stm32_clk.c File Reference

#include <cfg/arch.h>
#include <arch/cm3.h>
#include <arch/cm3/stm/stm32_clk.h>
#include <cfg/clock.h>

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Defines
#define	SYSCLK_SOURCE   SYSCLK_HSI
Functions
void	SystemCoreClockUpdate (void)
	Update SystemCoreClock according to Clock Register Values.
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	SetPllClockSource (int src)
	Configures the System clock source: HSE or HSI.
int	SetSysClockSource (int src)
	Configures the System clock source: HSI, HS or PLL.
int	SetSysClock (void)
	Configures the System clock coming from HSE or HSI oscillator.
uint32_t	SysCtlClockGet (void)
	requests System clock frequency
Variables
uint32_t	SystemCoreClock

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Define Documentation

#define SYSCLK_SOURCE   SYSCLK_HSI

Referenced by SetSysClock().

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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.

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.

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.

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.

References CtlHseClock(), CtlHsiClock(), ENABLE, PLLCLK_HSE, PLLCLK_HSI, rc, RCC, RCC_CFGR_PLLSRC, and RCC_CFGR_PLLXTPRE.

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int SetSysClockSource

(

int

src

)

Configures the System clock source: HSI, HS or PLL.

Note:

This function should be used only after reset.

Parameters:

src	is one of SYSCLK_HSE, SYSCLK_HSI or SYSCLK_PLL.

Returns:

0 if selected clock is running else -1.

References CtlHseClock(), CtlHsiClock(), CtlPllClock(), ENABLE, rc, RCC, RCC_CFGR_SW, RCC_CFGR_SW_HSE, RCC_CFGR_SW_HSI, RCC_CFGR_SW_PLL, RCC_CFGR_SWS, RCC_CFGR_SWS_HSE, RCC_CFGR_SWS_HSI, RCC_CFGR_SWS_PLL, SYSCLK_HSE, SYSCLK_HSI, SYSCLK_PLL, and SystemCoreClockUpdate().

Referenced by SetSysClock().

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int SetSysClock

(

void

)

Configures the System clock coming from HSE or HSI oscillator.

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 FLASH, FLASH_ACR_LATENCY, FLASH_ACR_LATENCY_1, FLASH_ACR_PRFTBE, HSE_VALUE, rc, RCC, RCC_CFGR_HPRE, RCC_CFGR_HPRE_DIV1, RCC_CFGR_PPRE1, RCC_CFGR_PPRE1_DIV1, RCC_CFGR_PPRE2, RCC_CFGR_PPRE2_DIV1, SetSysClockSource(), and SYSCLK_SOURCE.

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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().

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