STM32F1xx_System_Private_Functions
[Stm32f1xx_system]

Update SystemCoreClock variable according to Clock Register Values.

Update SystemCoreClock variable.

Updates the SystemCoreClock variable.

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 by the PLL factors.

(*) HSI_VALUE is a constant defined in stm32f1xx.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 stm32f1xx.h file (default value 8 MHz or 25 MHz, depending on the product used), 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 265 of file system_stm32f1xx.c.

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

Initialize the system.

Setup the microcontroller system.

Note:

This function should be used only after reset.

Parameters:

None

Return values:

None

Definition at line 175 of file system_stm32f1xx.c.

Setup the external memory controller.

Called in startup_stm32f1xx.s before jump to __main

Parameters:

None

Return values:

None	Setup the external memory controller. Called in startup_stm32f1xx_xx.s/.c before jump to main. This function configures the external SRAM mounted on STM3210E-EVAL board (STM32 High density devices). This SRAM will be used as program data memory (including heap and stack).

Parameters:

None

Return values:

None

< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is required, then adjust the Register Addresses

Definition at line 390 of file system_stm32f1xx.c.