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
	DAC 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 DAC driver version is 2.0.0.

Data Structures
struct	dac_normal_mode_config_t
	The structure of configuration when the operation mode is selected are normal operation mode. More...

struct	dac_automatic_mode_config_t
	The structure of configuration when the operation mode is selected as automatic operation mode. More...

union	dac_operation_config_u
	The union of operation modes' configuration. More...

struct	dac_config_t
	The structure for configuring the DAC. More...

Enumerations
enum	_dac_fifo_status_flags { kDAC_FIFOFullStatusFlag = DAC_STATUS_FULL_MASK, kDAC_FIFOEmptyStatusFlag = DAC_STATUS_EMPTY_MASK }
	The enumeration of DAC status flags, including FIFO full status flag and FIFO empty status flag. More...

enum	dac_operation_mode_t { kDAC_NormalOperationMode = 0U, kDAC_AutomaticOperationMode = 1U }
	The enumeration of DAC operation mode, including normal operation mode and automatic operation mode. More...

enum	dac_sync_signal_selection_t { kDAC_InternalClockSignal = 0U, kDAC_ExternalSyncInSignal = 1U }
	The enumeration of DAC sync signal mode, including internal clock signal and external SYNC_IN signal. More...

enum	dac_waveform_type_t { kDAC_RepeatSawtoothWaveform0 = 0U, kDAC_RepeatSawtoothWaveform1 = 1U, kDAC_RepeatTriangleWaveform0 = 2U, kDAC_RepeatTriangleWaveform1 = 3U, kDAC_OneShotSawtoothWaveform0 = 4U, kDAC_OneShotSawtoothWaveform1 = 5U }
	The enumeration of waveform type, such as square waveform, triangle waveform, etc. More...

enum	dac_sync_input_edge_t { kDAC_NoActiveEdge = 0U, kDAC_FallingEdge = 1U, kDAC_RisingEdge = 2U, kDAC_BothEdges = 3U }
	The enumeration of sync input edge that used for updates buffered registers, such as Falling edge, etc. More...

enum	dac_speed_mode_t { kDAC_HighSpeedMode = 0U, kDAC_LowSpeedMode = 1U }
	The enumeration of DAC speed mode, including high speed mode and low speed mode. More...

enum	dac_watermark_level_t { kDAC_WatermarkValue0 = 0U, kDAC_WatermarkValue2 = 1U, kDAC_WatermarkValue4 = 2U, kDAC_WatermarkValue6 = 3U }
	The enumeration of FIFO watermark level. More...

enum	dac_data_format_t { kDAC_DataWordRightJustified = 0U, kDAC_DataWordLeftJustified = 1U }
	The enumeration of DAC data format, inclding right right-justified and left-justified. More...

Driver version
#define	FSL_DAC_DRIVER_VERSION (MAKE_VERSION(2, 0, 0))
	DAC driver version. More...

Initialization And De-initialization Interfaces
void	DAC_Init (DAC_Type base, const dac_config_t psConfig)
	Initializes the DAC resource, including data format, sync signal, operation mode, etc. More...

void	DAC_Deinit (DAC_Type *base)
	De-initializes the DAC resource, the clock and power will be gated off. More...

void	DAC_GetDefaultConfig (dac_config_t *psConfig)
	Gets the default DAC configs, such as operation mode, watermark level, sync signal, etc. More...

Conversion Modes Related Interfaces
static void	DAC_SetSyncEdge (DAC_Type *base, dac_sync_input_edge_t eSyncEdge)
	Selects which SYNC input edge is used for updates, available selections are "no active edge", "falling edge", "rising edge", "both edge". More...

static void	DAC_SetLDOK (DAC_Type *base)
	Updates the buffered value of stepSize, minValue ,and maxValue at the active edge of the SYNC_IN signal. More...

static bool	DAC_GetLDOKValue (DAC_Type *base)
	Gets the value of load Okay bit field. More...

Operation Modes Related Interfaces
static void	DAC_EnableOneShot (DAC_Type *base, bool bEnable)
	Enables/Disables Oneshot feature, oneshot feature used to determines whether automatic waveform generation creates one waveform or a repeated waveform within the period defined by the active SYNC edges. More...

static void	DAC_WriteDataFIFO (DAC_Type *base, uint16_t u16Data)
	Writes DAC buffered data value based on the data format when the DAC is in normal operation mode. More...

static void	DAC_WriteStepSize (DAC_Type *base, uint16_t u16StepSize)
	Writes Step size based on the data format when the DAC is in automatic operation mode. More...

static void	DAC_WriteMinValue (DAC_Type *base, uint16_t u16MinValue)
	Writes the minium value based on the data format when the DAC is in automatic operation mode. More...

static void	DAC_WriteMaxValue (DAC_Type *base, uint16_t u16MaxValue)
	Writes the maximum value based on the data format when the DAC is in automatic operation mode. More...

static void	DAC_ConfigRefreshFrequency (DAC_Type *base, uint16_t u16CompareValue)
	Sets refresh frequency that used to decide when the automatically generated waveform value is updated. More...

DMA Control Related Interfaces
static void	DAC_EnableDMA (DAC_Type *base, bool bEnable)
	Enables/Disables DMA request that to be generated when the FIFO is below the watermark level. More...

static void	DAC_SetWatermarkLevel (DAC_Type *base, dac_watermark_level_t eWatermarkLevel)
	Sets watermark level which is used for asserting a DMA request. More...

Glitch Filter Related Interfaces
static void	DAC_EnableGlitchFilter (DAC_Type *base, bool bEnable)
	Enables/Disables Glitch filter. More...

static void	DAC_SetGlitchFilterCount (DAC_Type *base, uint8_t u8FilterCount)
	Sets glitch filter count value(ranges from 0 to 63) that represents the number of clock cycles for which the DAC output is held unchanged after new data is presented to the analog DAC's inputs. More...

Power And Speed Related Interface
static void	DAC_SetSpeedMode (DAC_Type *base, dac_speed_mode_t eSpeedMode)
	Selects speed mode, high speed mode uses more power and low speed mode saves power. More...

static void	DAC_EnableAnalogPortion (DAC_Type *base, bool bEnable)
	Enables/Disables the operation of the analog portion of the DAC. More...

Status Flags Interface
static uint16_t	DAC_GetFIFOStatusFlags (DAC_Type *base)
	Gets the fifo status flag of selected DAC instance. More...

Data Structure Documentation

struct dac_normal_mode_config_t

Data Fields
bool	bEnableDMA
	Enable/Disable DMA support. More...

uint16_t	u16DataFIFO
	The FIFO watermark level, if the level of FIFO is less than or equal to the watermark level field, a DMA request should be sent. More...

Field Documentation

bool dac_normal_mode_config_t::bEnableDMA

true Enable DMA support.
false Disable DMA support.

uint16_t dac_normal_mode_config_t::u16DataFIFO

The DAC data to be converted to analog. If the data format is set as kDAC_DataWordRightJustified then u16DataFIFO should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16DataFIFO should range from 16 to 65520, which means the lower 4 bits is useless.

struct dac_automatic_mode_config_t

Data Fields
dac_waveform_type_t	eWaveformType
	The type of waveform to be generated. More...

uint16_t	u16MinValue
	The step size to be added to or subtracted from the current value. More...

uint16_t	u16MaxValue
	The maximum value is the upper range limit during automatic waveform generation. More...

uint16_t	u16StartValue
	The start value of the wavefrom, should larger than the minium value and smaller than the maximum value. More...

uint16_t	u16CompareValue
	The compare value that used to decide the frequency of REFRESH signal. More...

Field Documentation

dac_waveform_type_t dac_automatic_mode_config_t::eWaveformType

uint16_t dac_automatic_mode_config_t::u16MinValue

If the data format is set as kDAC_DataWordRightJustified then u16StepSize should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16StepSize should range from 16 to 65520, which means the lower 4 bits is useless. The minimum value is the lower range limit during automatic waveform generation. If the data format is set as kDAC_DataWordRightJustified then u16MinValue should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16MinValue should range from 16 to 65520, which means the lower 4 bits is useless.

uint16_t dac_automatic_mode_config_t::u16MaxValue

If the data format is set as kDAC_DataWordRightJustified then u16MaxValue should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16MaxValue should range from 16 to 65520, which means the lower 4 bits is useless.

uint16_t dac_automatic_mode_config_t::u16StartValue

uint16_t dac_automatic_mode_config_t::u16CompareValue

The available range is 0 ~ 65535.

u16CompareValue=0 The REFRESH signal's frequency is equal to the clock's frequency so that the generated waveform will be updated every clock cycle.
u16CompareValue=N(N!=0) The REFRESH signal's frequency is equal to clock's frequency divided N+1 so that the generated waveform will be updated every N+1 clock cycles

union dac_operation_config_u

Data Fields
dac_normal_mode_config_t	sNormalModeConfig
	The configuration of normal operation mode， such as buffered data, watermark level, etc. More...

dac_automatic_mode_config_t	sAutomaticModeConfig
	The configuration of automatic operation mode, such as step size, minimum value, maximum value, etc. More...

Field Documentation

dac_normal_mode_config_t dac_operation_config_u::sNormalModeConfig

dac_automatic_mode_config_t dac_operation_config_u::sAutomaticModeConfig

struct dac_config_t

This structure is used to config the DAC module, to initialize the DAC module, user must set the member of this structure. This structure will cost 20 Byte memory space.

Data Fields
dac_sync_input_edge_t	eSyncInputEdge
	The SYNC input edge used to update buffered registers. More...

dac_operation_config_u	uOperationConfig
	The configuration of operation mode. More...

bool	bEnableGlitchFilter
	Enable/Disable glitch suppression filter. More...

uint8_t	u8GlitchFilterCount
	The count(ranges from 0 to 63) represents the number of clock cycles for which the DAC output is held unchanged after new data is presented to the analog DAC's inputs. More...

bool	bEnableAnalogPortion
	Power up/down the analog portion. More...

Field Documentation

dac_sync_input_edge_t dac_config_t::eSyncInputEdge

The buffered value will be updated at the selected active edge of SYNC_IN signal.

dac_operation_config_u dac_config_t::uOperationConfig

bool dac_config_t::bEnableGlitchFilter

true Enable glitch filter.
false Disable glitch filter.

uint8_t dac_config_t::u8GlitchFilterCount

bool dac_config_t::bEnableAnalogPortion

true Power up the analog portion of the DAC, and the DAC will output the value currently presented to its inputs.
false Power down the analog portion of the DAC, and its output will be pulled down.

Macro Definition Documentation

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

Enumeration Type Documentation

enum _dac_fifo_status_flags

Enumerator
kDAC_FIFOFullStatusFlag	Indicate the FIFO is full.
kDAC_FIFOEmptyStatusFlag	Indicate the FIFO is empty.

enum dac_operation_mode_t

Enumerator
kDAC_NormalOperationMode	Normal Mode to generate an analog representation of digital words.
kDAC_AutomaticOperationMode	Automatic Mode to generate waveform without requiring CPU or core assistance.

enum dac_sync_signal_selection_t

Enumerator
kDAC_InternalClockSignal	Internal Clock signal is selected as SYNC signal, data written to the buffered registers is used on the next clock cycle.
kDAC_ExternalSyncInSignal	Peripheral external signal is selected as SYNC signal, the update occurs on the active edge of SYNC_IN signal.

enum dac_waveform_type_t

Enumerator
kDAC_RepeatSawtoothWaveform0	DAC generates repeated sawtooth waveform0. The automatic waveform generation logic will create a repeated sawtooth waveform0 upon receiving an active SYNC edge, and the waveform repeats when it reaches its minimum and maximum value. The waveform increases from starting value to max value firstly. Like this following shown: /\| /\| /\| /\| / \| / \| / \| / \| \| / \| / \| / \| \|/ \|/ \|/ \|
kDAC_RepeatSawtoothWaveform1	DAC generates sawtooth waveform1. The automatic waveform generation logic will create a repeated sawtooth waveform1 upon receiving an active SYNC edge, and the waveform repeats when it reaches its minimum and maximum value. The waveform decreases from starting value to min value firstly. Like this following shown: \|\ \|\ \|\ \|\ \| \ \| \ \| \ \| \ \ \| \ \| \ \| \ \| \ \\| \\| \\| \\| \
kDAC_RepeatTriangleWaveform0	The automatic waveform generation logic will create a repeated sawtooth waveform1 upon receiving an active SYNC edge, and the waveform repeats when it reaches its minimum and maximum value. In this type the generated triangle waveform rises from the starting value. Like this following shown: /\ /\ /\ / \ / \ / \ / / \ / \ / \ / \/ \/ \/
kDAC_RepeatTriangleWaveform1	The automatic waveform generation logic will create a repeated sawtooth waveform1 upon receiving an active SYNC edge, and the waveform repeats when it reaches its minimum and maximum value. In this type the generated triangle waveform drops from the starting value. Like this following shown: /\ /\ /\ \ / \ / \ / \ \ / \ / \ / \/ \/ \/
kDAC_OneShotSawtoothWaveform0	Automatic waveform generation logic will create a single pattern and stop at the final value. It will remain at the finial value until a new active edge occurs on the SYNC input, and then the waveform will be repeated. Like this following shown: /\| /\| / \| / \| / \| / \| ____/ \|____/ \|___
kDAC_OneShotSawtoothWaveform1	Automatic waveform generation logic will create a single pattern and stop at the final value. It will remain at the finial value until a new active edge occurs on the SYNC input, and then the waveform will be repeated. Like this following shown: : \|\ \|\ \| \ \| \ \| \ \| \ ____\| \___\| \__

enum dac_sync_input_edge_t

Enumerator
kDAC_NoActiveEdge	No active edge is selected, it means the SYNC input is ignored.
kDAC_FallingEdge	Updates occur on the falling edge of the SYNC input.
kDAC_RisingEdge	Updates occur on the rising edge of the SYNC input.
kDAC_BothEdges	Updates occur on both edges of the SYNC input.

enum dac_speed_mode_t

Enumerator
kDAC_HighSpeedMode	In High Speed Mode, the setting time of the DAC module is 1us, but the DAC module uses more power.
kDAC_LowSpeedMode	In Low Speed Mode, the DAC module uses less power but takes more time to settle.

enum dac_watermark_level_t

Enumerator
kDAC_WatermarkValue0	Watermark value is 0.
kDAC_WatermarkValue2	Watermark value is 2.
kDAC_WatermarkValue4	Watermark value is 4.
kDAC_WatermarkValue6	Watermark value is 6.

enum dac_data_format_t

Enumerator
kDAC_DataWordRightJustified	The 12 bits data is right-justified.
kDAC_DataWordLeftJustified	The 12 bits data iss left-justified.

Function Documentation

void DAC_Init	(	DAC_Type *	base,
		const dac_config_t *	psConfig
	)

Parameters

base	DAC peripheral base address.
psConfig	The pointer to dac_config_t.

void DAC_Deinit ( DAC_Type * base )

Invoking this function to power down the analog portion of DAC and disable the DAC clock.

Parameters

base	DAC peripheral base address.

void DAC_GetDefaultConfig ( dac_config_t * psConfig )

psConfig->eOperationMode = kDAC_NormalOperationMode;
psConfig->uOperationConfig.sNormalModeConfig.u16DataFIFO = 0U;
psConfig->bEnableDMA                                       = false;
psConfig->eWatermarkLevel = kDAC_WatermarkValue2;
psConfig->eSyncInputEdge                                   = kDAC_RisingEdge;
psConfig->eSpeedMode                                       = kDAC_HighSpeedMode;
psConfig->eDataFormat                                      = kDAC_DataWordRightJustified;
psConfig->eSyncSignal                                        = kDAC_InternalClockSignal;
psConfig->bEnableAnalogPortion                          = false;
psConfig->bEnableGlitchFilter                              = true;
psConfig->u8GlitchFilterCount                              = 29U;

Parameters

psConfig The pointer to dac_config_t.

static void DAC_SetSyncEdge	(	DAC_Type *	base,
		dac_sync_input_edge_t	eSyncEdge
	)

static

Parameters

base	DAC peripheral base address.
eSyncEdge	The input edge to be set, please refer to dac_sync_input_edge_t for details.

static void DAC_SetLDOK ( DAC_Type * base )

inlinestatic

Note: Allows new values of minimum, maximum, and step value to be updated by active edge of SYNC_IN. This function should be invoked once new values of these buffered registers have been written by software. The LDOK bit will be cleared by an active edge of SYNC_IN.; This function is only useful when the operation mode is selected as Automatic operation mode.

Parameters

base	DAC peripheral base address.

static bool DAC_GetLDOKValue ( DAC_Type * base )

inlinestatic

Note: When the SYNC signal is selected as external SYNC_IN signal, the load okay bit will be cleared by an active edge of the SYNC_IN signal. This function can be used to check whether the active edge of the SYNC_IN signal has reached.; This function is only useful when the operation mode is selected as Automatic operation mode.

Parameters

base	DAC peripheral base address.

Returns

true The active edge of SYNC_IN signal has not reached when the SYNC signal is selected as external SYNC_IN signal.
false The active edge of SYNC_IN signal has reached when the SYNC signal is selected as external SYNC_IN signal

static void DAC_EnableOneShot	(	DAC_Type *	base,
		bool	bEnable
	)

inlinestatic

Note: This function only useful when the operation mode is selected as automatic operation mode.

Parameters

base	DAC peripheral base address.
bEnable	Enable/Disable oneshot feature. true Automatic waveform generation logic will create a single pattern and stop at the final value. false Automatic waveform generation logic will create a repeated (continuous) waveform upon receiving an active SYNC edge.

static void DAC_WriteDataFIFO	(	DAC_Type *	base,
		uint16_t	u16Data
	)

inlinestatic

Parameters

base	DAC peripheral base address.
u16Data	The DAC data to be converted to analog. If the data format is set as kDAC_DataWordRightJustified then u16Data should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16Data should range from 16 to 65520, which means the lower 4 bits is useless.

static void DAC_WriteStepSize	(	DAC_Type *	base,
		uint16_t	u16StepSize
	)

inlinestatic

Note: This function only useful when the operation mode is selected as automatic operation mode.

Parameters

base	DAC peripheral base address.
u16StepSize	The step value to be added to or subtracted from the current value. If the data format is set as kDAC_DataWordRightJustified then u16StepSize should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16StepSize should range from 16 to 65520, which means the lower 4 bits is useless.

static void DAC_WriteMinValue	(	DAC_Type *	base,
		uint16_t	u16MinValue
	)

inlinestatic

Note: This function only useful when the operation mode is selected as automatic operation mode. If DAC input data is less than the minium value, output is limited to the minium value during automatic waveform generation.

Parameters

base	DAC peripheral base address.
u16MinValue	The lower range limit during automatic waveform generation. If the data format is set as kDAC_DataWordRightJustified then u16MinValue should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16MinValue should range from 16 to 65520, which means the lower 4 bits is useless.

static void DAC_WriteMaxValue	(	DAC_Type *	base,
		uint16_t	u16MaxValue
	)

inlinestatic

Note: This function only useful when the operation mode is selected as automatic operation mode. If DAC input data is greater than maximum value, output is limited to maximum value during automatic waveform generation.

Parameters

base	DAC peripheral base address.
u16MaxValue	The upper range limit during automatic waveform generation. If the data format is set as kDAC_DataWordRightJustified then u16MaxValue should range from 0 to 4095, which means the higher 4 bits is useless. If the data format is set as kDAC_DataWordLeftJustified, then the u16MaxValue should range from 16 to 65520, which means the lower 4 bits is useless.

static void DAC_ConfigRefreshFrequency	(	DAC_Type *	base,
		uint16_t	u16CompareValue
	)

inlinestatic

Note: This function only useful when the operation mode is selected as automatic operation mode.

Parameters

base	DAC peripheral base address.
u16CompareValue	The compare value(0~65535). u16CompareValue=0 The generated waveform will be updated every clock cycle. u16CompareValue=N(N!=0) The generated waveform will be updated every N+1 clock cycles.

static void DAC_EnableDMA	(	DAC_Type *	base,
		bool	bEnable
	)

inlinestatic

Note: This function is only useful when the operation mode is selected as Normal mode.

Parameters

base	DAC peripheral base address.
bEnable	Enable/Disable DMA support. true Enable DMA support. false Disable DMA support.

static void DAC_SetWatermarkLevel	(	DAC_Type *	base,
		dac_watermark_level_t	eWatermarkLevel
	)

static

Note: When the level of FIFO is less than or equal to the Watermark level, a DMA request will be sent. This function is only useful when the operation mode is selected as Normal mode.

Parameters

base	DAC peripheral base address.
eWatermarkLevel	The watermark level of FIFO, please refer to dac_watermark_level_t for details.

static void DAC_EnableGlitchFilter	(	DAC_Type *	base,
		bool	bEnable
	)

inlinestatic

Parameters

base	DAC peripheral base address.
bEnable	Enable/Disable Glitch filter. true Enable glitch filter. false Disable glitch filter.

static void DAC_SetGlitchFilterCount	(	DAC_Type *	base,
		uint8_t	u8FilterCount
	)

inlinestatic

Parameters

base	DAC peripheral base address.
u8FilterCount	The count of glitch filter. This count represents the number of clock cycles for which the DAC output is held unchanged after new data is presented to the analog DAC's inputs.

static void DAC_SetSpeedMode	(	DAC_Type *	base,
		dac_speed_mode_t	eSpeedMode
	)

inlinestatic

Parameters

base	DAC peripheral base address.
eSpeedMode	The speedMode to be set, please refer to dac_speed_mode_t for details.

static void DAC_EnableAnalogPortion	(	DAC_Type *	base,
		bool	bEnable
	)

inlinestatic

The function controls the power-up of the analog portion of the DAC. If powered up the analog portion, the DAC module will output the value currently presented to the Data register. The analog portion should be powered up when the DAC is in use. If power down the analog portion, the output of the DAC module will be pulled low. The analog portion should be powered down when the DAC is not in use.

Parameters

base	DAC peripheral base address.
bEnable	Power up/down the analog portion of the DAC. true Power up the analog portion of the DAC, and the DAC will output the value currently presented to its inputs. false Power down the analog portion of the DAC, and its output will be pulled down.

static uint16_t DAC_GetFIFOStatusFlags ( DAC_Type * base )

inlinestatic

Parameters

base	DAC peripheral base address.

Returns: The status flags of DAC module, should be the OR'ed value of _dac_fifo_status_flags.

Read Guidance

Driver Overview

Data Structures

Enumerations

Driver version

Initialization And De-initialization Interfaces

Conversion Modes Related Interfaces

Operation Modes Related Interfaces

DMA Control Related Interfaces

Glitch Filter Related Interfaces

Power And Speed Related Interface

Status Flags Interface

Data Structure Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Data Fields

Field Documentation

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation