Detailed Description

Energy Management Unit (EMU) Peripheral API.

This module contains functions to control the EMU peripheral of Silicon Labs 32-bit MCUs and SoCs. The EMU handles the different low energy modes in Silicon Labs microcontrollers.

Data Structures
struct	EMU_DCDCInit_TypeDef

struct	EMU_EM01Init_TypeDef

struct	EMU_EM23Init_TypeDef

struct	EMU_EM4Init_TypeDef

struct	EMU_VmonHystInit_TypeDef

struct	EMU_VmonInit_TypeDef

Macros
#define	EMU_DCDCINIT_DEFAULT

#define	EMU_EM01INIT_DEFAULT

#define	EMU_EM23INIT_DEFAULT

#define	EMU_EM4INIT_DEFAULT

#define	EMU_VMONHYSTINIT_DEFAULT

#define	EMU_VMONINIT_DEFAULT

#define	EMU_VSCALE_PRESENT

#define	emuDcdcLnFastTransient 160

#define	emuDcdcLnHighEfficiency -1

#define	PWRCFG_DCDCTODVDD_VMAX 3000U

#define	PWRCFG_DCDCTODVDD_VMIN 1800U

Typedefs
typedef int16_t	EMU_DcdcLnReverseCurrentControl_TypeDef

Enumerations
enum	EMU_BODMode_TypeDef { emuBODMode_Active , emuBODMode_Inactive }

enum	EMU_DcdcAnaPeripheralPower_TypeDef { emuDcdcAnaPeripheralPower_AVDD = EMU_PWRCTRL_ANASW_AVDD, emuDcdcAnaPeripheralPower_DCDC = EMU_PWRCTRL_ANASW_DVDD }

enum	EMU_DcdcConductionMode_TypeDef { emuDcdcConductionMode_ContinuousLN , emuDcdcConductionMode_DiscontinuousLN }

enum	EMU_DcdcLnCompCtrl_TypeDef { emuDcdcLnCompCtrl_1u0F , emuDcdcLnCompCtrl_4u7F }

enum	EMU_DcdcLnRcoBand_TypeDef { emuDcdcLnRcoBand_3MHz = 0, emuDcdcLnRcoBand_4MHz = 1, emuDcdcLnRcoBand_5MHz = 2, emuDcdcLnRcoBand_6MHz = 3, emuDcdcLnRcoBand_7MHz = 4, emuDcdcLnRcoBand_8MHz = 5, emuDcdcLnRcoBand_9MHz = 6, emuDcdcLnRcoBand_10MHz = 7 }

enum	EMU_DcdcMode_TypeDef { emuDcdcMode_Bypass = EMU_DCDCCTRL_DCDCMODE_BYPASS, emuDcdcMode_LowNoise = EMU_DCDCCTRL_DCDCMODE_LOWNOISE, emuDcdcMode_LowPower = EMU_DCDCCTRL_DCDCMODE_LOWPOWER }

enum	EMU_EM4PinRetention_TypeDef { emuPinRetentionDisable = EMU_EM4CTRL_EM4IORETMODE_DISABLE, emuPinRetentionEm4Exit = EMU_EM4CTRL_EM4IORETMODE_EM4EXIT, emuPinRetentionLatch = EMU_EM4CTRL_EM4IORETMODE_SWUNLATCH }

enum	EMU_EM4State_TypeDef { emuEM4Shutoff = 0, emuEM4Hibernate = 1 }

enum	EMU_PeripheralRetention_TypeDef { emuPeripheralRetention_LEUART0 = _EMU_EM23PERNORETAINCTRL_LEUART0DIS_MASK, emuPeripheralRetention_CSEN = _EMU_EM23PERNORETAINCTRL_CSENDIS_MASK, emuPeripheralRetention_LESENSE0 = _EMU_EM23PERNORETAINCTRL_LESENSE0DIS_MASK, emuPeripheralRetention_WDOG1 = _EMU_EM23PERNORETAINCTRL_WDOG1DIS_MASK, emuPeripheralRetention_WDOG0 = _EMU_EM23PERNORETAINCTRL_WDOG0DIS_MASK, emuPeripheralRetention_LETIMER0 = _EMU_EM23PERNORETAINCTRL_LETIMER0DIS_MASK, emuPeripheralRetention_ADC0 = _EMU_EM23PERNORETAINCTRL_ADC0DIS_MASK, emuPeripheralRetention_IDAC0 = _EMU_EM23PERNORETAINCTRL_IDAC0DIS_MASK, emuPeripheralRetention_VDAC0 = _EMU_EM23PERNORETAINCTRL_VDAC0DIS_MASK, emuPeripheralRetention_I2C1 = _EMU_EM23PERNORETAINCTRL_I2C1DIS_MASK, emuPeripheralRetention_I2C0 = _EMU_EM23PERNORETAINCTRL_I2C0DIS_MASK, emuPeripheralRetention_ACMP1 = _EMU_EM23PERNORETAINCTRL_ACMP1DIS_MASK, emuPeripheralRetention_ACMP0 = _EMU_EM23PERNORETAINCTRL_ACMP0DIS_MASK, emuPeripheralRetention_PCNT2 = _EMU_EM23PERNORETAINCTRL_PCNT2DIS_MASK, emuPeripheralRetention_PCNT1 = _EMU_EM23PERNORETAINCTRL_PCNT1DIS_MASK, emuPeripheralRetention_PCNT0 = _EMU_EM23PERNORETAINCTRL_PCNT0DIS_MASK, emuPeripheralRetention_D1 , emuPeripheralRetention_D2 , emuPeripheralRetention_ALL }

enum	EMU_PowerConfig_TypeDef { emuPowerConfig_DcdcToDvdd }

enum	EMU_VmonChannel_TypeDef { emuVmonChannel_AVDD , emuVmonChannel_ALTAVDD , emuVmonChannel_DVDD , emuVmonChannel_IOVDD0 }

enum	EMU_VScaleEM01_TypeDef { emuVScaleEM01_HighPerformance = _EMU_STATUS_VSCALE_VSCALE2, emuVScaleEM01_LowPower = _EMU_STATUS_VSCALE_VSCALE0 }

enum	EMU_VScaleEM23_TypeDef { emuVScaleEM23_FastWakeup = _EMU_CTRL_EM23VSCALE_VSCALE2, emuVScaleEM23_LowPower = _EMU_CTRL_EM23VSCALE_VSCALE0 }

enum	EMU_VScaleEM4H_TypeDef { emuVScaleEM4H_FastWakeup = _EMU_CTRL_EM4HVSCALE_VSCALE2, emuVScaleEM4H_LowPower = _EMU_CTRL_EM4HVSCALE_VSCALE0 }

Functions
void	EMU_DCDCConductionModeSet ( EMU_DcdcConductionMode_TypeDef conductionMode, bool rcoDefaultSet)

bool	EMU_DCDCInit (const EMU_DCDCInit_TypeDef *dcdcInit)

void	EMU_DCDCLnRcoBandSet ( EMU_DcdcLnRcoBand_TypeDef band)

void	EMU_DCDCModeSet ( EMU_DcdcMode_TypeDef dcdcMode)

void	EMU_DCDCOptimizeSlice (uint32_t em0LoadCurrentmA)

bool	EMU_DCDCOutputVoltageSet (uint32_t mV, bool setLpVoltage, bool setLnVoltage)

bool	EMU_DCDCPowerOff (void)

void	EMU_EM01Init (const EMU_EM01Init_TypeDef *em01Init)
	Update the EMU module with Energy Mode 0 and 1 configuration.

void	EMU_EM23Init (const EMU_EM23Init_TypeDef *em23Init)
	Update the EMU module with Energy Mode 2 and 3 configuration.

__STATIC_INLINE void	EMU_EM2Block (void)
	Block entering EM2 or higher number energy modes.

__STATIC_INLINE void	EMU_EM2UnBlock (void)
	Unblock entering EM2 or higher number energy modes.

void	EMU_EM4Init (const EMU_EM4Init_TypeDef *em4Init)
	Update the EMU module with Energy Mode 4 configuration.

__STATIC_INLINE void	EMU_EnterEM1 (void)
	Enter energy mode 1 (EM1).

void	EMU_EnterEM2 (bool restore)
	Enter energy mode 2 (EM2).

void	EMU_EnterEM3 (bool restore)
	Enter energy mode 3 (EM3).

void	EMU_EnterEM4 (void)
	Enter energy mode 4 (EM4).

void	EMU_EnterEM4H (void)
	Enter energy mode 4 hibernate (EM4H).

void	EMU_EnterEM4S (void)
	Enter energy mode 4 shutoff (EM4S).

__STATIC_INLINE void	EMU_IntClear (uint32_t flags)
	Clear one or more pending EMU interrupts.

__STATIC_INLINE void	EMU_IntDisable (uint32_t flags)
	Disable one or more EMU interrupts.

__STATIC_INLINE void	EMU_IntEnable (uint32_t flags)
	Enable one or more EMU interrupts.

__STATIC_INLINE uint32_t	EMU_IntGet (void)
	Get pending EMU interrupt flags.

__STATIC_INLINE uint32_t	EMU_IntGetEnabled (void)
	Get enabled and pending EMU interrupt flags. Useful for handling more interrupt sources in the same interrupt handler.

__STATIC_INLINE void	EMU_IntSet (uint32_t flags)
	Set one or more pending EMU interrupts.

__STATIC_INLINE void	EMU_Lock (void)
	Lock EMU registers in order to protect them against unintended modification.

void	EMU_MemPwrDown (uint32_t blocks)
	Power down memory block.

void	EMU_PeripheralRetention ( EMU_PeripheralRetention_TypeDef periMask, bool enable)
	Set EM2 3 peripheral retention control.

__STATIC_INLINE void	EMU_PowerLock (void)
	Lock the EMU regulator control registers in order to protect against unintended modification.

__STATIC_INLINE void	EMU_PowerUnlock (void)
	Unlock the EMU power control registers so that writing to locked registers again is possible.

void	EMU_RamPowerDown (uint32_t start, uint32_t end)
	Power down RAM memory blocks.

void	EMU_RamPowerUp (void)
	Power up all available RAM memory blocks.

void	EMU_Restore (void)
	Restore CMU HF clock select state, oscillator enable, and voltage scaling (if available) after EMU_EnterEM2() or EMU_EnterEM3() are called with the restore parameter set to false. Calling this function is equivalent to calling EMU_EnterEM2() or EMU_EnterEM3() with the restore parameter set to true, but it allows the application to evaluate the wakeup reason before restoring state.

void	EMU_Save (void)
	Save the CMU HF clock select state, oscillator enable, and voltage scaling (if available) before EMU_EnterEM2() or EMU_EnterEM3() are called with the restore parameter set to false. Calling this function is equivalent to calling EMU_EnterEM2() or EMU_EnterEM3() with the restore parameter set to true, but it allows the state to be saved without going to sleep. The state can be restored manually by calling EMU_Restore() .

__STATIC_INLINE void	EMU_UnlatchPinRetention (void)
	When EM4 pin retention is set to emuPinRetentionLatch, then pins are retained through EM4 entry and wakeup. The pin state is released by calling this function. The feature allows peripherals or GPIO to be re-initialized after EM4 exit (reset), and when initialization is done, this function can release pins and return control to the peripherals or GPIO.

__STATIC_INLINE void	EMU_Unlock (void)
	Unlock the EMU so that writing to locked registers again is possible.

void	EMU_UpdateOscConfig (void)
	Update EMU module with CMU oscillator selection/enable status.

bool	EMU_VmonChannelStatusGet ( EMU_VmonChannel_TypeDef channel)
	Get the status of a voltage monitor channel.

void	EMU_VmonEnable ( EMU_VmonChannel_TypeDef channel, bool enable)
	Enable or disable a VMON channel.

void	EMU_VmonHystInit (const EMU_VmonHystInit_TypeDef *vmonInit)
	Initialize a VMON channel with hysteresis (separate rise and fall triggers).

void	EMU_VmonInit (const EMU_VmonInit_TypeDef *vmonInit)
	Initialize a VMON channel.

__STATIC_INLINE bool	EMU_VmonStatusGet (void)
	Get the status of the voltage monitor (VMON).

void	EMU_VScaleEM01 ( EMU_VScaleEM01_TypeDef voltage, bool wait)
	Force voltage scaling in EM0 and 1 to a specific voltage level.

void	EMU_VScaleEM01ByClock (uint32_t clockFrequency, bool wait)
	Voltage scale in EM0 and 1 by clock frequency.

__STATIC_INLINE EMU_VScaleEM01_TypeDef	EMU_VScaleGet (void)
	Get current voltage scaling level.

__STATIC_INLINE void	EMU_VScaleWait (void)
	Wait for voltage scaling to complete.

Macro Definition Documentation

#define EMU_DCDCINIT_DEFAULT

Value:

         { \
        
         emuPowerConfig_DcdcToDvdd,
         
          /* DCDC to DVDD. */
         
         \
        
         emuDcdcMode_LowNoise,
         
          /* Low-noise mode in EM0. */
         
         \
        
         1800,
         
          /* Nominal output voltage for DVDD mode, 1.8V. */
         
         \
        
         15,
         
          /* Nominal EM0/1 load current of less than 15mA. */
         
         \
        
         10,
         
          /* Nominal EM2/3/4 load current less than 10uA. */
         
         \
        
         200,
         
          /* Maximum average current of 200mA
         
          (assume strong battery or other power source). */
         
         \
        
         emuDcdcAnaPeripheralPower_DCDC,
         
          /* Select DCDC as analog power supply (lower power). */
         
         \
        
         160,
         
          /* Maximum reverse current of 160mA. */
         
         \
        
         emuDcdcLnCompCtrl_4u7F,
         
          /* 4.7uF DCDC capacitor. */
         
         \
        
         }

Default DCDC initialization.

Definition at line 740 of file em_emu.h .

#define EMU_EM01INIT_DEFAULT

Value:

Default initialization of EM0 and 1 configuration.

Definition at line 502 of file em_emu.h .

Referenced by BSP_initEmu() .

#define EMU_EM23INIT_DEFAULT

Value:

         { \
        
         false,
         
          /* Reduced voltage regulator drive strength in EM2/3.*/
         
         \
        
         emuVScaleEM23_FastWakeup,
         
          /* Do not scale down in EM2/3. */
         
         \
        
         }

Default initialization of EM2 and 3 configuration.

Definition at line 518 of file em_emu.h .

Referenced by BSP_initEmu() .

#define EMU_EM4INIT_DEFAULT

Value:

         { \
        
         false,
         
          /* Retain LFXO configuration upon EM4 entry. */
         
         \
        
         false,
         
          /* Retain LFRCO configuration upon EM4 entry. */
         
         \
        
         false,
         
          /* Retain ULFRCO configuration upon EM4 entry. */
         
         \
        
         emuEM4Shutoff,
         
          /* Use EM4 shutoff state. */
         
         \
        
         emuPinRetentionDisable,
         
          /* Do not retain pins in EM4. */
         
         \
        
         emuVScaleEM4H_FastWakeup,
         
          /* Do not scale down in EM4H. */
         
         \
        
         }

Default initialization of EM4 configuration (Series 1 with VSCALE).

Definition at line 567 of file em_emu.h .

Referenced by UTIL_shutdown() .

#define EMU_VMONHYSTINIT_DEFAULT

Value:

         { \
        
         emuVmonChannel_AVDD,
         
          /* AVDD VMON channel. */
         
         \
        
         3200,
         
          /* 3.2 V rise threshold. */
         
         \
        
         3200,
         
          /* 3.2 V fall threshold. */
         
         \
        
         false,
         
          /* Do not wake from EM4H on rising edge. */
         
         \
        
         false,
         
          /* Do not wake from EM4H on falling edge. */
         
         \
        
         true
         
          /* Enable VMON channel. */
         
         \
        
         }

Default VMON Hysteresis initialization structure.

Definition at line 790 of file em_emu.h .

#define EMU_VMONINIT_DEFAULT

Value:

         { \
        
         emuVmonChannel_AVDD,
         
          /* AVDD VMON channel. */
         
         \
        
         3200,
         
          /* 3.2 V threshold. */
         
         \
        
         false,
         
          /* Do not wake from EM4H on rising edge. */
         
         \
        
         false,
         
          /* Do not wake from EM4H on falling edge. */
         
         \
        
         true,
         
          /* Enable VMON channel. */
         
         \
        
         false
         
          /* Do not disable IO0 retention */
         
         \
        
         }

Default VMON initialization structure.

Definition at line 769 of file em_emu.h .

#define emuDcdcLnFastTransient 160

Default reverse current for fast transient response mode (low noise).

Definition at line 258 of file em_emu.h .

#define emuDcdcLnHighEfficiency -1

High efficiency mode. EMU_DCDCZDETCTRL_ZDETILIMSEL is "don't care".

Definition at line 255 of file em_emu.h .

Typedef Documentation

typedef int16_t EMU_DcdcLnReverseCurrentControl_TypeDef

DCDC Forced CCM and reverse current limiter control. Positive values have unit mA.

Definition at line 252 of file em_emu.h .

Enumeration Type Documentation

enum EMU_BODMode_TypeDef

BOD threshold setting selector, active or inactive mode.

Enumerator
emuBODMode_Active	Configure BOD threshold for active mode.
emuBODMode_Inactive	Configure BOD threshold for inactive mode.

Definition at line 181 of file em_emu.h .

enum EMU_DcdcAnaPeripheralPower_TypeDef

DCDC to DVDD mode analog peripheral power supply select.

Enumerator
emuDcdcAnaPeripheralPower_AVDD	Select AVDD as analog power supply. Typically lower noise, but less energy efficient.
emuDcdcAnaPeripheralPower_DCDC	Select DCDC (DVDD) as analog power supply. Typically more energy efficient, but more noise.

Definition at line 242 of file em_emu.h .

enum EMU_DcdcConductionMode_TypeDef

DCDC conduction modes.

Enumerator
emuDcdcConductionMode_ContinuousLN	DCDC Low-Noise Continuous Conduction Mode (CCM). EFR32 interference minimization features are available in this mode.
emuDcdcConductionMode_DiscontinuousLN	DCDC Low-Noise Discontinuous Conduction Mode (DCM). This mode should be used for EFM32 or for EFR32 when its radio is not enabled.

Definition at line 230 of file em_emu.h .

enum EMU_DcdcLnCompCtrl_TypeDef

DCDC Low Noise Compensator Control register.

Enumerator
emuDcdcLnCompCtrl_1u0F	DCDC capacitor is 1uF.
emuDcdcLnCompCtrl_4u7F	DCDC capacitor is 4.7uF.

Definition at line 297 of file em_emu.h .

enum EMU_DcdcLnRcoBand_TypeDef

DCDC Low-noise RCO band select.

Enumerator
emuDcdcLnRcoBand_3MHz	Set RCO to 3MHz.
emuDcdcLnRcoBand_4MHz	Set RCO to 4MHz.
emuDcdcLnRcoBand_5MHz	Set RCO to 5MHz.
emuDcdcLnRcoBand_6MHz	Set RCO to 6MHz.
emuDcdcLnRcoBand_7MHz	Set RCO to 7MHz.
emuDcdcLnRcoBand_8MHz	Set RCO to 8MHz.
emuDcdcLnRcoBand_9MHz	Set RCO to 9MHz.
emuDcdcLnRcoBand_10MHz	Set RCO to 10MHz.

Definition at line 263 of file em_emu.h .

enum EMU_DcdcMode_TypeDef

DCDC operating modes.

Enumerator
emuDcdcMode_Bypass	DCDC regulator bypass.
emuDcdcMode_LowNoise	DCDC low-noise mode.
emuDcdcMode_LowPower	DCDC low-power mode.

Definition at line 216 of file em_emu.h .

enum EMU_EM4PinRetention_TypeDef

Enumerator
emuPinRetentionDisable	No Retention: Pads enter reset state when entering EM4.
emuPinRetentionEm4Exit	Retention through EM4: Pads enter reset state when exiting EM4.
emuPinRetentionLatch	Retention through EM4 and wakeup: call EMU_UnlatchPinRetention() to release pins from retention after EM4 wakeup.

Definition at line 197 of file em_emu.h .

enum EMU_EM4State_TypeDef

EM4 modes.

Enumerator
emuEM4Shutoff	EM4 Shutoff.
emuEM4Hibernate	EM4 Hibernate.

Definition at line 189 of file em_emu.h .

enum EMU_PeripheralRetention_TypeDef

Peripheral EM2 and 3 retention control.

Definition at line 370 of file em_emu.h .

enum EMU_PowerConfig_TypeDef

Power configurations. DCDC-to-DVDD is currently the only supported mode.

Enumerator
emuPowerConfig_DcdcToDvdd	DCDC is connected to DVDD.

Definition at line 209 of file em_emu.h .

enum EMU_VmonChannel_TypeDef

VMON channels.

Definition at line 307 of file em_emu.h .

enum EMU_VScaleEM01_TypeDef

Supported EM0/1 Voltage Scaling Levels.

Enumerator
emuVScaleEM01_HighPerformance	High-performance voltage level. HF clock can be set to any frequency.
emuVScaleEM01_LowPower	Low-power optimized voltage level. HF clock must be limited to CMU_VSCALEEM01_LOWPOWER_VOLTAGE_CLOCK_MAX Hz at this voltage. EM0/1 voltage scaling is applied when core clock frequency is changed from CMU or when calling EMU_EM01Init() when HF clock is already below the limit.

Definition at line 332 of file em_emu.h .

enum EMU_VScaleEM23_TypeDef

Supported EM2/3 Voltage Scaling Levels.

Enumerator
emuVScaleEM23_FastWakeup	Fast-wakeup voltage level.
emuVScaleEM23_LowPower	Low-power optimized voltage level. Using this voltage level in EM2 and 3 adds approximately 30 us to wakeup time if EM0 and 1 voltage must be scaled up to emuVScaleEM01_HighPerformance on EM2 or 3 exit.

Definition at line 346 of file em_emu.h .

enum EMU_VScaleEM4H_TypeDef

Supported EM4H Voltage Scaling Levels

Enumerator
emuVScaleEM4H_FastWakeup	Fast-wakeup voltage level.
emuVScaleEM4H_LowPower	Low-power optimized voltage level. Using this voltage level in EM4H adds approximately 30 us to wakeup time if EM0 and 1 voltage must be scaled up to emuVScaleEM01_HighPerformance on EM4H exit.

Definition at line 358 of file em_emu.h .

Function Documentation

void EMU_EM01Init ( const EMU_EM01Init_TypeDef * em01Init )

Update the EMU module with Energy Mode 0 and 1 configuration.

Parameters

[in] em01Init Energy Mode 0 and 1 configuration structure.

Definition at line 1222 of file em_emu.c .

References EMU_VScaleEM01ByClock() , and EMU_EM01Init_TypeDef::vScaleEM01LowPowerVoltageEnable .

Referenced by BSP_initEmu() .

void EMU_EM23Init ( const EMU_EM23Init_TypeDef * em23Init )

Update the EMU module with Energy Mode 2 and 3 configuration.

Parameters

[in] em23Init Energy Mode 2 and 3 configuration structure.

Definition at line 1237 of file em_emu.c .

References _EMU_CTRL_EM23VSCALE_MASK , _EMU_CTRL_EM23VSCALE_SHIFT , CMU , CMU_HFXOCTRL_AUTOSTARTSELEM0EM1 , EMU_EM23Init_TypeDef::em23VregFullEn , EMU , emuVScaleEM23_LowPower , and EMU_EM23Init_TypeDef::vScaleEM23Voltage .

Referenced by BSP_initEmu() .

void EMU_EM4Init ( const EMU_EM4Init_TypeDef * em4Init )

Update the EMU module with Energy Mode 4 configuration.

Parameters

[in] em4Init Energy Mode 4 configuration structure.

Definition at line 1267 of file em_emu.c .

References _EMU_CTRL_EM4HVSCALE_MASK , _EMU_CTRL_EM4HVSCALE_SHIFT , _EMU_EM4CTRL_EM4IORETMODE_MASK , _EMU_EM4CTRL_EM4STATE_MASK , _EMU_EM4CTRL_RETAINLFRCO_MASK , _EMU_EM4CTRL_RETAINLFXO_MASK , _EMU_EM4CTRL_RETAINULFRCO_MASK , EMU_EM4Init_TypeDef::em4State , EMU , EMU_EM4CTRL_EM4STATE_EM4H , EMU_EM4CTRL_RETAINLFRCO , EMU_EM4CTRL_RETAINLFXO , EMU_EM4CTRL_RETAINULFRCO , emuEM4Hibernate , EMU_EM4Init_TypeDef::pinRetentionMode , EMU_EM4Init_TypeDef::retainLfrco , EMU_EM4Init_TypeDef::retainLfxo , EMU_EM4Init_TypeDef::retainUlfrco , and EMU_EM4Init_TypeDef::vScaleEM4HVoltage .

Referenced by UTIL_shutdown() .

void EMU_EnterEM2 ( bool restore )

Enter energy mode 2 (EM2).

When entering EM2, high-frequency clocks are disabled, i.e., HFXO, HFRCO and AUXHFRCO (for AUXHFRCO, see exception note below). When re-entering EM0, HFRCO is re-enabled and the core will be clocked by the configured HFRCO band. This ensures a quick wakeup from EM2.

However, prior to entering EM2, the core may have been using another oscillator than HFRCO. The restore parameter gives the user the option to restore all HF oscillators according to state prior to entering EM2, as well as the clock used to clock the core. This restore procedure is handled by SW. However, since handled by SW, it will not be restored before completing the interrupt function(s) waking up the core!

Note: If restoring core clock to use the HFXO oscillator, which has been disabled during EM2 mode, this function will stall until the oscillator has stabilized. Stalling time can be reduced by adding interrupt support detecting stable oscillator, and an asynchronous switch to the original oscillator. See CMU documentation. Such a feature is however outside the scope of the implementation in this function.; If ERRATA_FIX_EMU_E110_ENABLE is active, the core's SLEEPONEXIT feature can not be used.

: If HFXO is re-enabled by this function, and NOT used to clock the core, this function will not wait for HFXO to stabilize. This must be considered by the application if trying to use features relying on that oscillator upon return.

: If a debugger is attached, the AUXHFRCO will not be disabled if enabled upon entering EM2. It will thus remain enabled when returning to EM0 regardless of the restore parameter.

: If HFXO autostart and select is enabled by using CMU_HFXOAutostartEnable() , the starting and selecting of the core clocks will be identical to the user independently of the value of the restore parameter when waking up on the wakeup sources corresponding to the autostart and select setting.

: If voltage scaling is supported, the restore parameter is true and the EM0 voltage scaling level is set higher than the EM2 level, then the EM0 level is also restored.

Note that the hardware will automatically update the HFRCO frequency in the case where voltage scaling is used in EM2/EM3 and not in EM0/EM1. When the restore argument to this function is true then software will restore the original HFRCO frequency after EM2/EM3 wake up. If the restore argument is false then the HFRCO frequency is 19 MHz when coming out of EM2/EM3 and all wait states are at a safe value.

Parameters

[in]


              restore

true - save and restore oscillators, clocks and voltage scaling, see function details.
false - do not save and restore oscillators and clocks, see function details.

: The restore option should only be used if all clock control is done via the CMU API.

Definition at line 557 of file em_emu.c .

References CORE_CRITICAL_SECTION , and SystemCoreClockUpdate() .

Referenced by CAPLESENSE_Sleep() , UTIL_sleep() , and UTIL_waitForEvent() .

void EMU_EnterEM3 ( bool restore )

Enter energy mode 3 (EM3).

When entering EM3, the high-frequency clocks are disabled by hardware, i.e., HFXO, HFRCO, and AUXHFRCO (for AUXHFRCO, see exception note below). In addition, the low-frequency clocks, i.e., LFXO and LFRCO are disabled by software. When re-entering EM0, HFRCO is re-enabled and the core will be clocked by the configured HFRCO band. This ensures a quick wakeup from EM3.

However, prior to entering EM3, the core may have been using an oscillator other than HFRCO. The restore parameter gives the user the option to restore all HF/LF oscillators according to state prior to entering EM3, as well as the clock used to clock the core. This restore procedure is handled by software. However, since it is handled by software, it will not be restored before completing the interrupt function(s) waking up the core!

Note: If restoring core clock to use an oscillator other than HFRCO, this function will stall until the oscillator has stabilized. Stalling time can be reduced by adding interrupt support detecting stable oscillator, and an asynchronous switch to the original oscillator. See CMU documentation. This feature is, however, outside the scope of the implementation in this function.; If ERRATA_FIX_EMU_E110_ENABLE is active, the core's SLEEPONEXIT feature can't be used.

: If HFXO/LFXO/LFRCO are re-enabled by this function, and NOT used to clock the core, this function will not wait for those oscillators to stabilize. This must be considered by the application if trying to use features relying on those oscillators upon return.

: If a debugger is attached, the AUXHFRCO will not be disabled if enabled upon entering EM3. It will, therefore, remain enabled when returning to EM0 regardless of the restore parameter.

: If voltage scaling is supported, the restore parameter is true and the EM0 voltage scaling level is set higher than the EM3 level, then the EM0 level is also restored.

Parameters

[in]


              restore

true - save and restore oscillators, clocks and voltage scaling, see function details.
false - do not save and restore oscillators and clocks, see function details.

: The restore option should only be used if all clock control is done via the CMU API.

Definition at line 682 of file em_emu.c .

References CMU , CMU_Lock() , CMU_LOCK_LOCKKEY_LOCKED , CMU_OSCENCMD_LFRCODIS , CMU_OSCENCMD_LFXODIS , CMU_Unlock() , CORE_CRITICAL_SECTION , and SystemCoreClockUpdate() .

void EMU_EnterEM4 ( void )

Enter energy mode 4 (EM4).

Note: Only a power on reset or external reset pin can wake the device from EM4.

Definition at line 812 of file em_emu.c .

References _CMU_HFRCOCTRL_CLKDIV_MASK , _EMU_DCDCCTRL_DCDCMODE_MASK , _EMU_EM4CTRL_EM4ENTRY_MASK , _EMU_EM4CTRL_EM4ENTRY_SHIFT , _EMU_EM4CTRL_EM4STATE_MASK , _EMU_PWRCTRL_ANASW_MASK , BUS_RegMaskedClear() , CMU , CMU_HFCLKSEL_HF_HFRCO , CMU_HFRCOCTRL_CLKDIV_DIV4 , CMU_OSCENCMD_HFRCOEN , CMU_STATUS_HFRCORDY , CMU_SYNCBUSY_HFRCOBSY , DEVINFO , EMU , EMU_BASE , EMU_DCDCCTRL_DCDCMODE_LOWNOISE , EMU_DCDCCTRL_DCDCMODE_LOWPOWER , EMU_EM4CTRL_EM4STATE_EM4H , EMU_EM4CTRL_EM4STATE_EM4S , EMU_PWRCTRL_ANASW_DVDD , EMU_Unlock() , and emuDcdcMode_Bypass .

Referenced by EMU_EnterEM4H() , EMU_EnterEM4S() , and UTIL_shutdown() .

void EMU_EnterEM4H ( void )

Enter energy mode 4 hibernate (EM4H).

Note: Retention of clocks and GPIO in EM4 can be configured using EMU_EM4Init before calling this function.

Definition at line 912 of file em_emu.c .

References _EMU_EM4CTRL_EM4STATE_SHIFT , BUS_RegBitWrite() , EMU , and EMU_EnterEM4() .

void EMU_EnterEM4S ( void )

Enter energy mode 4 shutoff (EM4S).

Note: Retention of clocks and GPIO in EM4 can be configured using EMU_EM4Init before calling this function.

Definition at line 928 of file em_emu.c .

References _EMU_EM4CTRL_EM4STATE_SHIFT , BUS_RegBitWrite() , EMU , and EMU_EnterEM4() .

__STATIC_INLINE void EMU_IntClear ( uint32_t flags )

Clear one or more pending EMU interrupts.

Parameters

[in] flags Pending EMU interrupt sources to clear. Use one or more valid interrupt flags for the EMU module (EMU_IFC_nnn).

Definition at line 944 of file em_emu.h .

References EMU .

Referenced by disableInterrupts() , and TEMPDRV_IRQHandler() .

__STATIC_INLINE void EMU_IntDisable ( uint32_t flags )

Disable one or more EMU interrupts.

Parameters

[in] flags EMU interrupt sources to disable. Use one or more valid interrupt flags for the EMU module (EMU_IEN_nnn).

Definition at line 961 of file em_emu.h .

References EMU .

Referenced by disableInterrupts() , and updateInterrupts() .

__STATIC_INLINE void EMU_IntEnable ( uint32_t flags )

Enable one or more EMU 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 EMU_IntClear() prior to enabling the interrupt.

Parameters

[in] flags EMU interrupt sources to enable. Use one or more valid interrupt flags for the EMU module (EMU_IEN_nnn).

Definition at line 983 of file em_emu.h .

References EMU .

Referenced by updateInterrupts() .

__STATIC_INLINE uint32_t EMU_IntGet ( void )

Get pending EMU interrupt flags.

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

Returns: EMU interrupt sources pending. Returns one or more valid interrupt flags for the EMU module (EMU_IF_nnn).

Definition at line 1003 of file em_emu.h .

References EMU .

__STATIC_INLINE uint32_t EMU_IntGetEnabled ( void )

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

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

Returns

Pending and enabled EMU interrupt sources Return value is the bitwise AND of

the enabled interrupt sources in EMU_IEN and
the pending interrupt flags EMU_IF.

Definition at line 1022 of file em_emu.h .

References EMU .

Referenced by TEMPDRV_IRQHandler() .

__STATIC_INLINE void EMU_IntSet ( uint32_t flags )

Set one or more pending EMU interrupts.

Parameters

[in] flags EMU interrupt sources to set to pending. Use one or more valid interrupt flags for the EMU module (EMU_IFS_nnn).

Definition at line 1038 of file em_emu.h .

References EMU .

__STATIC_INLINE void EMU_Lock ( void )

Lock EMU registers in order to protect them against unintended modification.

Note: If locking EMU registers, they must be unlocked prior to using any EMU API functions modifying EMU registers, excluding interrupt control and regulator control if the architecture has a EMU_PWRCTRL register. An exception to this is the energy mode entering API (EMU_EnterEMn()), which can be used when the EMU registers are locked.

Definition at line 1098 of file em_emu.h .

References EMU .

Referenced by RMU_ResetCauseClear() .

void EMU_MemPwrDown ( uint32_t blocks )

Power down memory block.

Parameters

[in] blocks Specifies a logical OR of bits indicating memory blocks to power down. Bit 0 selects block 1, bit 1 selects block 2, and so on. Memory block 0 cannot be disabled. See the reference manual for available memory blocks for a device.

Note: Only a POR reset can power up the specified memory block(s) after power down.

Deprecated:: This function is deprecated, use EMU_RamPowerDown() instead which maps a user provided memory range into RAM blocks to power down.

Definition at line 954 of file em_emu.c .

References _EMU_RAM0CTRL_MASK , and EMU .

void EMU_PeripheralRetention	(	EMU_PeripheralRetention_TypeDef	`periMask,`
		bool	`enable`
	)

Set EM2 3 peripheral retention control.

Parameters

[in]	`periMask`	A peripheral select mask. Use \| operator to select multiple peripherals, for example emuPeripheralRetention_LEUART0 \| emuPeripheralRetention_VDAC0.
[in]	`enable`	Peripheral retention enable (true) or disable (false).

Note: Only peripheral retention disable is currently supported. Peripherals are enabled by default and can only be disabled.

Definition at line 1103 of file em_emu.c .

References EMU .

void EMU_RamPowerDown	(	uint32_t	`start,`
		uint32_t	`end`
	)

Power down RAM memory blocks.

This function will power down all the RAM blocks that are within a given range. The RAM block layout is different between device families, so this function can be used in a generic way to power down a RAM memory region which is known to be unused.

This function will only power down blocks which are completely enclosed by the memory range given by [start, end).

This is an example to power down all RAM blocks except the first one. The first RAM block is special in that it cannot be powered down by the hardware. The size of the first RAM block is device-specific. See the reference manual to find the RAM block sizes.

1 EMU_RamPowerDown(SRAM_BASE, SRAM_BASE + SRAM_SIZE);

Note: Only a reset can power up the specified memory block(s) after power down on a series 0 device.

Parameters

[in]	`start`	The start address of the RAM region to power down. This address is inclusive.
[in]	`end`	The end address of the RAM region to power down. This address is exclusive. If this parameter is 0, all RAM blocks contained in the region from start to the upper RAM address will be powered down.

Definition at line 1000 of file em_emu.c .

References EMU , RAM1_MEM_BASE , RAM1_MEM_END , RAM2_MEM_BASE , RAM2_MEM_END , RAM_MEM_BASE , SRAM_BASE , and SRAM_SIZE .

void EMU_RamPowerUp ( void )

Power up all available RAM memory blocks.

This function will power up all the RAM blocks on a device, this means that the RAM blocks are retained in EM2/EM3. Note that this functionality is not supported on Series 0 devices. Only a reset will power up the RAM blocks on a series 0 device.

Definition at line 1074 of file em_emu.c .

References EMU .

void EMU_UpdateOscConfig ( void )

Update EMU module with CMU oscillator selection/enable status.

Deprecated:: Oscillator status is saved in EMU_EnterEM2() and EMU_EnterEM3() .

Definition at line 1118 of file em_emu.c .

bool EMU_VmonChannelStatusGet ( EMU_VmonChannel_TypeDef channel )

Get the status of a voltage monitor channel.

Parameters

[in] channel A VMON channel to get the status for.

Returns: A status of the selected VMON channel. True if the channel is triggered.

Definition at line 2871 of file em_emu.c .

References _EMU_STATUS_VMONALTAVDD_SHIFT , _EMU_STATUS_VMONAVDD_SHIFT , _EMU_STATUS_VMONDVDD_SHIFT , _EMU_STATUS_VMONIO0_SHIFT , BUS_RegBitRead() , and EMU .

void EMU_VmonEnable	(	EMU_VmonChannel_TypeDef	`channel,`
		bool	`enable`
	)

Enable or disable a VMON channel.

Parameters

[in]	`channel`	A VMON channel to enable/disable.
[in]	`enable`	Indicates whether to enable or disable.

Definition at line 2819 of file em_emu.c .

References _EMU_VMONALTAVDDCTRL_EN_SHIFT , _EMU_VMONAVDDCTRL_EN_SHIFT , _EMU_VMONDVDDCTRL_EN_SHIFT , _EMU_VMONIO0CTRL_EN_SHIFT , BUS_RegBitWrite() , and EMU .

void EMU_VmonHystInit ( const EMU_VmonHystInit_TypeDef * vmonInit )

Initialize a VMON channel with hysteresis (separate rise and fall triggers).

Initialize a VMON channel which supports hysteresis. The AVDD channel is the only channel to support separate rise and fall triggers. The rise and fall thresholds will be converted to a register field value based on the calibration values from the DI page.

Parameters

[in] vmonInit The VMON hysteresis initialization structure.

Definition at line 2779 of file em_emu.c .

References _EMU_VMONAVDDCTRL_FALLTHRESCOARSE_SHIFT , _EMU_VMONAVDDCTRL_FALLTHRESFINE_SHIFT , _EMU_VMONAVDDCTRL_RISETHRESCOARSE_SHIFT , _EMU_VMONAVDDCTRL_RISETHRESFINE_SHIFT , EMU_VmonHystInit_TypeDef::channel , EMU , EMU_VMONAVDDCTRL_EN , EMU_VMONAVDDCTRL_FALLWU , EMU_VMONAVDDCTRL_RISEWU , EMU_VmonHystInit_TypeDef::enable , EMU_VmonHystInit_TypeDef::fallThreshold , EMU_VmonHystInit_TypeDef::fallWakeup , EMU_VmonHystInit_TypeDef::riseThreshold , and EMU_VmonHystInit_TypeDef::riseWakeup .

void EMU_VmonInit ( const EMU_VmonInit_TypeDef * vmonInit )

Initialize a VMON channel.

Initialize a VMON channel without hysteresis. If the channel supports separate rise and fall triggers, both thresholds will be set to the same value. The threshold will be converted to a register field value based on calibration values from the DI page.

Parameters

[in] vmonInit The VMON initialization structure.

Definition at line 2692 of file em_emu.c .

References _EMU_VMONALTAVDDCTRL_THRESCOARSE_SHIFT , _EMU_VMONALTAVDDCTRL_THRESFINE_SHIFT , _EMU_VMONAVDDCTRL_FALLTHRESCOARSE_SHIFT , _EMU_VMONAVDDCTRL_FALLTHRESFINE_SHIFT , _EMU_VMONAVDDCTRL_RISETHRESCOARSE_SHIFT , _EMU_VMONAVDDCTRL_RISETHRESFINE_SHIFT , _EMU_VMONDVDDCTRL_THRESCOARSE_SHIFT , _EMU_VMONDVDDCTRL_THRESFINE_SHIFT , _EMU_VMONIO0CTRL_THRESCOARSE_SHIFT , _EMU_VMONIO0CTRL_THRESFINE_SHIFT , EMU_VmonInit_TypeDef::channel , EMU , EMU_VMONALTAVDDCTRL_EN , EMU_VMONALTAVDDCTRL_FALLWU , EMU_VMONALTAVDDCTRL_RISEWU , EMU_VMONAVDDCTRL_EN , EMU_VMONAVDDCTRL_FALLWU , EMU_VMONAVDDCTRL_RISEWU , EMU_VMONDVDDCTRL_EN , EMU_VMONDVDDCTRL_FALLWU , EMU_VMONDVDDCTRL_RISEWU , EMU_VMONIO0CTRL_EN , EMU_VMONIO0CTRL_FALLWU , EMU_VMONIO0CTRL_RETDIS , EMU_VMONIO0CTRL_RISEWU , EMU_VmonInit_TypeDef::enable , EMU_VmonInit_TypeDef::fallWakeup , EMU_VmonInit_TypeDef::retDisable , EMU_VmonInit_TypeDef::riseWakeup , and EMU_VmonInit_TypeDef::threshold .

__STATIC_INLINE bool EMU_VmonStatusGet ( void )

Get the status of the voltage monitor (VMON).

Returns: Status of the VMON. True if all the enabled channels are ready, false if one or more of the enabled channels are not ready.

Definition at line 929 of file em_emu.h .

References _EMU_STATUS_VMONRDY_SHIFT , BUS_RegBitRead() , and EMU .

void EMU_VScaleEM01	(	EMU_VScaleEM01_TypeDef	`voltage,`
		bool	`wait`
	)

Force voltage scaling in EM0 and 1 to a specific voltage level.

Parameters

[in]	`voltage`	Target VSCALE voltage level.
[in]	`wait`	Wait for scaling to complete.

Note: This function is useful for upscaling before programming Flash from MSC and downscaling after programming is done. Flash programming is only supported at emuVScaleEM01_HighPerformance .; This function ignores vScaleEM01LowPowerVoltageEnable set from EMU_EM01Init() .

Definition at line 1180 of file em_emu.c .

References _CMU_HFPRESC_PRESC_MASK , _CMU_HFPRESC_PRESC_SHIFT , CMU , EMU , EMU_VScaleGet() , EMU_VScaleWait() , emuVScaleEM01_HighPerformance , emuVScaleEM01_LowPower , and SystemHFClockGet() .

Referenced by EMU_VScaleEM01ByClock() .

void EMU_VScaleEM01ByClock	(	uint32_t	`clockFrequency,`
		bool	`wait`
	)

Voltage scale in EM0 and 1 by clock frequency.

Parameters

[in]	`clockFrequency`	Use CMSIS HF clock if 0 or override to custom clock. Providing a custom clock frequency is required if using a non-standard HFXO frequency.
[in]	`wait`	Wait for scaling to complete.