LLWU: Low-Leakage Wakeup Unit Driver

Overview

The MCUXpresso SDK provides a peripheral driver for the Low-Leakage Wakeup Unit (LLWU) module of MCUXpresso SDK devices. The LLWU module allows the user to select external pin sources and internal modules as a wake-up source from low-leakage power modes.

External wakeup pins configurations

Configures the external wakeup pins' working modes, gets, and clears the wake pin flags. External wakeup pins are accessed by the pinIndex, which is started from 1. Numbers of the external pins depend on the SoC configuration.

Internal wakeup modules configurations

Enables/disables the internal wakeup modules and gets the module flags. Internal modules are accessed by moduleIndex, which is started from 1. Numbers of external pins depend the on SoC configuration.

Digital pin filter for external wakeup pin configurations

Configures the digital pin filter of the external wakeup pins' working modes, gets, and clears the pin filter flags. Digital pin filters are accessed by the filterIndex, which is started from 1. Numbers of external pins depend on the SoC configuration.

Data Structures
struct	llwu_external_pin_filter_mode_t
	An external input pin filter control structure. More...

Enumerations
enum	llwu_external_pin_mode_t {   kLLWU_ExternalPinDisable = 0U,   kLLWU_ExternalPinRisingEdge = 1U,   kLLWU_ExternalPinFallingEdge = 2U,   kLLWU_ExternalPinAnyEdge = 3U }
	External input pin control modes. More...
enum	llwu_pin_filter_mode_t {   kLLWU_PinFilterDisable = 0U,   kLLWU_PinFilterRisingEdge = 1U,   kLLWU_PinFilterFallingEdge = 2U,   kLLWU_PinFilterAnyEdge = 3U }
	Digital filter control modes. More...

Driver version
#define	FSL_LLWU_DRIVER_VERSION   (MAKE_VERSION(2, 0, 1))
	LLWU driver version 2.0.1. More...

Low-Leakage Wakeup Unit Control APIs
void	LLWU_SetExternalWakeupPinMode (LLWU_Type *base, uint32_t pinIndex, llwu_external_pin_mode_t pinMode)
	Sets the external input pin source mode. More...
bool	LLWU_GetExternalWakeupPinFlag (LLWU_Type *base, uint32_t pinIndex)
	Gets the external wakeup source flag. More...
void	LLWU_ClearExternalWakeupPinFlag (LLWU_Type *base, uint32_t pinIndex)
	Clears the external wakeup source flag. More...
void	LLWU_SetPinFilterMode (LLWU_Type *base, uint32_t filterIndex, llwu_external_pin_filter_mode_t filterMode)
	Sets the pin filter configuration. More...
bool	LLWU_GetPinFilterFlag (LLWU_Type *base, uint32_t filterIndex)
	Gets the pin filter configuration. More...
void	LLWU_ClearPinFilterFlag (LLWU_Type *base, uint32_t filterIndex)
	Clears the pin filter configuration. More...

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Data Structure Documentation

struct llwu_external_pin_filter_mode_t

Data Fields
uint32_t	pinIndex
	A pin number.
llwu_pin_filter_mode_t	filterMode
	Filter mode.

Macro Definition Documentation

#define FSL_LLWU_DRIVER_VERSION   (MAKE_VERSION(2, 0, 1))

Enumeration Type Documentation

enum llwu_external_pin_mode_t

Enumerator
kLLWU_ExternalPinDisable	Pin disabled as a wakeup input.
kLLWU_ExternalPinRisingEdge	Pin enabled with the rising edge detection.
kLLWU_ExternalPinFallingEdge	Pin enabled with the falling edge detection.
kLLWU_ExternalPinAnyEdge	Pin enabled with any change detection.

enum llwu_pin_filter_mode_t

Enumerator
kLLWU_PinFilterDisable	Filter disabled.
kLLWU_PinFilterRisingEdge	Filter positive edge detection.
kLLWU_PinFilterFallingEdge	Filter negative edge detection.
kLLWU_PinFilterAnyEdge	Filter any edge detection.

Function Documentation

void LLWU_SetExternalWakeupPinMode	(	LLWU_Type *	base,
		uint32_t	pinIndex,
		llwu_external_pin_mode_t	pinMode
	)

This function sets the external input pin source mode that is used as a wake up source.

Parameters

base	LLWU peripheral base address.
pinIndex	A pin index to be enabled as an external wakeup source starting from 1.
pinMode	A pin configuration mode defined in the llwu_external_pin_modes_t.

bool LLWU_GetExternalWakeupPinFlag	(	LLWU_Type *	base,
		uint32_t	pinIndex
	)

This function checks the external pin flag to detect whether the MCU is woken up by the specific pin.

Parameters

base	LLWU peripheral base address.
pinIndex	A pin index, which starts from 1.

Returns

True if the specific pin is a wakeup source.

void LLWU_ClearExternalWakeupPinFlag	(	LLWU_Type *	base,
		uint32_t	pinIndex
	)

This function clears the external wakeup source flag for a specific pin.

Parameters

base	LLWU peripheral base address.
pinIndex	A pin index, which starts from 1.

void LLWU_SetPinFilterMode	(	LLWU_Type *	base,
		uint32_t	filterIndex,
		llwu_external_pin_filter_mode_t	filterMode
	)

This function sets the pin filter configuration.

Parameters

base	LLWU peripheral base address.
filterIndex	A pin filter index used to enable/disable the digital filter, starting from 1.
filterMode	A filter mode configuration

bool LLWU_GetPinFilterFlag	(	LLWU_Type *	base,
		uint32_t	filterIndex
	)

This function gets the pin filter flag.

Parameters

base	LLWU peripheral base address.
filterIndex	A pin filter index, which starts from 1.

Returns

True if the flag is a source of the existing low-leakage power mode.

void LLWU_ClearPinFilterFlag	(	LLWU_Type *	base,
		uint32_t	filterIndex
	)

This function clears the pin filter flag.

Parameters

base	LLWU peripheral base address.
filterIndex	A pin filter index to clear the flag, starting from 1.