Detailed Description

Real Time Counter (RTC) Peripheral API.

This module contains functions to control the RTC peripheral of Silicon Labs 32-bit MCUs and SoCs. The RTC ensures timekeeping in low energy modes.

Data Structures
struct	RTC_Init_TypeDef

Macros
#define	NUM_RTC_CHANNELS 2U

#define	RTC_INIT_DEFAULT

Functions
uint32_t	RTC_CompareGet (unsigned int comp)
	Get the RTC compare register value.

void	RTC_CompareSet (unsigned int comp, uint32_t value)
	Set the RTC compare register value.

__STATIC_INLINE uint32_t	RTC_CounterGet (void)
	Get RTC counter value.

void	RTC_CounterReset (void)
	Restart the RTC counter from zero.

__STATIC_INLINE void	RTC_CounterSet (uint32_t value)
	Set the RTC counter value.

void	RTC_Enable (bool enable)
	Enable/disable RTC.

void	RTC_FreezeEnable (bool enable)
	RTC register synchronization freeze control.

void	RTC_Init (const RTC_Init_TypeDef *init)
	Initialize RTC.

__STATIC_INLINE void	RTC_IntClear (uint32_t flags)
	Clear one or more pending RTC interrupts.

__STATIC_INLINE void	RTC_IntDisable (uint32_t flags)
	Disable one or more RTC interrupts.

__STATIC_INLINE void	RTC_IntEnable (uint32_t flags)
	Enable one or more RTC interrupts.

__STATIC_INLINE uint32_t	RTC_IntGet (void)
	Get pending RTC interrupt flags.

__STATIC_INLINE uint32_t	RTC_IntGetEnabled (void)
	Get enabled and pending RTC interrupt flags. Useful for handling more interrupt sources in the same interrupt handler.

__STATIC_INLINE void	RTC_IntSet (uint32_t flags)
	Set one or more pending RTC interrupts from SW.

void	RTC_Reset (void)
	Restore RTC to reset state.

Macro Definition Documentation

#define NUM_RTC_CHANNELS 2U

The RTC peripheral on series 0 devices support 2 compare channels while the RTC peripheral on series 1 devices support 6 compare channels.

Definition at line 61 of file em_rtc.h .

Referenced by RTC_Reset() .

#define RTC_INIT_DEFAULT

Value:

         { \
        
         true,
         
          /* Start counting when initialization is done. */
         
         \
        
         false,
         
          /* Disable updating during debug halt. */
         
         \
        
         true
         
          /* Restart counting from 0 when reaching COMP0. */
         
         \
        
         }

Suggested default configuration for RTC initialization structure.

Definition at line 78 of file em_rtc.h .

Referenced by UDELAY_Calibrate() .

Function Documentation

uint32_t RTC_CompareGet ( unsigned int comp )

Get the RTC compare register value.

Parameters

[in] comp A compare register to get. This value must be less than NUM_RTC_CHANNELS .

Returns: A compare register value, 0 if invalid register selected.

Definition at line 117 of file em_rtc.c .

References RTC .

void RTC_CompareSet	(	unsigned int	`comp,`
		uint32_t	`value`
	)

Set the RTC compare register value.

Note: The setting of a compare register requires synchronization into the low-frequency domain. If the same register is modified before a previous update has completed, this function will stall until the previous synchronization has completed. This only applies to the Gecko Family. See comments in the regSync() internal function call.

Parameters

[in]	`comp`	A compare register to set. This value must be less than NUM_RTC_CHANNELS .
[in]	`value`	An initialization value (<= 0x00ffffff).

Definition at line 163 of file em_rtc.c .

References _RTC_COMP0_COMP0_MASK , _RTC_COMP0_COMP0_SHIFT , RTC , RTC_SYNCBUSY_COMP0 , and RTC_SYNCBUSY_COMP1 .

__STATIC_INLINE uint32_t RTC_CounterGet ( void )

Get RTC counter value.

Returns: Current RTC counter value.

Definition at line 99 of file em_rtc.h .

References RTC .

__STATIC_INLINE void RTC_CounterSet ( uint32_t value )

Set the RTC counter value.

Parameters

[in] value The new RTC counter value.

Definition at line 112 of file em_rtc.h .

References RTC .

void RTC_Enable ( bool enable )

Enable/disable RTC.

Note: The enabling/disabling of RTC modifies the RTC CTRL register which requires synchronization into the low-frequency domain. If this register is modified before a previous update to the same register has completed, this function will stall until the previous synchronization has completed. This only applies to the Gecko Family. See comments in the regSync() internal function call.

Parameters

[in] enable True to enable counting, false to disable.

Definition at line 226 of file em_rtc.c .

References _RTC_CTRL_EN_SHIFT , BUS_RegBitWrite() , RTC , and RTC_SYNCBUSY_CTRL .

Referenced by RTC_CounterReset() , RTCDRV_DeInit() , and UDELAY_Calibrate() .

void RTC_FreezeEnable ( bool enable )

RTC register synchronization freeze control.

Some RTC registers require synchronization into the low-frequency (LF) domain. The freeze feature allows for several registers to be modified before passing them to the LF domain simultaneously (which takes place when the freeze mode is disabled).

Note: When enabling freeze mode, this function will wait for all current ongoing RTC synchronization to LF domain to complete (normally synchronization will not be in progress.) However, for this reason, when using freeze mode, modifications of registers requiring LF synchronization should be done within one freeze enable/disable block to avoid unnecessary stalling. This only applies to the Gecko Family. See the reference manual chapter about Access to Low Energy Peripherals (Asynchronos Registers) for details.

Parameters

[in]


              enable

True - enable freeze, modified registers are not propagated to the LF domain
False - disables freeze, modified registers are propagated to LF domain

Definition at line 270 of file em_rtc.c .

References RTC , and RTC_FREEZE_REGFREEZE .

Referenced by UDELAY_Calibrate() .

void RTC_Init ( const RTC_Init_TypeDef * init )

Initialize RTC.

Note that the compare values must be set separately with RTC_CompareSet() prior to the use of this function if configuring the RTC to start when initialization is completed.

Note: The initialization of the RTC modifies the RTC CTRL register which requires synchronization into the low-frequency domain. If this register is modified before a previous update to the same register has completed, this function will stall until the previous synchronization has completed. This only applies to the Gecko Family. See comments in the regSync() internal function call.

Parameters

[in] init A pointer to the RTC initialization structure.

Definition at line 311 of file em_rtc.c .

References RTC_Init_TypeDef::comp0Top , RTC_Init_TypeDef::debugRun , RTC_Init_TypeDef::enable , RTC , RTC_CTRL_COMP0TOP , RTC_CTRL_DEBUGRUN , RTC_CTRL_EN , and RTC_SYNCBUSY_CTRL .

Referenced by RTCDRV_Init() , and UDELAY_Calibrate() .

__STATIC_INLINE void RTC_IntClear ( uint32_t flags )

Clear one or more pending RTC interrupts.

Parameters

[in] flags RTC interrupt sources to clear. Use a set of interrupt flags OR-ed together to clear multiple interrupt sources for the RTC module (RTC_IFS_nnn).

Definition at line 134 of file em_rtc.h .

References RTC .

__STATIC_INLINE void RTC_IntDisable ( uint32_t flags )

Disable one or more RTC interrupts.

Parameters

[in] flags RTC interrupt sources to disable. Use a set of interrupt flags OR-ed together to disable multiple interrupt sources for the RTC module (RTC_IFS_nnn).

Definition at line 148 of file em_rtc.h .

References RTC .

__STATIC_INLINE void RTC_IntEnable ( uint32_t flags )

Enable one or more RTC interrupts.

Note: Depending on the use, a pending interrupt may already be set prior to enabling the interrupt. To ignore a pending interrupt, consider using RTC_IntClear() prior to enabling the interrupt.

Parameters

[in] flags RTC interrupt sources to enable. Use a set of interrupt flags OR-ed together to set multiple interrupt sources for the RTC module (RTC_IFS_nnn).

Definition at line 167 of file em_rtc.h .

References RTC .

__STATIC_INLINE uint32_t RTC_IntGet ( void )

Get pending RTC interrupt flags.

Note: Event bits are not cleared by using this function.

Returns: Pending RTC interrupt sources. Returns a set of interrupt flags OR-ed together for multiple interrupt sources in the RTC module (RTC_IFS_nnn).

Definition at line 183 of file em_rtc.h .

References RTC .

__STATIC_INLINE uint32_t RTC_IntGetEnabled ( void )

Get enabled and pending RTC interrupt flags. Useful for handling more interrupt sources in the same interrupt handler.

Note: Interrupt flags are not cleared by using this function.

Returns

Pending and enabled RTC interrupt sources. The return value is the bitwise AND of

the enabled interrupt sources in RTC_IEN and
the pending interrupt flags RTC_IF.

Definition at line 202 of file em_rtc.h .

References RTC .

__STATIC_INLINE void RTC_IntSet ( uint32_t flags )

Set one or more pending RTC interrupts from SW.

Parameters

[in] flags RTC interrupt sources to set to pending. Use a set of interrupt flags OR-ed together to set multiple interrupt sources for the RTC module (RTC_IFS_nnn).

Definition at line 219 of file em_rtc.h .

References RTC .

RTCEMLIB

Detailed Description

Data Structures

Macros

Functions

Macro Definition Documentation

Function Documentation