Overview

The MCUXpresso SDK provides a driver for the IRTC module of MCUXpresso SDK devices.

Data Structures
struct	irtc_datetime_t
	Structure is used to hold the date and time. More...

struct	irtc_daylight_time_t
	Structure is used to hold the daylight saving time. More...

struct	irtc_tamper_config_t
	Structure is used to define the parameters to configure a RTC tamper event. More...

struct	irtc_config_t
	RTC config structure. More...

Enumerations
enum	irtc_filter_clock_source_t { kIRTC_32K = 0x0, kIRTC_512 = 0x1, kIRTC_128 = 0x2, kIRTC_64 = 0x3, kIRTC_16 = 0x4, kIRTC_8 = 0x5, kIRTC_4 = 0x6, kIRTC_2 = 0x7 }
	IRTC filter clock source options. More...

enum	irtc_tamper_pins_t { kIRTC_Tamper_0 = 0U, kIRTC_Tamper_1, kIRTC_Tamper_2, kIRTC_Tamper_3 }
	IRTC Tamper pins. More...

enum	irtc_interrupt_enable_t { kIRTC_TamperInterruptEnable = RTC_IER_TAMPER_IE_MASK, kIRTC_AlarmInterruptEnable = RTC_IER_ALM_IE_MASK, kIRTC_DayInterruptEnable = RTC_IER_DAY_IE_MASK, kIRTC_HourInterruptEnable = RTC_IER_HOUR_IE_MASK, kIRTC_MinInterruptEnable = RTC_IER_MIN_IE_MASK, kIRTC_1hzInterruptEnable = RTC_IER_IE_1HZ_MASK, kIRTC_2hzInterruptEnable = RTC_IER_IE_2HZ_MASK, kIRTC_4hzInterruptEnable = RTC_IER_IE_4HZ_MASK, kIRTC_8hzInterruptEnable = RTC_IER_IE_8HZ_MASK, kIRTC_16hzInterruptEnable = RTC_IER_IE_16HZ_MASK, kIRTC_32hzInterruptEnable = RTC_IER_IE_32HZ_MASK, kIRTC_64hzInterruptEnable = RTC_IER_IE_64HZ_MASK, kIRTC_128hzInterruptEnable = RTC_IER_IE_128HZ_MASK, kIRTC_256hzInterruptEnable = RTC_IER_IE_256HZ_MASK, kIRTC_512hzInterruptEnable = RTC_IER_IE_512HZ_MASK }
	List of IRTC interrupts. More...

enum	irtc_status_flags_t { kIRTC_TamperFlag = RTC_ISR_TAMPER_IS_MASK, kIRTC_AlarmFlag = RTC_ISR_ALM_IS_MASK, kIRTC_DayFlag = RTC_ISR_DAY_IS_MASK, kIRTC_HourFlag = RTC_ISR_HOUR_IS_MASK, kIRTC_MinFlag = RTC_ISR_MIN_IS_MASK, kIRTC_1hzFlag = RTC_ISR_IS_1HZ_MASK, kIRTC_2hzFlag = RTC_ISR_IS_2HZ_MASK, kIRTC_4hzFlag = RTC_ISR_IS_4HZ_MASK, kIRTC_8hzFlag = RTC_ISR_IS_8HZ_MASK, kIRTC_16hzFlag = RTC_ISR_IS_16HZ_MASK, kIRTC_32hzFlag = RTC_ISR_IS_32HZ_MASK, kIRTC_64hzFlag = RTC_ISR_IS_64HZ_MASK, kIRTC_128hzFlag = RTC_ISR_IS_128HZ_MASK, kIRTC_256hzFlag = RTC_ISR_IS_256HZ_MASK, kIRTC_512hzFlag = RTC_ISR_IS_512HZ_MASK, kIRTC_InvalidFlag = (RTC_STATUS_INVAL_BIT_MASK << 16), kIRTC_WriteProtFlag = (RTC_STATUS_WRITE_PROT_EN_MASK << 16), kIRTC_CpuLowVoltFlag = (RTC_STATUS_CPU_LOW_VOLT_MASK << 16), kIRTC_ResetSrcFlag = (RTC_STATUS_RST_SRC_MASK << 16), kIRTC_CmpIntFlag = (RTC_STATUS_CMP_INT_MASK << 16), kIRTC_BusErrFlag = (RTC_STATUS_BUS_ERR_MASK << 16), kIRTC_CmpDoneFlag = (RTC_STATUS_CMP_DONE_MASK << 16) }
	List of IRTC flags. More...

enum	irtc_alarm_match_t { kRTC_MatchSecMinHr = 0, kRTC_MatchSecMinHrDay = 1, kRTC_MatchSecMinHrDayMnth = 2, kRTC_MatchSecMinHrDayMnthYr = 3 }
	IRTC alarm match options. More...

enum	irtc_osc_cap_load_t { kIRTC_Capacitor2p = (1U << 1), kIRTC_Capacitor4p = (1U << 2), kIRTC_Capacitor8p = (1U << 3), kIRTC_Capacitor16p = (1U << 4) }
	List of RTC Oscillator capacitor load settings. More...

Functions
static void	IRTC_SetOscCapLoad (RTC_Type *base, uint16_t capLoad)
	This function sets the specified capacitor configuration for the RTC oscillator. More...

status_t	IRTC_SetWriteProtection (RTC_Type *base, bool lock)
	Locks or unlocks IRTC registers for write access. More...

static void	IRTC_Reset (RTC_Type *base)
	Performs a software reset on the IRTC module. More...

Driver version
#define	FSL_IRTC_DRIVER_VERSION (MAKE_VERSION(2, 0, 0))
	Version 2.0.0.

Initialization and deinitialization
status_t	IRTC_Init (RTC_Type base, const irtc_config_t config)
	Ungates the IRTC clock and configures the peripheral for basic operation. More...

static void	IRTC_Deinit (RTC_Type *base)
	Gate the IRTC clock. More...

void	IRTC_GetDefaultConfig (irtc_config_t *config)
	Fill in the IRTC config struct with the default settings. More...

Current Time & Alarm
status_t	IRTC_SetDatetime (RTC_Type base, const irtc_datetime_t datetime)
	Sets the IRTC date and time according to the given time structure. More...

void	IRTC_GetDatetime (RTC_Type base, irtc_datetime_t datetime)
	Gets the IRTC time and stores it in the given time structure. More...

status_t	IRTC_SetAlarm (RTC_Type base, const irtc_datetime_t alarmTime)
	Sets the IRTC alarm time. More...

void	IRTC_GetAlarm (RTC_Type base, irtc_datetime_t datetime)
	Returns the IRTC alarm time. More...

Interrupt Interface
static void	IRTC_EnableInterrupts (RTC_Type *base, uint32_t mask)
	Enables the selected IRTC interrupts. More...

static void	IRTC_DisableInterrupts (RTC_Type *base, uint32_t mask)
	Disables the selected IRTC interrupts. More...

static uint16_t	IRTC_GetEnabledInterrupts (RTC_Type *base)
	Gets the enabled IRTC interrupts. More...

Status Interface
static uint32_t	IRTC_GetStatusFlags (RTC_Type *base)
	Gets the IRTC status flags. More...

static void	IRTC_ClearStatusFlags (RTC_Type *base, uint32_t mask)
	Clears the IRTC status flags. More...

Daylight Savings Interface
void	IRTC_SetDaylightTime (RTC_Type base, const irtc_daylight_time_t datetime)
	Sets the IRTC daylight savings start and stop date and time. More...

void	IRTC_GetDaylightTime (RTC_Type base, irtc_daylight_time_t datetime)
	Gets the IRTC daylight savings time and stores it in the given time structure. More...

Time Compensation Interface
void	IRTC_SetCoarseCompensation (RTC_Type *base, uint8_t compensationValue, uint8_t compensationInterval)
	Enables the coarse compensation and sets the value in the IRTC compensation register. More...

void	IRTC_SetFineCompensation (RTC_Type *base, uint8_t integralValue, uint8_t fractionValue, bool accumulateFractional)
	Enables the fine compensation and sets the value in the IRTC compensation register. More...

Tamper Interface
void	IRTC_SetTamperParams (RTC_Type base, irtc_tamper_pins_t tamperNumber, const irtc_tamper_config_t tamperConfig)
	This function allows configuring the four tamper inputs. More...

Data Structure Documentation

struct irtc_datetime_t

Data Fields
uint16_t	year
	Range from 1984 to 2239. More...

uint8_t	month
	Range from 1 to 12. More...

uint8_t	day
	Range from 1 to 31 (depending on month). More...

uint8_t	weekDay
	Range from 0(Sunday) to 6(Saturday). More...

uint8_t	hour
	Range from 0 to 23. More...

uint8_t	minute
	Range from 0 to 59. More...

uint8_t	second
	Range from 0 to 59. More...

Field Documentation

uint16_t irtc_datetime_t::year

uint8_t irtc_datetime_t::month

uint8_t irtc_datetime_t::day

uint8_t irtc_datetime_t::weekDay

uint8_t irtc_datetime_t::hour

uint8_t irtc_datetime_t::minute

uint8_t irtc_datetime_t::second

struct irtc_daylight_time_t

Data Fields
uint8_t	startMonth
	Range from 1 to 12.

uint8_t	endMonth
	Range from 1 to 12.

uint8_t	startDay
	Range from 1 to 31 (depending on month)

uint8_t	endDay
	Range from 1 to 31 (depending on month)

uint8_t	startHour
	Range from 0 to 23.

uint8_t	endHour
	Range from 0 to 23.

struct irtc_tamper_config_t

Data Fields
bool	pinPolarity
	true: tamper has active low polarity; false: active high polarity

irtc_filter_clock_source_t	filterClk
	Clock source for the tamper filter.

uint8_t	filterDuration
	Tamper filter duration. More...

Field Documentation

uint8_t irtc_tamper_config_t::filterDuration

struct irtc_config_t

This structure holds the configuration settings for the RTC peripheral. To initialize this structure to reasonable defaults, call the IRTC_GetDefaultConfig() function and pass a pointer to your config structure instance.

The config struct can be made const so it resides in flash

Data Fields
bool	wakeupSelect
	true: Tamper pin 0 is used to wakeup the chip; false: Tamper pin 0 is used as the tamper pin

bool	timerStdMask
	true: Sampling clocks gated in standby mode; false: Sampling clocks not gated

irtc_alarm_match_t	alrmMatch
	Pick one option from enumeration :: irtc_alarm_match_t.

Enumeration Type Documentation

enum irtc_filter_clock_source_t

Enumerator
kIRTC_32K	Use 32 kHz clock source for the tamper filter.
kIRTC_512	Use 512 Hz clock source for the tamper filter.
kIRTC_128	Use 128 Hz clock source for the tamper filter.
kIRTC_64	Use 64 Hz clock source for the tamper filter.
kIRTC_16	Use 16 Hz clock source for the tamper filter.
kIRTC_8	Use 8 Hz clock source for the tamper filter.
kIRTC_4	Use 4 Hz clock source for the tamper filter.
kIRTC_2	Use 2 Hz clock source for the tamper filter.

enum irtc_tamper_pins_t

Enumerator
kIRTC_Tamper_0	External Tamper 0.
kIRTC_Tamper_1	External Tamper 1.
kIRTC_Tamper_2	External Tamper 2.
kIRTC_Tamper_3	Internal tamper, does not have filter configuration.

enum irtc_interrupt_enable_t

Enumerator
kIRTC_TamperInterruptEnable	Tamper Interrupt Enable.
kIRTC_AlarmInterruptEnable	Alarm Interrupt Enable.
kIRTC_DayInterruptEnable	Days Interrupt Enable.
kIRTC_HourInterruptEnable	Hours Interrupt Enable.
kIRTC_MinInterruptEnable	Minutes Interrupt Enable.
kIRTC_1hzInterruptEnable	1 Hz interval Interrupt Enable
kIRTC_2hzInterruptEnable	2 Hz interval Interrupt Enable
kIRTC_4hzInterruptEnable	4 Hz interval Interrupt Enable
kIRTC_8hzInterruptEnable	8 Hz interval Interrupt Enable
kIRTC_16hzInterruptEnable	16 Hz interval Interrupt Enable
kIRTC_32hzInterruptEnable	32 Hz interval Interrupt Enable
kIRTC_64hzInterruptEnable	64 Hz interval Interrupt Enable
kIRTC_128hzInterruptEnable	128 Hz interval Interrupt Enable
kIRTC_256hzInterruptEnable	256 Hz interval Interrupt Enable
kIRTC_512hzInterruptEnable	512 Hz interval Interrupt Enable

enum irtc_status_flags_t

Enumerator
kIRTC_TamperFlag	Tamper Status flag.
kIRTC_AlarmFlag	Alarm Status flag.
kIRTC_DayFlag	Days Status flag.
kIRTC_HourFlag	Hour Status flag.
kIRTC_MinFlag	Minutes Status flag.
kIRTC_1hzFlag	1 Hz interval status flag
kIRTC_2hzFlag	2 Hz interval status flag
kIRTC_4hzFlag	4 Hz interval status flag
kIRTC_8hzFlag	8 Hz interval status flag
kIRTC_16hzFlag	16 Hz interval status flag
kIRTC_32hzFlag	32 Hz interval status flag
kIRTC_64hzFlag	64 Hz interval status flag
kIRTC_128hzFlag	128 Hz interval status flag
kIRTC_256hzFlag	256 Hz interval status flag
kIRTC_512hzFlag	512 Hz interval status flag
kIRTC_InvalidFlag	Indicates if time/date counters are invalid.
kIRTC_WriteProtFlag	Write protect enable status flag.
kIRTC_CpuLowVoltFlag	CPU low voltage warning flag.
kIRTC_ResetSrcFlag	Reset source flag.
kIRTC_CmpIntFlag	Compensation interval status flag.
kIRTC_BusErrFlag	Bus error flag.
kIRTC_CmpDoneFlag	Compensation done flag.

enum irtc_alarm_match_t

Enumerator
kRTC_MatchSecMinHr	Only match second, minute and hour.
kRTC_MatchSecMinHrDay	Only match second, minute, hour and day.
kRTC_MatchSecMinHrDayMnth	Only match second, minute, hour, day and month.
kRTC_MatchSecMinHrDayMnthYr	Only match second, minute, hour, day, month and year.

enum irtc_osc_cap_load_t

Enumerator
kIRTC_Capacitor2p	2pF capacitor load
kIRTC_Capacitor4p	4pF capacitor load
kIRTC_Capacitor8p	8pF capacitor load
kIRTC_Capacitor16p	16pF capacitor load

Function Documentation

status_t IRTC_Init	(	RTC_Type *	base,
		const irtc_config_t *	config
	)

This function initiates a soft-reset of the IRTC module, this has not effect on DST, calendaring, standby time and tamper detect registers.

Note: This API should be called at the beginning of the application using the IRTC driver.

Parameters

base	IRTC peripheral base address
config	Pointer to user's IRTC config structure.

Returns: kStatus_Fail if we cannot disable register write protection

static void IRTC_Deinit ( RTC_Type * base )

inlinestatic

Parameters

base	IRTC peripheral base address

void IRTC_GetDefaultConfig ( irtc_config_t * config )

The default values are:

*    config->wakeupSelect = true;
*    config->timerStdMask = false;
*    config->alrmMatch = kRTC_MatchSecMinHr;
* 

Parameters

config Pointer to user's IRTC config structure.

status_t IRTC_SetDatetime	(	RTC_Type *	base,
		const irtc_datetime_t *	datetime
	)

The IRTC counter is started after the time is set.

Parameters

base	IRTC peripheral base address
datetime	Pointer to structure where the date and time details to set are stored

Returns: kStatus_Success: success in setting the time and starting the IRTC kStatus_InvalidArgument: failure. An error occurs because the datetime format is incorrect.

void IRTC_GetDatetime	(	RTC_Type *	base,
		irtc_datetime_t *	datetime
	)

Parameters

base	IRTC peripheral base address
datetime	Pointer to structure where the date and time details are stored.

status_t IRTC_SetAlarm	(	RTC_Type *	base,
		const irtc_datetime_t *	alarmTime
	)

Parameters

base	RTC peripheral base address
alarmTime	Pointer to structure where the alarm time is stored.

Note: weekDay field of alarmTime is not used during alarm match and should be set to 0

Returns: kStatus_Success: success in setting the alarm kStatus_InvalidArgument: error in setting the alarm. Error occurs because the alarm datetime format is incorrect.

void IRTC_GetAlarm	(	RTC_Type *	base,
		irtc_datetime_t *	datetime
	)

Parameters

base	RTC peripheral base address
datetime	Pointer to structure where the alarm date and time details are stored.

static void IRTC_EnableInterrupts	(	RTC_Type *	base,
		uint32_t	mask
	)

inlinestatic

Parameters

base	IRTC peripheral base address
mask	The interrupts to enable. This is a logical OR of members of the enumeration ::rtc_interrupt_enable_t

static void IRTC_DisableInterrupts	(	RTC_Type *	base,
		uint32_t	mask
	)

inlinestatic

Parameters

base	IRTC peripheral base address
mask	The interrupts to enable. This is a logical OR of members of the enumeration ::rtc_interrupt_enable_t

static uint16_t IRTC_GetEnabledInterrupts ( RTC_Type * base )

inlinestatic

Parameters

base	IRTC peripheral base address

Returns: The enabled interrupts. This is the logical OR of members of the enumeration ::rtc_interrupt_enable_t

static uint32_t IRTC_GetStatusFlags ( RTC_Type * base )

inlinestatic

Parameters

base	IRTC peripheral base address

Returns: The status flags. This is the logical OR of members of the enumeration irtc_status_flags_t

static void IRTC_ClearStatusFlags	(	RTC_Type *	base,
		uint32_t	mask
	)

inlinestatic

Parameters

base	IRTC peripheral base address
mask	The status flags to clear. This is a logical OR of members of the enumeration irtc_status_flags_t

static void IRTC_SetOscCapLoad	(	RTC_Type *	base,
		uint16_t	capLoad
	)

inlinestatic

Parameters

base	IRTC peripheral base address
capLoad	Oscillator loads to enable. This is a logical OR of members of the enumeration irtc_osc_cap_load_t

status_t IRTC_SetWriteProtection	(	RTC_Type *	base,
		bool	lock
	)

Note: When the registers are unlocked, they remain in unlocked state for 2 seconds, after which they are locked automatically. After power-on-reset, the registers come out unlocked and they are locked automatically 15 seconds after power on.

Parameters

base	IRTC peripheral base address
lock	true: Lock IRTC registers; false: Unlock IRTC registers.

Returns: kStatus_Success: if lock or unlock operation is successful kStatus_Fail: if lock or unlock operation fails even after multiple retry attempts

static void IRTC_Reset ( RTC_Type * base )

inlinestatic

Clears contents of alarm, interrupt (status and enable except tamper interrupt enable bit) registers, STATUS[CMP_DONE] and STATUS[BUS_ERR]. This has no effect on DST, calendaring, standby time and tamper detect registers.

Parameters

base	IRTC peripheral base address

void IRTC_SetDaylightTime	(	RTC_Type *	base,
		const irtc_daylight_time_t *	datetime
	)

It also enables the daylight saving bit in the IRTC control register

Parameters

base	IRTC peripheral base address
datetime	Pointer to a structure where the date and time details are stored.

void IRTC_GetDaylightTime	(	RTC_Type *	base,
		irtc_daylight_time_t *	datetime
	)

Parameters

base	IRTC peripheral base address
datetime	Pointer to a structure where the date and time details are stored.

void IRTC_SetCoarseCompensation	(	RTC_Type *	base,
		uint8_t	compensationValue,
		uint8_t	compensationInterval
	)

Parameters

base	IRTC peripheral base address
compensationValue	Compensation value is a 2's complement value.
compensationInterval	Compensation interval.

void IRTC_SetFineCompensation	(	RTC_Type *	base,
		uint8_t	integralValue,
		uint8_t	fractionValue,
		bool	accumulateFractional
	)

Parameters

base	The IRTC peripheral base address
integralValue	Compensation integral value; twos complement value of the integer part
fractionValue	Compensation fraction value expressed as number of clock cycles of a fixed 4.194304Mhz clock that have to be added.
accumulateFractional	Flag indicating if we want to add to previous fractional part; true: Add to previously accumulated fractional part, false: Start afresh and overwrite current value

void IRTC_SetTamperParams	(	RTC_Type *	base,
		irtc_tamper_pins_t	tamperNumber,
		const irtc_tamper_config_t *	tamperConfig
	)

The function configures the filter properties for the three external tampers. It also sets up active/passive and direction of the tamper bits, which are not available on all platforms.

Note: This function programs the tamper filter parameters. The user must gate the 32K clock to the RTC before calling this function. It is assumed that the time and date are set after this and the tamper parameters do not require to be changed again later.

Parameters

base	The IRTC peripheral base address
tamperNumber	The IRTC tamper input to configure
tamperConfig	The IRTC tamper properties

Overview

Data Structures

Enumerations

Functions

Driver version

Initialization and deinitialization

Current Time & Alarm

Interrupt Interface

Status Interface

Daylight Savings Interface

Time Compensation Interface

Tamper Interface

Data Structure Documentation

Data Fields

Field Documentation

Data Fields

Data Fields

Field Documentation

Data Fields

Enumeration Type Documentation

Function Documentation