EMU - Energy Management Unit#
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.
Modules#
Enumerations#
BOD threshold setting selector, active or inactive mode.
EM4 Pin Retention Type.
DCDC operating modes.
DCDC operating modes in EM2 or EM3.
DCDC conduction modes.
DCDC to DVDD mode analog peripheral power supply select.
DCDC Low-noise RCO band select.
DCDC Low Noise Compensator Control register.
VMON channels.
Supported EM0/1 Voltage Scaling Levels.
Supported EM2/3 Voltage Scaling Levels.
Supported EM4H Voltage Scaling Levels.
Peripheral EM2 and 3 retention control.
Typedefs#
DCDC Forced CCM and reverse current limiter control.
Functions#
Update the EMU module with Energy Mode 0 and 1 configuration.
Update the EMU module with Energy Mode 2 and 3 configuration.
Energy mode 2/3 pre-sleep hook function.
Energy mode 2/3 post-sleep hook function.
EFP's Energy mode 2/3 pre-sleep hook function.
EFP's Energy mode 2/3 post-sleep hook function.
Enter energy mode 2 (EM2).
Enter energy mode 3 (EM3).
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.
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.
Update the EMU module with Energy Mode 4 configuration.
Energy mode 4 pre-sleep hook function.
EFP's Energy mode 4 pre-sleep hook function.
Enter energy mode 4 (EM4).
Enter energy mode 4 (EM4).
Enter energy mode 4 hibernate (EM4H).
Enter energy mode 4 shutoff (EM4S).
Power down memory block.
Power down RAM memory blocks.
Power up all available RAM memory blocks.
Set EM2 3 peripheral retention control.
Update EMU module with CMU oscillator selection/enable status.
Voltage scale in EM0 and 1 by clock frequency.
Force voltage scaling in EM0 and 1 to a specific voltage level.
Set DCDC regulator operating mode.
Configure the DCDC regulator.
Power off the DCDC regulator.
Set DCDC Mode EM23 operating mode.
Set DCDC LN regulator conduction mode.
Set the DCDC output voltage.
Optimize the DCDC slice count based on the estimated average load current in EM0.
Set DCDC Low-noise RCO band.
Initialize a VMON channel.
Initialize a VMON channel with hysteresis (separate rise and fall triggers).
Enable or disable a VMON channel.
Get the status of a voltage monitor channel.
Get temperature in degrees Celsius.
Check status of the internal LDO regulator.
Enter energy mode 1 (EM1).
Wait for voltage scaling to complete.
Get current voltage scaling level.
Get the status of the voltage monitor (VMON).
Clear one or more pending EMU interrupts.
Disable one or more EMU interrupts.
Enable one or more EMU interrupts.
Get pending EMU interrupt flags.
Get enabled and pending EMU interrupt flags.
Set one or more pending EMU interrupts.
Lock EMU registers in order to protect them against unintended modification.
Unlock the EMU so that writing to locked registers again is possible.
Lock the EMU regulator control registers in order to protect against unintended modification.
Unlock the EMU power control registers so that writing to locked registers again is possible.
Block entering EM2 or higher number energy modes.
Unblock entering EM2 or higher number energy modes.
When EM4 pin retention is set to emuPinRetentionLatch, then pins are retained through EM4 entry and wakeup.
Temperature measurement ready status.
Load DCDC calibration constants from the DI page.
Set recommended and validated current optimization and timing settings.
Compute current limiters: LNCLIMILIMSEL: LN current limiter threshold LPCLIMILIMSEL: LP current limiter threshold DCDCZDETCTRL: zero detector limiter threshold.
Set static variables that hold the user set maximum peak current and reverse current.
Set DCDC low noise compensator control register.
Load EMU_DCDCLPCTRL_LPCMPHYSSEL depending on LP bias, LP feedback attenuation, and DEVINFOREV.
Load LPVREF low and high from DEVINFO.
Get the calibrated threshold value.
Macros#
Voltage scaling present.
Voltage scaling for EM01 present.
DC-DC buck converter present.
High efficiency mode.
Default reverse current for fast transient response mode (low noise).
Default initialization of EM0 and 1 configuration.
Default initialization of EM2 and 3 configuration.
Default initialization of EM4 configuration (Series 1 with VSCALE).
Default DCDC initialization.
Default VMON initialization structure.
Default VMON Hysteresis initialization structure.
Zero degrees Celcius in Kelvin.
Enumeration Documentation#
EMU_BODMode_TypeDef#
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#
EMU_EM4State_TypeDef
EM4 modes.
Enumerator | |
---|---|
emuEM4Shutoff | EM4 Shutoff. |
emuEM4Hibernate | EM4 Hibernate. |
EMU_EM4PinRetention_TypeDef#
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#
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#
EMU_DcdcMode_TypeDef
DCDC operating modes.
Enumerator | |
---|---|
emuDcdcMode_Bypass | DCDC regulator bypass. |
emuDcdcMode_LowNoise | DCDC low-noise mode. |
emuDcdcMode_LowPower | DCDC low-power mode. |
EMU_DcdcModeEM23_TypeDef#
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#
EMU_DcdcConductionMode_TypeDef
DCDC conduction modes.
Enumerator | |
---|---|
emuDcdcConductionMode_ContinuousLN | DCDC Low-Noise Continuous Conduction Mode (CCM). |
emuDcdcConductionMode_DiscontinuousLN | DCDC Low-Noise Discontinuous Conduction Mode (DCM). |
EMU_DcdcAnaPeripheralPower_TypeDef#
EMU_DcdcAnaPeripheralPower_TypeDef
DCDC to DVDD mode analog peripheral power supply select.
Enumerator | |
---|---|
emuDcdcAnaPeripheralPower_AVDD | Select AVDD as analog power supply. |
emuDcdcAnaPeripheralPower_DCDC | Select DCDC (DVDD) as analog power supply. |
EMU_DcdcLnRcoBand_TypeDef#
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#
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#
EMU_VmonChannel_TypeDef
VMON channels.
Enumerator | |
---|---|
emuVmonChannel_AVDD | |
emuVmonChannel_ALTAVDD | |
emuVmonChannel_DVDD | |
emuVmonChannel_IOVDD0 |
EMU_VScaleEM01_TypeDef#
EMU_VScaleEM01_TypeDef
Supported EM0/1 Voltage Scaling Levels.
Enumerator | |
---|---|
emuVScaleEM01_HighPerformance | High-performance voltage level. |
emuVScaleEM01_LowPower | Low-power optimized voltage level. |
EMU_VScaleEM23_TypeDef#
EMU_VScaleEM23_TypeDef
Supported EM2/3 Voltage Scaling Levels.
Enumerator | |
---|---|
emuVScaleEM23_FastWakeup | Fast-wakeup voltage level. |
emuVScaleEM23_LowPower | Low-power optimized voltage level. |
EMU_VScaleEM4H_TypeDef#
EMU_VScaleEM4H_TypeDef
Supported EM4H Voltage Scaling Levels.
Enumerator | |
---|---|
emuVScaleEM4H_FastWakeup | Fast-wakeup voltage level. |
emuVScaleEM4H_LowPower | Low-power optimized voltage level. |
EMU_PeripheralRetention_TypeDef#
EMU_PeripheralRetention_TypeDef
Peripheral EM2 and 3 retention control.
Enumerator | |
---|---|
emuPeripheralRetention_LEUART0 | Select LEUART0 retention control. |
emuPeripheralRetention_LESENSE0 | Select LESENSE0 retention control. |
emuPeripheralRetention_WDOG1 | Select WDOG1 retention control. |
emuPeripheralRetention_WDOG0 | Select WDOG0 retention control. |
emuPeripheralRetention_LETIMER0 | Select LETIMER0 retention control. |
emuPeripheralRetention_ADC0 | Select ADC0 retention control. |
emuPeripheralRetention_IDAC0 | Select IDAC0 retention control. |
emuPeripheralRetention_VDAC0 | Select VDAC0 retention control. |
emuPeripheralRetention_I2C0 | Select I2C0 retention control. |
emuPeripheralRetention_ACMP1 | Select ACMP1 retention control. |
emuPeripheralRetention_ACMP0 | Select ACMP0 retention control. |
emuPeripheralRetention_PCNT0 | Select PCNT0 retention control. |
emuPeripheralRetention_D1 | Select all peripherals in domain 1. |
emuPeripheralRetention_D2 | |
emuPeripheralRetention_ALL | Select all peripherals with retention control. |
Typedef Documentation#
EMU_DcdcLnReverseCurrentControl_TypeDef#
typedef int16_t EMU_DcdcLnReverseCurrentControl_TypeDef
DCDC Forced CCM and reverse current limiter control.
Positive values have unit mA.
Function Documentation#
EMU_EM01Init#
void EMU_EM01Init (const EMU_EM01Init_TypeDef * em01Init)
Update the EMU module with Energy Mode 0 and 1 configuration.
Type | Direction | Argument Name | Description |
---|---|---|---|
const EMU_EM01Init_TypeDef * | [in] | em01Init | Energy Mode 0 and 1 configuration structure. |
EMU_EM23Init#
void EMU_EM23Init (const EMU_EM23Init_TypeDef * em23Init)
Update the EMU module with Energy Mode 2 and 3 configuration.
Type | Direction | Argument Name | Description |
---|---|---|---|
const EMU_EM23Init_TypeDef * | [in] | em23Init | Energy Mode 2 and 3 configuration structure. |
EMU_EM23PresleepHook#
void EMU_EM23PresleepHook (void )
Energy mode 2/3 pre-sleep hook function.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_EFPEM23PresleepHook#
void EMU_EFPEM23PresleepHook (void )
EFP's Energy mode 2/3 pre-sleep hook function.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_EnterEM2#
void EMU_EnterEM2 (bool restore)
Enter energy mode 2 (EM2).
Type | Direction | Argument Name | Description |
---|---|---|---|
bool | [in] | restore |
|
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.
This function is incompatible with the Power Manager module. When the Power Manager module is present, it must be the one deciding at which EM level the device sleeps to ensure the application properly works. Using both at the same time could lead to undefined behavior in the application.
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.
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).
Type | Direction | Argument Name | Description |
---|---|---|---|
bool | [in] | restore |
|
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.
This function is incompatible with the Power Manager module. When the Power Manager module is present, it must be the one deciding at which EM level the device sleeps to ensure the application properly works. Using both at the same time could lead to undefined behavior in the application.
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.
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.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_EM4Init#
void EMU_EM4Init (const EMU_EM4Init_TypeDef * em4Init)
Update the EMU module with Energy Mode 4 configuration.
Type | Direction | Argument Name | Description |
---|---|---|---|
const EMU_EM4Init_TypeDef * | [in] | em4Init | Energy Mode 4 configuration structure. |
EMU_EM4PresleepHook#
void EMU_EM4PresleepHook (void )
Energy mode 4 pre-sleep hook function.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_EFPEM4PresleepHook#
void EMU_EFPEM4PresleepHook (void )
EFP's Energy mode 4 pre-sleep hook function.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_EnterEM4#
void EMU_EnterEM4 (void )
Enter energy mode 4 (EM4).
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
Note
Only a power on reset or external reset pin can wake the device from EM4.
EMU_EnterEM4Wait#
void EMU_EnterEM4Wait (void )
Enter energy mode 4 (EM4).
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
This function waits after the EM4 entry request to make sure the CPU is properly shutdown or the EM4 entry failed.
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).
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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).
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [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.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [in] | start | The start address of the RAM region to power down. This address is inclusive. |
uint32_t | [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. |
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.
EMU_RamPowerUp#
void EMU_RamPowerUp (void )
Power up all available RAM memory blocks.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_PeripheralRetention#
void EMU_PeripheralRetention (EMU_PeripheralRetention_TypeDef periMask, bool enable)
Set EM2 3 peripheral retention control.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_PeripheralRetention_TypeDef | [in] | periMask | A peripheral select mask. Use | operator to select multiple peripherals, for example emuPeripheralRetention_LEUART0 | emuPeripheralRetention_VDAC0. |
bool | [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.
EMU_UpdateOscConfig#
void EMU_UpdateOscConfig (void )
Update EMU module with CMU oscillator selection/enable status.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_VScaleEM01ByClock#
void EMU_VScaleEM01ByClock (uint32_t clockFrequency, bool wait)
Voltage scale in EM0 and 1 by clock frequency.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [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. |
bool | [in] | wait | Wait for scaling to complete. |
Note
This function is primarily needed by the CMU - Clock Management Unit.
EMU_VScaleEM01#
void EMU_VScaleEM01 (EMU_VScaleEM01_TypeDef voltage, bool wait)
Force voltage scaling in EM0 and 1 to a specific voltage level.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_VScaleEM01_TypeDef | [in] | voltage | Target VSCALE voltage level. |
bool | [in] | wait | Wait for scaling to complete. |
Note
This function is useful for upscaling before programming Flash from MSC - Memory System Controller and downscaling after programming is done. Flash programming is only supported at emuVScaleEM01_HighPerformance.
This function ignores vScaleEM01LowPowerVoltageEnable set from EMU_EM01Init().
EMU_DCDCModeSet#
void EMU_DCDCModeSet (EMU_DcdcMode_TypeDef dcdcMode)
Set DCDC regulator operating mode.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_DcdcMode_TypeDef | [in] | dcdcMode | DCDC mode. |
EMU_DCDCInit#
bool EMU_DCDCInit (const EMU_DCDCInit_TypeDef * dcdcInit)
Configure the DCDC regulator.
Type | Direction | Argument Name | Description |
---|---|---|---|
const EMU_DCDCInit_TypeDef * | [in] | dcdcInit | The DCDC initialization structure. |
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().
Returns
True if initialization parameters are valid.
EMU_DCDCPowerOff#
bool EMU_DCDCPowerOff (void )
Power off the DCDC regulator.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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_DCDCModeEM23Set#
void EMU_DCDCModeEM23Set (EMU_DcdcModeEM23_TypeDef dcdcModeEM23)
Set DCDC Mode EM23 operating mode.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_DcdcModeEM23_TypeDef | [in] | dcdcModeEM23 | DCDC mode EM23. |
EMU_DCDCConductionModeSet#
void EMU_DCDCConductionModeSet (EMU_DcdcConductionMode_TypeDef conductionMode, bool rcoDefaultSet)
Set DCDC LN regulator conduction mode.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_DcdcConductionMode_TypeDef | [in] | conductionMode | DCDC LN conduction mode. |
bool | [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.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [in] | mV | Target DCDC output voltage in mV. |
bool | [in] | setLpVoltage | Update LP voltage |
bool | [in] | setLnVoltage | Update LN 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.
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.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [in] | em0LoadCurrentmA | Estimated average EM0 load current in mA. |
EMU_DCDCLnRcoBandSet#
void EMU_DCDCLnRcoBandSet (EMU_DcdcLnRcoBand_TypeDef band)
Set DCDC Low-noise RCO band.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_DcdcLnRcoBand_TypeDef | [in] | band | RCO band to set. |
EMU_VmonInit#
void EMU_VmonInit (const EMU_VmonInit_TypeDef * vmonInit)
Initialize a VMON channel.
Type | Direction | Argument Name | Description |
---|---|---|---|
const EMU_VmonInit_TypeDef * | [in] | vmonInit | The VMON initialization structure. |
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.
EMU_VmonHystInit#
void EMU_VmonHystInit (const EMU_VmonHystInit_TypeDef * vmonInit)
Initialize a VMON channel with hysteresis (separate rise and fall triggers).
Type | Direction | Argument Name | Description |
---|---|---|---|
const EMU_VmonHystInit_TypeDef * | [in] | vmonInit | The VMON hysteresis initialization structure. |
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.
EMU_VmonEnable#
void EMU_VmonEnable (EMU_VmonChannel_TypeDef channel, bool enable)
Enable or disable a VMON channel.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_VmonChannel_TypeDef | [in] | channel | A VMON channel to enable/disable. |
bool | [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.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_VmonChannel_TypeDef | [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 Celsius.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
Returns
Temperature in degrees Celsius
EMU_LDOStatusGet#
bool EMU_LDOStatusGet (void )
Check status of the internal LDO regulator.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
Returns
Return true if the regulator is on, false if regulator is off.
EMU_EnterEM1#
void EMU_EnterEM1 (void )
Enter energy mode 1 (EM1).
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
Note
This function is incompatible with the Power Manager module. When the Power Manager module is present, it must be the one deciding at which EM level the device sleeps to ensure the application properly works. Using both at the same time could lead to undefined behavior in the application.
EMU_VScaleWait#
void EMU_VScaleWait (void )
Wait for voltage scaling to complete.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_VScaleGet#
EMU_VScaleEM01_TypeDef EMU_VScaleGet (void )
Get current voltage scaling level.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
Returns
Current voltage scaling level.
EMU_VmonStatusGet#
bool EMU_VmonStatusGet (void )
Get the status of the voltage monitor (VMON).
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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)
Clear one or more pending EMU interrupts.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [in] | flags | Pending EMU interrupt sources to clear. Use one or more valid interrupt flags for the EMU module (EMU_IFC_nnn or EMU_IF_nnn). |
EMU_IntDisable#
void EMU_IntDisable (uint32_t flags)
Disable one or more EMU interrupts.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [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)
Enable one or more EMU interrupts.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [in] | flags | EMU interrupt sources to enable. Use one or more valid interrupt flags for the EMU module (EMU_IEN_nnn). |
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.
EMU_IntGet#
uint32_t EMU_IntGet (void )
Get pending EMU interrupt flags.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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 )
Get enabled and pending EMU interrupt flags.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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)
Set one or more pending EMU interrupts.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [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 )
Lock EMU registers in order to protect them against unintended modification.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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 )
Unlock the EMU so that writing to locked registers again is possible.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_PowerLock#
void EMU_PowerLock (void )
Lock the EMU regulator control registers in order to protect against unintended modification.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_PowerUnlock#
void EMU_PowerUnlock (void )
Unlock the EMU power control registers so that writing to locked registers again is possible.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_EM2Block#
void EMU_EM2Block (void )
Block entering EM2 or higher number energy modes.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_EM2UnBlock#
void EMU_EM2UnBlock (void )
Unblock entering EM2 or higher number energy modes.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
EMU_UnlatchPinRetention#
void EMU_UnlatchPinRetention (void )
When EM4 pin retention is set to emuPinRetentionLatch, then pins are retained through EM4 entry and wakeup.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
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 )
Temperature measurement ready status.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
Returns
True if temperature measurement is ready
dcdcConstCalibrationLoad#
static bool dcdcConstCalibrationLoad (void )
Load DCDC calibration constants from the DI page.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
A constant means that calibration data that does not change depending on other configuration parameters.
Returns
False if calibration registers are locked.
dcdcValidatedConfigSet#
static void dcdcValidatedConfigSet (void )
Set recommended and validated current optimization and timing settings.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
currentLimitersUpdate#
static void currentLimitersUpdate (void )
Compute current limiters: LNCLIMILIMSEL: LN current limiter threshold LPCLIMILIMSEL: LP current limiter threshold DCDCZDETCTRL: zero detector limiter threshold.
Type | Direction | Argument Name | Description |
---|---|---|---|
void | N/A |
userCurrentLimitsSet#
static void userCurrentLimitsSet (uint32_t maxCurrent_mA, EMU_DcdcLnReverseCurrentControl_TypeDef reverseCurrentControl)
Set static variables that hold the user set maximum peak current and reverse current.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t | [in] | maxCurrent_mA | Set the maximum peak current that the DCDC can draw from the power source. |
EMU_DcdcLnReverseCurrentControl_TypeDef | [in] | reverseCurrentControl | Reverse the current control as defined by EMU_DcdcLnReverseCurrentControl_TypeDef. Positive values have unit mA. |
Update limiters.
compCtrlSet#
static void compCtrlSet (EMU_DcdcLnCompCtrl_TypeDef comp)
Set DCDC low noise compensator control register.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_DcdcLnCompCtrl_TypeDef | [in] | comp | Low-noise mode compensator trim setpoint. |
lpCmpHystCalibrationLoad#
static bool lpCmpHystCalibrationLoad (bool lpAttenuation, uint8_t lpCmpBias, dcdcTrimMode_TypeDef trimMode)
Load EMU_DCDCLPCTRL_LPCMPHYSSEL depending on LP bias, LP feedback attenuation, and DEVINFOREV.
Type | Direction | Argument Name | Description |
---|---|---|---|
bool | [in] | lpAttenuation | LP feedback attenuation. |
uint8_t | [in] | lpCmpBias | lpCmpBias selection. |
dcdcTrimMode_TypeDef | [in] | trimMode | DCDC trim mode. |
lpGetDevinfoVrefLowHigh#
static void lpGetDevinfoVrefLowHigh (uint32_t * vrefL, uint32_t * vrefH, bool lpAttenuation, uint8_t lpcmpBias)
Load LPVREF low and high from DEVINFO.
Type | Direction | Argument Name | Description |
---|---|---|---|
uint32_t * | [out] | vrefL | LPVREF low from DEVINFO. |
uint32_t * | [out] | vrefH | LPVREF high from DEVINFO. |
bool | [in] | lpAttenuation | LP feedback attenuation. |
uint8_t | [in] | lpcmpBias | lpcmpBias to look up in DEVINFO. |
vmonCalibratedThreshold#
static uint32_t vmonCalibratedThreshold (EMU_VmonChannel_TypeDef channel, int threshold)
Get the calibrated threshold value.
Type | Direction | Argument Name | Description |
---|---|---|---|
EMU_VmonChannel_TypeDef | [in] | channel | A VMON channel. |
int | [in] | threshold | A desired threshold in millivolts. |
All VMON channels have two calibration fields in the DI page that describes the threshold at 1.86 V and 2.98 V. This function will convert the uncalibrated input voltage threshold in millivolts into a calibrated threshold.
Returns
A calibrated threshold value to use. The first digit of the return value is placed in the "fine" register fields while the next digits are placed in the "coarse" register fields.