nRF Connect SDK v2.6.99-cs2 Release Notes

nRF Connect SDK v2.6.99-cs2 is a customer sampling release, tailored exclusively for participants in the nRF54H20 SoC customer sampling program. Do not use this release of nRF Connect SDK if you are not participating in the program.

The release is not part of the regular release cycle and is specifically designed to support early adopters working with the nRF54H20 SoC. It is intended to provide early access to the latest developments for nRF54H20 SoC, enabling participants to experiment with new features and provide feedback.

The scope of this release is intentionally narrow, concentrating solely on the nRF54H20 DK. You can use the latest stable release of nRF Connect SDK to work with other boards.

All functionality related to nRF54H20 SoC is considered experimental.

Migration notes 

See the Migration notes for nRF Connect SDK v2.6.99_cs2 for v2.4.99-cs3 users for the changes required or recommended when migrating your application from v2.4.99-cs3 to v2.6.99-cs2.

Changelog 

The following sections provide detailed lists of changes by component.

Peripherals support 

Added experimental support for the following peripherals on the nRF54H20 DK:
- ADC
- CLOCK
- GPIO
- GRTC
- I2C
- MRAM
- NFCT
- PWM
- RADIO (Bluetooth Low Energy and 802.15.4)
- SPI
- UART
- WDT

Working with nRF54H Series 

Added the Working with nRF54H Series section.

Protocols 

This section provides detailed lists of changes by protocol. See Samples for lists of changes for the protocol-related samples.

Enhanced ShockBurst (ESB)

Added:
- Support for the nRF54H20 DK board.
- Fast switching between radio states for the nRF54H20 SoC.
- Fast radio channel switching for the nRF54H20 SoC.

Samples 

This section provides detailed lists of changes by sample.

Bluetooth samples 

Bluetooth: Direct Test Mode sample:
- Added:
  - Support for the nRF54H20 DK with build target nrf54h20dk_nrf54h20_cpurad.
  - Experimental support for the HCI interface.
- Updated the internal sample API.

Enhanced ShockBurst samples 

Added support for the nRF54H20 DK with build target nrf54h20dk_nrf54h20_cpurad in the following ESB samples:
- Enhanced ShockBurst: Receiver sample
- Enhanced ShockBurst: Transmitter sample

Multicore samples 

multicore_hello_world sample:
- Added support for the nRF54H20 DK with build target nrf54h20dk_nrf54h20_cpuapp.

Peripheral samples 

Radio test (short-range) sample:
- Added support for the nRF54H20 DK with build target nrf54h20dk_nrf54h20_cpurad.
- Updated the CLI command fem tx_power_control <tx_power_control> which replaces fem tx_gain <tx_gain> . This change applies to the sample built with the Kconfig option CONFIG_RADIO_TEST_POWER_CONTROL_AUTOMATIC set to n.

Zephyr 

The Zephyr fork in nRF Connect SDK (sdk-zephyr) contains all commits from the upstream Zephyr repository up to and including 0051731a41fa2c9057f360dc9b819e47b2484be5, with some nRF Connect SDK specific additions.

For the list of upstream Zephyr commits (not including cherry-picked commits) incorporated into the nRF Connect SDK since the most recent release, run the following command from the ncs/zephyr repository (after running west update):

git log --oneline 0051731a41 ^23cf38934c

For the list of nRF Connect SDK specific commits, including commits cherry-picked from upstream, run:

git log --oneline manifest-rev ^0051731a41

The current nRF Connect SDK main branch is based on revision 0051731a41 of Zephyr.

Note

For possible breaking changes and changes between the latest Zephyr release and the current Zephyr version, refer to the Zephyr release notes.

Zephyr samples 

Added support for the nRF54H20 DK in the following Zephyr samples:

Documentation 

Added:
- The Working with nRF54H Series section.
- The Migration guide for nRF Connect SDK v2.6.99_cs2 for v2.4.99-cs3 users section.
Updated the table listing the boards included in sdk-zephyr with the nRF54H20 DK board.

Current nRF54H20 DK Limitations 

On the nRF54H20 DK Revision PCA10175 v0.7.x, the ON and OFF markings for the power switch on the PCB are switched.
On all the revisions of the nRF54H20 DK, buttons and LEDs on the PCB are numbered from 0 to 3 instead of from 1 to 4.