Description

Low Energy Timer (LETIMER) Peripheral API.

This module contains functions to control the LETIMER peripheral of Silicon Labs 32-bit MCUs and SoCs. The LETIMER is a down-counter that can keep track of time and output configurable waveforms.

Data Structures
struct	LETIMER_Init_TypeDef
	LETIMER initialization structure.

Functions
uint32_t	LETIMER_CompareGet (LETIMER_TypeDef *letimer, unsigned int comp)
	Get the LETIMER compare register value.

void	LETIMER_CompareSet (LETIMER_TypeDef *letimer, unsigned int comp, uint32_t value)
	Set the LETIMER compare register value.

uint32_t	LETIMER_CounterGet (LETIMER_TypeDef *letimer)
	Get LETIMER counter value.

void	LETIMER_CounterSet (LETIMER_TypeDef *letimer, uint32_t value)
	Set LETIMER counter value.

void	LETIMER_Enable (LETIMER_TypeDef *letimer, bool enable)
	Start/stop LETIMER.

void	LETIMER_FreezeEnable (LETIMER_TypeDef *letimer, bool enable)
	LETIMER register synchronization freeze control.

void	LETIMER_Init (LETIMER_TypeDef letimer, const LETIMER_Init_TypeDef init)
	Initialize LETIMER.

void	LETIMER_IntClear (LETIMER_TypeDef *letimer, uint32_t flags)
	Clear one or more pending LETIMER interrupts.

void	LETIMER_IntDisable (LETIMER_TypeDef *letimer, uint32_t flags)
	Disable one or more LETIMER interrupts.

void	LETIMER_IntEnable (LETIMER_TypeDef *letimer, uint32_t flags)
	Enable one or more LETIMER interrupts.

uint32_t	LETIMER_IntGet (LETIMER_TypeDef *letimer)
	Get pending LETIMER interrupt flags.

uint32_t	LETIMER_IntGetEnabled (LETIMER_TypeDef *letimer)
	Get enabled and pending LETIMER interrupt flags.

void	LETIMER_IntSet (LETIMER_TypeDef *letimer, uint32_t flags)
	Set one or more pending LETIMER interrupts from SW.

uint32_t	LETIMER_RepeatGet (LETIMER_TypeDef *letimer, unsigned int rep)
	Get the LETIMER repeat register value.

void	LETIMER_RepeatSet (LETIMER_TypeDef *letimer, unsigned int rep, uint32_t value)
	Set the LETIMER repeat counter register value.

void	LETIMER_Reset (LETIMER_TypeDef *letimer)
	Reset LETIMER to the same state that it was in after a hardware reset.

void	LETIMER_SyncWait (LETIMER_TypeDef *letimer)
	Wait for the LETIMER to complete all synchronization of register changes and commands.

void	LETIMER_TopSet (LETIMER_TypeDef *letimer, uint32_t value)
	Set the LETIMER top value.

uint32_t	LETIMER_TopGet (LETIMER_TypeDef *letimer)
	Get the current LETIMER top value.

Macros
#define	LETIMER_INIT_DEFAULT
	Default configuration for LETIMER initialization structure.

Enumerations
enum	LETIMER_RepeatMode_TypeDef { letimerRepeatFree = _LETIMER_CTRL_REPMODE_FREE, letimerRepeatOneshot = _LETIMER_CTRL_REPMODE_ONESHOT, letimerRepeatBuffered = _LETIMER_CTRL_REPMODE_BUFFERED, letimerRepeatDouble = _LETIMER_CTRL_REPMODE_DOUBLE }
	Repeat mode.

enum	LETIMER_UFOA_TypeDef { letimerUFOANone = _LETIMER_CTRL_UFOA0_NONE, letimerUFOAToggle = _LETIMER_CTRL_UFOA0_TOGGLE, letimerUFOAPulse = _LETIMER_CTRL_UFOA0_PULSE, letimerUFOAPwm = _LETIMER_CTRL_UFOA0_PWM }
	Underflow action on output.

Function Documentation

◆ LETIMER_CompareGet()

uint32_t LETIMER_CompareGet	(	LETIMER_TypeDef *	`letimer,`
		unsigned int	`comp`
	)

Get the LETIMER compare register value.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`comp`	A compare register to get, either 0 or 1.

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

◆ LETIMER_CompareSet()

void LETIMER_CompareSet	(	LETIMER_TypeDef *	`letimer,`
		unsigned int	`comp,`
		uint32_t	`value`
	)

Set the LETIMER 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 LETIMER_Sync() internal function call.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`comp`	A compare register to set, either 0 or 1.
[in]	`value`	An initialization value (<= 0x0000ffff).

◆ LETIMER_CounterGet()

uint32_t LETIMER_CounterGet ( LETIMER_TypeDef * letimer )

Get LETIMER counter value.

Parameters

[in] letimer Pointer to the LETIMER peripheral register block.

Returns: Current LETIMER counter value.

◆ LETIMER_CounterSet()

void LETIMER_CounterSet	(	LETIMER_TypeDef *	`letimer,`
		uint32_t	`value`
	)

Set LETIMER counter value.

Parameters

[in]	`letimer`	Pointer to the LETIMER peripheral register block.
[in]	`value`	New counter value.

◆ LETIMER_Enable()

void LETIMER_Enable	(	LETIMER_TypeDef *	`letimer,`
		bool	`enable`
	)

Start/stop LETIMER.

Note: The enabling/disabling of the LETIMER modifies the LETIMER CMD 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 LETIMER_Sync() internal function call.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`enable`	True to enable counting, false to disable.

◆ LETIMER_FreezeEnable()

void LETIMER_FreezeEnable	(	LETIMER_TypeDef *	`letimer,`
		bool	`enable`
	)

LETIMER register synchronization freeze control.

Some LETIMER registers require synchronization into the low-frequency (LF) domain. The freeze feature allows for several such 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 LETIMER synchronization to the LF domain to complete (Normally synchronization will not be in progress.) However, for this reason, when using freeze mode, modifications of registers requiring the LF synchronization should be done within one freeze enable/disable block to avoid unecessary stalling.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`enable`	True - enable freeze, modified registers are not propagated to the LF domain False - disables freeze, modified registers are propagated to the LF domain

◆ LETIMER_Init()

void LETIMER_Init	(	LETIMER_TypeDef *	`letimer,`
		const LETIMER_Init_TypeDef *	`init`
	)

Initialize LETIMER.

Note that the compare/repeat values must be set separately with LETIMER_CompareSet() and LETIMER_RepeatSet() . That should probably be done prior using this function if configuring the LETIMER to start when initialization is complete.

Note: The initialization of the LETIMER modifies the LETIMER CTRL/CMD registers which require synchronization into the low-frequency domain. If any of those registers are 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 LETIMER_Sync() internal function call.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`init`	A pointer to the LETIMER initialization structure.

◆ LETIMER_IntClear()

void LETIMER_IntClear	(	LETIMER_TypeDef *	`letimer,`
		uint32_t	`flags`
	)

inline

Clear one or more pending LETIMER interrupts.

Parameters

[in]	`letimer`	Pointer to LETIMER peripheral register block.
[in]	`flags`	Pending LETIMER interrupt source to clear. Use a bitwise logic OR combination of valid interrupt flags for the LETIMER module (LETIMER_IF_nnn).

◆ LETIMER_IntDisable()

void LETIMER_IntDisable	(	LETIMER_TypeDef *	`letimer,`
		uint32_t	`flags`
	)

inline

Disable one or more LETIMER interrupts.

Parameters

[in]	`letimer`	Pointer to LETIMER peripheral register block.
[in]	`flags`	LETIMER interrupt sources to disable. Use a bitwise logic OR combination of valid interrupt flags for the LETIMER module (LETIMER_IF_nnn).

◆ LETIMER_IntEnable()

void LETIMER_IntEnable	(	LETIMER_TypeDef *	`letimer,`
		uint32_t	`flags`
	)

inline

Enable one or more LETIMER 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 LETIMER_IntClear() prior to enabling the interrupt.

Parameters

[in]	`letimer`	Pointer to the LETIMER peripheral register block.
[in]	`flags`	LETIMER interrupt sources to enable. Use a bitwise logic OR combination of valid interrupt flags for the LETIMER module (LETIMER_IF_nnn).

◆ LETIMER_IntGet()

uint32_t LETIMER_IntGet ( LETIMER_TypeDef * letimer )

inline

Get pending LETIMER interrupt flags.

Note: Event bits are not cleared by the use of this function.

Parameters

[in] letimer Pointer to LETIMER peripheral register block.

Returns: LETIMER interrupt sources pending. A bitwise logic OR combination of valid interrupt flags for the LETIMER module (LETIMER_IF_nnn).

◆ LETIMER_IntGetEnabled()

uint32_t LETIMER_IntGetEnabled ( LETIMER_TypeDef * letimer )

inline

Get enabled and pending LETIMER interrupt flags.

Useful for handling more interrupt sources in the same interrupt handler.

Note: Event bits are not cleared by the use of this function.

Parameters

[in] letimer Pointer to LETIMER peripheral register block.

Returns

Pending and enabled LETIMER interrupt sources. Return value is the bitwise AND combination of

the OR combination of enabled interrupt sources in LETIMER_IEN_nnn register (LETIMER_IEN_nnn) and
the OR combination of valid interrupt flags of the LETIMER module (LETIMER_IF_nnn).

◆ LETIMER_IntSet()

void LETIMER_IntSet	(	LETIMER_TypeDef *	`letimer,`
		uint32_t	`flags`
	)

inline

Set one or more pending LETIMER interrupts from SW.

Parameters

[in]	`letimer`	Pointer to LETIMER peripheral register block.
[in]	`flags`	LETIMER interrupt sources to set to pending. Use a bitwise logic OR combination of valid interrupt flags for the LETIMER module (LETIMER_IF_nnn).

◆ LETIMER_RepeatGet()

uint32_t LETIMER_RepeatGet	(	LETIMER_TypeDef *	`letimer,`
		unsigned int	`rep`
	)

Get the LETIMER repeat register value.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`rep`	Repeat register to get, either 0 or 1.

Returns: Repeat register value, 0 if invalid register selected.

◆ LETIMER_RepeatSet()

void LETIMER_RepeatSet	(	LETIMER_TypeDef *	`letimer,`
		unsigned int	`rep,`
		uint32_t	`value`
	)

Set the LETIMER repeat counter register value.

Note: The setting of a repeat counter 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 LETIMER_Sync() internal function call.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`rep`	Repeat counter register to set, either 0 or 1.
[in]	`value`	An initialization value (<= 0x0000ffff).

◆ LETIMER_Reset()

void LETIMER_Reset ( LETIMER_TypeDef * letimer )

Reset LETIMER to the same state that it was in after a hardware reset.

Note: The ROUTE register is NOT reset by this function to allow for a centralized setup of this feature.

Parameters

[in] letimer A pointer to the LETIMER peripheral register block.

◆ LETIMER_SyncWait()

void LETIMER_SyncWait ( LETIMER_TypeDef * letimer )

Wait for the LETIMER to complete all synchronization of register changes and commands.

Parameters

[in] letimer A pointer to the LETIMER peripheral register block.

◆ LETIMER_TopSet()

void LETIMER_TopSet	(	LETIMER_TypeDef *	`letimer,`
		uint32_t	`value`
	)

Set the LETIMER top value.

Note: The LETIMER is a down-counter, so when the counter reaches 0 then the top value will be loaded into the counter. This function can be used to set the top value.

If the LETIMER is not already configured to use a top value then this function will enable that functionality for the user.

Parameters

[in]	`letimer`	A pointer to the LETIMER peripheral register block.
[in]	`value`	The top value. This can be a 16 bit value on series-0 and series-1 devices and a 24 bit value on series-2 devices.

◆ LETIMER_TopGet()

uint32_t LETIMER_TopGet ( LETIMER_TypeDef * letimer )

Get the current LETIMER top value.

Parameters

[in] letimer A pointer to the LETIMER peripheral register block.

Returns: The top value. This will be a 16 bit value on series-0 and series-1 devices and a 24 bit value on series-2 devices.

Macro Definition Documentation

◆ LETIMER_INIT_DEFAULT

#define LETIMER_INIT_DEFAULT

Value:

         {                                                                            \
        
         true,
         
          /* Enable timer when initialization completes. */
         
         \
        
         false,
         
          /* Stop counter during debug halt. */
         
         \
        
         false,
         
          /* Do not start counting on RTC COMP0 match. */
         
         \
        
         false,
         
          /* Do not start counting on RTC COMP1 match. */
         
         \
        
         false,
         
          /* Do not load COMP0 into CNT on underflow. */
         
         \
        
         false,
         
          /* Do not load COMP1 into COMP0 when REP0 reaches 0. */
         
         \
        
         0,
         
          /* Idle value 0 for output 0. */
         
         \
        
         0,
         
          /* Idle value 0 for output 1. */
         
         \
        
         letimerUFOANone,
         
          /* No action on underflow on output 0. */
         
         \
        
         letimerUFOANone,
         
          /* No action on underflow on output 1. */
         
         \
        
         letimerRepeatFree,
         
          /* Count until stopped by SW. */
         
         \
        
         0
         
          /* Use default top Value. */
         
         \
        
         }

Default configuration for LETIMER initialization structure.

Enumeration Type Documentation

◆ LETIMER_RepeatMode_TypeDef

enum LETIMER_RepeatMode_TypeDef

Repeat mode.

Enumerator
letimerRepeatFree	Count until stopped by SW.
letimerRepeatOneshot	Count REP0 times.
letimerRepeatBuffered	Count REP0 times, if REP1 has been written to, it is loaded into REP0 when REP0 is about to be decremented to 0.
letimerRepeatDouble	Run as long as both REP0 and REP1 are not 0. Both REP0 and REP1 are decremented when counter underflows.

◆ LETIMER_UFOA_TypeDef

enum LETIMER_UFOA_TypeDef

Underflow action on output.

Enumerator
letimerUFOANone	No output action.
letimerUFOAToggle	Toggle output when counter underflows.
letimerUFOAPulse	Hold output one LETIMER clock cycle when counter underflows.
letimerUFOAPwm	Set output idle when counter underflows, and active when matching COMP1.

LETIMER - Low Energy Timer

Description

Data Structures

Functions

Macros

Enumerations

Function Documentation

◆ LETIMER_CompareGet()

◆ LETIMER_CompareSet()

◆ LETIMER_CounterGet()

◆ LETIMER_CounterSet()

◆ LETIMER_Enable()

◆ LETIMER_FreezeEnable()

◆ LETIMER_Init()

◆ LETIMER_IntClear()

◆ LETIMER_IntDisable()

◆ LETIMER_IntEnable()

◆ LETIMER_IntGet()

◆ LETIMER_IntGetEnabled()

◆ LETIMER_IntSet()

◆ LETIMER_RepeatGet()

◆ LETIMER_RepeatSet()

◆ LETIMER_Reset()

◆ LETIMER_SyncWait()

◆ LETIMER_TopSet()

◆ LETIMER_TopGet()

Macro Definition Documentation

◆ LETIMER_INIT_DEFAULT

Enumeration Type Documentation

◆ LETIMER_RepeatMode_TypeDef

◆ LETIMER_UFOA_TypeDef