stm32_clk.h File Reference

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Defines
#define	SYSCLK_HSI   0
#define	SYSCLK_PLL   1
#define	SYSCLK_HSE   2
#define	PLLCLK_HSI   3
#define	PLLCLK_HSE   4
Functions
int	CtlHseClock (uint8_t ena)
	Control HSE clock.
int	CtlHsiClock (uint8_t ena)
	Control HSI clock.
int	CtlPllClock (uint8_t ena)
	Control PLL clock.
int	SetPllClock (int src)
int	SetPllClockSource (int src)
	Configures the System clock source: HSE or HSI.
int	SetSysClock (void)
	Update SystemCoreClock according to Clock Register Values.
uint32_t	SysCtlClockGet (void)
	requests System clock frequency
Variables
uint32_t	SystemCoreClock

---

Define Documentation

#define SYSCLK_HSI   0

Referenced by SetSysClockSource().

#define SYSCLK_PLL   1

Referenced by SetSysClockSource().

#define SYSCLK_HSE   2

Referenced by SetSysClockSource().

#define PLLCLK_HSI   3

Referenced by SetPllClockSource().

#define PLLCLK_HSE   4

Referenced by SetPllClockSource().

---

Function Documentation

int CtlHseClock

(

uint8_t

ena

)

Control HSE clock.

Parameters:

ena	0 disable clock, any other value enable it.

Returns:

0 on success, -1 on HSE start failed.

References HSE_STARTUP_TIMEOUT, rc, RCC, RCC_CR_HSEON, RCC_CR_HSERDY, RCC_CR_HSION, and RESET.

Referenced by SetPllClockSource(), and SetSysClockSource().

int CtlHsiClock

(

uint8_t

ena

)

Control HSI clock.

Parameters:

ena	0 disable clock, any other value enable it.

Returns:

0 on success, -1 on HSI start failed.

References HSE_STARTUP_TIMEOUT, rc, RCC, RCC_CR_HSION, RCC_CR_HSIRDY, and RESET.

Referenced by SetPllClockSource(), and SetSysClockSource().

int CtlPllClock

(

uint8_t

ena

)

Control PLL clock.

Parameters:

ena	0 disable clock, any other value enable it.

Returns:

0 on success, -1 on PLL start failed.

References HSE_STARTUP_TIMEOUT, rc, RCC, RCC_CR_PLLON, RCC_CR_PLLRDY, and RESET.

Referenced by SetSysClockSource().

int SetPllClock

(

int

src

)

int SetPllClockSource

(

int

src

)

Configures the System clock source: HSE or HSI.

Note:

This function should be used only after reset.

Parameters:

src	is one of PLLCLK_HSE, PLLCLK_HSI.

Returns:

0 if clock is running ale -1.

Note:

This function should be used with PLL disables

Parameters:

src	is one of PLLCLK_HSE, PLLCLK_HSI.

Returns:

0 if clock is running ale -1.

References _BI32, CM3BBREG, CtlHseClock(), CtlHsiClock(), ENABLE, PLLCLK_HSE, PLLCLK_HSI, rc, RCC, RCC_BASE, RCC_CFGR_PLLSRC, RCC_CFGR_PLLXTPRE, and RCC_PLLCFGR_PLLSRC.

Here is the call graph for this function:

int SetSysClock

(

void

)

Update SystemCoreClock according to Clock Register Values.

This function reads out the CPUs clock and PLL registers and assembles the actual clock speed values into the SystemCoreClock global variable. Sets System clock frequency to the configured defaults.

Note:

This function should be used only after reset.

Parameters:

None

Return values:

None	Update SystemCoreClock according to Clock Register Values.

Note:

This function should be used only after reset.

Parameters:

None

Return values:

None	Update SystemCoreClock according to Clock Register Values.

Enable HSI/HSE clock and setup HCLK, PCLK2 and PCLK1 prescalers.

Parameters:

None.

Returns:

0 on success, -1 on fault of HSE.

References CCLKCFG_Val, CCLKSEL_Val, CLKOUTCFG_Val, CLKSRCSEL_Val, EMCCLKSEL_Val, FLASH, FLASH_ACR_LATENCY, FLASH_ACR_LATENCY_1, FLASH_ACR_PRFTBE, FLASHCFG_Val, HSE_VALUE, LPC_SC, PCLKSEL0_Val, PCLKSEL1_Val, PCLKSEL_Val, PCONP_Val, PLL0CFG_Val, PLL1CFG_Val, rc, RCC, RCC_CFGR_HPRE, RCC_CFGR_HPRE_DIV1, RCC_CFGR_PPRE1, RCC_CFGR_PPRE1_DIV1, RCC_CFGR_PPRE2, RCC_CFGR_PPRE2_DIV1, SCS_Val, SetSysClockSource(), SYSCLK_SOURCE, SystemCoreClockUpdate(), USBCLKCFG_Val, and USBCLKSEL_Val.

Here is the call graph for this function:

uint32_t SysCtlClockGet

(

void

)

requests System clock frequency

Note:

This function should be used only after reset.

Parameters:

None

Return values:

None

References SystemCoreClock, and SystemCoreClockUpdate().

Here is the call graph for this function: