Functions
Internal and external clocks, PLL, CSS and MCO configuration functions
STM32F4xx_StdPeriph_Driver | STM32F10x_StdPeriph_Driver | STM32F30x_StdPeriph_Driver » RCC » RCC_Private_Functions

Internal and external clocks, PLL, CSS and MCO configuration functions. More...

Collaboration diagram for Internal and external clocks, PLL, CSS and MCO configuration functions:

Functions

void RCC_AdjustHSICalibrationValue (uint8_t HSICalibrationValue)
 Adjusts the Internal High Speed oscillator (HSI) calibration value. 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_HSEConfig (uint8_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_LSEConfig (uint32_t RCC_LSE)
 Configures the External Low Speed oscillator (LSE). More...
 
void RCC_LSEConfig (uint8_t RCC_LSE)
 Configures the External Low Speed oscillator (LSE). More...
 
void RCC_LSEDriveConfig (uint32_t RCC_LSEDrive)
 Configures the External Low Speed oscillator (LSE) drive capability. More...
 
void RCC_LSICmd (FunctionalState NewState)
 Enables or disables the Internal Low Speed oscillator (LSI). More...
 
void RCC_MCO1Config (uint32_t RCC_MCO1Source, uint32_t RCC_MCO1Div)
 Selects the clock source to output on MCO1 pin(PA8). More...
 
void RCC_MCO2Config (uint32_t RCC_MCO2Source, uint32_t RCC_MCO2Div)
 Selects the clock source to output on MCO2 pin(PC9). More...
 
void RCC_MCOConfig (uint8_t RCC_MCOSource, uint32_t RCC_MCOPrescaler)
 Selects the clock source to output on MCO pin (PA8) and the corresponding prescsaler. 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_PLLConfig (uint32_t RCC_PLLSource, uint32_t PLLM, uint32_t PLLN, uint32_t PLLP, uint32_t PLLQ)
 Configures the main PLL clock source, multiplication and division factors. More...
 
void RCC_PLLI2SCmd (FunctionalState NewState)
 Enables or disables the PLLI2S. More...
 
void RCC_PLLI2SConfig (uint32_t PLLI2SN, uint32_t PLLI2SR)
 Configures the PLLI2S clock multiplication and division factors. More...
 
void RCC_PLLSAICmd (FunctionalState NewState)
 Enables or disables the PLLSAI. More...
 
void RCC_PREDIV1Config (uint32_t RCC_PREDIV1_Div)
 Configures the PREDIV1 division factor. More...
 
ErrorStatus RCC_WaitForHSEStartUp (void)
 Waits for HSE start-up. More...
 

Detailed Description

Internal and external clocks, PLL, CSS and MCO configuration functions. 

 ===================================================================================
 ##### Internal and  external clocks, PLL, CSS and MCO configuration functions #####
 ===================================================================================
    [..]
      This section provide functions allowing to configure the internal/external clocks,
      PLLs, CSS and MCO pins.
  
      (#) HSI (high-speed internal), 16 MHz factory-trimmed RC used directly or through
          the PLL as System clock source.

      (#) LSI (low-speed internal), 32 KHz low consumption RC used as IWDG and/or RTC
          clock source.

      (#) HSE (high-speed external), 4 to 26 MHz crystal oscillator used directly or
          through the PLL as System clock source. Can be used also as RTC clock source.

      (#) LSE (low-speed external), 32 KHz oscillator used as RTC clock source.   

      (#) PLL (clocked by HSI or HSE), featuring two different output clocks:
        (++) The first output is used to generate the high speed system clock (up to 168 MHz)
        (++) The second output is used to generate the clock for the USB OTG FS (48 MHz),
             the random analog generator (<=48 MHz) and the SDIO (<= 48 MHz).

      (#) PLLI2S (clocked by HSI or HSE), used to generate an accurate clock to achieve 
          high-quality audio performance on the I2S interface or SAI interface in case 
          of STM32F429x/439x devices.
     
      (#) PLLSAI clocked by (HSI or HSE), used to generate an accurate clock to SAI 
          interface and LCD TFT controller available only for STM32F42xxx/43xxx/446xx/469xx/479xx devices.
  
      (#) CSS (Clock security system), once enable and if a HSE clock failure occurs 
         (HSE used directly or through PLL as System clock source), the System clock
         is automatically switched to HSI and an interrupt is generated if enabled. 
         The interrupt is linked to the Cortex-M4 NMI (Non-Maskable Interrupt) 
         exception vector.   

      (#) MCO1 (microcontroller clock output), used to output HSI, LSE, HSE or PLL
          clock (through a configurable prescaler) on PA8 pin.

      (#) MCO2 (microcontroller clock output), used to output HSE, PLL, SYSCLK or PLLI2S
          clock (through a configurable prescaler) on PC9 pin.
 ===================================================================================
 ##### Internal and  external clocks, PLL, CSS and MCO configuration functions #####
 ===================================================================================  
    [..]
      This section provide functions allowing to configure the internal/external clocks,
      PLLs, CSS and MCO pins.
  
      (#) HSI (high-speed internal), 16 MHz factory-trimmed RC used directly or through
          the PLL as System clock source.

      (#) LSI (low-speed internal), 32 KHz low consumption RC used as IWDG and/or RTC
          clock source.

      (#) HSE (high-speed external), 4 to 26 MHz crystal oscillator used directly or
          through the PLL as System clock source. Can be used also as RTC clock source.

      (#) LSE (low-speed external), 32 KHz oscillator used as RTC clock source.   

      (#) PLL (clocked by HSI or HSE), featuring two different output clocks:
        (++) The first output is used to generate the high speed system clock (up to 168 MHz)
        (++) The second output is used to generate the clock for the USB OTG FS (48 MHz),
             the random analog generator (<=48 MHz) and the SDIO (<= 48 MHz).

      (#) PLLI2S (clocked by HSI or HSE), used to generate an accurate clock to achieve 
          high-quality audio performance on the I2S interface.
  
      (#) CSS (Clock security system), once enable and if a HSE clock failure occurs 
         (HSE used directly or through PLL as System clock source), the System clock
         is automatically switched to HSI and an interrupt is generated if enabled. 
         The interrupt is linked to the Cortex-M4 NMI (Non-Maskable Interrupt) 
         exception vector.   

      (#) MCO1 (microcontroller clock output), used to output HSI, LSE, HSE or PLL
          clock (through a configurable prescaler) on PA8 pin.

      (#) MCO2 (microcontroller clock output), used to output HSE, PLL, SYSCLK or PLLI2S
          clock (through a configurable prescaler) on PC9 pin.
 ===============================================================================
 ##### Internal-external clocks, PLL, CSS and MCO configuration functions #####
 ===============================================================================  
    [..] This section provides functions allowing to configure the internal/external 
         clocks, PLL, CSS and MCO.
         (#) HSI (high-speed internal), 8 MHz factory-trimmed RC used directly 
             or through the PLL as System clock source.
             The HSI clock can be used also to clock the USART and I2C peripherals.
         (#) LSI (low-speed internal), 40 KHz low consumption RC used as IWDG and/or RTC
             clock source.
         (#) HSE (high-speed external), 4 to 32 MHz crystal oscillator used directly or
             through the PLL as System clock source. Can be used also as RTC clock source.
         (#) LSE (low-speed external), 32 KHz oscillator used as RTC clock source.
             LSE can be used also to clock the USART peripherals.
         (#) PLL (clocked by HSI or HSE), for System clock.
         (#) CSS (Clock security system), once enabled and if a HSE clock failure occurs 
             (HSE used directly or through PLL as System clock source), the System clock
             is automatically switched to HSI and an interrupt is generated if enabled. 
             The interrupt is linked to the Cortex-M4 NMI (Non-Maskable Interrupt) 
             exception vector.   
         (#) MCO (microcontroller clock output), used to output SYSCLK, HSI, HSE, LSI, LSE,
             PLL clock on PA8 pin.

Function Documentation

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

Definition at line 339 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

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

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

void RCC_HSEConfig ( uint8_t  RCC_HSE)

Configures the External High Speed oscillator (HSE).

Note
After enabling the HSE (RCC_HSE_ON or RCC_HSE_Bypass), the application software should wait on HSERDY flag to be set indicating that HSE clock is stable and can be used to clock the PLL and/or system clock.
HSE state can not be changed 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 change the HSE state (ex. disable it).
The HSE is stopped by hardware when entering STOP and STANDBY modes.
This function reset the CSSON bit, so if the Clock security system(CSS) was previously enabled you have to enable it again after calling this function.
Parameters
RCC_HSEspecifies the new state of the HSE. This parameter can be one of the following values:
  • RCC_HSE_OFF: turn OFF the HSE oscillator, HSERDY flag goes low after 6 HSE oscillator clock cycles.
  • RCC_HSE_ON: turn ON the HSE oscillator
  • RCC_HSE_Bypass: HSE oscillator bypassed with external clock
Return values
None
Note
After enabling the HSE (RCC_HSE_ON or RCC_HSE_Bypass), the application software should wait on HSERDY flag to be set indicating that HSE clock is stable and can be used to clock the PLL and/or system clock.
HSE state can not be changed 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 change the HSE state (ex. disable it).
The HSE is stopped by hardware when entering STOP and STANDBY modes.
This function resets the CSSON bit, so if the Clock security system(CSS) was previously enabled you have to enable it again after calling this function.
Parameters
RCC_HSEspecifies the new state of the HSE. This parameter can be one of the following values:
  • RCC_HSE_OFF: turn OFF the HSE oscillator, HSERDY flag goes low after 6 HSE oscillator clock cycles.
  • RCC_HSE_ON: turn ON the HSE oscillator
  • RCC_HSE_Bypass: HSE oscillator bypassed with external clock
Return values
None

Definition at line 284 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_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

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

void RCC_LSEConfig ( uint32_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

Definition at line 354 of file stm32f30x_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

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

void RCC_LSEDriveConfig ( uint32_t  RCC_LSEDrive)

Configures the External Low Speed oscillator (LSE) drive capability.

Parameters
RCC_LSEDrivespecifies 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

Definition at line 380 of file stm32f30x_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

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

void RCC_MCO1Config ( uint32_t  RCC_MCO1Source,
uint32_t  RCC_MCO1Div 
)

Selects the clock source to output on MCO1 pin(PA8).

Note
PA8 should be configured in alternate function mode.
Parameters
RCC_MCO1Sourcespecifies the clock source to output. This parameter can be one of the following values:
  • RCC_MCO1Source_HSI: HSI clock selected as MCO1 source
  • RCC_MCO1Source_LSE: LSE clock selected as MCO1 source
  • RCC_MCO1Source_HSE: HSE clock selected as MCO1 source
  • RCC_MCO1Source_PLLCLK: main PLL clock selected as MCO1 source
RCC_MCO1Divspecifies the MCO1 prescaler. This parameter can be one of the following values:
  • RCC_MCO1Div_1: no division applied to MCO1 clock
  • RCC_MCO1Div_2: division by 2 applied to MCO1 clock
  • RCC_MCO1Div_3: division by 3 applied to MCO1 clock
  • RCC_MCO1Div_4: division by 4 applied to MCO1 clock
  • RCC_MCO1Div_5: division by 5 applied to MCO1 clock
Return values
None

Definition at line 904 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_MCO2Config ( uint32_t  RCC_MCO2Source,
uint32_t  RCC_MCO2Div 
)

Selects the clock source to output on MCO2 pin(PC9).

Note
PC9 should be configured in alternate function mode.
Parameters
RCC_MCO2Sourcespecifies the clock source to output. This parameter can be one of the following values:
  • RCC_MCO2Source_SYSCLK: System clock (SYSCLK) selected as MCO2 source
  • RCC_MCO2SOURCE_PLLI2SCLK: PLLI2S clock selected as MCO2 source, available for all STM32F4 devices except STM32F410xx
  • RCC_MCO2SOURCE_I2SCLK: I2SCLK clock selected as MCO2 source, available only for STM32F410xx devices
  • RCC_MCO2Source_HSE: HSE clock selected as MCO2 source
  • RCC_MCO2Source_PLLCLK: main PLL clock selected as MCO2 source
RCC_MCO2Divspecifies the MCO2 prescaler. This parameter can be one of the following values:
  • RCC_MCO2Div_1: no division applied to MCO2 clock
  • RCC_MCO2Div_2: division by 2 applied to MCO2 clock
  • RCC_MCO2Div_3: division by 3 applied to MCO2 clock
  • RCC_MCO2Div_4: division by 4 applied to MCO2 clock
  • RCC_MCO2Div_5: division by 5 applied to MCO2 clock
Note
For STM32F410xx devices to output I2SCLK clock on MCO2 you should have at last one of the SPI clocks enabled (SPI1, SPI2 or SPI5).
Return values
None
Note
PC9 should be configured in alternate function mode.
Parameters
RCC_MCO2Sourcespecifies the clock source to output. This parameter can be one of the following values:
  • RCC_MCO2Source_SYSCLK: System clock (SYSCLK) selected as MCO2 source
  • RCC_MCO2Source_PLLI2SCLK: PLLI2S clock selected as MCO2 source
  • RCC_MCO2Source_HSE: HSE clock selected as MCO2 source
  • RCC_MCO2Source_PLLCLK: main PLL clock selected as MCO2 source
RCC_MCO2Divspecifies the MCO2 prescaler. This parameter can be one of the following values:
  • RCC_MCO2Div_1: no division applied to MCO2 clock
  • RCC_MCO2Div_2: division by 2 applied to MCO2 clock
  • RCC_MCO2Div_3: division by 3 applied to MCO2 clock
  • RCC_MCO2Div_4: division by 4 applied to MCO2 clock
  • RCC_MCO2Div_5: division by 5 applied to MCO2 clock
Return values
None

Definition at line 949 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_MCOConfig ( uint8_t  RCC_MCOSource,
uint32_t  RCC_MCOPrescaler 
)

Selects the clock source to output on MCO pin (PA8) and the corresponding prescsaler.

Note
PA8 should be configured in alternate function mode.
Parameters
RCC_MCOSourcespecifies the clock source to output. This parameter can be one of the following values:
  • RCC_MCOSource_NoClock: No clock selected.
  • RCC_MCOSource_HSI14: HSI14 oscillator clock selected.
  • RCC_MCOSource_LSI: LSI oscillator clock selected.
  • RCC_MCOSource_LSE: LSE oscillator clock selected.
  • RCC_MCOSource_SYSCLK: System clock selected.
  • RCC_MCOSource_HSI: HSI oscillator clock selected.
  • RCC_MCOSource_HSE: HSE oscillator clock selected.
  • RCC_MCOSource_PLLCLK_Div2: PLL clock divided by 2 selected.
  • RCC_MCOSource_PLLCLK: PLL clock selected.
  • RCC_MCOSource_HSI48: HSI48 clock selected.
RCC_MCOPrescalerspecifies the prescaler on MCO pin. This parameter can be one of the following values:
  • RCC_MCOPrescaler_1: MCO clock is divided by 1.
  • RCC_MCOPrescaler_2: MCO clock is divided by 2.
  • RCC_MCOPrescaler_4: MCO clock is divided by 4.
  • RCC_MCOPrescaler_8: MCO clock is divided by 8.
  • RCC_MCOPrescaler_16: MCO clock is divided by 16.
  • RCC_MCOPrescaler_32: MCO clock is divided by 32.
  • RCC_MCOPrescaler_64: MCO clock is divided by 64.
  • RCC_MCOPrescaler_128: MCO clock is divided by 128.
Return values
None

Definition at line 567 of file stm32f30x_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
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.
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 427 of file stm32f30x_rcc.c.

void RCC_PLLConfig ( uint32_t  RCC_PLLSource,
uint32_t  PLLM,
uint32_t  PLLN,
uint32_t  PLLP,
uint32_t  PLLQ 
)

Configures the main PLL clock source, multiplication and division factors.

Note
This function must be used only when the main PLL is disabled.
Parameters
RCC_PLLSourcespecifies the PLL entry clock source. This parameter can be one of the following values:
  • RCC_PLLSource_HSI: HSI oscillator clock selected as PLL clock entry
  • RCC_PLLSource_HSE: HSE oscillator clock selected as PLL clock entry
Note
This clock source (RCC_PLLSource) is common for the main PLL and PLLI2S.
Parameters
PLLMspecifies the division factor for PLL VCO input clock This parameter must be a number between 0 and 63.
Note
You have to set the PLLM parameter correctly to ensure that the VCO input frequency ranges from 1 to 2 MHz. It is recommended to select a frequency of 2 MHz to limit PLL jitter.
Parameters
PLLNspecifies the multiplication factor for PLL VCO output clock This parameter must be a number between 192 and 432.
Note
You have to set the PLLN parameter correctly to ensure that the VCO output frequency is between 192 and 432 MHz.
Parameters
PLLPspecifies the division factor for main system clock (SYSCLK) This parameter must be a number in the range {2, 4, 6, or 8}.
Note
You have to set the PLLP parameter correctly to not exceed 168 MHz on the System clock frequency.
Parameters
PLLQspecifies the division factor for OTG FS, SDIO and RNG clocks This parameter must be a number between 4 and 15.
Note
If the USB OTG FS is used in your application, you have to set the PLLQ parameter correctly to have 48 MHz clock for the USB. However, the SDIO and RNG need a frequency lower than or equal to 48 MHz to work correctly.
Return values
None

Definition at line 454 of file STM32F4xx_StdPeriph_Driver/src/stm32f4xx_rcc.c.

void RCC_PLLI2SCmd ( FunctionalState  NewState)

Enables or disables the PLLI2S.

Note
The PLLI2S is disabled by hardware when entering STOP and STANDBY modes.
Parameters
NewStatenew state of the PLLI2S. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 732 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_PLLI2SConfig ( uint32_t  PLLI2SN,
uint32_t  PLLI2SR 
)

Configures the PLLI2S clock multiplication and division factors.

Note
This function must be used only when the PLLI2S is disabled.
PLLI2S clock source is common with the main PLL (configured in RCC_PLLConfig function )
Parameters
PLLI2SNspecifies the multiplication factor for PLLI2S VCO output clock This parameter must be a number between 192 and 432.
Note
You have to set the PLLI2SN parameter correctly to ensure that the VCO output frequency is between 192 and 432 MHz.
Parameters
PLLI2SRspecifies the division factor for I2S clock This parameter must be a number between 2 and 7.
Note
You have to set the PLLI2SR parameter correctly to not exceed 192 MHz on the I2S clock frequency.
Return values
None

Definition at line 503 of file STM32F4xx_StdPeriph_Driver/src/stm32f4xx_rcc.c.

void RCC_PLLSAICmd ( FunctionalState  NewState)

Enables or disables the PLLSAI.

Note
This function can be used only for STM32F42xxx/43xxx/446xx/469xx/479xx devices
The PLLSAI is disabled by hardware when entering STOP and STANDBY modes.
Parameters
NewStatenew state of the PLLSAI. This parameter can be: ENABLE or DISABLE.
Return values
None

Definition at line 861 of file CMSIS/CM4/DeviceSupport/ST/STM32F4xx/stm32f4xx_rcc.c.

void RCC_PREDIV1Config ( uint32_t  RCC_PREDIV1_Div)

Configures the PREDIV1 division factor.

Note
This function must be used only when the PLL is disabled.
Parameters
RCC_PREDIV1_Divspecifies the PREDIV1 clock division factor. This parameter can be RCC_PREDIV1_Divx where x:[1,16]
Return values
None

Definition at line 466 of file stm32f30x_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

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 Apr 15 2021 05:07:54