Read Guidance

This document consists of sections titled with Driver Overview, Data Structures, Enumerations, Functions, etc., each with an overview list and detailed documentation. It is recommended to read the Driver Overview first for it includes a comprehensive description of the peripheral, driver and driver changes. Other sections give detailed information for APIs, enums, macros, etc., for your further reference.

Driver Overview
	CMP Peripheral and Driver Overview
	Content including 1) peripheral features, work logic and work method; 2) driver design logic and use method; 3) typical use case.

	The Driver Change Log
	The current cmp driver version is 2.0.0.

Data Structures
struct	cmp_dac_config_t
	CMP internal DAC configuration structure. More...

union	cmp_dma_interrupt_config_t
	CMP dma/interrupt configure union. More...

struct	cmp_config_t
	CMP configuration structure. More...

Enumerations
enum	cmp_interrupt_request_t { kCMP_InterruptRequestDisabled = 0U, kCMP_InterruptRequestEnableOutputRisingEdge, kCMP_InterruptRequestEnableOutputFallingEdge, kCMP_InterrruptRequestEnableAll }
	CMP Interrupt request type definition. More...

enum	cmp_dma_request_t { kCMP_DMARequestDisabled = 0U, kCMP_DMARequestEnableOutputRisingEdge, kCMP_DMARequestEnableOutputFallingEdge, kCMP_DMARequestEnableAll }
	CMP DMA request type definition. More...

enum	cmp_output_flag_t { kCMP_OutputFlagRisingEdge = CMP_SCR_CFR_MASK, kCMP_OutputFlagFallingEdge = CMP_SCR_CFF_MASK, kCMP_OutputFlagBothEdge }
	CMP output flags' mask. More...

enum	cmp_hysteresis_level_t { kCMP_HysteresisLevel0 = 0U, kCMP_HysteresisLevel1 = 1U, kCMP_HysteresisLevel2 = 2U, kCMP_HysteresisLevel3 = 3U }
	CMP Hysteresis level. More...

enum	cmp_comparasion_speed_mode_t { kCMP_ComparsionModeLowSpeed = 0U, kCMP_ComparsionModeHighSpeed = 1U }
	CMP compassion speed mode enumerator. More...

enum	cmp_dac_vref_source_t { kCMP_DACVrefSourceVin1 = 0U, kCMP_DACVrefSourceVin2 = 1U }
	CMP DAC Voltage Reference source. More...

enum	cmp_window_output_mode_t { kCMP_WindowOuputLastLatchedValue, kCMP_WindowOutputZeroValue = 1U }
	CMP output value of window. More...

enum	cmp_filter_count_t { kCMP_FilterCountDisable = 0U, kCMP_FilterCount1 = 1U, kCMP_FilterCount2 = 2U, kCMP_FilterCount3 = 3U, kCMP_FilterCount4 = 4U, kCMP_FilterCount5 = 5U, kCMP_FilterCount6 = 6U, kCMP_FilterCount7 = 7U }
	CMP filter count. More...

enum	cmp_external_sample_count_t { kCMP_ExternalSampleCount1 = 1U, kCMP_ExternalSampleCount2 = 2U, kCMP_ExternalSampleCount3 = 3U, kCMP_ExternalSampleCount4 = 4U, kCMP_ExternalSampleCount5 = 5U, kCMP_ExternalSampleCount6 = 6U, kCMP_ExternalSampleCount7 = 7U }
	CMP external sample count. More...

enum	cmp_output_source_t { kCMP_OutputSourceFromFilterCOUT = 0U, kCMP_OutputSourceFromUnfilteredCOUTA = 1U }
	CMP output source enumerator. More...

enum	cmp_work_mode_t { kCMP_WorkModeWindowBypassAndNoExternalSample = 0U, kCMP_WorkModeWindowBypassAndExternalSample = 1U, kCMP_WorkModeWindowEnabledAndNoExternalSample = 2U }
	CMP work mode definition. More...

Driver version
#define	FSL_CMP_DRIVER_VERSION (MAKE_VERSION(2, 0, 0))
	CMP driver version 2.0.0. More...

CMP Initialization and de-initialization interfaces
void	CMP_GetDefaultConfig (cmp_config_t *psConfig)
	Initializes the CMP user configuration structure. More...

void	CMP_Init (CMP_Type base, const cmp_config_t psConfig)
	Initializes the CMP. More...

void	CMP_Deinit (CMP_Type *base)
	De-initializes the CMP module. More...

CMP functional interfaces
static void	CMP_Enable (CMP_Type *base, bool bEnable)
	Enables/disables the CMP module. More...

static void	CMP_SetInputChannel (CMP_Type *base, cmp_input_mux_t ePlusChannel, cmp_input_mux_t eMinusChannel)
	Sets the input channels for the comparator. More...

static void	CMP_SelectOutputSource (CMP_Type *base, cmp_output_source_t eOutputSource)
	Select comparator output source. More...

static void	CMP_EnableOuputPin (CMP_Type *base, bool bEnable)
	Enable/Disable Comparator output pin. More...

static uint8_t	CMP_GetComparatorOutput (CMP_Type *base)
	Get Comparator output. More...

static void	CMP_SetHysteresisLevel (CMP_Type *base, cmp_hysteresis_level_t eHysteresisLevel)
	Sets hysteresis level. More...

static void	CMP_SetComparasionSpeedMode (CMP_Type *base, cmp_comparasion_speed_mode_t eComparatorSpeedMode)
	Sets comparison speed mode. More...

static void	CMP_EnableInvertOutput (CMP_Type *base, bool bEnable)
	Enable/Disable comparator invert feature. More...

static void	CMP_EnableWindow (CMP_Type *base, bool bEnable)
	Enable the window function. More...

static void	CMP_SetWindowOutputMode (CMP_Type *base, cmp_window_output_mode_t eWindowOutputMode)
	Set the window output mode. More...

static void	CMP_EnableExternalSampleMode (CMP_Type *base, bool bEnable)
	Enable/Disable external Sample mode. More...

static void	CMP_SetExternalSampleCount (CMP_Type *base, cmp_external_sample_count_t eSampleCount)
	Sets external sample count. More...

static void	CMP_SetInternalFilterCount (CMP_Type *base, cmp_filter_count_t eFilterCount)
	Sets internal filter count. More...

static void	CMP_SetInternalFilterPeriod (CMP_Type *base, uint8_t u8FilterPeriod)
	Sets the internal filter period. More...

void	CMP_SetDACConfig (CMP_Type base, const cmp_dac_config_t psConfig)
	Configures the internal DAC. More...

static void	CMP_SetDACOutputVoltage (CMP_Type *base, uint8_t u8OutputVoltageDivider)
	Sets DAC output voltage. More...

static void	CMP_EnableInternalDAC (CMP_Type *base, bool bEnable)
	Enable/Disable internal DAC. More...

static void	CMP_SetDACReferenceVoltageSource (CMP_Type *base, cmp_dac_vref_source_t eDACVrefSource)
	Sets internal DAC's reference voltage source. More...

CMP interrupt interfaces
static void	CMP_EnableInterrupt (CMP_Type *base, cmp_interrupt_request_t eInterruptRequest)
	Interrupt request to enable. More...

CMP status interfaces
static cmp_output_flag_t	CMP_GetStatusFlags (CMP_Type *base)
	Gets the status flags. More...

static void	CMP_ClearStatusFlags (CMP_Type *base, cmp_output_flag_t eOutputFlag)
	Clears the status flags. More...

CMP DMA interfaces
static void	CMP_EnableDMA (CMP_Type *base, cmp_dma_request_t eDMARequestType)
	Enables CMP DMA request. More...

static void *	CMP_GetComparatorResultRegisterAddress (CMP_Type *base)
	Get CMP result register address for DMA access. More...

Data Structure Documentation

struct cmp_dac_config_t

Data Fields
cmp_dac_vref_source_t	eDACVrefSource
	DAC reference voltage source. More...

uint8_t	u8DACOutputVoltageDivider
	divider Value for the DAC Output Voltage, DAC output voltage = (VREF / 256) * (u8DACOutputVoltageDivider + 1). More...

bool	bEnableInternalDAC
	flag to control if the internal DAC need to be enabled

Field Documentation

cmp_dac_vref_source_t cmp_dac_config_t::eDACVrefSource

uint8_t cmp_dac_config_t::u8DACOutputVoltageDivider

union cmp_dma_interrupt_config_t

Note: , the interrupt request and dma request cannot be used at the same time, that is to say When DMA support is enabled by setting SCR[DMAEN] and the interrupt is enabled by setting SCR[IER], SCR[IEF], or both, the corresponding change on COUT forces a DMA transfer request rather than a CPU interrupt instead

Data Fields
cmp_dma_request_t	eDMARequest
	dma request type

cmp_interrupt_request_t	eInterruptRequest
	interrupt request type

struct cmp_config_t

Data Fields
cmp_hysteresis_level_t	eHysteresisLevel
	CMP hysteresis leveL.

cmp_comparasion_speed_mode_t	eComparasionSpeedMode
	CMP comparison speed mode.

cmp_work_mode_t	eWorkMode
	CMP work mode.

cmp_input_mux_t	ePlusInput
	CMP plus input mux, the definition of this enum is in soc header file.

cmp_input_mux_t	eMinusInput
	CMP minus input mux, the definition of this enum is in soc header file.

cmp_dac_config_t	sDacConfig
	CMP internal DAC configuration structure cmp_dac_config_t.

bool	bInvertComparatorOutputPolarity
	Inverted comparator output polarity. More...

cmp_window_output_mode_t	eWindowOutputMode
	only works when cmp work mode is kCMP_WorkModeWindowEnabledAndNoExternalSample

cmp_filter_count_t	eFilterCount
	Filter Count.Available range is 0-7, 0 is disable internal filter can be used in internal sampling mode only. More...

uint8_t	u8FilterPeriod
	Filter Period. More...

cmp_external_sample_count_t	eExternalSampleCount
	Available range is 1 - 7, used in external sampling mode only.

cmp_output_source_t	eOutputSource
	cmp output source

bool	bEnableOutputPin
	the comparator output(CMPO) is driven out on the associated CMPO output pin

cmp_dma_interrupt_config_t	uDmaInterruptConfig
	CMP interrupt/dma configuration.

bool	bCMPEnable
	flag to control if CMP module start immediately when the configuration is done

Field Documentation

bool cmp_config_t::bInvertComparatorOutputPolarity

cmp_filter_count_t cmp_config_t::eFilterCount

uint8_t cmp_config_t::u8FilterPeriod

The divider to the bus clock. Available range is 0-255, can be used in internal sampling mode. When the filter clock from internal divided bus clock, setting the sample period to 0 will disable the filter

Macro Definition Documentation

#define FSL_CMP_DRIVER_VERSION (MAKE_VERSION(2, 0, 0))

Enumeration Type Documentation

enum cmp_interrupt_request_t

Enumerator
kCMP_InterruptRequestDisabled	interrupt disabled
kCMP_InterruptRequestEnableOutputRisingEdge	Comparator interrupt request enable rising edge.
kCMP_InterruptRequestEnableOutputFallingEdge	Comparator interrupt request enable falling edge.
kCMP_InterrruptRequestEnableAll	comparator interrupt request enable on rising edge or falling edge

enum cmp_dma_request_t

Enumerator
kCMP_DMARequestDisabled	DMA disabled.
kCMP_DMARequestEnableOutputRisingEdge	Comparator dma request enable on rising edge.
kCMP_DMARequestEnableOutputFallingEdge	Comparator dnma request enable on falling edge.
kCMP_DMARequestEnableAll	comparator dma request enable on rising edge or falling edge

enum cmp_output_flag_t

Enumerator
kCMP_OutputFlagRisingEdge	Rising-edge on the comparison output has occurred.
kCMP_OutputFlagFallingEdge	Falling-edge on the comparison output has occurred.
kCMP_OutputFlagBothEdge	Rising-edge and Falling-edge on the comparison output has occurred.

enum cmp_hysteresis_level_t

Enumerator
kCMP_HysteresisLevel0	Hysteresis level 0.
kCMP_HysteresisLevel1	Hysteresis level 1.
kCMP_HysteresisLevel2	Hysteresis level 2.
kCMP_HysteresisLevel3	Hysteresis level 3.

enum cmp_comparasion_speed_mode_t

Enumerator
kCMP_ComparsionModeLowSpeed	Low-Speed Comparison mode has lower current consumption.
kCMP_ComparsionModeHighSpeed	High-Speed Comparison mode has higher current consumption.

enum cmp_dac_vref_source_t

Enumerator
kCMP_DACVrefSourceVin1	Vin1 is selected as a resistor ladder network supply reference Vin.
kCMP_DACVrefSourceVin2	Vin2 is selected as a resistor ladder network supply reference Vin.

enum cmp_window_output_mode_t

Enumerator
kCMP_WindowOuputLastLatchedValue	When WINDOW signal changes from 1 to 0, COUTA output holds the last latched value before WINDOW signal falls to 0.
kCMP_WindowOutputZeroValue	When WINDOW signal changes from 1 to 0, COUTA output is forced to 0.

enum cmp_filter_count_t

Enumerator
kCMP_FilterCountDisable	filter is disabled
kCMP_FilterCount1	1 sample must agrees, the comparator output is simply sampled
kCMP_FilterCount2	2 consecutive samples must agrees
kCMP_FilterCount3	3 consecutive samples must agrees
kCMP_FilterCount4	4 consecutive samples must agrees
kCMP_FilterCount5	5 consecutive samples must agrees
kCMP_FilterCount6	6 consecutive samples must agrees
kCMP_FilterCount7	7 consecutive samples must agrees

enum cmp_external_sample_count_t

Enumerator
kCMP_ExternalSampleCount1	1 sample must agrees, the comparator output is simply sampled
kCMP_ExternalSampleCount2	2 consecutive samples must agrees
kCMP_ExternalSampleCount3	3 consecutive samples must agrees
kCMP_ExternalSampleCount4	4 consecutive samples must agrees
kCMP_ExternalSampleCount5	5 consecutive samples must agrees
kCMP_ExternalSampleCount6	6 consecutive samples must agrees
kCMP_ExternalSampleCount7	7 consecutive samples must agrees

enum cmp_output_source_t

Enumerator
kCMP_OutputSourceFromFilterCOUT	Set the filtered comparator output to equal COUT.
kCMP_OutputSourceFromUnfilteredCOUTA	Set the unfiltered comparator output to equal COUTA.

enum cmp_work_mode_t

Enumerator
kCMP_WorkModeWindowBypassAndNoExternalSample	window block bypassed, external sampling mode disabled
kCMP_WorkModeWindowBypassAndExternalSample	window block bypassed, external SAMPLE mode enable
kCMP_WorkModeWindowEnabledAndNoExternalSample	window block enabled, external sampling mode disabled

Function Documentation

void CMP_GetDefaultConfig ( cmp_config_t * psConfig )

This function initializes the user configuration structure to the default values. It is corresponding to the continuous mode configurations.

Parameters

psConfig pointer of cmp_config_t.

void CMP_Init	(	CMP_Type *	base,
		const cmp_config_t *	psConfig
	)

This function initializes the CMP module. The operations included are as follows.

Enable the clock for CMP module.
Configure the comparator according to the CMP configuration structure.

Parameters

base	CMP peripheral base address.
psConfig	Pointer to the configuration structure.

void CMP_Deinit ( CMP_Type * base )

This function de-initializes the CMP module. The operations included are as follows.

Disabling the CMP module.
Disabling the clock for CMP module.

Parameters

base	CMP peripheral base address.

static void CMP_Enable	(	CMP_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	CMP peripheral base address.
enable	Enables or disables the module.

static void CMP_SetInputChannel	(	CMP_Type *	base,
		cmp_input_mux_t	ePlusChannel,
		cmp_input_mux_t	eMinusChannel
	)

inlinestatic

This function sets the input channels for the comparator. Note that two input channels cannot be set the same way in the application. When the user selects the same input from the analog mux to the positive and negative port, the comparator is disabled automatically.

Parameters

base	CMP peripheral base address.
ePlusChannel	Plus side input channel number, cmp_input_mux_t.
eMinusChannel	Minus side input channel number, cmp_input_mux_t.

static void CMP_SelectOutputSource	(	CMP_Type *	base,
		cmp_output_source_t	eOutputSource
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eOutputSource	The output signal to be set, please reference cmp_output_source_t for details.

static void CMP_EnableOuputPin	(	CMP_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	CMP peripheral base address.
bEnable	Enable/Disable comparator output pin. true – CMPO is available on the associate CMPO output pin. false – CMPO is not available on the associate CMPO output pin.

static uint8_t CMP_GetComparatorOutput ( CMP_Type * base )

inlinestatic

Parameters

base	CMP peripheral base address.

Return values

current analog comparator output 0 or 1

static void CMP_SetHysteresisLevel	(	CMP_Type *	base,
		cmp_hysteresis_level_t	eHysteresisLevel
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eHysteresisLevel	The programmable hysteresis level to be set, please refer to cmp_hysteresis_level_t for details.

static void CMP_SetComparasionSpeedMode	(	CMP_Type *	base,
		cmp_comparasion_speed_mode_t	eComparatorSpeedMode
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eComparatorSpeedMode	The comparison speed mode, please reference cmp_comparasion_speed_mode_t for details.

static void CMP_EnableInvertOutput	(	CMP_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	CMP peripheral base address.
bEnable	Enable/Disable comparator invert feature. true – Inverts the comparator output. false – Does not invert the comparator output.

static void CMP_EnableWindow	(	CMP_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	CMP peripheral base address.
bEnable	true is enable, false is disable.

static void CMP_SetWindowOutputMode	(	CMP_Type *	base,
		cmp_window_output_mode_t	eWindowOutputMode
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eWindowOutputMode	cmp_window_output_mode_t.

static void CMP_EnableExternalSampleMode	(	CMP_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	CMP peripheral base address.
bEnable	true is using external sample mode, false is using interface sample mode.

static void CMP_SetExternalSampleCount	(	CMP_Type *	base,
		cmp_external_sample_count_t	eSampleCount
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eSampleCount	The number of consecutive samples that must agree prior to the comparator output filter accepting a new output state, cmp_external_sample_count_t.

static void CMP_SetInternalFilterCount	(	CMP_Type *	base,
		cmp_filter_count_t	eFilterCount
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eFilterCount	The number of consecutive samples that must agree prior to the comparator output filter accepting a new output state, cmp_filter_count_t.

static void CMP_SetInternalFilterPeriod	(	CMP_Type *	base,
		uint8_t	u8FilterPeriod
	)

inlinestatic

It is used as the divider to bus clock.

Parameters

base	CMP peripheral base address.
u8FilterPeriod	Filter Period. The divider to the bus clock. Available range is 0-255.

void CMP_SetDACConfig	(	CMP_Type *	base,
		const cmp_dac_config_t *	psConfig
	)

Parameters

base	CMP peripheral base address.
psConfig	Pointer to the configuration structure.

static void CMP_SetDACOutputVoltage	(	CMP_Type *	base,
		uint8_t	u8OutputVoltageDivider
	)

inlinestatic

Parameters

base	CMP peripheral base address.
u8OutputVoltageDivider	The digital value which is related to the desired DAC output voltage,

static void CMP_EnableInternalDAC	(	CMP_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	CMP peripheral base address.
bEnable	Enable/Disable internal DAC. true – Enable internal DAC. false – Disable internal DAC.

static void CMP_SetDACReferenceVoltageSource	(	CMP_Type *	base,
		cmp_dac_vref_source_t	eDACVrefSource
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eDACVrefSource	reference voltage source, please cmp_dac_vref_source_t

static void CMP_EnableInterrupt	(	CMP_Type *	base,
		cmp_interrupt_request_t	eInterruptRequest
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eInterruptRequest	Mask value for interrupts. See cmp_interrupt_request_t.

static cmp_output_flag_t CMP_GetStatusFlags ( CMP_Type * base )

inlinestatic

Parameters

base	CMP peripheral base address.

Return values

Mask	value for the asserted flags. cmp_output_flag_t.

static void CMP_ClearStatusFlags	(	CMP_Type *	base,
		cmp_output_flag_t	eOutputFlag
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eOutputFlag	Mask value for the output flags, cmp_output_flag_t

static void CMP_EnableDMA	(	CMP_Type *	base,
		cmp_dma_request_t	eDMARequestType
	)

inlinestatic

Parameters

base	CMP peripheral base address.
eDMARequestType	cmp_dma_request_t

static void* CMP_GetComparatorResultRegisterAddress ( CMP_Type * base )

inlinestatic

Parameters

base	CMP peripheral base address.

Read Guidance

Driver Overview

Data Structures

Enumerations

Driver version

CMP Initialization and de-initialization interfaces

CMP functional interfaces

CMP interrupt interfaces

CMP status interfaces

CMP DMA interfaces

Data Structure Documentation

Data Fields

Field Documentation

Data Fields

Data Fields

Field Documentation

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation