Overview

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

Data Structures
struct	qtmr_config_t
	Quad Timer config structure. More...

Enumerations
enum	qtmr_primary_count_source_t { kQTMR_ClockCounter0InputPin = 0, kQTMR_ClockCounter1InputPin, kQTMR_ClockCounter2InputPin, kQTMR_ClockCounter3InputPin, kQTMR_ClockCounter0Output, kQTMR_ClockCounter1Output, kQTMR_ClockCounter2Output, kQTMR_ClockCounter3Output, kQTMR_ClockDivide_1, kQTMR_ClockDivide_2, kQTMR_ClockDivide_4, kQTMR_ClockDivide_8, kQTMR_ClockDivide_16, kQTMR_ClockDivide_32, kQTMR_ClockDivide_64, kQTMR_ClockDivide_128 }
	Quad Timer primary clock source selection. More...

enum	qtmr_input_source_t { kQTMR_Counter0InputPin = 0, kQTMR_Counter1InputPin, kQTMR_Counter2InputPin, kQTMR_Counter3InputPin }
	Quad Timer input sources selection. More...

enum	qtmr_counting_mode_t { kQTMR_NoOperation = 0, kQTMR_PriSrcRiseEdge, kQTMR_PriSrcRiseAndFallEdge, kQTMR_PriSrcRiseEdgeSecInpHigh, kQTMR_QuadCountMode, kQTMR_PriSrcRiseEdgeSecDir, kQTMR_SecSrcTrigPriCnt, kQTMR_CascadeCount }
	Quad Timer counting mode selection. More...

enum	qtmr_output_mode_t { kQTMR_AssertWhenCountActive = 0, kQTMR_ClearOnCompare, kQTMR_SetOnCompare, kQTMR_ToggleOnCompare, kQTMR_ToggleOnAltCompareReg, kQTMR_SetOnCompareClearOnSecSrcInp, kQTMR_SetOnCompareClearOnCountRoll, kQTMR_EnableGateClock }
	Quad Timer output mode selection. More...

enum	qtmr_input_capture_edge_t { kQTMR_NoCapture = 0, kQTMR_RisingEdge, kQTMR_FallingEdge, kQTMR_RisingAndFallingEdge }
	Quad Timer input capture edge mode, rising edge, or falling edge. More...

enum	qtmr_preload_control_t { kQTMR_NoPreload = 0, kQTMR_LoadOnComp1, kQTMR_LoadOnComp2 }
	Quad Timer input capture edge mode, rising edge, or falling edge. More...

enum	qtmr_debug_action_t { kQTMR_RunNormalInDebug = 0U, kQTMR_HaltCounter, kQTMR_ForceOutToZero, kQTMR_HaltCountForceOutZero }
	List of Quad Timer run options when in Debug mode. More...

enum	qtmr_interrupt_enable_t { kQTMR_CompareInterruptEnable = (1U << 0), kQTMR_Compare1InterruptEnable = (1U << 1), kQTMR_Compare2InterruptEnable = (1U << 2), kQTMR_OverflowInterruptEnable = (1U << 3), kQTMR_EdgeInterruptEnable = (1U << 4) }
	List of Quad Timer interrupts. More...

enum	qtmr_status_flags_t { kQTMR_CompareFlag = (1U << 0), kQTMR_Compare1Flag = (1U << 1), kQTMR_Compare2Flag = (1U << 2), kQTMR_OverflowFlag = (1U << 3), kQTMR_EdgeFlag = (1U << 4) }
	List of Quad Timer flags. More...

enum	qtmr_channel_selection_t { kQTMR_Channel_0 = 0U, kQTMR_Channel_1, kQTMR_Channel_2, kQTMR_Channel_3 }
	List of channel selection. More...

enum	qtmr_dma_enable_t { kQTMR_InputEdgeFlagDmaEnable = (1U << 0), kQTMR_ComparatorPreload1DmaEnable = (1U << 1), kQTMR_ComparatorPreload2DmaEnable = (1U << 2) }
	List of Quad Timer DMA enable. More...

Functions
status_t	QTMR_SetupPwm (TMR_Type *base, qtmr_channel_selection_t channel, uint32_t pwmFreqHz, uint8_t dutyCyclePercent, bool outputPolarity, uint32_t srcClock_Hz)
	Sets up Quad timer module for PWM signal output. More...

void	QTMR_SetupInputCapture (TMR_Type *base, qtmr_channel_selection_t channel, qtmr_input_source_t capturePin, bool inputPolarity, bool reloadOnCapture, qtmr_input_capture_edge_t captureMode)
	Allows the user to count the source clock cycles until a capture event arrives. More...

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

Initialization and deinitialization
void	QTMR_Init (TMR_Type base, qtmr_channel_selection_t channel, const qtmr_config_t config)
	Ungates the Quad Timer clock and configures the peripheral for basic operation. More...

void	QTMR_Deinit (TMR_Type *base, qtmr_channel_selection_t channel)
	Stops the counter and gates the Quad Timer clock. More...

void	QTMR_GetDefaultConfig (qtmr_config_t *config)
	Fill in the Quad Timer config struct with the default settings. More...

Interrupt Interface
void	QTMR_EnableInterrupts (TMR_Type *base, qtmr_channel_selection_t channel, uint32_t mask)
	Enables the selected Quad Timer interrupts. More...

void	QTMR_DisableInterrupts (TMR_Type *base, qtmr_channel_selection_t channel, uint32_t mask)
	Disables the selected Quad Timer interrupts. More...

uint32_t	QTMR_GetEnabledInterrupts (TMR_Type *base, qtmr_channel_selection_t channel)
	Gets the enabled Quad Timer interrupts. More...

Status Interface
uint32_t	QTMR_GetStatus (TMR_Type *base, qtmr_channel_selection_t channel)
	Gets the Quad Timer status flags. More...

void	QTMR_ClearStatusFlags (TMR_Type *base, qtmr_channel_selection_t channel, uint32_t mask)
	Clears the Quad Timer status flags. More...

Read and Write the timer period
void	QTMR_SetTimerPeriod (TMR_Type *base, qtmr_channel_selection_t channel, uint16_t ticks)
	Sets the timer period in ticks. More...

static uint16_t	QTMR_GetCurrentTimerCount (TMR_Type *base, qtmr_channel_selection_t channel)
	Reads the current timer counting value. More...

Timer Start and Stop
static void	QTMR_StartTimer (TMR_Type *base, qtmr_channel_selection_t channel, qtmr_counting_mode_t clockSource)
	Starts the Quad Timer counter. More...

static void	QTMR_StopTimer (TMR_Type *base, qtmr_channel_selection_t channel)
	Stops the Quad Timer counter. More...

Enable and Disable the Quad Timer DMA
void	QTMR_EnableDma (TMR_Type *base, qtmr_channel_selection_t channel, uint32_t mask)
	Enable the Quad Timer DMA. More...

void	QTMR_DisableDma (TMR_Type *base, qtmr_channel_selection_t channel, uint32_t mask)
	Disable the Quad Timer DMA. More...

Data Structure Documentation

struct qtmr_config_t

This structure holds the configuration settings for the Quad Timer peripheral. To initialize this structure to reasonable defaults, call the QTMR_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
qtmr_primary_count_source_t	primarySource
	Specify the primary count source.

qtmr_input_source_t	secondarySource
	Specify the secondary count source.

bool	enableMasterMode
	true: Broadcast compare function output to other counters; false no broadcast

bool	enableExternalForce
	true: Compare from another counter force state of OFLAG signal false: OFLAG controlled by local counter

uint8_t	faultFilterCount
	Fault filter count.

uint8_t	faultFilterPeriod
	Fault filter period;value of 0 will bypass the filter.

qtmr_debug_action_t	debugMode
	Operation in Debug mode.

Enumeration Type Documentation

enum qtmr_primary_count_source_t

Enumerator
kQTMR_ClockCounter0InputPin	Use counter 0 input pin.
kQTMR_ClockCounter1InputPin	Use counter 1 input pin.
kQTMR_ClockCounter2InputPin	Use counter 2 input pin.
kQTMR_ClockCounter3InputPin	Use counter 3 input pin.
kQTMR_ClockCounter0Output	Use counter 0 output.
kQTMR_ClockCounter1Output	Use counter 1 output.
kQTMR_ClockCounter2Output	Use counter 2 output.
kQTMR_ClockCounter3Output	Use counter 3 output.
kQTMR_ClockDivide_1	IP bus clock divide by 1 prescaler.
kQTMR_ClockDivide_2	IP bus clock divide by 2 prescaler.
kQTMR_ClockDivide_4	IP bus clock divide by 4 prescaler.
kQTMR_ClockDivide_8	IP bus clock divide by 8 prescaler.
kQTMR_ClockDivide_16	IP bus clock divide by 16 prescaler.
kQTMR_ClockDivide_32	IP bus clock divide by 32 prescaler.
kQTMR_ClockDivide_64	IP bus clock divide by 64 prescaler.
kQTMR_ClockDivide_128	IP bus clock divide by 128 prescaler.

enum qtmr_input_source_t

Enumerator
kQTMR_Counter0InputPin	Use counter 0 input pin.
kQTMR_Counter1InputPin	Use counter 1 input pin.
kQTMR_Counter2InputPin	Use counter 2 input pin.
kQTMR_Counter3InputPin	Use counter 3 input pin.

enum qtmr_counting_mode_t

Enumerator
kQTMR_NoOperation	No operation.
kQTMR_PriSrcRiseEdge	Count rising edges or primary source.
kQTMR_PriSrcRiseAndFallEdge	Count rising and falling edges of primary source.
kQTMR_PriSrcRiseEdgeSecInpHigh	Count rise edges of pri SRC while sec inp high active.
kQTMR_QuadCountMode	Quadrature count mode, uses pri and sec sources.
kQTMR_PriSrcRiseEdgeSecDir	Count rising edges of pri SRC; sec SRC specifies dir.
kQTMR_SecSrcTrigPriCnt	Edge of sec SRC trigger primary count until compare.
kQTMR_CascadeCount	Cascaded count mode (up/down)

enum qtmr_output_mode_t

Enumerator
kQTMR_AssertWhenCountActive	Assert OFLAG while counter is active.
kQTMR_ClearOnCompare	Clear OFLAG on successful compare.
kQTMR_SetOnCompare	Set OFLAG on successful compare.
kQTMR_ToggleOnCompare	Toggle OFLAG on successful compare.
kQTMR_ToggleOnAltCompareReg	Toggle OFLAG using alternating compare registers.
kQTMR_SetOnCompareClearOnSecSrcInp	Set OFLAG on compare, clear on sec SRC input edge.
kQTMR_SetOnCompareClearOnCountRoll	Set OFLAG on compare, clear on counter rollover.
kQTMR_EnableGateClock	Enable gated clock output while count is active.

enum qtmr_input_capture_edge_t

Enumerator
kQTMR_NoCapture	Capture is disabled.
kQTMR_RisingEdge	Capture on rising edge (IPS=0) or falling edge (IPS=1)
kQTMR_FallingEdge	Capture on falling edge (IPS=0) or rising edge (IPS=1)
kQTMR_RisingAndFallingEdge	Capture on both edges.

enum qtmr_preload_control_t

Enumerator
kQTMR_NoPreload	Never preload.
kQTMR_LoadOnComp1	Load upon successful compare with value in COMP1.
kQTMR_LoadOnComp2	Load upon successful compare with value in COMP2.

enum qtmr_debug_action_t

Enumerator
kQTMR_RunNormalInDebug	Continue with normal operation.
kQTMR_HaltCounter	Halt counter.
kQTMR_ForceOutToZero	Force output to logic 0.
kQTMR_HaltCountForceOutZero	Halt counter and force output to logic 0.

enum qtmr_interrupt_enable_t

Enumerator
kQTMR_CompareInterruptEnable	Compare interrupt.
kQTMR_Compare1InterruptEnable	Compare 1 interrupt.
kQTMR_Compare2InterruptEnable	Compare 2 interrupt.
kQTMR_OverflowInterruptEnable	Timer overflow interrupt.
kQTMR_EdgeInterruptEnable	Input edge interrupt.

enum qtmr_status_flags_t

Enumerator
kQTMR_CompareFlag	Compare flag.
kQTMR_Compare1Flag	Compare 1 flag.
kQTMR_Compare2Flag	Compare 2 flag.
kQTMR_OverflowFlag	Timer overflow flag.
kQTMR_EdgeFlag	Input edge flag.

enum qtmr_channel_selection_t

Enumerator
kQTMR_Channel_0	TMR Channel 0.
kQTMR_Channel_1	TMR Channel 1.
kQTMR_Channel_2	TMR Channel 2.
kQTMR_Channel_3	TMR Channel 3.

enum qtmr_dma_enable_t

Enumerator
kQTMR_InputEdgeFlagDmaEnable	Input Edge Flag DMA Enable.
kQTMR_ComparatorPreload1DmaEnable	Comparator Preload Register 1 DMA Enable.
kQTMR_ComparatorPreload2DmaEnable	Comparator Preload Register 2 DMA Enable.

Function Documentation

void QTMR_Init	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		const qtmr_config_t *	config
	)

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

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
config	Pointer to user's Quad Timer config structure

void QTMR_Deinit	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number

void QTMR_GetDefaultConfig ( qtmr_config_t * config )

The default values are:

*    config->debugMode = kQTMR_RunNormalInDebug;
*    config->enableExternalForce = false;
*    config->enableMasterMode = false;
*    config->faultFilterCount = 0;
*    config->faultFilterPeriod = 0;
*    config->primarySource = kQTMR_ClockDivide_2;
*    config->secondarySource = kQTMR_Counter0InputPin;
* 

Parameters

config Pointer to user's Quad Timer config structure.

status_t QTMR_SetupPwm	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint32_t	pwmFreqHz,
		uint8_t	dutyCyclePercent,
		bool	outputPolarity,
		uint32_t	srcClock_Hz
	)

The function initializes the timer module according to the parameters passed in by the user. The function also sets up the value compare registers to match the PWM signal requirements.

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
pwmFreqHz	PWM signal frequency in Hz
dutyCyclePercent	PWM pulse width, value should be between 0 to 100 0=inactive signal(0% duty cycle)... 100=active signal (100% duty cycle)
outputPolarity	true: invert polarity of the output signal, false: no inversion
srcClock_Hz	Main counter clock in Hz.

Returns: Returns an error if there was error setting up the signal.

void QTMR_SetupInputCapture	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		qtmr_input_source_t	capturePin,
		bool	inputPolarity,
		bool	reloadOnCapture,
		qtmr_input_capture_edge_t	captureMode
	)

The count is stored in the capture register.

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
capturePin	Pin through which we receive the input signal to trigger the capture
inputPolarity	true: invert polarity of the input signal, false: no inversion
reloadOnCapture	true: reload the counter when an input capture occurs, false: no reload
captureMode	Specifies which edge of the input signal triggers a capture

void QTMR_EnableInterrupts	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint32_t	mask
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
mask	The interrupts to enable. This is a logical OR of members of the enumeration qtmr_interrupt_enable_t

void QTMR_DisableInterrupts	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint32_t	mask
	)

Parameters

base	Quad Timer peripheral base addres
channel	Quad Timer channel number
mask	The interrupts to enable. This is a logical OR of members of the enumeration qtmr_interrupt_enable_t

uint32_t QTMR_GetEnabledInterrupts	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number

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

uint32_t QTMR_GetStatus	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number

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

void QTMR_ClearStatusFlags	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint32_t	mask
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
mask	The status flags to clear. This is a logical OR of members of the enumeration qtmr_status_flags_t

void QTMR_SetTimerPeriod	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint16_t	ticks
	)

Timers counts from initial value till it equals the count value set here. The counter will then reinitialize to the value specified in the Load register.

Note

This function will write the time period in ticks to COMP1 or COMP2 register depending on the count direction
User can call the utility macros provided in fsl_common.h to convert to ticks
This function supports cases, providing only primary source clock without secondary source clock.

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
ticks	Timer period in units of ticks

static uint16_t QTMR_GetCurrentTimerCount	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel
	)

inlinestatic

This function returns the real-time timer counting value, in a range from 0 to a timer period.

Note: User can call the utility macros provided in fsl_common.h to convert ticks to usec or msec

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number

Returns: Current counter value in ticks

static void QTMR_StartTimer	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		qtmr_counting_mode_t	clockSource
	)

inlinestatic

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
clockSource	Quad Timer clock source

static void QTMR_StopTimer	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel
	)

inlinestatic

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number

void QTMR_EnableDma	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint32_t	mask
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
mask	The DMA to enable. This is a logical OR of members of the enumeration qtmr_dma_enable_t

void QTMR_DisableDma	(	TMR_Type *	base,
		qtmr_channel_selection_t	channel,
		uint32_t	mask
	)

Parameters

base	Quad Timer peripheral base address
channel	Quad Timer channel number
mask	The DMA to enable. This is a logical OR of members of the enumeration qtmr_dma_enable_t

Overview

Data Structures

Enumerations

Functions

Driver version

Initialization and deinitialization

Interrupt Interface

Status Interface

Read and Write the timer period

Timer Start and Stop

Enable and Disable the Quad Timer DMA

Data Structure Documentation

Data Fields

Enumeration Type Documentation

Function Documentation