Detailed Description

Digital to Analog Converter (DAC) Peripheral API.

This module contains functions to control the DAC peripheral of Silicon Labs 32-bit MCUs and SoCs. The DAC converts digital values to analog signals at up to 500 ksps with 12-bit accuracy. The DAC is designed for low-energy consumption and can also provide very good performance.

Data Structures
struct	DAC_Init_TypeDef

struct	DAC_InitChannel_TypeDef

Macros
#define	DAC_INIT_DEFAULT

#define	DAC_INITCHANNEL_DEFAULT

Enumerations
enum	DAC_ConvMode_TypeDef { dacConvModeContinuous = _DAC_CTRL_CONVMODE_CONTINUOUS, dacConvModeSampleHold = _DAC_CTRL_CONVMODE_SAMPLEHOLD, dacConvModeSampleOff = _DAC_CTRL_CONVMODE_SAMPLEOFF }

enum	DAC_Output_TypeDef { dacOutputDisable = _DAC_CTRL_OUTMODE_DISABLE, dacOutputPin = _DAC_CTRL_OUTMODE_PIN, dacOutputADC = _DAC_CTRL_OUTMODE_ADC, dacOutputPinADC = _DAC_CTRL_OUTMODE_PINADC }

enum	DAC_PRSSEL_TypeDef { dacPRSSELCh0 = _DAC_CH0CTRL_PRSSEL_PRSCH0, dacPRSSELCh1 = _DAC_CH0CTRL_PRSSEL_PRSCH1, dacPRSSELCh2 = _DAC_CH0CTRL_PRSSEL_PRSCH2, dacPRSSELCh3 = _DAC_CH0CTRL_PRSSEL_PRSCH3, dacPRSSELCh4 = _DAC_CH0CTRL_PRSSEL_PRSCH4, dacPRSSELCh5 = _DAC_CH0CTRL_PRSSEL_PRSCH5, dacPRSSELCh6 = _DAC_CH0CTRL_PRSSEL_PRSCH6, dacPRSSELCh7 = _DAC_CH0CTRL_PRSSEL_PRSCH7 }

enum	DAC_Ref_TypeDef { dacRef1V25 = _DAC_CTRL_REFSEL_1V25, dacRef2V5 = _DAC_CTRL_REFSEL_2V5, dacRefVDD = _DAC_CTRL_REFSEL_VDD }

enum	DAC_Refresh_TypeDef { dacRefresh8 = _DAC_CTRL_REFRSEL_8CYCLES, dacRefresh16 = _DAC_CTRL_REFRSEL_16CYCLES, dacRefresh32 = _DAC_CTRL_REFRSEL_32CYCLES, dacRefresh64 = _DAC_CTRL_REFRSEL_64CYCLES }

Functions
__STATIC_INLINE void	DAC_Channel0OutputSet ( DAC_TypeDef *dac, uint32_t value)
	Set the output signal of DAC channel 0 to a given value.

__STATIC_INLINE void	DAC_Channel1OutputSet ( DAC_TypeDef *dac, uint32_t value)
	Set the output signal of DAC channel 1 to a given value.

void	DAC_ChannelOutputSet ( DAC_TypeDef *dac, unsigned int channel, uint32_t value)
	Set the output signal of a DAC channel to a given value.

void	DAC_Enable ( DAC_TypeDef *dac, unsigned int ch, bool enable)
	Enable/disable the DAC channel.

void	DAC_Init ( DAC_TypeDef dac, const DAC_Init_TypeDef init)
	Initialize DAC.

void	DAC_InitChannel ( DAC_TypeDef dac, const DAC_InitChannel_TypeDef init, unsigned int ch)
	Initialize DAC channel.

__STATIC_INLINE void	DAC_IntClear ( DAC_TypeDef *dac, uint32_t flags)
	Clear one or more pending DAC interrupts.

__STATIC_INLINE void	DAC_IntDisable ( DAC_TypeDef *dac, uint32_t flags)
	Disable one or more DAC interrupts.

__STATIC_INLINE void	DAC_IntEnable ( DAC_TypeDef *dac, uint32_t flags)
	Enable one or more DAC interrupts.

__STATIC_INLINE uint32_t	DAC_IntGet ( DAC_TypeDef *dac)
	Get pending DAC interrupt flags.

__STATIC_INLINE uint32_t	DAC_IntGetEnabled ( DAC_TypeDef *dac)
	Get enabled and pending DAC interrupt flags. Useful for handling more interrupt sources in the same interrupt handler.

__STATIC_INLINE void	DAC_IntSet ( DAC_TypeDef *dac, uint32_t flags)
	Set one or more pending DAC interrupts from SW.

uint8_t	DAC_PrescaleCalc (uint32_t dacFreq, uint32_t hfperFreq)
	Calculate prescaler value used to determine the DAC clock.

void	DAC_Reset ( DAC_TypeDef *dac)
	Reset DAC to the same state that it was in after a hardware reset.

Macro Definition Documentation

#define DAC_INIT_DEFAULT

Value:

         { \
        
         dacRefresh8,
         
          /* Refresh every 8 prescaled cycles. */
         
         \
        
         dacRef1V25,
         
          /* 1.25V internal reference. */
         
         \
        
         dacOutputPin,
         
          /* Output to pin only. */
         
         \
        
         dacConvModeContinuous,
         
          /* Continuous mode. */
         
         \
        
         0,
         
          /* No prescaling. */
         
         \
        
         false,
         
          /* Do not enable low pass filter. */
         
         \
        
         false,
         
          /* Do not reset prescaler on ch0 start. */
         
         \
        
         false,
         
          /* DAC output enable always on. */
         
         \
        
         false,
         
          /* Disable sine mode. */
         
         \
        
         false
         
          /* Single ended mode. */
         
         \
        
         }

Default configuration for DAC initialization structure.

Definition at line 171 of file em_dac.h .

#define DAC_INITCHANNEL_DEFAULT

Value:

         { \
        
         false,
         
          /* Leave channel disabled when initialization done. */
         
         \
        
         false,
         
          /* Disable PRS triggering. */
         
         \
        
         false,
         
          /* Channel not refreshed automatically. */
         
         \
        
         dacPRSSELCh0
         
          /* Select PRS ch0 (if PRS triggering enabled). */
         
         \
        
         }

Default configuration for DAC channel initialization structure.

Definition at line 211 of file em_dac.h .

Enumeration Type Documentation

enum DAC_ConvMode_TypeDef

Conversion mode.

Enumerator
dacConvModeContinuous	Continuous mode.
dacConvModeSampleHold	Sample/hold mode.
dacConvModeSampleOff	Sample/shut off mode.

Definition at line 69 of file em_dac.h .

enum DAC_Output_TypeDef

Output mode.

Enumerator
dacOutputDisable	Output to pin and ADC disabled.
dacOutputPin	Output to pin only.
dacOutputADC	Output to ADC only
dacOutputPinADC	Output to pin and ADC.

Definition at line 76 of file em_dac.h .

enum DAC_PRSSEL_TypeDef

Peripheral Reflex System signal used to trigger single sample.

Enumerator
dacPRSSELCh0	PRS channel 0.
dacPRSSELCh1	PRS channel 1.
dacPRSSELCh2	PRS channel 2.
dacPRSSELCh3	PRS channel 3.
dacPRSSELCh4	PRS channel 4.
dacPRSSELCh5	PRS channel 5.
dacPRSSELCh6	PRS channel 6.
dacPRSSELCh7	PRS channel 7.

Definition at line 84 of file em_dac.h .

enum DAC_Ref_TypeDef

Reference voltage for DAC.

Enumerator
dacRef1V25	Internal 1.25V bandgap reference.
dacRef2V5	Internal 2.5V bandgap reference.
dacRefVDD	VDD reference.

Definition at line 116 of file em_dac.h .

enum DAC_Refresh_TypeDef

Refresh interval.

Enumerator
dacRefresh8	Refresh every 8 prescaled cycles.
dacRefresh16	Refresh every 16 prescaled cycles.
dacRefresh32	Refresh every 32 prescaled cycles.
dacRefresh64	Refresh every 64 prescaled cycles.

Definition at line 123 of file em_dac.h .

Function Documentation

__STATIC_INLINE void DAC_Channel0OutputSet	(	DAC_TypeDef *	`dac,`
		uint32_t	`value`
	)

Set the output signal of DAC channel 0 to a given value.

This function sets the output signal of DAC channel 0 by writing value to the CH0DATA register.

Parameters

[in]	`dac`	Pointer to DAC peripheral register block.
[in]	`value`	Value to write to the channel 0 output register CH0DATA.

Definition at line 246 of file em_dac.h .

References _DAC_CH0DATA_MASK , and DAC_TypeDef::CH0DATA .

Referenced by DAC_ChannelOutputSet() .

__STATIC_INLINE void DAC_Channel1OutputSet	(	DAC_TypeDef *	`dac,`
		uint32_t	`value`
	)

Set the output signal of DAC channel 1 to a given value.

Sets the output signal of DAC channel 1 by writing value to the CH1DATA register.

Parameters

[in]	`dac`	Pointer to DAC peripheral register block.
[in]	`value`	Value to write to the channel 1 output register CH1DATA.

Definition at line 267 of file em_dac.h .

References _DAC_CH1DATA_MASK , and DAC_TypeDef::CH1DATA .

Referenced by DAC_ChannelOutputSet() .

void DAC_ChannelOutputSet	(	DAC_TypeDef *	`dac,`
		unsigned int	`channel,`
		uint32_t	`value`
	)

Set the output signal of a DAC channel to a given value.

This function sets the output signal of a DAC channel by writing value to the corresponding CHnDATA register.

Parameters

[in]	`dac`	A pointer to the DAC peripheral register block.
[in]	`channel`	A channel number to set the output.
[in]	`value`	A value to write to the channel output register CHnDATA.

Definition at line 230 of file em_dac.c .

References DAC_Channel0OutputSet() , and DAC_Channel1OutputSet() .

void DAC_Enable	(	DAC_TypeDef *	`dac,`
		unsigned int	`ch,`
		bool	`enable`
	)

Enable/disable the DAC channel.

Parameters

[in]	`dac`	A pointer to the DAC peripheral register block.
[in]	`ch`	A channel to enable/disable.
[in]	`enable`	true to enable DAC channel, false to disable.

Definition at line 86 of file em_dac.c .

References _DAC_CH0CTRL_EN_SHIFT , BUS_RegBitWrite() , DAC_TypeDef::CH0CTRL , and DAC_TypeDef::CH1CTRL .

void DAC_Init	(	DAC_TypeDef *	`dac,`
		const DAC_Init_TypeDef *	`init`
	)

Initialize DAC.

Initializes common parts for both channels. In addition, channel control configuration must be done. See DAC_InitChannel() .

Note: This function will disable both channels prior to configuration.

Parameters

[in]	`dac`	A pointer to the DAC peripheral register block.
[in]	`init`	A pointer to the DAC initialization structure.

Definition at line 119 of file em_dac.c .

void DAC_InitChannel	(	DAC_TypeDef *	`dac,`
		const DAC_InitChannel_TypeDef *	`init,`
		unsigned int	`ch`
	)

Initialize DAC channel.

Parameters

[in]	`dac`	A pointer to the DAC peripheral register block.
[in]	`init`	A pointer to the DAC initialization structure.
[in]	`ch`	A channel number to initialize.

Definition at line 183 of file em_dac.c .

References _DAC_CH0CTRL_PRSSEL_SHIFT , DAC_TypeDef::CH0CTRL , DAC_TypeDef::CH1CTRL , DAC_CH0CTRL_EN , DAC_CH0CTRL_PRSEN , DAC_CH0CTRL_REFREN , DAC_InitChannel_TypeDef::enable , DAC_InitChannel_TypeDef::prsEnable , DAC_InitChannel_TypeDef::prsSel , and DAC_InitChannel_TypeDef::refreshEnable .

__STATIC_INLINE void DAC_IntClear	(	DAC_TypeDef *	`dac,`
		uint32_t	`flags`
	)

Clear one or more pending DAC interrupts.

Parameters

[in]	`dac`	Pointer to DAC peripheral register block.
[in]	`flags`	Pending DAC interrupt source to clear. Use a bitwise logic OR combination of valid interrupt flags for the DAC module (DAC_IF_nnn).

Definition at line 285 of file em_dac.h .

References DAC_TypeDef::IFC .

__STATIC_INLINE void DAC_IntDisable	(	DAC_TypeDef *	`dac,`
		uint32_t	`flags`
	)

Disable one or more DAC interrupts.

Parameters

[in]	`dac`	Pointer to DAC peripheral register block.
[in]	`flags`	DAC interrupt sources to disable. Use a bitwise logic OR combination of valid interrupt flags for the DAC module (DAC_IF_nnn).

Definition at line 301 of file em_dac.h .

References DAC_TypeDef::IEN .

__STATIC_INLINE void DAC_IntEnable	(	DAC_TypeDef *	`dac,`
		uint32_t	`flags`
	)

Enable one or more DAC interrupts.

Note: Depending on the use, a pending interrupt may already be set prior to enabling the interrupt. To ignore a pending interrupt, consider using DAC_IntClear() prior to enabling the interrupt.

Parameters

[in]	`dac`	Pointer to DAC peripheral register block.
[in]	`flags`	DAC interrupt sources to enable. Use a bitwise logic OR combination of valid interrupt flags for the DAC module (DAC_IF_nnn).

Definition at line 322 of file em_dac.h .

References DAC_TypeDef::IEN .

__STATIC_INLINE uint32_t DAC_IntGet ( DAC_TypeDef * dac )

Get pending DAC interrupt flags.

Note: Event bits are not cleared by the use of this function.

Parameters

[in] dac Pointer to DAC peripheral register block.

Returns: DAC interrupt sources pending. A bitwise logic OR combination of valid interrupt flags for the DAC module (DAC_IF_nnn).

Definition at line 341 of file em_dac.h .

References DAC_TypeDef::IF .

__STATIC_INLINE uint32_t DAC_IntGetEnabled ( DAC_TypeDef * dac )

Get enabled and pending DAC interrupt flags. Useful for handling more interrupt sources in the same interrupt handler.

Parameters

[in] dac Pointer to DAC peripheral register block.

Note: Interrupt flags are not cleared by the use of this function.

Returns

Pending and enabled DAC interrupt sources. Return value is the bitwise AND combination of

the OR combination of enabled interrupt sources in DACx_IEN_nnn register (DACx_IEN_nnn) and
the OR combination of valid interrupt flags of the DAC module (DACx_IF_nnn).

Definition at line 365 of file em_dac.h .

References DAC_TypeDef::IEN , and DAC_TypeDef::IF .

__STATIC_INLINE void DAC_IntSet	(	DAC_TypeDef *	`dac,`
		uint32_t	`flags`
	)

Set one or more pending DAC interrupts from SW.

Parameters

[in]	`dac`	Pointer to DAC peripheral register block.
[in]	`flags`	DAC interrupt sources to set to pending. Use a bitwise logic OR combination of valid interrupt flags for the DAC module (DAC_IF_nnn).

Definition at line 388 of file em_dac.h .

References DAC_TypeDef::IFS .

uint8_t DAC_PrescaleCalc	(	uint32_t	`dacFreq,`
		uint32_t	`hfperFreq`
	)

Calculate prescaler value used to determine the DAC clock.

The DAC clock is given by: HFPERCLK / (prescale ^ 2). If the requested DAC frequency is low and the maximum prescaler value can't adjust the actual DAC frequency lower than the requested DAC frequency, the maximum prescaler value is returned resulting in a higher DAC frequency than requested.

Parameters

[in]	`dacFreq`	DAC frequency wanted. The frequency will automatically be adjusted to be below the maximum allowed DAC clock.
[in]	`hfperFreq`	Frequency in Hz of the reference HFPER clock. Set to 0 to use the currently defined HFPER clock setting.

Returns: Prescaler value to use for DAC to achieve a clock value <= dacFreq .

Definition at line 268 of file em_dac.c .

References _DAC_CTRL_PRESC_MASK , _DAC_CTRL_PRESC_SHIFT , CMU_ClockFreqGet() , and cmuClock_HFPER .

void DAC_Reset ( DAC_TypeDef * dac )

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

Parameters

[in] dac A pointer to the ADC peripheral register block.

Definition at line 307 of file em_dac.c .

References _DAC_BIASPROG_RESETVALUE , _DAC_CH0CTRL_RESETVALUE , _DAC_CH1CTRL_RESETVALUE , _DAC_CTRL_RESETVALUE , _DAC_IEN_RESETVALUE , _DAC_IFC_MASK , DAC_TypeDef::BIASPROG , DAC_TypeDef::CAL , DAC_TypeDef::CH0CTRL , DAC_TypeDef::CH1CTRL , DAC_TypeDef::CTRL , DEVINFO , DAC_TypeDef::IEN , and DAC_TypeDef::IFC .

DACEMLIB

Detailed Description

Data Structures

Macros

Enumerations

Functions

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation