Changelog

All the notable changes to this project are documented on this page.

Main branch 

Added 

Experimental support for the nRF54LS05A device. (DRGN-28121)
The include/mpsl_asserts.h file containing a list of documented MPSL asserts. (DRGN-28123)

nRF Connect SDK v3.3.0 

Added 

Experimental support for the nRF54LS device. (DRGN-26915)
Separate libraries for the nRF54LM and nRF54LV series devices. (DRGN-27252)
The MPSL radio notification API has been added back. (DRGN-27353)
On the nRF54L Series, added mpsl_low_latency_acquire_callback() and mpsl_low_latency_release_callback(). They replace mpsl_constlat_request_callback(), mpsl_lowpower_request_callback(), so a single acquire/release pair covers CPU constant-latency / power profile and NVM (RRAM) low-latency around time-critical MPSL work. To coordinate constant-latency (CONSTLAT) with MPSL through nrf_sys_event, enable CONFIG_NRF_SYS_EVENT; to coordinate NVM latency the same way, enable CONFIG_NRF_SYS_EVENT_IRQ_LATENCY where required. (DRGN-27788)

Changes 

Reduced static RAM usage. (DRGN-26915)
The old high-frequency clock API (mpsl_clock_hfclk_request(), mpsl_clock_hfclk_release(), and mpsl_clock_hfclk_is_running()) is deprecated. It will be removed in a future release. It is superseded by a new API to manage the high-frequency clock for a given source (mpsl_clock_hfclk_src_request(), mpsl_clock_hfclk_src_release(), and mpsl_clock_hfclk_src_is_running()) which was added in v3.1.0.

nRF Connect SDK v3.2.0 

Changes 

Scheduler improvements (DRGN-24450):
- The scheduler can now manage events that are scheduled less than 100 microseconds apart.
- Updated MPSL Timeslot implementation:
  - Signals MPSL_TIMESLOT_SIGNAL_BLOCKED and MPSL_TIMESLOT_SIGNAL_CANCELED are now sent immediately after the specified timeout or start time, instead of being sent early if the scheduler predicted the timeslot could not be scheduled.
  - Timeslots with MPSL_TIMESLOT_HFCLK_CFG_NO_GUARANTEE now request the HFXO, increasing the lowest schedulable timeout for MPSL_TIMESLOT_REQ_TYPE_EARLIEST to 1700us if the HFXO is not running.
  - Timeslot events can now run for longer than 128 seconds.
- Reduced code size for nRF52 and nRF53 Series devices.
- Removed restriction on scheduling events less than 128 seconds into the future for nRF52 and nRF53 Series devices.
- Fixed an issue on nRF54H20 device where an assert could occur if MRAM was not forced on using the CONFIG_MRAM_LATENCY_AUTO_REQ Kconfig option. (DRGN-26065)
The types mpsl_phy_t, mpsl_fem_event_type_t, mpsl_fem_functionality_t, mpsl_cx_req_trig_t, mpsl_pm_event_state_t and mpsl_pm_low_latency_state_t are now a fixed-width uint8_t to not rely on compiler specific size of an enum type. (KRKNWK-20877)
The functions mpsl_hwres_dppi_channel_alloc() and mpsl_hwres_ppib_channel_alloc() have been moved to the mpsl_hwres_ppi.h file. (DRGN-26373)
The MPSL header files now include the nrfx.h file, adding a dependency on nrfx. The MPSL has been tested for compatibility with the nrfx revision used by the corresponding sdk-nrf revision. (DRGN-26373)

Bug fixes 

Fixed unintended clearing of POWER interrupts caused by clearing CLOCK interrupts in mpsl_init() and mpsl_uninit(). (DRGN-26338)
Fixed an assert that could occur on the nRF54H20 SoC if MRAM was not forced on all the time, for example, if the CONFIG_MRAM_LATENCY_AUTO_REQ Kconfig option is set to n. (DRGN-26065)
Fixed an issue where ‐7 dBm was used instead of ‐5 dBm when calling the mpsl_tx_power_radio_supported_power_adjust() or mpsl_tx_power_dbm_to_radio_register_convert() functions. This issue applies only to the nRF54L Series devices. (DRGN-26470)

nRF Connect SDK v3.1.0 

Changes 

The functions mpsl_hwres_dppi_channel_alloc() and mpsl_hwres_ppib_channel_alloc() added by the mpsl_hwres.h file need to be implemented by MPSL users. (KRKNWK-15977)
For the nRF54L Series devices, the inter-domain PPIB connections for Front-End Modules are configured internally in the MPSL. You no longer need to configure the PPIB connections. The field ppib_channels of the mpsl_fem_gpiote_pin_config_t structure is removed. (KRKNWK-15977)
Added the phy parameter to the function mpsl_fem_tx_power_split() and to the function type mpsl_fem_power_model_output_fetch_t. (KRKNWK-20435)

Added 

Added the mpsl_hwres.h file, which defines an API for hardware resources allocation. (KRKNWK-15977)
Added support for the nRF21540 Front-End Module in GPIO/SPI mode on the nRF54L Series SoCs. (KRKNWK-15977)
Added support for the Simple GPIO Front-End Module on the nRF54L Series SoCs. (KRKNWK-20506)
Added support for boosting the current timeslot priority for the nRF 802.15.4 Radio Driver. (KRKNWK-19125)
Added mpsl_clock_hfclk_src_request(), mpsl_clock_hfclk_src_release(), and mpsl_clock_hfclk_src_is_running() to manage the high-frequency clock for a given source.

Bug fixes 

Fixed a rare issue where radio events would be dropped if high-frequency crystal tuning was needed due to a large temperature change when starting the HFXO. In the worst-case scenario, MPSL would not recover from this state and continue to drop radio events. This issue applies only to the nRF54L Series devices. (DRGN-25261)

Removed 

Removed the deprecated function mpsl_fem_simple_gpio_interface_config_get().

nRF Connect SDK v3.0.0 

Changes 

Documented that the mpsl_clock_task_trigger_on_rtc_start_set() function is supported only on the nRF52 and nRF53 Series.
Added support for the nRF21540 GPIO Front-End Module on the nRF54L Series SoCs. (KRKNWK-19928)
The activation of the nRF2220 Front-End Module CS pin now requires a call to the mpsl_fem_enable() function. (KRKNWK-19588)
Applied Errata 22 and Errata 24 to the Front-End Modules on the nRF54L15 SoC. (KRKNWK-19588)
The activation of the nRF21540 Front-End Module PDN pin (in both GPIO and GPIO+SPI modes) now requires a call to the mpsl_fem_enable() function. The PA time gap configuration parameter of the nRF21540 Front-End Module can now have greater values, that allow to activate the TX_EN pin earlier during the ramp-up of the RADIO. The nRF21540 Front-End Module now requires fewer resources (PPI/DPPI channels, EGU channels). For the nRF21540 Front-End Module, only one compare channel of a TIMER is required to configure PA or LNA activation for the MPSL_FEM_EVENT_TYPE_TIMER event type.
The callback passed to the mpsl_clock_hfclk_request() function will be executed when the HFCLK has started and is stable (EVENT_XOTUNED has occurred). (KRKNWK-19689)

Added 

Added the functions mpsl_clock_ctrl_source_register() and mpsl_clock_ctrl_source_unregister() to provide Experimental support for running MPSL with an external clock driver. The APIs are only supported on nR54H Series SoCs. Using these functions makes it possible to use an external clock driver, such as one provided by the nRF Connect SDK. This fixes an issue on nRF54H Series where MPSL would assert or get suboptimal performance when other application components attempt to use a clock. (DRGN-21843)
On the nRF54L15 SoC, Errata 39 is now applied.
Added the defines MPSL_TIMER0 to clarify which timer is being used by MPSL and the timeslot implementation. (DRGN-24434)
New API provided for integration with an external power management system. The API is only supported on nRF54H Series SoCs. This API makes it possible to use an external power management system, such as the one provided by the nRF Connect SDK, to request low latency mode and to request wakeup in time for a future event. Added the functions mpsl_pm_init() and mpsl_pm_uninit() to enable and disable integration. Added the functions mpsl_pm_params_get(), mpsl_pm_low_latency_requested(), mpsl_pm_low_latency_state_set() and mpsl_pm_low_latency_state_get() to register wakeup time and request low latency. (DRGN-17150)
Added the functions mpsl_fem_nrf2220_temperature_changed(), mpsl_fem_nrf2220_temperature_changed_update_request(), and mpsl_fem_nrf2220_temperature_changed_update_now() to compensate the temperature of the nRF2220 Front-End Module. (KRKNWK-19862)

Removed 

Removed the deprecated function mpsl_fem_prepare_powerdown(). (KRKNWK-16691)

Bug fixes 

Fixed an issue where the GRTC interrupt could be left pending after mpsl_init() had run. In nRF Connect SDK this could cause stack corruption early in the Zephyr init sequence after a softreset. (DRGN-24850)
Fixed an issue where mpsl_constlat_request_callback() would be called more often than mpsl_lowpower_request_callback(). (DRGN-25031) This would only occur under rare conditions when two timing events are spaced very close to each other. This may cause an assertion if the nrfx power driver is used to implement these callbacks. The issue causes the power consumption to increase, and may eventually lead to the assertion.

nRF Connect SDK v2.9.2 

Bug fixes 

Fixed an issue where the GRTC interrupt could be left pending after mpsl_init() had run. In nRF Connect SDK this could cause stack corruption early in the Zephyr init sequence after a softreset. (DRGN-24850)

nRF Connect SDK v2.9.1 

Added 

On the nRF54L15 SoC, Errata 39 is now applied.

nRF Connect SDK v2.9.0 

Bug fixes 

Fixed an issue where the functions mpsl_clock_hfclk_request() and mpsl_clock_hfclk_release() could end up not working after mpsl_uninit() This could happen if LFRC was used as clock source (DRGN-23325)

nRF Connect SDK v2.8.0 

Changes 

Removed support for running MPSL on the nRF54L15 PDK v0.7.0 and earlier. (DRGN-23325)
Removed support for running MPSL on the Engineering A revision of the nRF54H20 SoC. (DRGN-23325)
On nRF54L Series devices, the application now needs to implement mpsl_constlat_request_callback() and mpsl_lowpower_request_callback(). This is already added to the MPSL driver in the nRF Connect SDK. (DRGN-22562)
Removed the mpsl_coex.h API. (DRGN-22567)
The timeslot implementation now starts TIMER0 a couple microseconds later. It now starts when the MPSL_TIMESLOT_SIGNAL_START callback is given.

Added 

Added production support for the nRF54L Series. (DRGN-23325)
Added mpsl_fem_enable() to allow turning on the Front-End Module earlier than through a call to mpsl_fem_pa_configuration_set() (KRKNWK-19275). Added implementation of mpsl_fem_enable() for nRF2220 Front-End Module.
Added the defines MPSL_PPI_CHANNELS_USED_MASK, MPSL_DPPIC_CHANNELS_USED_MASK, MPSL_DPPIC10_CHANNELS_USED_MASK, MPSL_DPPIC20_CHANNELS_USED_MASK, and MPSL_DPPIC020_CHANNELS_USED_MASK. These represent the same resources as MPSL_RESERVED_PPI_CHANNELS, but also specify the DPPI controller the channels belongs to.
Added the defines MPSL_PPIB11_CHANNELS_USED_MASK, MPSL_PPIB21_CHANNELS_USED_MASK, and MPSL_IPCT130_CHANNELS_USED_MASK. These represent the PPIB and IPCT resources used.

nRF Connect SDK v2.7.0 

Changes 

Fixed a rare issue that could cause a scheduler assert if interrupts were disabled for a longer period of time (DRGN-24327). Note that disabling interrupts for a longer period of time is not allowed.
The default bit width within timeslots for TIMER0 has been increased from 24 to 32 bits. The user may still configure TIMER0 however they like during the timeslot. (DRGN-19050)
New FEM protocol APIs are provided to control the PA power, the previous APIs are removed. This change does not affect applications developed in the nRF Connect SDK context. mpsl_fem_pa_power_control_set() replaces mpsl_fem_pa_gain_set(). mpsl_fem_caps_get() replaces mpsl_fem_pa_is_configured(). The mpsl_tx_power_split_t structure contains the new field fem_pa_power_control to be used with the mpsl_fem_pa_power_control_set() function. The mpsl_fem_gain_t type is deprecated, please use mpsl_fem_pa_power_control_t type instead (KRKNWK-18729).
The FEM libraries for nRF2220 and nRF2240 no more link directly to the TWIM library.
- The TWI implementation now needs to be provided externally.
- The limitation that only the TWIM0 instance could be used for nRF2220 and nRF2240 devices is removed.
- mpsl_fem_twi_if_t replaces mpsl_fem_twi_config_t.
- The twi_if field replaces the twi_config field within mpsl_fem_nrf2220_interface_config_t and mpsl_fem_nrf2240_interface_config_t (KRKNWK-19010).

nRF Connect SDK v2.6.3 

All the notable changes included in the nRF Connect SDK v2.6.3 release are documented in this section.

Changes 

Fixed a rare issue that could cause a scheduler assert if interrupts were disabled for a longer period of time (DRGN-24327). Note that disabling interrupts for a longer period of time is not allowed.

nRF Connect SDK v2.6.0 

All the notable changes included in the nRF Connect SDK v2.6.0 release are documented in this section.

Changes 

The MPSL radio notification API has been removed. (DRGN-20447)

nRF Connect SDK v2.5.0 

All the notable changes included in the nRF Connect SDK v2.5.0 release are documented in this section.

Changes 

FEM-related firmware is now built and deployed into separate libraries, one for each FEM implementation (such as simple_gpio).
The mpsl_calibration_timer_handle() function must now be called when calibrating.

Added 

Added mpsl_tx_power_dbm_to_radio_register_convert() to convert supported power in dBm to a register code for RADIO. (KRKNWK-17367)
Added mpsl_clock_task_trigger_on_rtc_start_set() to trigger a PPI/DPPI task when the RTC starts. (DRGN-20396)

nRF Connect SDK v2.4.0 

All the notable changes included in the nRF Connect SDK v2.4.0 release are documented in this section.

Changes 

Removed deprecated API for specifying the FEM pin configuration type associated with MPSL_FEM_PIN_CFG_TYPE_PIN_PORT. Only the mpsl_fem_pin_t configuration is supported as a FEM pin configuration now (KRKNWK-16496).

Added 

Function for getting configuration of simple GPIO front-end module mpsl_fem_simple_gpio_interface_config_get().

nRF Connect SDK v2.3.0 

All the notable changes included in the nRF Connect SDK v2.3.0 release are documented in this section.

Added 

The bool parameter tx_power_ceiling to the external model used by the mpsl_fem_tx_power_split() function. When enabled, the function returns the ceiling value instead of the floor.

Bug fixes 

Fixed a rare issue that could cause a scheduler assert if two roles were running (DRGN-18308).
Fixed a rare issue that could cause an assert when requesting timeslots with type MPSL_TIMESLOT_REQ_TYPE_EARLIEST (DRGN-18555).

nRF Connect SDK v2.2.0 

All the notable changes included in the nRF Connect SDK v2.2.0 release are documented in this section.

Bug fixes 

Fixed an issue where the scheduler could put events in the past (DRGN-17851, DRGN-18105).

nRF Connect SDK v2.1.3 

All the notable changes included in the nRF Connect SDK v2.1.3 release are documented in this section.

Bug fixes 

Fixed an issue where the scheduler could put events in the past. (DRGN-17923, DRGN-18105)

nRF Connect SDK v2.1.0 

All the notable changes included in the nRF Connect SDK v2.1.0 release are documented in this section.

Added 

Support for the nRF21540 GPIO & SPI front-end module. SPI is used to set Tx gain of the nRF21540 in runtime. Support for this mode of operation for nRF21540 with Bluetooth LE is experimental.
Support for adding an optional external model used to split the requested transmit power into components. This is then used by mpsl_fem_tx_power_split(). (KRKNWK-14464)
An experimental version of a built-in nRF21540 GPIO & SPI front-end module compensation model.

Changes 

Removed the nrf_802154_fal_tx_power_get() function that is not used anymore by nRF 802.15.4 Radio Driver. (KRKNWK-14336)
Changed mpsl_fem_tx_power_split() function so the mpsl_tx_power_split_t.radio_tx_power field contains a value supported by the RADIO peripheral. Previously the value needed to be adjusted before applying to the RADIO peripheral. (KRKNWK-14323)
Changed mpsl_fem_gpiote_pin_config_t and mpsl_fem_gpio_pin_config_t to require GPIO port address, port number and relative pin number instead of the absolute pin number. (KRKNWK-11891)
Added production support for the 1-wire coexistence interface on the Nordic nRF52 Series. (DRGN-16439)
Added mpsl_clock_hfclk_latency_set() which may be used to communicate the true high-frequency oscillator ramp-up time to MPSL. When not used, MPSL will make a worst-case assumption. (DRGN-13559)
Added mpsl_tx_power_radio_supported_power_adjust() which lets users adjust the TX power to a value supported by the radio peripheral. (KRKNWK-14770)
Changed mpsl_fem_tx_power_split() so that the returned front-end module gain component is a structure containing the gain in dB and a front-end module implementation specific private setting. Changed mpsl_fem_pa_gain_set() to accept this structure and apply the settings that it stores.
Changed mpsl_fem_tx_power_split() to return the real achieved output power.

nRF Connect SDK v2.0.0 

All the notable changes included in the nRF Connect SDK v2.0.0 release are documented in this section.

Added 

Support for changing PA gain during runtime through MODE pin switching for the nRF21540 GPIO front-end module.

Changes 

Removed support for running MPSL on the nRF5340 PDK (DRGN-15174).
Timeslot API values MPSL_TIMESLOT_DISTANCE_MAX_US and MPSL_TIMESLOT_EARLIEST_TIMEOUT_MAX_US increased to 256 seconds (DRGN-16800).
Extended mpsl_fem_nrf21540_gpio_interface_config_t with mpsl_fem_nrf21540_gpio_interface_config_t.mode_pin_config and mpsl_fem_nrf21540_gpio_interface_config_t.fem_config.pa_gains_db

Bug fixes 

Fixed an issue where mpsl_uninit() would not disable the PPI channels used by MPSL (DRGN-16515).
Fixed an issue where mpsl_init() would reject a certain clock configuration for no longer applicable legacy reasons (DRGN-16884).
Fixed an issue where MPSL could assert when radio notifications on ACTIVE (MPSL_RADIO_NOTIFICATION_TYPE_INT_ON_ACTIVE or MPSL_RADIO_NOTIFICATION_TYPE_INT_ON_BOTH) were used (DRGN-16642).
Fixed an issue where mpsl_uninit() would hang indefinitely when the RC oscillator was used as the Low Frequency Clock source (DRGN-16515).
Fixed an issue where the High Frequency Clock would stay active if it was turned on between timing events. This could occur during Low Frequency Clock calibration when using the RC oscillator as the Low Frequency Clock source (DRGN-17014).

nRF Connect SDK v1.9.2 

All the notable changes included in the nRF Connect SDK v1.9.2 release are documented in this section.

Bug fixes 

Fixed an issue where the High Frequency Clock would stay active if it was turned on between timing events. This could occur during Low Frequency Clock calibration when using the RC oscillator as the Low Frequency Clock source (DRGN-17014).

nRF Connect SDK v1.9.0 

All the notable changes included in the nRF Connect SDK v1.9.0 release are documented in this section.

Added 

Added a new header file mpsl_dppi_protocol_api.h which exposes DPPI channels that have a fixed configuration during the lifetime of a radio event (DRGN-16308). This will facilitate debugging of protocol implementations. Currently these channels are guaranteed to be applied correctly for Bluetooth only.

nRF Connect SDK v1.8.0 

All the notable changes included in the nRF Connect SDK v1.8.0 release are documented in this section.

Added 

Added support for the Simple GPIO Front-End Module implementation on the nRF53 Series.
Added support and separate documentation for Bluetooth External Radio Coexistence on the nRF52 Series (DRGN-11849).
Added experimental support for the 1-wire coexistence interface on the nRF52 Series (DRGN-16439).

Changes 

References to Bluetooth support were moved away from projects/mpsl/doc/public/doc/cx.rst. Its scope is now limited to IEEE 802.15.4 External Radio Coexistence.

Bug fixes 

Fixed an issue where the current consumption in some cases was high after the end of a timeslot when using MPSL_TIMESLOT_HFCLK_CFG_NO_GUARANTEE. Now the time from the request with type MPSL_TIMESLOT_REQ_TYPE_EARLIEST until the event starts is in some cases increased (DRGN-16506).

nRF Connect SDK v1.7.0 

All the notable changes included in the nRF Connect SDK v1.7.0 release are documented in this section.

Added 

Added support for nRF21540 GPIO Front-End Module for nRF53 Series.
Added a public interface for the radio coexistence protocol API (KRKNWK-7490). This public interface can be used to replace the example implementation of the radio coexistence with other implementations compliant with other Packet Traffic Arbitration (PTA) interfaces.

Changes 

The mpsl_fem_protocol_api.h was moved from the include directory to the include/protocol directory (KRKNWK-10507).
The start signal jitter for the timeslot API (MPSL_TIMESLOT_START_JITTER_US) has been reduced to 1us. (DRGN-15842).

nRF Connect SDK v1.6.0 

All the notable changes included in the nRF Connect SDK v1.6.0 release are documented in this section.

Added 

Added an API to set and get a flag that determines whether to apply the DEVICE-CONFIG-254. The API user shall set the flag to desired value with mpsl_fem_device_config_254_shall_apply_set(). The protocol stacks’ responsibility is to check the flag value using mpsl_fem_device_config_254_shall_apply_get() and apply the configuration when the flag value is true.
Added support for the nRF5340 device, which was previously only supported for evaluation purposes (DRGN-8639).
Added a function to the FEM protocol API to disable FEM when no radio activity is expected. This function is intended to reduce power consumption (KRKNWK-8842).

Changes 

Reserved TIMER1 for use by MPSL on nRF5340 (DRGN-15721).

Bug fixes 

Fixed an issue where the clock configuration option mpsl_clock_lfclk_cfg_t.skip_wait_lfclk_started did not work as expected with nRF5340 devices (DRGN-15223).

nRF Connect SDK v1.5.1 

Bug fixes 

Fixed an issue where the clock configuration option mpsl_clock_lfclk_cfg_t.skip_wait_lfclk_started did not work as expected with nRF5340 devices (DRGN-15223).

nRF Connect SDK v1.5.0 

All the notable changes included in the nRF Connect SDK v1.5.0 release are documented in this section.

Added 

Added a new signal to the MPSL timeslot: MPSL_TIMESLOT_SIGNAL_OVERSTAYED. This signal is given to the application when a timeslot session is closed too late (DRGN-14677).
Added a new clock configuration option skip_wait_lfclk_started in mpsl_clock_lfclk_cfg_t, which does not wait for the start of the low-frequency clock (DRGN-14204).
Added macro MPSL_RESERVED_PPI_CHANNELS for a bit mask of (D)PPI channels reserved by MPSL (DRGN-13356).

Bug fixes 

Fixed an issue where the low-frequency clock was configured incorrectly when the source configuration signal was set to either External Full swing or External Low swing (DRGN-15064).
Fixed an issue where MPSL waited for the low-frequency clock to start even though it was configured not to wait for it (DRGN-15176).

nRF Connect SDK v1.4.1 

Added 

Added a new clock configuration option skip_wait_lfclk_started in mpsl_clock_lfclk_cfg_t, which does not wait for the start of Low Frequency Clock. (DRGN-14204)

Bugfixes 

Fixed an issue where Low Frequency Clock was configured incorrectly when the source configuration signal was set to either External Full swing or External Low swing. (DRGN-15064)

nRF Connect SDK v1.4.0 

All the notable changes included in the nRF Connect SDK v1.4.0 release are documented in this section.

Changes 

Changed the timeslot implementation to support up to 8 concurrent sessions (DRGN-13952). It is now necessary to supply a timeslot context configuration using mpsl_timeslot_session_count_set(). All timeslot APIs now take a session_id as input. The session id is retrieved from mpsl_timeslot_session_open().
Added an API to use Front-End Modules, like the nRF21540 GPIO or a simple GPIO, with the protocols and an API to configure them using the application. Only the nRF52 Series is supported.

Bug fixes 

Fixed an issue where both the high-frequency clock and TIMER0 were not turned off during idle periods shorter than 9 ms (DRGN-14152). This increased the average power consumption. Such a case could occur when running a Bluetooth LE connection with a connection interval of 7.5 ms.

Added API for fetching build revision information.
Added API to set a TX Power envelope. Protocols using MPSL will limit their TX power to a value equal to, or lower than, the provided value.
Added support for using a low-swing and full-swing LF clock.
The support for integrating an 802.15.4 driver is now improved.

Changes 

Removed MPSL_RADIO_NOTIFICATION_DISTANCE_425US and replaced it by MPSL_RADIO_NOTIFICATION_DISTANCE_420US.
On nRF53, the fix for Errata 16 is now applied.
The scheduling overhead of a timeslot event is reduced.

Bug fixes 

Fixed an issue on nRF53 where an assert could occur when using a timeslot.

nRF Connect SDK v1.2.0 

All the notable changes included in the nRF Connect SDK v1.2.0 release are documented in this section.

Added 

Added a library version with preliminary support for the nRF5340 device. The feature set is the same as in the MPSL library for nRF52. The following library has been added:
- soft-float/libmpsl.a

Changes 

Removed _nrf52 from the MPSL library file names.
Version numbers have been removed from the libraries.
It is no longer allowed to call mpsl_init() if MPSL is already initialized.
Clock configuration parameters for any stack that uses MPSL must be provided in mpsl_clock_lfclk_cfg_t to mpsl_init(). This now also involves clock accuracy.
Clock accuracy must be specified in parts per million (ppm).
Renamed the MPSL clock API for the high-frequency and low-frequency clocks.

MPSL 0.5.0-1.prealpha 

Initial release.

Added 

Added the following MPSL library build variants:
- hard-float/libmpsl_nrf52.a
- soft-float/libmpsl_nrf52.a
- softfp-float/libmpsl_nrf52.a