IDAC - Current DAC#

Current Digital-to-Analog Converter (IDAC) Peripheral API.

IDAC can source or sink a configurable constant current, which can be output on, or sinked from pin or ADC. Current is configurable with several ranges of various step sizes. IDAC can be used with PRS and can operate down to EM3.

The following steps are necessary for basic operation:

Clock enable:

/* IDAC is a HFPERCLK peripheral */
CMU_ClockEnable(cmuClock_HFPER, true);
CMU_ClockEnable(cmuClock_IDAC0, true);

Initialize peripheral with default settings and modify selected fields, such as output select:

/* Initialize with default settings. Change output to ADC. */
IDAC_Init_TypeDef init = IDAC_INIT_DEFAULT;
init.outMode = idacOutputADC;
IDAC_Init(IDAC0, &init);

Set output:

/* Set 50nA step and enable output */
IDAC_StepSet(IDAC0, 0);
IDAC_OutEnable(IDAC0, true);

Modules#

IDAC_Init_TypeDef

Enumerations#

enum

IDAC_OutMode_TypeDef {

idacOutputPin = IDAC_CTRL_OUTMODE_PIN

idacOutputADC = IDAC_CTRL_OUTMODE_ADC

}

Output mode.

enum

IDAC_PRSSEL_TypeDef {

idacPRSSELCh0 = IDAC_CTRL_PRSSEL_PRSCH0

idacPRSSELCh1 = IDAC_CTRL_PRSSEL_PRSCH1

idacPRSSELCh2 = IDAC_CTRL_PRSSEL_PRSCH2

idacPRSSELCh3 = IDAC_CTRL_PRSSEL_PRSCH3

idacPRSSELCh4 = IDAC_CTRL_PRSSEL_PRSCH4

idacPRSSELCh5 = IDAC_CTRL_PRSSEL_PRSCH5

}

Selects which Peripheral Reflex System (PRS) signal to use when PRS is set to control IDAC output.

enum

IDAC_Range_TypeDef {

idacCurrentRange0 = IDAC_CURPROG_RANGESEL_RANGE0

idacCurrentRange1 = IDAC_CURPROG_RANGESEL_RANGE1

idacCurrentRange2 = IDAC_CURPROG_RANGESEL_RANGE2

idacCurrentRange3 = IDAC_CURPROG_RANGESEL_RANGE3

}

Selects which current range to use.

Functions#

void

IDAC_Init(IDAC_TypeDef *idac, const IDAC_Init_TypeDef *init)

Initialize IDAC.

void

IDAC_Enable(IDAC_TypeDef *idac, bool enable)

Enable/disable IDAC.

void

IDAC_Reset(IDAC_TypeDef *idac)

Reset IDAC to the same state that it was in after a hardware reset.

void

IDAC_MinimalOutputTransitionMode(IDAC_TypeDef *idac, bool enable)

Enable/disable Minimal Output Transition mode.

void

IDAC_RangeSet(IDAC_TypeDef *idac, const IDAC_Range_TypeDef range)

Set the current range of the IDAC output.

void

IDAC_StepSet(IDAC_TypeDef *idac, const uint32_t step)

Set the current step of the IDAC output.

void

IDAC_OutEnable(IDAC_TypeDef *idac, bool enable)

Enable/disable the IDAC OUT pin.

Macros#

#define

IDAC_INIT_DEFAULT undefined

Default configuration for IDAC initialization structure.

Enumeration Documentation#

IDAC_OutMode_TypeDef#

IDAC_OutMode_TypeDef

Output mode.

Enumerator
idacOutputPin	Output to IDAC OUT pin.
idacOutputADC	Output to ADC.

IDAC_PRSSEL_TypeDef#

IDAC_PRSSEL_TypeDef

Selects which Peripheral Reflex System (PRS) signal to use when PRS is set to control IDAC output.

Enumerator
idacPRSSELCh0	PRS channel 0.
idacPRSSELCh1	PRS channel 1.
idacPRSSELCh2	PRS channel 2.
idacPRSSELCh3	PRS channel 3.
idacPRSSELCh4	PRS channel 4.
idacPRSSELCh5	PRS channel 5.

IDAC_Range_TypeDef#

IDAC_Range_TypeDef

Selects which current range to use.

Enumerator
idacCurrentRange0	current range 0.
idacCurrentRange1	current range 1.
idacCurrentRange2	current range 2.
idacCurrentRange3	current range 3.

Function Documentation#

IDAC_Init#

void IDAC_Init (IDAC_TypeDef * idac, const IDAC_Init_TypeDef * init)

Initialize IDAC.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.
const IDAC_Init_TypeDef *	[in]	init	A pointer to the IDAC initialization structure.

Initializes IDAC according to the initialization structure parameter and sets the default calibration value stored in the DEVINFO structure.

Note

This function will disable IDAC prior to configuration.

IDAC_Enable#

void IDAC_Enable (IDAC_TypeDef * idac, bool enable)

Enable/disable IDAC.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.
bool	[in]	enable	True to enable IDAC, false to disable.

IDAC_Reset#

void IDAC_Reset (IDAC_TypeDef * idac)

Reset IDAC to the same state that it was in after a hardware reset.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.

IDAC_MinimalOutputTransitionMode#

void IDAC_MinimalOutputTransitionMode (IDAC_TypeDef * idac, bool enable)

Enable/disable Minimal Output Transition mode.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.
bool	[in]	enable	True to enable Minimal Output Transition mode, false to disable.

IDAC_RangeSet#

void IDAC_RangeSet (IDAC_TypeDef * idac, const IDAC_Range_TypeDef range)

Set the current range of the IDAC output.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.
const IDAC_Range_TypeDef	[in]	range	The current range value.

This function sets the current range of the IDAC output. The function also updates the IDAC calibration register (IDAC_CAL) with the default calibration value from DEVINFO (factory calibration) corresponding to the specified range.

IDAC_StepSet#

void IDAC_StepSet (IDAC_TypeDef * idac, const uint32_t step)

Set the current step of the IDAC output.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.
const uint32_t	[in]	step	A step value for the IDAC output. A valid range is 0-31.

IDAC_OutEnable#

void IDAC_OutEnable (IDAC_TypeDef * idac, bool enable)

Enable/disable the IDAC OUT pin.

Parameters

Type	Direction	Argument Name	Description
IDAC_TypeDef *	[in]	idac	A pointer to the IDAC peripheral register block.
bool	[in]	enable	True to enable the IDAC OUT pin, false to disable.

Warnings

This function will not enable/disable the IDAC OUT pin if APORTOUTENPRS is set because output enable will be controlled by PRS.