Functions
STM32F4xx_System_Exported_Functions
Collaboration diagram for STM32F4xx_System_Exported_Functions:

Functions

void SystemCoreClockUpdate (void)
 Update SystemCoreClock variable according to Clock Register Values. The SystemCoreClock variable contains the core clock (HCLK), it can be used by the user application to setup the SysTick timer or configure other parameters. More...
 
void SystemInit (void)
 Setup the microcontroller system Initialize the FPU setting, vector table location and External memory configuration. More...
 

Detailed Description

Function Documentation

◆ SystemCoreClockUpdate()

void SystemCoreClockUpdate ( void  )

Update SystemCoreClock variable according to Clock Register Values. The SystemCoreClock variable contains the core clock (HCLK), it can be used by the user application to setup the SysTick timer or configure other parameters.

Updates the SystemCoreClock variable.

Update SystemCoreClock variable according to Clock Register Values. The SystemCoreClock variable contains the core clock , it can be used by the user application to setup the SysTick timer or configure other parameters.

Note
Each time the core clock (HCLK) changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
- 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, SystemCoreClock will contain the HSI_VALUE(*)
  • If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
  • If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) or HSI_VALUE(*) multiplied/divided by the PLL factors.

(*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.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_hal_conf.h file (its value depends on the application requirements), 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
None
Return values
None
Note
Each time the core clock changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
- 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:

(*) CSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value 4 MHz) but the real value may vary depending on the variations in voltage and temperature.
(**) HSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value 64 MHz) but the real value may vary depending on the variations in voltage and temperature.

(***)HSE_VALUE is a constant defined in stm32h7xx_hal.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
    None
    Return values
    NoneUpdates the SystemCoreClock variable.
    Note
    Each time the core clock (HCLK) changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
    - 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, SystemCoreClock will contain the HSI_VALUE(*)
    • If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
    • If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) or HSI_VALUE(*) multiplied/divided by the PLL factors.
    (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.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_hal_conf.h file (its value depends on the application requirements), 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
None
Return values
NoneUpdates the SystemCoreClock variable.
Note
Each time the core clock (HCLK) changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
- 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, SystemCoreClock will contain the HSI_VALUE(*)
  • If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
  • If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) or HSI_VALUE(*) multiplied/divided by the PLL factors.

(*) HSI_VALUE is a constant defined in stm32f7xx.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 stm32f7xx.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
None
Return values
NoneUpdate SystemCoreClock variable according to Clock Register Values. The SystemCoreClock variable contains the core clock (HCLK), it can be used by the user application to setup the SysTick timer or configure other parameters.

Updates the SystemCoreClock variable.

Note
Each time the core clock changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
- 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:

(*) CSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value 4 MHz) but the real value may vary depending on the variations in voltage and temperature. (**) HSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value 64 MHz) but the real value may vary depending on the variations in voltage and temperature.

(***)HSE_VALUE is a constant defined in stm32h7xx_hal.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
    None
    Return values
    None
    Note
    Each time the core clock changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.
    - 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:
    (*) CSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value 4 MHz) but the real value may vary depending on the variations in voltage and temperature.
    (**) HSI_VALUE is a constant defined in stm32h7xx_hal.h file (default value 64 MHz) but the real value may vary depending on the variations in voltage and temperature.

(***)HSE_VALUE is a constant defined in stm32h7xx_hal.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
    None
    Return values
    None

Definition at line 138 of file system_MIMXRT1052.c.

◆ SystemInit()

void SystemInit ( void  )

Setup the microcontroller system Initialize the FPU setting, vector table location and External memory configuration.

Setup the microcontroller system.

Parameters
None
Return values
NoneSetup the microcontroller system Initialize the FPU setting, vector table location and External memory configuration.

Setup the microcontroller system.

Parameters
None
Return values
NoneSetup the microcontroller system.

Setup the microcontroller system Initialize the FPU setting, vector table location and External memory configuration.

Parameters
None
Return values
None

Definition at line 75 of file system_MIMXRT1052.c.



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autogenerated on Fri Apr 1 2022 02:15:19