • RCC_ADC12PLLCLK_Div6: ADC12 clock = PLLCLK/6
  • RCC_ADC12PLLCLK_Div8: ADC12 clock = PLLCLK/8
  • RCC_ADC12PLLCLK_Div10: ADC12 clock = PLLCLK/10
  • RCC_ADC12PLLCLK_Div12: ADC12 clock = PLLCLK/12
  • RCC_ADC12PLLCLK_Div16: ADC12 clock = PLLCLK/16
  • RCC_ADC12PLLCLK_Div32: ADC12 clock = PLLCLK/32
  • RCC_ADC12PLLCLK_Div64: ADC12 clock = PLLCLK/64
  • RCC_ADC12PLLCLK_Div128: ADC12 clock = PLLCLK/128
  • RCC_ADC12PLLCLK_Div256: ADC12 clock = PLLCLK/256
  • RCC_ADC34PLLCLK_OFF: ADC34 clock disabled
  • RCC_ADC34PLLCLK_Div1: ADC34 clock = PLLCLK/1
  • RCC_ADC34PLLCLK_Div2: ADC34 clock = PLLCLK/2
  • RCC_ADC34PLLCLK_Div4: ADC34 clock = PLLCLK/4
  • RCC_ADC34PLLCLK_Div6: ADC34 clock = PLLCLK/6
  • RCC_ADC34PLLCLK_Div8: ADC34 clock = PLLCLK/8
  • RCC_ADC34PLLCLK_Div10: ADC34 clock = PLLCLK/10
  • RCC_ADC34PLLCLK_Div12: ADC34 clock = PLLCLK/12
  • RCC_ADC34PLLCLK_Div16: ADC34 clock = PLLCLK/16
  • RCC_ADC34PLLCLK_Div32: ADC34 clock = PLLCLK/32
  • RCC_ADC34PLLCLK_Div64: ADC34 clock = PLLCLK/64
  • RCC_ADC34PLLCLK_Div128: ADC34 clock = PLLCLK/128
  • RCC_ADC34PLLCLK_Div256: ADC34 clock = PLLCLK/256
Return values
None

Definition at line 767 of file stm32f10x_rcc.c.

void RCC_AdjustHSICalibrationValue ( uint8_t  HSICalibrationValue)

Adjusts the Internal High Speed oscillator (HSI) calibration value.

Note
The calibration is used to compensate for the variations in voltage and temperature that influence the frequency of the internal HSI RC.
Parameters
HSICalibrationValuespecifies the calibration trimming value. This parameter must be a number between 0 and 0x1F.
Return values
None
Note
The calibration is used to compensate for the variations in voltage and temperature that influence the frequency of the internal HSI RC. Refer to the Application Note AN3300 for more details on how to calibrate the HSI.
Parameters
HSICalibrationValuespecifies the HSI calibration trimming value. This parameter must be a number between 0 and 0x1F.
Return values
None
Parameters
HSICalibrationValuespecifies the calibration trimming value. This parameter must be a number between 0 and 0x1F.
Return values
None

Definition at line 339 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_AHBPeriphClockCmd ( uint32_t  RCC_AHBPeriph,
FunctionalState  NewState 
)

Enables or disables the AHB peripheral clock.

Parameters
RCC_AHBPeriphspecifies the AHB peripheral to gates its clock.

For STM32_Connectivity_line_devices, this parameter can be any combination of the following values:

  • RCC_AHBPeriph_DMA1
  • RCC_AHBPeriph_DMA2
  • RCC_AHBPeriph_SRAM
  • RCC_AHBPeriph_FLITF
  • RCC_AHBPeriph_CRC
  • RCC_AHBPeriph_OTG_FS
  • RCC_AHBPeriph_ETH_MAC
  • RCC_AHBPeriph_ETH_MAC_Tx
  • RCC_AHBPeriph_ETH_MAC_Rx

For other_STM32_devices, this parameter can be any combination of the following values:

  • RCC_AHBPeriph_DMA1
  • RCC_AHBPeriph_DMA2
  • RCC_AHBPeriph_SRAM
  • RCC_AHBPeriph_FLITF
  • RCC_AHBPeriph_CRC
  • RCC_AHBPeriph_FSMC
  • RCC_AHBPeriph_SDIO
Note
SRAM and FLITF clock can be disabled only during sleep mode.
Parameters
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_AHBPeriphspecifies the AHB peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_AHBPeriph_GPIOA
  • RCC_AHBPeriph_GPIOB
  • RCC_AHBPeriph_GPIOC
  • RCC_AHBPeriph_GPIOD
  • RCC_AHBPeriph_GPIOE
  • RCC_AHBPeriph_GPIOF
  • RCC_AHBPeriph_TS
  • RCC_AHBPeriph_CRC
  • RCC_AHBPeriph_FLITF (has effect only when the Flash memory is in power down mode)
  • RCC_AHBPeriph_SRAM
  • RCC_AHBPeriph_DMA2
  • RCC_AHBPeriph_DMA1
  • RCC_AHBPeriph_ADC34
  • RCC_AHBPeriph_ADC12
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 1065 of file stm32f10x_rcc.c.

void RCC_APB1PeriphClockCmd ( uint32_t  RCC_APB1Periph,
FunctionalState  NewState 
)

Enables or disables the Low Speed APB (APB1) peripheral clock.

Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2: TIM2 clock
  • RCC_APB1Periph_TIM3: TIM3 clock
  • RCC_APB1Periph_TIM4: TIM4 clock
  • RCC_APB1Periph_TIM5: TIM5 clock
  • RCC_APB1Periph_TIM6: TIM6 clock
  • RCC_APB1Periph_TIM7: TIM7 clock
  • RCC_APB1Periph_TIM12: TIM12 clock
  • RCC_APB1Periph_TIM13: TIM13 clock
  • RCC_APB1Periph_TIM14: TIM14 clock
  • RCC_APB1Periph_LPTIM1: LPTIM1 clock (STM32F410xx devices)
  • RCC_APB1Periph_WWDG: WWDG clock
  • RCC_APB1Periph_SPI2: SPI2 clock
  • RCC_APB1Periph_SPI3: SPI3 clock
  • RCC_APB1Periph_SPDIF: SPDIF RX clock (STM32F446xx devices)
  • RCC_APB1Periph_USART2: USART2 clock
  • RCC_APB1Periph_USART3: USART3 clock
  • RCC_APB1Periph_UART4: UART4 clock
  • RCC_APB1Periph_UART5: UART5 clock
  • RCC_APB1Periph_I2C1: I2C1 clock
  • RCC_APB1Periph_I2C2: I2C2 clock
  • RCC_APB1Periph_I2C3: I2C3 clock
  • RCC_APB1Periph_FMPI2C1: FMPI2C1 clock
  • RCC_APB1Periph_CAN1: CAN1 clock
  • RCC_APB1Periph_CAN2: CAN2 clock
  • RCC_APB1Periph_CEC: CEC clock (STM32F446xx devices)
  • RCC_APB1Periph_PWR: PWR clock
  • RCC_APB1Periph_DAC: DAC clock
  • RCC_APB1Periph_UART7: UART7 clock
  • RCC_APB1Periph_UART8: UART8 clock
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2: TIM2 clock
  • RCC_APB1Periph_TIM3: TIM3 clock
  • RCC_APB1Periph_TIM4: TIM4 clock
  • RCC_APB1Periph_TIM5: TIM5 clock
  • RCC_APB1Periph_TIM6: TIM6 clock
  • RCC_APB1Periph_TIM7: TIM7 clock
  • RCC_APB1Periph_TIM12: TIM12 clock
  • RCC_APB1Periph_TIM13: TIM13 clock
  • RCC_APB1Periph_TIM14: TIM14 clock
  • RCC_APB1Periph_WWDG: WWDG clock
  • RCC_APB1Periph_SPI2: SPI2 clock
  • RCC_APB1Periph_SPI3: SPI3 clock
  • RCC_APB1Periph_USART2: USART2 clock
  • RCC_APB1Periph_USART3: USART3 clock
  • RCC_APB1Periph_UART4: UART4 clock
  • RCC_APB1Periph_UART5: UART5 clock
  • RCC_APB1Periph_I2C1: I2C1 clock
  • RCC_APB1Periph_I2C2: I2C2 clock
  • RCC_APB1Periph_I2C3: I2C3 clock
  • RCC_APB1Periph_CAN1: CAN1 clock
  • RCC_APB1Periph_CAN2: CAN2 clock
  • RCC_APB1Periph_PWR: PWR clock
  • RCC_APB1Periph_DAC: DAC clock
  • RCC_APB1Periph_UART7: UART7 clock
  • RCC_APB1Periph_UART8: UART8 clock
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2
  • RCC_APB1Periph_TIM3
  • RCC_APB1Periph_TIM4
  • RCC_APB1Periph_TIM6
  • RCC_APB1Periph_TIM7
  • RCC_APB1Periph_WWDG
  • RCC_APB1Periph_SPI2
  • RCC_APB1Periph_SPI3
  • RCC_APB1Periph_USART2
  • RCC_APB1Periph_USART3
  • RCC_APB1Periph_UART4
  • RCC_APB1Periph_UART5
  • RCC_APB1Periph_I2C1
  • RCC_APB1Periph_I2C2
  • RCC_APB1Periph_USB
  • RCC_APB1Periph_CAN1
  • RCC_APB1Periph_PWR
  • RCC_APB1Periph_DAC1
  • RCC_APB1Periph_DAC2
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2, RCC_APB1Periph_TIM3, RCC_APB1Periph_TIM4, RCC_APB1Periph_TIM5, RCC_APB1Periph_TIM6, RCC_APB1Periph_TIM7, RCC_APB1Periph_WWDG, RCC_APB1Periph_SPI2, RCC_APB1Periph_SPI3, RCC_APB1Periph_USART2, RCC_APB1Periph_USART3, RCC_APB1Periph_USART4, RCC_APB1Periph_USART5, RCC_APB1Periph_I2C1, RCC_APB1Periph_I2C2, RCC_APB1Periph_USB, RCC_APB1Periph_CAN1, RCC_APB1Periph_BKP, RCC_APB1Periph_PWR, RCC_APB1Periph_DAC, RCC_APB1Periph_CEC, RCC_APB1Periph_TIM12, RCC_APB1Periph_TIM13, RCC_APB1Periph_TIM14
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 2004 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_APB1PeriphResetCmd ( uint32_t  RCC_APB1Periph,
FunctionalState  NewState 
)

Forces or releases Low Speed APB (APB1) peripheral reset.

Parameters
RCC_APB1Periphspecifies the APB1 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2: TIM2 clock
  • RCC_APB1Periph_TIM3: TIM3 clock
  • RCC_APB1Periph_TIM4: TIM4 clock
  • RCC_APB1Periph_TIM5: TIM5 clock
  • RCC_APB1Periph_TIM6: TIM6 clock
  • RCC_APB1Periph_TIM7: TIM7 clock
  • RCC_APB1Periph_TIM12: TIM12 clock
  • RCC_APB1Periph_TIM13: TIM13 clock
  • RCC_APB1Periph_TIM14: TIM14 clock
  • RCC_APB1Periph_LPTIM1: LPTIM1 clock (STM32F410xx devices)
  • RCC_APB1Periph_WWDG: WWDG clock
  • RCC_APB1Periph_SPI2: SPI2 clock
  • RCC_APB1Periph_SPI3: SPI3 clock
  • RCC_APB1Periph_SPDIF: SPDIF RX clock (STM32F446xx devices)
  • RCC_APB1Periph_USART2: USART2 clock
  • RCC_APB1Periph_USART3: USART3 clock
  • RCC_APB1Periph_UART4: UART4 clock
  • RCC_APB1Periph_UART5: UART5 clock
  • RCC_APB1Periph_I2C1: I2C1 clock
  • RCC_APB1Periph_I2C2: I2C2 clock
  • RCC_APB1Periph_I2C3: I2C3 clock
  • RCC_APB1Periph_FMPI2C1: FMPI2C1 clock
  • RCC_APB1Periph_CAN1: CAN1 clock
  • RCC_APB1Periph_CAN2: CAN2 clock
  • RCC_APB1Periph_CEC: CEC clock(STM32F446xx devices)
  • RCC_APB1Periph_PWR: PWR clock
  • RCC_APB1Periph_DAC: DAC clock
  • RCC_APB1Periph_UART7: UART7 clock
  • RCC_APB1Periph_UART8: UART8 clock
NewStatenew state of the specified peripheral reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2: TIM2 clock
  • RCC_APB1Periph_TIM3: TIM3 clock
  • RCC_APB1Periph_TIM4: TIM4 clock
  • RCC_APB1Periph_TIM5: TIM5 clock
  • RCC_APB1Periph_TIM6: TIM6 clock
  • RCC_APB1Periph_TIM7: TIM7 clock
  • RCC_APB1Periph_TIM12: TIM12 clock
  • RCC_APB1Periph_TIM13: TIM13 clock
  • RCC_APB1Periph_TIM14: TIM14 clock
  • RCC_APB1Periph_WWDG: WWDG clock
  • RCC_APB1Periph_SPI2: SPI2 clock
  • RCC_APB1Periph_SPI3: SPI3 clock
  • RCC_APB1Periph_USART2: USART2 clock
  • RCC_APB1Periph_USART3: USART3 clock
  • RCC_APB1Periph_UART4: UART4 clock
  • RCC_APB1Periph_UART5: UART5 clock
  • RCC_APB1Periph_I2C1: I2C1 clock
  • RCC_APB1Periph_I2C2: I2C2 clock
  • RCC_APB1Periph_I2C3: I2C3 clock
  • RCC_APB1Periph_CAN1: CAN1 clock
  • RCC_APB1Periph_CAN2: CAN2 clock
  • RCC_APB1Periph_PWR: PWR clock
  • RCC_APB1Periph_DAC: DAC clock
  • RCC_APB1Periph_UART7: UART7 clock
  • RCC_APB1Periph_UART8: UART8 clock
NewStatenew state of the specified peripheral reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2
  • RCC_APB1Periph_TIM3
  • RCC_APB1Periph_TIM4
  • RCC_APB1Periph_TIM6
  • RCC_APB1Periph_TIM7
  • RCC_APB1Periph_WWDG
  • RCC_APB1Periph_SPI2
  • RCC_APB1Periph_SPI3
  • RCC_APB1Periph_USART2
  • RCC_APB1Periph_USART3
  • RCC_APB1Periph_UART4
  • RCC_APB1Periph_UART5
  • RCC_APB1Periph_I2C1
  • RCC_APB1Periph_I2C2
  • RCC_APB1Periph_I2C3
  • RCC_APB1Periph_USB
  • RCC_APB1Periph_CAN1
  • RCC_APB1Periph_PWR
  • RCC_APB1Periph_DAC
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB1Periphspecifies the APB1 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB1Periph_TIM2, RCC_APB1Periph_TIM3, RCC_APB1Periph_TIM4, RCC_APB1Periph_TIM5, RCC_APB1Periph_TIM6, RCC_APB1Periph_TIM7, RCC_APB1Periph_WWDG, RCC_APB1Periph_SPI2, RCC_APB1Periph_SPI3, RCC_APB1Periph_USART2, RCC_APB1Periph_USART3, RCC_APB1Periph_USART4, RCC_APB1Periph_USART5, RCC_APB1Periph_I2C1, RCC_APB1Periph_I2C2, RCC_APB1Periph_USB, RCC_APB1Periph_CAN1, RCC_APB1Periph_BKP, RCC_APB1Periph_PWR, RCC_APB1Periph_DAC, RCC_APB1Periph_CEC, RCC_APB1Periph_TIM12, RCC_APB1Periph_TIM13, RCC_APB1Periph_TIM14
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 2204 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_APB2PeriphClockCmd ( uint32_t  RCC_APB2Periph,
FunctionalState  NewState 
)

Enables or disables the High Speed APB (APB2) peripheral clock.

Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB2Periph_TIM1: TIM1 clock
  • RCC_APB2Periph_TIM8: TIM8 clock
  • RCC_APB2Periph_USART1: USART1 clock
  • RCC_APB2Periph_USART6: USART6 clock
  • RCC_APB2Periph_ADC1: ADC1 clock
  • RCC_APB2Periph_ADC2: ADC2 clock
  • RCC_APB2Periph_ADC3: ADC3 clock
  • RCC_APB2Periph_SDIO: SDIO clock
  • RCC_APB2Periph_SPI1: SPI1 clock
  • RCC_APB2Periph_SPI4: SPI4 clock
  • RCC_APB2Periph_SYSCFG: SYSCFG clock
  • RCC_APB2Periph_TIM9: TIM9 clock
  • RCC_APB2Periph_TIM10: TIM10 clock
  • RCC_APB2Periph_TIM11: TIM11 clock
  • RCC_APB2Periph_SPI5: SPI5 clock
  • RCC_APB2Periph_SPI6: SPI6 clock
  • RCC_APB2Periph_SAI1: SAI1 clock (STM32F42xxx/43xxx/446xx/469xx/479xx devices)
  • RCC_APB2Periph_SAI2: SAI2 clock (STM32F446xx devices)
  • RCC_APB2Periph_LTDC: LTDC clock (STM32F429xx/439xx devices)
  • RCC_APB2Periph_DSI: DSI clock (STM32F469_479xx devices)
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB2Periph_TIM1: TIM1 clock
  • RCC_APB2Periph_TIM8: TIM8 clock
  • RCC_APB2Periph_USART1: USART1 clock
  • RCC_APB2Periph_USART6: USART6 clock
  • RCC_APB2Periph_ADC1: ADC1 clock
  • RCC_APB2Periph_ADC2: ADC2 clock
  • RCC_APB2Periph_ADC3: ADC3 clock
  • RCC_APB2Periph_SDIO: SDIO clock
  • RCC_APB2Periph_SPI1: SPI1 clock
  • RCC_APB2Periph_SPI4: SPI4 clock
  • RCC_APB2Periph_SYSCFG: SYSCFG clock
  • RCC_APB2Periph_TIM9: TIM9 clock
  • RCC_APB2Periph_TIM10: TIM10 clock
  • RCC_APB2Periph_TIM11: TIM11 clock
  • RCC_APB2Periph_SPI5: SPI5 clock
  • RCC_APB2Periph_SPI6: SPI6 clock
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
After reset, the peripheral clock (used for registers read/write access) is disabled and the application software has to enable this clock before using it.
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB2Periph_SYSCFG
  • RCC_APB2Periph_SPI1
  • RCC_APB2Periph_USART1
  • RCC_APB2Periph_TIM15
  • RCC_APB2Periph_TIM16
  • RCC_APB2Periph_TIM17
  • RCC_APB2Periph_TIM1
  • RCC_APB2Periph_TIM8
  • RCC_APB2Periph_HRTIM1
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to gates its clock. This parameter can be any combination of the following values:
  • RCC_APB2Periph_AFIO, RCC_APB2Periph_GPIOA, RCC_APB2Periph_GPIOB, RCC_APB2Periph_GPIOC, RCC_APB2Periph_GPIOD, RCC_APB2Periph_GPIOE, RCC_APB2Periph_GPIOF, RCC_APB2Periph_GPIOG, RCC_APB2Periph_ADC1, RCC_APB2Periph_ADC2, RCC_APB2Periph_TIM1, RCC_APB2Periph_SPI1, RCC_APB2Periph_TIM8, RCC_APB2Periph_USART1, RCC_APB2Periph_ADC3, RCC_APB2Periph_TIM15, RCC_APB2Periph_TIM16, RCC_APB2Periph_TIM17, RCC_APB2Periph_TIM9, RCC_APB2Periph_TIM10, RCC_APB2Periph_TIM11
NewStatenew state of the specified peripheral clock. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 2051 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_APB2PeriphResetCmd ( uint32_t  RCC_APB2Periph,
FunctionalState  NewState 
)

Forces or releases High Speed APB (APB2) peripheral reset.

Parameters
RCC_APB2Periphspecifies the APB2 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB2Periph_TIM1: TIM1 clock
  • RCC_APB2Periph_TIM8: TIM8 clock
  • RCC_APB2Periph_USART1: USART1 clock
  • RCC_APB2Periph_USART6: USART6 clock
  • RCC_APB2Periph_ADC1: ADC1 clock
  • RCC_APB2Periph_ADC2: ADC2 clock
  • RCC_APB2Periph_ADC3: ADC3 clock
  • RCC_APB2Periph_SDIO: SDIO clock
  • RCC_APB2Periph_SPI1: SPI1 clock
  • RCC_APB2Periph_SPI4: SPI4 clock
  • RCC_APB2Periph_SYSCFG: SYSCFG clock
  • RCC_APB2Periph_TIM9: TIM9 clock
  • RCC_APB2Periph_TIM10: TIM10 clock
  • RCC_APB2Periph_TIM11: TIM11 clock
  • RCC_APB2Periph_SPI5: SPI5 clock
  • RCC_APB2Periph_SPI6: SPI6 clock
  • RCC_APB2Periph_SAI1: SAI1 clock (STM32F42xxx/43xxx/446xx/469xx/479xx devices)
  • RCC_APB2Periph_SAI2: SAI2 clock (STM32F446xx devices)
  • RCC_APB2Periph_LTDC: LTDC clock (STM32F429xx/439xx devices)
  • RCC_APB2Periph_DSI: DSI clock (STM32F469_479xx devices)
NewStatenew state of the specified peripheral reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB2Periph_TIM1: TIM1 clock
  • RCC_APB2Periph_TIM8: TIM8 clock
  • RCC_APB2Periph_USART1: USART1 clock
  • RCC_APB2Periph_USART6: USART6 clock
  • RCC_APB2Periph_ADC1: ADC1 clock
  • RCC_APB2Periph_ADC2: ADC2 clock
  • RCC_APB2Periph_ADC3: ADC3 clock
  • RCC_APB2Periph_SDIO: SDIO clock
  • RCC_APB2Periph_SPI1: SPI1 clock
  • RCC_APB2Periph_SPI4: SPI4 clock
  • RCC_APB2Periph_SYSCFG: SYSCFG clock
  • RCC_APB2Periph_TIM9: TIM9 clock
  • RCC_APB2Periph_TIM10: TIM10 clock
  • RCC_APB2Periph_TIM11: TIM11 clock
  • RCC_APB2Periph_SPI5: SPI5 clock
  • RCC_APB2Periph_SPI6: SPI6 clock
NewStatenew state of the specified peripheral reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB2Periph_SYSCFG
  • RCC_APB2Periph_SPI1
  • RCC_APB2Periph_USART1
  • RCC_APB2Periph_TIM15
  • RCC_APB2Periph_TIM16
  • RCC_APB2Periph_TIM17
  • RCC_APB2Periph_TIM1
  • RCC_APB2Periph_TIM8
  • RCC_APB2Periph_HRTIM1
NewStatenew state of the specified peripheral reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_APB2Periphspecifies the APB2 peripheral to reset. This parameter can be any combination of the following values:
  • RCC_APB2Periph_AFIO, RCC_APB2Periph_GPIOA, RCC_APB2Periph_GPIOB, RCC_APB2Periph_GPIOC, RCC_APB2Periph_GPIOD, RCC_APB2Periph_GPIOE, RCC_APB2Periph_GPIOF, RCC_APB2Periph_GPIOG, RCC_APB2Periph_ADC1, RCC_APB2Periph_ADC2, RCC_APB2Periph_TIM1, RCC_APB2Periph_SPI1, RCC_APB2Periph_TIM8, RCC_APB2Periph_USART1, RCC_APB2Periph_ADC3, RCC_APB2Periph_TIM15, RCC_APB2Periph_TIM16, RCC_APB2Periph_TIM17, RCC_APB2Periph_TIM9, RCC_APB2Periph_TIM10, RCC_APB2Periph_TIM11
NewStatenew state of the specified peripheral reset. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 2247 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_BackupResetCmd ( FunctionalState  NewState)

Forces or releases the Backup domain reset.

Note
This function resets the RTC peripheral (including the backup registers) and the RTC clock source selection in RCC_CSR register.
The BKPSRAM is not affected by this reset.
Parameters
NewStatenew state of the Backup domain reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
This function resets the RTC peripheral (including the backup registers) and the RTC clock source selection in RCC_BDCR register.
Parameters
NewStatenew state of the Backup domain reset. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
NewStatenew state of the Backup domain reset. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 1519 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_ClearFlag ( void  )

Clears the RCC reset flags. The reset flags are: RCC_FLAG_PINRST, RCC_FLAG_PORRST, RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST.

Clears the RCC reset flags. The reset flags are: RCC_FLAG_OBLRST, RCC_FLAG_PINRST, RCC_FLAG_PORRST, RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST.

Parameters
None
Return values
NoneClears the RCC reset flags. The reset flags are: RCC_FLAG_PINRST, RCC_FLAG_PORRST, RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST.
Note
The reset flags are: RCC_FLAG_PINRST, RCC_FLAG_PORRST, RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST
Parameters
None
Return values
None

Definition at line 2870 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_ClearITPendingBit ( uint8_t  RCC_IT)

Clears the RCC's interrupt pending bits.

Parameters
RCC_ITspecifies the interrupt pending bit to clear. This parameter can be any combination of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: main PLL ready interrupt
  • RCC_IT_PLLI2SRDY: PLLI2S ready interrupt
  • RCC_IT_PLLSAIRDY: PLLSAI ready interrupt (only for STM32F42xxx/43xxx/446xx/469xx/479xx devices)
  • RCC_IT_CSS: Clock Security System interrupt
Return values
None
Parameters
RCC_ITspecifies the interrupt pending bit to clear. This parameter can be any combination of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: main PLL ready interrupt
  • RCC_IT_PLLI2SRDY: PLLI2S ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt
Return values
None
Parameters
RCC_ITspecifies the interrupt pending bit to clear. This parameter can be any combination of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt
Return values
None
Parameters
RCC_ITspecifies the interrupt pending bit to clear.

For STM32_Connectivity_line_devices, this parameter can be any combination of the following values:

  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_PLL2RDY: PLL2 ready interrupt
  • RCC_IT_PLL3RDY: PLL3 ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt

For other_STM32_devices, this parameter can be any combination of the following values:

  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt
    Return values
    None

Definition at line 2924 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_ClockSecuritySystemCmd ( FunctionalState  NewState)

Enables or disables the Clock Security System.

Note
If a failure is detected on the HSE oscillator clock, this oscillator is automatically disabled and an interrupt is generated to inform the software about the failure (Clock Security System Interrupt, CSSI), allowing the MCU to perform rescue operations. The CSSI is linked to the Cortex-M4 NMI (Non-Maskable Interrupt) exception vector.
Parameters
NewStatenew state of the Clock Security System. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
NewStatenew state of the Clock Security System.. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 879 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_DeInit ( void  )

Resets the RCC clock configuration to the default reset state.

Note
The default reset state of the clock configuration is given below:
  • HSI ON and used as system clock source
  • HSE, PLL and PLLI2S OFF
  • AHB, APB1 and APB2 prescaler set to 1.
  • CSS, MCO1 and MCO2 OFF
  • All interrupts disabled
This function doesn't modify the configuration of the
  • Peripheral clocks
  • LSI, LSE and RTC clocks
Parameters
None
Return values
None
Note
The default reset state of the clock configuration is given below:
HSI ON and used as system clock source
HSE and PLL OFF
AHB, APB1 and APB2 prescalers set to 1.
CSS and MCO OFF
All interrupts disabled
However, this function doesn't modify the configuration of the
Peripheral clocks
LSI, LSE and RTC clocks
Parameters
None
Return values
None
Parameters
None
Return values
None

Definition at line 225 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_GetClocksFreq ( RCC_ClocksTypeDef RCC_Clocks)

Returns the frequencies of different on chip clocks; SYSCLK, HCLK, PCLK1 and PCLK2.

Returns the frequencies of the System, AHB, APB2 and APB1 busses clocks.

Note
The system frequency computed by this function is not the real frequency in the chip. It is calculated based on the predefined constant and the selected clock source:
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 stm32f4xx.h 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 stm32f4xx.h 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 not correct when using fractional value for HSE crystal.
Parameters
RCC_Clockspointer to a RCC_ClocksTypeDef structure which will hold the clocks frequencies.
Note
This function can be used by the user application to compute the baudrate for the communication peripherals or configure other parameters.
Each time SYSCLK, HCLK, PCLK1 and/or PCLK2 clock changes, this function must be called to update the structure's field. Otherwise, any configuration based on this function will be incorrect.
Return values
None
Note
This function returns the frequencies of : System, AHB, APB2 and APB1 busses clocks, ADC1/2/3/4 clocks, USART1/2/3/4/5 clocks, I2C1/2 clocks and TIM1/8 Clocks.
The frequency returned by this function is not the real frequency in the chip. It is calculated based on the predefined constant and the source selected by RCC_SYSCLKConfig().
If SYSCLK source is HSI, function returns constant HSI_VALUE(*)
If SYSCLK source is HSE, function returns constant HSE_VALUE(**)
If SYSCLK source is PLL, function returns constant HSE_VALUE(**) or HSI_VALUE(*) multiplied by the PLL factors.
(*) HSI_VALUE is a constant defined in stm32f30x.h file (default value 8 MHz) but the real value may vary depending on the variations in voltage and temperature, refer to RCC_AdjustHSICalibrationValue().
(**) HSE_VALUE is a constant defined in stm32f30x.h 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 return wrong result.
The result of this function could be not correct when using fractional value for HSE crystal.
Parameters
RCC_Clockspointer to a RCC_ClocksTypeDef structure which will hold the clocks frequencies.
Note
This function can be used by the user application to compute the baudrate for the communication peripherals or configure other parameters.
Each time SYSCLK, HCLK, PCLK1 and/or PCLK2 clock changes, this function must be called to update the structure's field. Otherwise, any configuration based on this function will be incorrect.
Return values
NoneReturns the frequencies of different on chip clocks; SYSCLK, HCLK, PCLK1 and PCLK2.
Parameters
RCC_Clockspointer to a RCC_ClocksTypeDef structure which will hold the clocks frequencies.
Note
The result of this function could be not correct when using fractional value for HSE crystal.
Return values
None

Definition at line 1317 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

FlagStatus RCC_GetFlagStatus ( uint8_t  RCC_FLAG)

Checks whether the specified RCC flag is set or not.

Parameters
RCC_FLAGspecifies the flag to check. This parameter can be one of the following values:
  • RCC_FLAG_HSIRDY: HSI oscillator clock ready
  • RCC_FLAG_HSERDY: HSE oscillator clock ready
  • RCC_FLAG_PLLRDY: main PLL clock ready
  • RCC_FLAG_PLLI2SRDY: PLLI2S clock ready
  • RCC_FLAG_PLLSAIRDY: PLLSAI clock ready (only for STM32F42xxx/43xxx/446xx/469xx/479xx devices)
  • RCC_FLAG_LSERDY: LSE oscillator clock ready
  • RCC_FLAG_LSIRDY: LSI oscillator clock ready
  • RCC_FLAG_BORRST: POR/PDR or BOR reset
  • RCC_FLAG_PINRST: Pin reset
  • RCC_FLAG_PORRST: POR/PDR reset
  • RCC_FLAG_SFTRST: Software reset
  • RCC_FLAG_IWDGRST: Independent Watchdog reset
  • RCC_FLAG_WWDGRST: Window Watchdog reset
  • RCC_FLAG_LPWRRST: Low Power reset
Return values
Thenew state of RCC_FLAG (SET or RESET).
Parameters
RCC_FLAGspecifies the flag to check. This parameter can be one of the following values:
  • RCC_FLAG_HSIRDY: HSI oscillator clock ready
  • RCC_FLAG_HSERDY: HSE oscillator clock ready
  • RCC_FLAG_PLLRDY: main PLL clock ready
  • RCC_FLAG_PLLI2SRDY: PLLI2S clock ready
  • RCC_FLAG_LSERDY: LSE oscillator clock ready
  • RCC_FLAG_LSIRDY: LSI oscillator clock ready
  • RCC_FLAG_BORRST: POR/PDR or BOR reset
  • RCC_FLAG_PINRST: Pin reset
  • RCC_FLAG_PORRST: POR/PDR reset
  • RCC_FLAG_SFTRST: Software reset
  • RCC_FLAG_IWDGRST: Independent Watchdog reset
  • RCC_FLAG_WWDGRST: Window Watchdog reset
  • RCC_FLAG_LPWRRST: Low Power reset
Return values
Thenew state of RCC_FLAG (SET or RESET).
Parameters
RCC_FLAGspecifies the flag to check. This parameter can be one of the following values:
  • RCC_FLAG_HSIRDY: HSI oscillator clock ready
  • RCC_FLAG_HSERDY: HSE oscillator clock ready
  • RCC_FLAG_PLLRDY: PLL clock ready
  • RCC_FLAG_MCOF: MCO Flag
  • RCC_FLAG_LSERDY: LSE oscillator clock ready
  • RCC_FLAG_LSIRDY: LSI oscillator clock ready
  • RCC_FLAG_OBLRST: Option Byte Loader (OBL) reset
  • RCC_FLAG_PINRST: Pin reset
  • RCC_FLAG_PORRST: POR/PDR reset
  • RCC_FLAG_SFTRST: Software reset
  • RCC_FLAG_IWDGRST: Independent Watchdog reset
  • RCC_FLAG_WWDGRST: Window Watchdog reset
  • RCC_FLAG_LPWRRST: Low Power reset
Return values
Thenew state of RCC_FLAG (SET or RESET).
Parameters
RCC_FLAGspecifies the flag to check.

For STM32_Connectivity_line_devices, this parameter can be one of the following values:

  • RCC_FLAG_HSIRDY: HSI oscillator clock ready
  • RCC_FLAG_HSERDY: HSE oscillator clock ready
  • RCC_FLAG_PLLRDY: PLL clock ready
  • RCC_FLAG_PLL2RDY: PLL2 clock ready
  • RCC_FLAG_PLL3RDY: PLL3 clock ready
  • RCC_FLAG_LSERDY: LSE oscillator clock ready
  • RCC_FLAG_LSIRDY: LSI oscillator clock ready
  • RCC_FLAG_PINRST: Pin reset
  • RCC_FLAG_PORRST: POR/PDR reset
  • RCC_FLAG_SFTRST: Software reset
  • RCC_FLAG_IWDGRST: Independent Watchdog reset
  • RCC_FLAG_WWDGRST: Window Watchdog reset
  • RCC_FLAG_LPWRRST: Low Power reset

For other_STM32_devices, this parameter can be one of the following values:

  • RCC_FLAG_HSIRDY: HSI oscillator clock ready
  • RCC_FLAG_HSERDY: HSE oscillator clock ready
  • RCC_FLAG_PLLRDY: PLL clock ready
  • RCC_FLAG_LSERDY: LSE oscillator clock ready
  • RCC_FLAG_LSIRDY: LSI oscillator clock ready
  • RCC_FLAG_PINRST: Pin reset
  • RCC_FLAG_PORRST: POR/PDR reset
  • RCC_FLAG_SFTRST: Software reset
  • RCC_FLAG_IWDGRST: Independent Watchdog reset
  • RCC_FLAG_WWDGRST: Window Watchdog reset
  • RCC_FLAG_LPWRRST: Low Power reset
Return values
Thenew state of RCC_FLAG (SET or RESET).

Definition at line 2825 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

ITStatus RCC_GetITStatus ( uint8_t  RCC_IT)

Checks whether the specified RCC interrupt has occurred or not.

Parameters
RCC_ITspecifies the RCC interrupt source to check. This parameter can be one of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: main PLL ready interrupt
  • RCC_IT_PLLI2SRDY: PLLI2S ready interrupt
  • RCC_IT_PLLSAIRDY: PLLSAI clock ready interrupt (only for STM32F42xxx/43xxx/446xx/469xx/479xx devices)
  • RCC_IT_CSS: Clock Security System interrupt
Return values
Thenew state of RCC_IT (SET or RESET).
Parameters
RCC_ITspecifies the RCC interrupt source to check. This parameter can be one of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: main PLL ready interrupt
  • RCC_IT_PLLI2SRDY: PLLI2S ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt
Return values
Thenew state of RCC_IT (SET or RESET).
Parameters
RCC_ITspecifies the RCC interrupt source to check. This parameter can be one of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt
Return values
Thenew state of RCC_IT (SET or RESET).
Parameters
RCC_ITspecifies the RCC interrupt source to check.

For STM32_Connectivity_line_devices, this parameter can be one of the following values:

  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_PLL2RDY: PLL2 ready interrupt
  • RCC_IT_PLL3RDY: PLL3 ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt

For other_STM32_devices, this parameter can be one of the following values:

  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_CSS: Clock Security System interrupt
Return values
Thenew state of RCC_IT (SET or RESET).

Definition at line 2890 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

uint8_t RCC_GetSYSCLKSource ( void  )

Returns the clock source used as system clock.

Parameters
None
Return values
Theclock source used as system clock. The returned value can be one of the following:
  • 0x00: HSI used as system clock
  • 0x04: HSE used as system clock
  • 0x08: PLL used as system clock (PLL P for STM32F446xx devices)
  • 0x0C: PLL R used as system clock (only for STM32F446xx devices)
Parameters
None
Return values
Theclock source used as system clock. The returned value can be one of the following:
  • 0x00: HSI used as system clock
  • 0x04: HSE used as system clock
  • 0x08: PLL used as system clock
Parameters
None
Return values
Theclock source used as system clock. The returned value can be one of the following values:
  • 0x00: HSI used as system clock
  • 0x04: HSE used as system clock
  • 0x08: PLL used as system clock
Parameters
None
Return values
Theclock source used as system clock. The returned value can be one of the following:
  • 0x00: HSI used as system clock
  • 0x04: HSE used as system clock
  • 0x08: PLL used as system clock

Definition at line 1178 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_HCLKConfig ( uint32_t  RCC_SYSCLK)

Configures the AHB clock (HCLK).

Note
Depending on the device voltage range, the software has to set correctly these bits to ensure that HCLK not exceed the maximum allowed frequency (for more details refer to section above "CPU, AHB and APB busses clocks configuration functions")
Parameters
RCC_SYSCLKdefines the AHB clock divider. This clock is derived from the system clock (SYSCLK). This parameter can be one of the following values:
  • RCC_SYSCLK_Div1: AHB clock = SYSCLK
  • RCC_SYSCLK_Div2: AHB clock = SYSCLK/2
  • RCC_SYSCLK_Div4: AHB clock = SYSCLK/4
  • RCC_SYSCLK_Div8: AHB clock = SYSCLK/8
  • RCC_SYSCLK_Div16: AHB clock = SYSCLK/16
  • RCC_SYSCLK_Div64: AHB clock = SYSCLK/64
  • RCC_SYSCLK_Div128: AHB clock = SYSCLK/128
  • RCC_SYSCLK_Div256: AHB clock = SYSCLK/256
  • RCC_SYSCLK_Div512: AHB clock = SYSCLK/512
Return values
None
Note
Depending on the device voltage range, the software has to set correctly these bits to ensure that the system frequency does not exceed the maximum allowed frequency (for more details refer to section above "CPU, AHB and APB busses clocks configuration functions").
Parameters
RCC_SYSCLKdefines the AHB clock divider. This clock is derived from the system clock (SYSCLK). This parameter can be one of the following values:
  • RCC_SYSCLK_Div1: AHB clock = SYSCLK
  • RCC_SYSCLK_Div2: AHB clock = SYSCLK/2
  • RCC_SYSCLK_Div4: AHB clock = SYSCLK/4
  • RCC_SYSCLK_Div8: AHB clock = SYSCLK/8
  • RCC_SYSCLK_Div16: AHB clock = SYSCLK/16
  • RCC_SYSCLK_Div64: AHB clock = SYSCLK/64
  • RCC_SYSCLK_Div128: AHB clock = SYSCLK/128
  • RCC_SYSCLK_Div256: AHB clock = SYSCLK/256
  • RCC_SYSCLK_Div512: AHB clock = SYSCLK/512
Return values
None
Parameters
RCC_SYSCLKdefines the AHB clock divider. This clock is derived from the system clock (SYSCLK). This parameter can be one of the following values:
  • RCC_SYSCLK_Div1: AHB clock = SYSCLK
  • RCC_SYSCLK_Div2: AHB clock = SYSCLK/2
  • RCC_SYSCLK_Div4: AHB clock = SYSCLK/4
  • RCC_SYSCLK_Div8: AHB clock = SYSCLK/8
  • RCC_SYSCLK_Div16: AHB clock = SYSCLK/16
  • RCC_SYSCLK_Div64: AHB clock = SYSCLK/64
  • RCC_SYSCLK_Div128: AHB clock = SYSCLK/128
  • RCC_SYSCLK_Div256: AHB clock = SYSCLK/256
  • RCC_SYSCLK_Div512: AHB clock = SYSCLK/512
Return values
None

Definition at line 1203 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_HSEConfig ( uint32_t  RCC_HSE)

Configures the External High Speed oscillator (HSE).

Note
HSE can not be stopped if it is used directly or through the PLL as system clock.
Parameters
RCC_HSEspecifies the new state of the HSE. This parameter can be one of the following values:
  • RCC_HSE_OFF: HSE oscillator OFF
  • RCC_HSE_ON: HSE oscillator ON
  • RCC_HSE_Bypass: HSE oscillator bypassed with external clock
Return values
None

Definition at line 271 of file stm32f10x_rcc.c.

void RCC_HSICmd ( FunctionalState  NewState)

Enables or disables the Internal High Speed oscillator (HSI).

Note
The HSI is stopped by hardware when entering STOP and STANDBY modes. It is used (enabled by hardware) as system clock source after startup from Reset, wakeup from STOP and STANDBY mode, or in case of failure of the HSE used directly or indirectly as system clock (if the Clock Security System CSS is enabled).
HSI can not be stopped if it is used as system clock source. In this case, you have to select another source of the system clock then stop the HSI.
After enabling the HSI, the application software should wait on HSIRDY flag to be set indicating that HSI clock is stable and can be used as system clock source.
Parameters
NewStatenew state of the HSI. This parameter can be: ENABLE or DISABLE.
Note
When the HSI is stopped, HSIRDY flag goes low after 6 HSI oscillator clock cycles.
Return values
None
Note
After enabling the HSI, the application software should wait on HSIRDY flag to be set indicating that HSI clock is stable and can be used to clock the PLL and/or system clock.
HSI can not be stopped if it is used directly or through the PLL as system clock. In this case, you have to select another source of the system clock then stop the HSI.
The HSI is stopped by hardware when entering STOP and STANDBY modes.
When the HSI is stopped, HSIRDY flag goes low after 6 HSI oscillator clock cycles.
Parameters
NewStatenew state of the HSI. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
HSI can not be stopped if it is used directly or through the PLL as system clock.
Parameters
NewStatenew state of the HSI. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 375 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_ITConfig ( uint8_t  RCC_IT,
FunctionalState  NewState 
)

Enables or disables the specified RCC interrupts.

Parameters
RCC_ITspecifies the RCC interrupt sources to be enabled or disabled. This parameter can be any combination of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: main PLL ready interrupt
  • RCC_IT_PLLI2SRDY: PLLI2S ready interrupt
  • RCC_IT_PLLSAIRDY: PLLSAI ready interrupt (only for STM32F42xxx/43xxx/446xx/469xx/479xx devices)
NewStatenew state of the specified RCC interrupts. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_ITspecifies the RCC interrupt sources to be enabled or disabled. This parameter can be any combination of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: main PLL ready interrupt
  • RCC_IT_PLLI2SRDY: PLLI2S ready interrupt
NewStatenew state of the specified RCC interrupts. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
The CSS interrupt doesn't have an enable bit; once the CSS is enabled and if the HSE clock fails, the CSS interrupt occurs and an NMI is automatically generated. The NMI will be executed indefinitely, and since NMI has higher priority than any other IRQ (and main program) the application will be stacked in the NMI ISR unless the CSS interrupt pending bit is cleared.
Parameters
RCC_ITspecifies the RCC interrupt sources to be enabled or disabled. This parameter can be any combination of the following values:
  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
NewStatenew state of the specified RCC interrupts. This parameter can be: ENABLE or DISABLE.
Return values
None
Parameters
RCC_ITspecifies the RCC interrupt sources to be enabled or disabled.

For STM32_Connectivity_line_devices, this parameter can be any combination of the following values

  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
  • RCC_IT_PLL2RDY: PLL2 ready interrupt
  • RCC_IT_PLL3RDY: PLL3 ready interrupt

For other_STM32_devices, this parameter can be any combination of the following values

  • RCC_IT_LSIRDY: LSI ready interrupt
  • RCC_IT_LSERDY: LSE ready interrupt
  • RCC_IT_HSIRDY: HSI ready interrupt
  • RCC_IT_HSERDY: HSE ready interrupt
  • RCC_IT_PLLRDY: PLL ready interrupt
Parameters
NewStatenew state of the specified RCC interrupts. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 2788 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_LSEConfig ( uint8_t  RCC_LSE)

Configures the External Low Speed oscillator (LSE).

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 PWR_BackupAccessCmd(ENABLE) function before to configure the LSE (to be done once after reset).
After enabling the LSE (RCC_LSE_ON or RCC_LSE_Bypass), the application software should wait on LSERDY flag to be set indicating that LSE clock is stable and can be used to clock the RTC.
Parameters
RCC_LSEspecifies the new state of the LSE. This parameter can be one of the following values:
  • RCC_LSE_OFF: turn OFF the LSE oscillator, LSERDY flag goes low after 6 LSE oscillator clock cycles.
  • RCC_LSE_ON: turn ON the LSE oscillator
  • RCC_LSE_Bypass: LSE oscillator bypassed with external clock
Return values
None
Parameters
RCC_LSEspecifies the new state of the LSE. This parameter can be one of the following values:
  • RCC_LSE_OFF: LSE oscillator OFF
  • RCC_LSE_ON: LSE oscillator ON
  • RCC_LSE_Bypass: LSE oscillator bypassed with external clock
Return values
None

Definition at line 400 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_LSICmd ( FunctionalState  NewState)

Enables or disables the Internal Low Speed oscillator (LSI).

Note
After enabling the LSI, the application software should wait on LSIRDY flag to be set indicating that LSI clock is stable and can be used to clock the IWDG and/or the RTC.
LSI can not be disabled if the IWDG is running.
Parameters
NewStatenew state of the LSI. This parameter can be: ENABLE or DISABLE.
Note
When the LSI is stopped, LSIRDY flag goes low after 6 LSI oscillator clock cycles.
Return values
None
Note
After enabling the LSI, the application software should wait on LSIRDY flag to be set indicating that LSI clock is stable and can be used to clock the IWDG and/or the RTC.
LSI can not be disabled if the IWDG is running.
When the LSI is stopped, LSIRDY flag goes low after 6 LSI oscillator clock cycles.
Parameters
NewStatenew state of the LSI. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
LSI can not be disabled if the IWDG is running.
Parameters
NewStatenew state of the LSI. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 440 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_MCOConfig ( uint8_t  RCC_MCO)

Selects the clock source to output on MCO pin.

Parameters
RCC_MCOspecifies the clock source to output.

For STM32_Connectivity_line_devices, this parameter can be one of the following values:

  • RCC_MCO_NoClock: No clock selected
  • RCC_MCO_SYSCLK: System clock selected
  • RCC_MCO_HSI: HSI oscillator clock selected
  • RCC_MCO_HSE: HSE oscillator clock selected
  • RCC_MCO_PLLCLK_Div2: PLL clock divided by 2 selected
  • RCC_MCO_PLL2CLK: PLL2 clock selected
  • RCC_MCO_PLL3CLK_Div2: PLL3 clock divided by 2 selected
  • RCC_MCO_XT1: External 3-25 MHz oscillator clock selected
  • RCC_MCO_PLL3CLK: PLL3 clock selected

For other_STM32_devices, this parameter can be one of the following values:

  • RCC_MCO_NoClock: No clock selected
  • RCC_MCO_SYSCLK: System clock selected
  • RCC_MCO_HSI: HSI oscillator clock selected
  • RCC_MCO_HSE: HSE oscillator clock selected
  • RCC_MCO_PLLCLK_Div2: PLL clock divided by 2 selected
Return values
None

Definition at line 1283 of file stm32f10x_rcc.c.

void RCC_PCLK1Config ( uint32_t  RCC_HCLK)

Configures the Low Speed APB clock (PCLK1).

Parameters
RCC_HCLKdefines the APB1 clock divider. This clock is derived from the AHB clock (HCLK). This parameter can be one of the following values:
  • RCC_HCLK_Div1: APB1 clock = HCLK
  • RCC_HCLK_Div2: APB1 clock = HCLK/2
  • RCC_HCLK_Div4: APB1 clock = HCLK/4
  • RCC_HCLK_Div8: APB1 clock = HCLK/8
  • RCC_HCLK_Div16: APB1 clock = HCLK/16
Return values
None

Definition at line 1234 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_PCLK2Config ( uint32_t  RCC_HCLK)

Configures the High Speed APB clock (PCLK2).

Parameters
RCC_HCLKdefines the APB2 clock divider. This clock is derived from the AHB clock (HCLK). This parameter can be one of the following values:
  • RCC_HCLK_Div1: APB2 clock = HCLK
  • RCC_HCLK_Div2: APB2 clock = HCLK/2
  • RCC_HCLK_Div4: APB2 clock = HCLK/4
  • RCC_HCLK_Div8: APB2 clock = HCLK/8
  • RCC_HCLK_Div16: APB2 clock = HCLK/16
Return values
None

Definition at line 1265 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_PLLCmd ( FunctionalState  NewState)

Enables or disables the main PLL.

Enables or disables the PLL.

Note
After enabling the main PLL, the application software should wait on PLLRDY flag to be set indicating that PLL clock is stable and can be used as system clock source.
The main PLL can not be disabled if it is used as system clock source
The main PLL is disabled by hardware when entering STOP and STANDBY modes.
Parameters
NewStatenew state of the main PLL. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
After enabling the PLL, the application software should wait on PLLRDY flag to be set indicating that PLL clock is stable and can be used as system clock source.
The PLL can not be disabled if it is used as system clock source
The PLL is disabled by hardware when entering STOP and STANDBY modes.
Parameters
NewStatenew state of the PLL. This parameter can be: ENABLE or DISABLE.
Return values
NoneEnables or disables the main PLL.
Note
The PLL can not be disabled if it is used as system clock.
Parameters
NewStatenew state of the PLL. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 563 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_PLLConfig ( uint32_t  RCC_PLLSource,
uint32_t  RCC_PLLMul 
)

Configures the PLL clock source and multiplication factor.

Note
This function must be used only when the PLL is disabled.
Parameters
RCC_PLLSourcespecifies the PLL entry clock source. For STM32_Connectivity_line_devices or STM32_Value_line_devices, this parameter can be one of the following values:
  • RCC_PLLSource_HSI_Div2: HSI oscillator clock divided by 2 selected as PLL clock entry
  • RCC_PLLSource_PREDIV1: PREDIV1 clock selected as PLL clock entry For other_STM32_devices, this parameter can be one of the following values:
  • RCC_PLLSource_HSI_Div2: HSI oscillator clock divided by 2 selected as PLL clock entry
  • RCC_PLLSource_HSE_Div1: HSE oscillator clock selected as PLL clock entry
  • RCC_PLLSource_HSE_Div2: HSE oscillator clock divided by 2 selected as PLL clock entry
RCC_PLLMulspecifies the PLL multiplication factor. For STM32_Connectivity_line_devices, this parameter can be RCC_PLLMul_x where x:{[4,9], 6_5} For other_STM32_devices, this parameter can be RCC_PLLMul_x where x:[2,16]
Return values
None
Note
This function must be used only when the PLL is disabled.
The minimum input clock frequency for PLL is 2 MHz (when using HSE as PLL source).
Parameters
RCC_PLLSourcespecifies the PLL entry clock source. This parameter can be one of the following values:
  • RCC_PLLSource_HSI_Div2: HSI oscillator clock divided by 2 selected as PLL clock entry
  • RCC_PLLSource_PREDIV1: PREDIV1 clock selected as PLL clock source
RCC_PLLMulspecifies the PLL multiplication factor, which drive the PLLVCO clock This parameter can be RCC_PLLMul_x where x:[2,16]
Return values
None

Definition at line 379 of file stm32f10x_rcc.c.

void RCC_RTCCLKCmd ( FunctionalState  NewState)

Enables or disables the RTC clock.

Note
This function must be used only after the RTC clock source was selected using the RCC_RTCCLKConfig function.
Parameters
NewStatenew state of the RTC clock. This parameter can be: ENABLE or DISABLE.
Return values
None
Note
This function must be used only after the RTC clock was selected using the RCC_RTCCLKConfig function.
Parameters
NewStatenew state of the RTC clock. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 1502 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_RTCCLKConfig ( uint32_t  RCC_RTCCLKSource)

Configures the RTC clock (RTCCLK).

Note
As the RTC clock configuration bits are in the Backup domain and write access is denied to this domain after reset, you have to enable write access using PWR_BackupAccessCmd(ENABLE) function before to configure the RTC clock source (to be done once after reset).
Once the RTC clock is configured it can't be changed unless the Backup domain is reset using RCC_BackupResetCmd() function, or by a Power On Reset (POR).
Parameters
RCC_RTCCLKSourcespecifies the RTC clock source. This parameter can be one of the following values:
  • RCC_RTCCLKSource_LSE: LSE selected as RTC clock
  • RCC_RTCCLKSource_LSI: LSI selected as RTC clock
  • RCC_RTCCLKSource_HSE_Divx: HSE clock divided by x selected as RTC clock, where x:[2,31]
Note
If the LSE or LSI is used as RTC clock source, the RTC continues to work in STOP and STANDBY modes, and can be used as wakeup source. However, when the HSE clock is used as RTC clock source, the RTC cannot be used in STOP and STANDBY modes.
The maximum input clock frequency for RTC is 1MHz (when using HSE as RTC clock source).
Return values
None
Note
As the RTC clock configuration bits are in the Backup domain and write access is denied to this domain after reset, you have to enable write access using PWR_BackupAccessCmd(ENABLE) function before to configure the RTC clock source (to be done once after reset).
Once the RTC clock is configured it can't be changed unless the RTC is reset using RCC_BackupResetCmd function, or by a Power On Reset (POR)
Parameters
RCC_RTCCLKSourcespecifies the RTC clock source. This parameter can be one of the following values:
  • RCC_RTCCLKSource_LSE: LSE selected as RTC clock
  • RCC_RTCCLKSource_LSI: LSI selected as RTC clock
  • RCC_RTCCLKSource_HSE_Div32: HSE divided by 32 selected as RTC clock
Note
If the LSE or LSI is used as RTC clock source, the RTC continues to work in STOP and STANDBY modes, and can be used as wakeup source. However, when the HSE clock is used as RTC clock source, the RTC cannot be used in STOP and STANDBY modes.
The maximum input clock frequency for RTC is 2MHz (when using HSE as RTC clock source).
Return values
None
Note
Once the RTC clock is selected it can't be changed unless the Backup domain is reset.
Parameters
RCC_RTCCLKSourcespecifies the RTC clock source. This parameter can be one of the following values:
  • RCC_RTCCLKSource_LSE: LSE selected as RTC clock
  • RCC_RTCCLKSource_LSI: LSI selected as RTC clock
  • RCC_RTCCLKSource_HSE_Div128: HSE clock divided by 128 selected as RTC clock
Return values
None

Definition at line 1470 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_SYSCLKConfig ( uint32_t  RCC_SYSCLKSource)

Configures the system clock (SYSCLK).

Note
The HSI is used (enabled by hardware) as system clock source after startup from Reset, wake-up from STOP and STANDBY mode, or in case of failure of the HSE used directly or indirectly as system clock (if the Clock Security System CSS is enabled).
A switch from one clock source to another occurs only if the target clock source is ready (clock stable after startup delay or PLL locked). If a clock source which is not yet ready is selected, the switch will occur when the clock source will be ready. You can use RCC_GetSYSCLKSource() function to know which clock is currently used as system clock source.
Parameters
RCC_SYSCLKSourcespecifies the clock source used as system clock. This parameter can be one of the following values:
  • RCC_SYSCLKSource_HSI: HSI selected as system clock source
  • RCC_SYSCLKSource_HSE: HSE selected as system clock source
  • RCC_SYSCLKSource_PLLCLK: PLL selected as system clock source (RCC_SYSCLKSource_PLLPCLK for STM32F446xx devices)
  • RCC_SYSCLKSource_PLLRCLK: PLL R selected as system clock source only for STM32F446xx devices
Return values
None
Note
The HSI is used (enabled by hardware) as system clock source after startup from Reset, wake-up from STOP and STANDBY mode, or in case of failure of the HSE used directly or indirectly as system clock (if the Clock Security System CSS is enabled).
A switch from one clock source to another occurs only if the target clock source is ready (clock stable after startup delay or PLL locked). If a clock source which is not yet ready is selected, the switch will occur when the clock source will be ready. You can use RCC_GetSYSCLKSource() function to know which clock is currently used as system clock source.
Parameters
RCC_SYSCLKSourcespecifies the clock source used as system clock. This parameter can be one of the following values:
  • RCC_SYSCLKSource_HSI: HSI selected as system clock source
  • RCC_SYSCLKSource_HSE: HSE selected as system clock source
  • RCC_SYSCLKSource_PLLCLK: PLL selected as system clock source
Return values
None
Note
The HSI is used (enabled by hardware) as system clock source after startup from Reset, wake-up from STOP and STANDBY mode, or in case of failure of the HSE used directly or indirectly as system clock (if the Clock Security System CSS is enabled).
A switch from one clock source to another occurs only if the target clock source is ready (clock stable after startup delay or PLL locked). If a clock source which is not yet ready is selected, the switch will occur when the clock source will be ready. You can use RCC_GetSYSCLKSource() function to know which clock is currently used as system clock source.
Parameters
RCC_SYSCLKSourcespecifies the clock source used as system clock source This parameter can be one of the following values:
  • RCC_SYSCLKSource_HSI: HSI selected as system clock source
  • RCC_SYSCLKSource_HSE: HSE selected as system clock source
  • RCC_SYSCLKSource_PLLCLK: PLL selected as system clock source
Return values
None
Parameters
RCC_SYSCLKSourcespecifies the clock source used as system clock. This parameter can be one of the following values:
  • RCC_SYSCLKSource_HSI: HSI selected as system clock
  • RCC_SYSCLKSource_HSE: HSE selected as system clock
  • RCC_SYSCLKSource_PLLCLK: PLL selected as system clock
Return values
None

Definition at line 1149 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_USBCLKConfig ( uint32_t  RCC_USBCLKSource)

Configures the USB clock (USBCLK).

Parameters
RCC_USBCLKSourcespecifies the USB clock source. This clock is derived from the PLL output. This parameter can be one of the following values:
  • RCC_USBCLKSource_PLLCLK_1Div5: PLL clock divided by 1,5 selected as USB clock source
  • RCC_USBCLKSource_PLLCLK_Div1: PLL clock selected as USB clock source
Return values
None

Definition at line 729 of file stm32f10x_rcc.c.

ErrorStatus RCC_WaitForHSEStartUp ( void  )

Waits for HSE start-up.

Note
This functions waits on HSERDY flag to be set and return SUCCESS if this flag is set, otherwise returns ERROR if the timeout is reached and this flag is not set. The timeout value is defined by the constant HSE_STARTUP_TIMEOUT in stm32f4xx.h file. You can tailor it depending on the HSE crystal used in your application.
Parameters
None
Return values
AnErrorStatus enumeration value:
  • SUCCESS: HSE oscillator is stable and ready to use
  • ERROR: HSE oscillator not yet ready
Note
This function waits on HSERDY flag to be set and return SUCCESS if this flag is set, otherwise returns ERROR if the timeout is reached and this flag is not set. The timeout value is defined by the constant HSE_STARTUP_TIMEOUT in stm32f30x.h file. You can tailor it depending on the HSE crystal used in your application.
Parameters
None
Return values
AnErrorStatus enumeration value:
  • SUCCESS: HSE oscillator is stable and ready to use
  • ERROR: HSE oscillator not yet ready
Parameters
None
Return values
AnErrorStatus enumuration value:
  • SUCCESS: HSE oscillator is stable and ready to use
  • ERROR: HSE oscillator not yet ready

Definition at line 308 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.



rosflight_firmware
Author(s): Daniel Koch , James Jackson
autogenerated on Thu Oct 24 2019 03:17:23