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_EM23Init_TypeDef
	EM2 and 3 initialization structure.

struct	EMU_EM4Init_TypeDef
	EM4 initialization structure.

struct	EMU_DCDCInit_TypeDef
	DCDC initialization structure.

struct	EMU_VmonInit_TypeDef
	VMON initialization structure.

struct	EMU_VmonHystInit_TypeDef
	VMON Hysteresis initialization structure.

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

void	EMU_EM23PresleepHook (void)
	Energy mode 2/3 pre-sleep hook function.

void	EMU_EM23PostsleepHook (void)
	Energy mode 2/3 post-sleep hook function.

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

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

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

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.

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.

void	EMU_EM4PresleepHook (void)
	Energy mode 4 pre-sleep hook function.

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).

void	EMU_MemPwrDown (uint32_t blocks)
	Power down memory block.

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

void	EMU_EFPEM23PresleepHook (void)
	EFP's Energy mode 2/3 pre-sleep hook function.

void	EMU_EFPEM23PostsleepHook (void)
	EFP's Energy mode 2/3 post-sleep hook function.

void	EMU_EFPEM4PresleepHook (void)
	EFP's Energy mode 4 pre-sleep hook function.

bool	EMU_DCDCInit (const EMU_DCDCInit_TypeDef *dcdcInit)
	Configure the DCDC regulator.

void	EMU_DCDCModeSet ( EMU_DcdcMode_TypeDef dcdcMode)
	Set DCDC regulator operating mode.

void	EMU_DCDCModeEM23Set ( EMU_DcdcModeEM23_TypeDef dcdcModeEM23)
	Set DCDC Mode EM23 operating mode.

bool	EMU_DCDCPowerOff (void)
	Power off the DCDC regulator.

void	EMU_DCDCConductionModeSet ( EMU_DcdcConductionMode_TypeDef conductionMode, bool rcoDefaultSet)
	Set DCDC LN regulator conduction mode.

bool	EMU_DCDCOutputVoltageSet (uint32_t mV, bool setLpVoltage, bool setLnVoltage)
	Set the DCDC output voltage.

void	EMU_DCDCOptimizeSlice (uint32_t em0LoadCurrentmA)
	Optimize the DCDC slice count based on the estimated average load current in EM0.

void	EMU_DCDCLnRcoBandSet ( EMU_DcdcLnRcoBand_TypeDef band)
	Set DCDC Low-noise RCO band.

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

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

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

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

float	EMU_TemperatureGet (void)
	Get temperature in degrees Celcius.

bool	EMU_LDOStatusGet (void)
	Check status of the internal LDO regulator.

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

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

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

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

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

uint32_t	EMU_IntGet (void)
	Get pending EMU interrupt flags.

uint32_t	EMU_IntGetEnabled (void)
	Get enabled and pending EMU interrupt flags.

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

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

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

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

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

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

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

void	EMU_UnlatchPinRetention (void)
	When EM4 pin retention is set to emuPinRetentionLatch, then pins are retained through EM4 entry and wakeup.

bool	EMU_TemperatureReady (void)
	Temperature measurement ready status.

void	EMU_SetBiasMode ( EMU_BiasMode_TypeDef mode)
	Adjust the bias refresh rate.

Macros
#define	emuDcdcLnHighEfficiency -1
	High efficiency mode.

#define	emuDcdcLnFastTransient 160
	Default reverse current for fast transient response mode (low noise).

#define	EMU_EM23INIT_DEFAULT
	Default initialization of EM2 and 3 configuration.

#define	EMU_EM4INIT_DEFAULT
	Default initialization of EM4 configuration (Series 1 without VSCALE).

#define	EMU_DCDCINIT_DEFAULT
	Default DCDC initialization.

#define	EMU_VMONINIT_DEFAULT
	Default VMON initialization structure.

#define	EMU_VMONHYSTINIT_DEFAULT
	Default VMON Hysteresis initialization structure.

#define	EMU_TEMP_ZERO_C_IN_KELVIN (273.15f)
	Zero degrees Celcius in Kelvin.

#define	EMU_TEMPCO_CONST (0.273f)
	As we do not know what energy mode a temperature measurement was taken at, we choose a constant for the TEMPCO calculation that is midway between the EM0/EM1 constant and the EM2/EM3/EM4 constant.

Typedefs
typedef int16_t	EMU_DcdcLnReverseCurrentControl_TypeDef
	DCDC Forced CCM and reverse current limiter control.

Enumerations
enum	EMU_BODMode_TypeDef { emuBODMode_Active , emuBODMode_Inactive }
	BOD threshold setting selector, active or inactive mode.

enum	EMU_EM4State_TypeDef { emuEM4Shutoff = 0, emuEM4Hibernate = 1 }
	EM4 modes.

enum	EMU_EM4PinRetention_TypeDef { emuPinRetentionDisable = EMU_EM4CTRL_EM4IORETMODE_DISABLE, emuPinRetentionEm4Exit = EMU_EM4CTRL_EM4IORETMODE_EM4EXIT, emuPinRetentionLatch = EMU_EM4CTRL_EM4IORETMODE_SWUNLATCH }
	EM4 Pin Retention Type.

enum	EMU_PowerConfig_TypeDef { emuPowerConfig_DcdcToDvdd }
	Power configurations.

enum	EMU_DcdcMode_TypeDef { emuDcdcMode_Bypass = EMU_DCDCCTRL_DCDCMODE_BYPASS, emuDcdcMode_LowNoise = EMU_DCDCCTRL_DCDCMODE_LOWNOISE }
	DCDC operating modes.

enum	EMU_DcdcModeEM23_TypeDef { emuDcdcModeEM23_LowPower = EMU_DCDCCTRL_DCDCMODEEM23_EM23LOWPOWER, emuDcdcModeEM23_Sw = EMU_DCDCCTRL_DCDCMODEEM23_EM23SW }
	DCDC operating modes in EM2 or EM3.

enum	EMU_DcdcConductionMode_TypeDef { emuDcdcConductionMode_ContinuousLN , emuDcdcConductionMode_DiscontinuousLN }
	DCDC conduction modes.

enum	EMU_DcdcAnaPeripheralPower_TypeDef { emuDcdcAnaPeripheralPower_AVDD = EMU_PWRCTRL_ANASW_AVDD, emuDcdcAnaPeripheralPower_DCDC = EMU_PWRCTRL_ANASW_DVDD }
	DCDC to DVDD mode analog peripheral power supply select.

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 }
	DCDC Low-noise RCO band select.

enum	EMU_DcdcLnCompCtrl_TypeDef { emuDcdcLnCompCtrl_1u0F , emuDcdcLnCompCtrl_4u7F }
	DCDC Low Noise Compensator Control register.

enum	EMU_VmonChannel_TypeDef { emuVmonChannel_AVDD , emuVmonChannel_ALTAVDD , emuVmonChannel_DVDD , emuVmonChannel_IOVDD0 }
	VMON channels.

enum	EMU_BiasMode_TypeDef { emuBiasMode_1KHz , emuBiasMode_4KHz , emuBiasMode_Continuous }
	Bias mode configurations.

Function Documentation

◆ EMU_EM23Init()

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.

◆ EMU_EM23PresleepHook()

void EMU_EM23PresleepHook ( void )

Energy mode 2/3 pre-sleep hook function.

This function is called by EMU_EnterEM2() and EMU_EnterEM3() functions just prior to execution of the WFI instruction. The function implementation does not perform anything, but it is SL_WEAK so that it can be re- implemented in application code if actions are needed.

◆ EMU_EM23PostsleepHook()

void EMU_EM23PostsleepHook ( void )

Energy mode 2/3 post-sleep hook function.

This function is called by EMU_EnterEM2() and EMU_EnterEM3() functions just after wakeup from the WFI instruction. The function implementation does not perform anything, but it is SL_WEAK so that it can be re- implemented in application code if actions are needed.

◆ EMU_EM4Init()

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.

◆ EMU_EnterEM2()

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 automatic starting and selecting of the core clocks will be done, regardless 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.

: On Series 2 Config 2 devices (EFRxG22), this function will also relock the DPLL if the DPLL is used and restore is true.

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.

◆ EMU_EnterEM3()

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.

: On Series 2 Config 2 devices (EFRxG22), this function will also relock the DPLL if the DPLL is used and restore is true.

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.

◆ EMU_Save()

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() .

◆ EMU_Restore()

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.

◆ EMU_EM4PresleepHook()

void EMU_EM4PresleepHook ( void )

Energy mode 4 pre-sleep hook function.

This function is called by EMU_EnterEM4() just prior to the sequence of writes to put the device in EM4. The function implementation does not perform anything, but it is SL_WEAK so that it can be re-implemented in application code if actions are needed.

◆ EMU_EnterEM4()

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.

◆ EMU_EnterEM4H()

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.

◆ EMU_EnterEM4S()

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.

◆ EMU_MemPwrDown()

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.

◆ EMU_RamPowerDown()

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.

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. The specified memory block(s) will stay off until a call to EMU_RamPowerUp() is done on series 1/2.

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.

◆ EMU_RamPowerUp()

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.

◆ EMU_UpdateOscConfig()

void EMU_UpdateOscConfig ( void )

Update EMU module with CMU oscillator selection/enable status.

◆ EMU_EFPEM23PresleepHook()

void EMU_EFPEM23PresleepHook ( void )

EFP's Energy mode 2/3 pre-sleep hook function.

This function is similar to EMU_EM23PresleepHook() but is reserved for EFP usage.

Note: The function is primarily meant to be used in systems with EFP circuitry. (EFP = Energy Friendly Pmic (PMIC = Power Management IC)). In such systems there is a need to drive certain signals to EFP pins to notify about energy mode transitions.

◆ EMU_EFPEM23PostsleepHook()

void EMU_EFPEM23PostsleepHook ( void )

EFP's Energy mode 2/3 post-sleep hook function.

This function is similar to EMU_EM23PostsleepHook() but is reserved for EFP usage.

Note: The function is primarily meant to be used in systems with EFP circuitry. (EFP = Energy Friendly Pmic (PMIC = Power Management IC)). In such systems there is a need to drive certain signals to EFP pins to notify about energy mode transitions.

◆ EMU_EFPEM4PresleepHook()

void EMU_EFPEM4PresleepHook ( void )

EFP's Energy mode 4 pre-sleep hook function.

This function is similar to EMU_EM4PresleepHook() but is reserved for EFP usage.

Note: The function is primarily meant to be used in systems with EFP circuitry. (EFP = Energy Friendly Pmic (PMIC = Power Management IC)). In such systems there is a need to drive certain signals to EFP pins to notify about energy mode transitions.

◆ EMU_DCDCInit()

bool EMU_DCDCInit ( const EMU_DCDCInit_TypeDef * dcdcInit )

Configure the DCDC regulator.

Note: Do not call this function if the power circuit is configured for NODCDC as described in the Power Configurations section of the Reference Manual. Instead, call EMU_DCDCPowerOff() .

Parameters

[in] dcdcInit The DCDC initialization structure.

Returns: True if initialization parameters are valid.

◆ EMU_DCDCModeSet()

void EMU_DCDCModeSet ( EMU_DcdcMode_TypeDef dcdcMode )

Set DCDC regulator operating mode.

Parameters

[in] dcdcMode DCDC mode.

◆ EMU_DCDCModeEM23Set()

void EMU_DCDCModeEM23Set ( EMU_DcdcModeEM23_TypeDef dcdcModeEM23 )

Set DCDC Mode EM23 operating mode.

Parameters

[in] dcdcModeEM23 DCDC mode EM23.

◆ EMU_DCDCPowerOff()

bool EMU_DCDCPowerOff ( void )

Power off the DCDC regulator.

This function powers off the DCDC controller. This function should only be used if the external power circuit is wired for no DCDC. If the external power circuit is wired for DCDC usage, use EMU_DCDCInit() and set the DCDC in bypass mode to disable DCDC.

Returns: Return false if the DCDC could not be disabled.

◆ EMU_DCDCConductionModeSet()

void EMU_DCDCConductionModeSet	(	EMU_DcdcConductionMode_TypeDef	`conductionMode,`
		bool	`rcoDefaultSet`
	)

Set DCDC LN regulator conduction mode.

Parameters

[in]	`conductionMode`	DCDC LN conduction mode.
[in]	`rcoDefaultSet`	The default DCDC RCO band for the conductionMode will be used if true. Otherwise, the current RCO configuration is used.

◆ EMU_DCDCOutputVoltageSet()

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

Set the DCDC output voltage.

Note: The DCDC is not characterized for the entire valid output voltage range. For that reason an upper limit of 3.0V output voltage is enforced.

Parameters

[in]	`mV`	Target DCDC output voltage in mV.
[in]	`setLpVoltage`	Update LP voltage
[in]	`setLnVoltage`	Update LN voltage

Returns: True if the mV parameter is valid.

◆ EMU_DCDCOptimizeSlice()

void EMU_DCDCOptimizeSlice ( uint32_t em0LoadCurrentmA )

Optimize the DCDC slice count based on the estimated average load current in EM0.

Parameters

[in] em0LoadCurrentmA Estimated average EM0 load current in mA.

◆ EMU_DCDCLnRcoBandSet()

void EMU_DCDCLnRcoBandSet ( EMU_DcdcLnRcoBand_TypeDef band )

Set DCDC Low-noise RCO band.

Parameters

[in] band RCO band to set.

◆ EMU_VmonInit()

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.

◆ EMU_VmonHystInit()

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.

◆ EMU_VmonEnable()

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.

◆ EMU_VmonChannelStatusGet()

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.

◆ EMU_TemperatureGet()

float EMU_TemperatureGet ( void )

Get temperature in degrees Celcius.

Returns: Temperature in degrees Celcius

◆ EMU_LDOStatusGet()

bool EMU_LDOStatusGet ( void )

inline

Check status of the internal LDO regulator.

Returns: Return true if the regulator is on, false if regulator is off.

◆ EMU_EnterEM1()

void EMU_EnterEM1 ( void )

inline

Enter energy mode 1 (EM1).

◆ EMU_VmonStatusGet()

bool EMU_VmonStatusGet ( void )

inline

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.

◆ EMU_IntClear()

void EMU_IntClear ( uint32_t flags )

inline

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).

◆ EMU_IntDisable()

void EMU_IntDisable ( uint32_t flags )

inline

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).

◆ EMU_IntEnable()

void EMU_IntEnable ( uint32_t flags )

inline

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).

◆ EMU_IntGet()

uint32_t EMU_IntGet ( void )

inline

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).

◆ EMU_IntGetEnabled()

uint32_t EMU_IntGetEnabled ( void )

inline

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.

◆ EMU_IntSet()

void EMU_IntSet ( uint32_t flags )

inline

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).

◆ EMU_Lock()

void EMU_Lock ( void )

inline

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.

◆ EMU_Unlock()

void EMU_Unlock ( void )

inline

Unlock the EMU so that writing to locked registers again is possible.

◆ EMU_PowerLock()

void EMU_PowerLock ( void )

inline

Lock the EMU regulator control registers in order to protect against unintended modification.

◆ EMU_PowerUnlock()

void EMU_PowerUnlock ( void )

inline

Unlock the EMU power control registers so that writing to locked registers again is possible.

◆ EMU_EM2Block()

void EMU_EM2Block ( void )

inline

Block entering EM2 or higher number energy modes.

◆ EMU_EM2UnBlock()

void EMU_EM2UnBlock ( void )

inline

Unblock entering EM2 or higher number energy modes.

◆ EMU_UnlatchPinRetention()

void EMU_UnlatchPinRetention ( void )

inline

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.

◆ EMU_TemperatureReady()

bool EMU_TemperatureReady ( void )

inline

Temperature measurement ready status.

Returns: True if temperature measurement is ready

◆ EMU_SetBiasMode()

void EMU_SetBiasMode ( EMU_BiasMode_TypeDef mode )

Adjust the bias refresh rate.

This function is only meant to be used under high-temperature operation on EFR32xG1 and EFM32xG1 devices. Adjusting the bias mode will increase the typical current consumption. See application note 1027 and errata documents for more details.

Parameters

[in] mode The new bias refresh rate.

Macro Definition Documentation

◆ emuDcdcLnHighEfficiency

#define emuDcdcLnHighEfficiency -1

High efficiency mode.

EMU_DCDCZDETCTRL_ZDETILIMSEL is "don't care".

◆ emuDcdcLnFastTransient

#define emuDcdcLnFastTransient 160

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

◆ EMU_EM23INIT_DEFAULT

#define EMU_EM23INIT_DEFAULT

Value:

         {                                                                                                             \
        
         false,
         
          /* Reduced voltage regulator drive strength in EM2/3.*/
         
         \
        
         }

Default initialization of EM2 and 3 configuration.

◆ EMU_EM4INIT_DEFAULT

#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. */
         
         \
        
         }

Default initialization of EM4 configuration (Series 1 without VSCALE).

◆ EMU_DCDCINIT_DEFAULT

#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_1u0F,
         
          /* 1uF DCDC capacitor. */
         
         \
        
         }

Default DCDC initialization.

◆ EMU_VMONINIT_DEFAULT

#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.

◆ EMU_VMONHYSTINIT_DEFAULT

#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.

◆ EMU_TEMP_ZERO_C_IN_KELVIN

#define EMU_TEMP_ZERO_C_IN_KELVIN (273.15f)

Zero degrees Celcius in Kelvin.

◆ EMU_TEMPCO_CONST

#define EMU_TEMPCO_CONST (0.273f)

As we do not know what energy mode a temperature measurement was taken at, we choose a constant for the TEMPCO calculation that is midway between the EM0/EM1 constant and the EM2/EM3/EM4 constant.

Typedef Documentation

◆ EMU_DcdcLnReverseCurrentControl_TypeDef

typedef int16_t EMU_DcdcLnReverseCurrentControl_TypeDef

DCDC Forced CCM and reverse current limiter control.

Positive values have unit mA.

Enumeration Type Documentation

◆ EMU_BODMode_TypeDef

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.

◆ EMU_EM4State_TypeDef

enum EMU_EM4State_TypeDef

EM4 modes.

Enumerator
emuEM4Shutoff	EM4 Shutoff.
emuEM4Hibernate	EM4 Hibernate.

◆ EMU_EM4PinRetention_TypeDef

enum EMU_EM4PinRetention_TypeDef

EM4 Pin Retention Type.

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.

◆ EMU_PowerConfig_TypeDef

enum EMU_PowerConfig_TypeDef

Power configurations.

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

Enumerator
emuPowerConfig_DcdcToDvdd	DCDC is connected to DVDD.

◆ EMU_DcdcMode_TypeDef

enum EMU_DcdcMode_TypeDef

DCDC operating modes.

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

◆ EMU_DcdcModeEM23_TypeDef

enum EMU_DcdcModeEM23_TypeDef

DCDC operating modes in EM2 or EM3.

Enumerator
emuDcdcModeEM23_LowPower	DCDC mode is low power.
emuDcdcModeEM23_Sw	DCDC mode is according to DCDCMODE field.

◆ EMU_DcdcConductionMode_TypeDef

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.

◆ EMU_DcdcAnaPeripheralPower_TypeDef

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.

◆ EMU_DcdcLnRcoBand_TypeDef

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.

◆ EMU_DcdcLnCompCtrl_TypeDef

enum EMU_DcdcLnCompCtrl_TypeDef

DCDC Low Noise Compensator Control register.

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

◆ EMU_VmonChannel_TypeDef

enum EMU_VmonChannel_TypeDef

VMON channels.

◆ EMU_BiasMode_TypeDef

enum EMU_BiasMode_TypeDef

Bias mode configurations.

EMU - Energy Management Unit

Description

Data Structures

Functions

Macros

Typedefs

Enumerations

Function Documentation

◆ EMU_EM23Init()

◆ EMU_EM23PresleepHook()

◆ EMU_EM23PostsleepHook()

◆ EMU_EM4Init()

◆ EMU_EnterEM2()

◆ EMU_EnterEM3()

◆ EMU_Save()

◆ EMU_Restore()

◆ EMU_EM4PresleepHook()

◆ EMU_EnterEM4()

◆ EMU_EnterEM4H()

◆ EMU_EnterEM4S()

◆ EMU_MemPwrDown()

◆ EMU_RamPowerDown()

◆ EMU_RamPowerUp()

◆ EMU_UpdateOscConfig()

◆ EMU_EFPEM23PresleepHook()

◆ EMU_EFPEM23PostsleepHook()

◆ EMU_EFPEM4PresleepHook()

◆ EMU_DCDCInit()

◆ EMU_DCDCModeSet()

◆ EMU_DCDCModeEM23Set()

◆ EMU_DCDCPowerOff()

◆ EMU_DCDCConductionModeSet()

◆ EMU_DCDCOutputVoltageSet()

◆ EMU_DCDCOptimizeSlice()

◆ EMU_DCDCLnRcoBandSet()

◆ EMU_VmonInit()

◆ EMU_VmonHystInit()

◆ EMU_VmonEnable()

◆ EMU_VmonChannelStatusGet()

◆ EMU_TemperatureGet()

◆ EMU_LDOStatusGet()

◆ EMU_EnterEM1()

◆ EMU_VmonStatusGet()

◆ EMU_IntClear()

◆ EMU_IntDisable()

◆ EMU_IntEnable()

◆ EMU_IntGet()

◆ EMU_IntGetEnabled()

◆ EMU_IntSet()

◆ EMU_Lock()

◆ EMU_Unlock()

◆ EMU_PowerLock()

◆ EMU_PowerUnlock()

◆ EMU_EM2Block()

◆ EMU_EM2UnBlock()

◆ EMU_UnlatchPinRetention()

◆ EMU_TemperatureReady()

◆ EMU_SetBiasMode()

Macro Definition Documentation

◆ emuDcdcLnHighEfficiency

◆ emuDcdcLnFastTransient

◆ EMU_EM23INIT_DEFAULT

◆ EMU_EM4INIT_DEFAULT

◆ EMU_DCDCINIT_DEFAULT

◆ EMU_VMONINIT_DEFAULT

◆ EMU_VMONHYSTINIT_DEFAULT

◆ EMU_TEMP_ZERO_C_IN_KELVIN

◆ EMU_TEMPCO_CONST

Typedef Documentation

◆ EMU_DcdcLnReverseCurrentControl_TypeDef

Enumeration Type Documentation

◆ EMU_BODMode_TypeDef

◆ EMU_EM4State_TypeDef

◆ EMU_EM4PinRetention_TypeDef

◆ EMU_PowerConfig_TypeDef

◆ EMU_DcdcMode_TypeDef

◆ EMU_DcdcModeEM23_TypeDef

◆ EMU_DcdcConductionMode_TypeDef

◆ EMU_DcdcAnaPeripheralPower_TypeDef

◆ EMU_DcdcLnRcoBand_TypeDef