Martin Johnson / STM32F3-Discovery

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STM32F30x_System_Private_Functions
Functions

STM32F30x_System_Private_Functions
[Stm32f30x_system]

Functions

void SystemInit (void)
 Setup the microcontroller system Initialize the Embedded Flash Interface, the PLL and update the SystemFrequency variable.
void SystemCoreClockUpdate (void)
 Update SystemCoreClock variable according to Clock Register Values.
static void SetSysClock (void)
 Configures the System clock source, PLL Multiplier and Divider factors, AHB/APBx prescalers and Flash settings.

Function Documentation

static void SetSysClock ( void   ) [static]

Configures the System clock source, PLL Multiplier and Divider factors, AHB/APBx prescalers and Flash settings.

Note:
This function should be called only once the RCC clock configuration is reset to the default reset state (done in SystemInit() function).
Parameters:
None
Return values:
None

Definition at line 331 of file system_stm32f30x.c.

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.

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 stm32f30x.h file (default value 8 MHz) but the real value may vary depending on the variations in voltage and temperature.

(**) 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 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 279 of file system_stm32f30x.c.

void SystemInit ( void   )

Setup the microcontroller system Initialize the Embedded Flash Interface, the PLL and update the SystemFrequency variable.

Parameters:
None
Return values:
None

Definition at line 157 of file system_stm32f30x.c.

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