Detailed Description

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

The current digital-to-analog converter (IDAC) can source or sink a configurable constant current, which can be output on, or sinked from pin or ADC. The current is configurable with several ranges of various step sizes. The IDAC can be used with PRS and it 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 the 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);

Data Structures
struct	IDAC_Init_TypeDef

Macros
#define	IDAC_INIT_DEFAULT

Enumerations
enum	IDAC_OutMode_TypeDef { idacOutputPin = IDAC_CTRL_OUTMODE_PIN, idacOutputADC = IDAC_CTRL_OUTMODE_ADC }

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 }

enum	IDAC_Range_TypeDef { idacCurrentRange0 = IDAC_CURPROG_RANGESEL_RANGE0, idacCurrentRange1 = IDAC_CURPROG_RANGESEL_RANGE1, idacCurrentRange2 = IDAC_CURPROG_RANGESEL_RANGE2, idacCurrentRange3 = IDAC_CURPROG_RANGESEL_RANGE3 }

Functions
void	IDAC_Enable (IDAC_TypeDef *idac, bool enable)
	Enable/disable IDAC. More...

void	IDAC_Init (IDAC_TypeDef idac, const IDAC_Init_TypeDef init)
	Initialize IDAC. More...

void	IDAC_MinimalOutputTransitionMode (IDAC_TypeDef *idac, bool enable)
	Enable/disable Minimal Output Transition mode. More...

void	IDAC_OutEnable (IDAC_TypeDef *idac, bool enable)
	Enable/disable the IDAC OUT pin. More...

void	IDAC_RangeSet (IDAC_TypeDef *idac, const IDAC_Range_TypeDef range)
	Set the current range of the IDAC output. More...

void	IDAC_Reset (IDAC_TypeDef *idac)
	Reset IDAC to same state as after a HW reset. More...

void	IDAC_StepSet (IDAC_TypeDef *idac, const uint32_t step)
	Set the current step of the IDAC output. More...

Macro Definition Documentation

#define IDAC_INIT_DEFAULT

Value:

{                                                                      \
  false,                    \
  idacOutputPin,                     \
  false,                                \
  idacPRSSELCh0,    \
  false                              \
}

Default config for IDAC init structure.

Definition at line 200 of file em_idac.h.

Enumeration Type Documentation

enum IDAC_OutMode_TypeDef

Output mode.

Enumerator
idacOutputPin	Output to IDAC OUT pin
idacOutputADC	Output to ADC

Definition at line 93 of file em_idac.h.

enum IDAC_PRSSEL_TypeDef

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

Definition at line 137 of file em_idac.h.

enum 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.

Definition at line 159 of file em_idac.h.

Function Documentation

void IDAC_Enable	(	IDAC_TypeDef *	idac,
		bool	enable
	)

Enable/disable IDAC.

Parameters

[in]	idac	Pointer to IDAC peripheral register block.
[in]	enable	true to enable IDAC, false to disable.

Definition at line 120 of file em_idac.c.

References _IDAC_CTRL_EN_SHIFT, BUS_RegBitWrite(), and IDAC_TypeDef::CTRL.

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

Initialize IDAC.

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

Note: This function will disable the IDAC prior to configuration.

Parameters

[in]	idac	Pointer to IDAC peripheral register block.
[in]	init	Pointer to IDAC initialization structure.

Definition at line 79 of file em_idac.c.

References IDAC_TypeDef::CTRL, IDAC_Init_TypeDef::enable, IDAC_CTRL_CURSINK, IDAC_CTRL_EN, IDAC_CTRL_OUTENPRS, IDAC_Init_TypeDef::outMode, IDAC_Init_TypeDef::prsEnable, IDAC_Init_TypeDef::prsSel, and IDAC_Init_TypeDef::sinkEnable.

void IDAC_MinimalOutputTransitionMode	(	IDAC_TypeDef *	idac,
		bool	enable
	)

Enable/disable Minimal Output Transition mode.

Parameters

[in]	idac	Pointer to IDAC peripheral register block.
[in]	enable	true to enable Minimal Output Transition mode, false to disable.

Definition at line 173 of file em_idac.c.

References _IDAC_CTRL_MINOUTTRANS_SHIFT, BUS_RegBitWrite(), and IDAC_TypeDef::CTRL.

void IDAC_OutEnable	(	IDAC_TypeDef *	idac,
		bool	enable
	)

Enable/disable the IDAC OUT pin.

Parameters

[in]	idac	Pointer to IDAC peripheral register block.
[in]	enable	true to enable the IDAC OUT pin, false to disable.

Definition at line 347 of file em_idac.c.

References _IDAC_CTRL_OUTEN_SHIFT, BUS_RegBitWrite(), and IDAC_TypeDef::CTRL.

void IDAC_RangeSet	(	IDAC_TypeDef *	idac,
		const IDAC_Range_TypeDef	range
	)

Set the current range of the IDAC output.

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.

Parameters

[in]	idac	Pointer to IDAC peripheral register block.
[in]	range	Current range value.

Definition at line 196 of file em_idac.c.

void IDAC_Reset ( IDAC_TypeDef * idac )

Reset IDAC to same state as after a HW reset.

Parameters

[in] idac Pointer to IDAC peripheral register block.

Definition at line 134 of file em_idac.c.

References _IDAC_CAL_RESETVALUE, _IDAC_CTRL_RESETVALUE, _IDAC_CURPROG_RESETVALUE, _IDAC_CURPROG_STEPSEL_SHIFT, _IDAC_DUTYCONFIG_RESETVALUE, IDAC_TypeDef::CAL, IDAC_TypeDef::CTRL, IDAC_TypeDef::CURPROG, IDAC_TypeDef::DUTYCONFIG, IDAC_CTRL_EN, IDAC_CURPROG_RANGESEL_RANGE0, and IDAC_DUTYCONFIG_DUTYCYCLEEN.

void IDAC_StepSet	(	IDAC_TypeDef *	idac,
		const uint32_t	step
	)

Set the current step of the IDAC output.

Parameters

[in]	idac	Pointer to IDAC peripheral register block.
[in]	step	Step value for IDAC output. Valid range is 0-31.

Definition at line 323 of file em_idac.c.

References _IDAC_CURPROG_STEPSEL_MASK, _IDAC_CURPROG_STEPSEL_SHIFT, and IDAC_TypeDef::CURPROG.

Detailed Description

Data Structures

Macros

Enumerations

Functions

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation