boards: Add the Nordic nRF5340 audio DK

boards/arm/nrf5340_audio_dk_nrf5340/CMakeLists.txt

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+# Copyright (c) 2021 Nordic Semiconductor ASA.
+# SPDX-License-Identifier: Apache-2.0
+
+if ((CONFIG_BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP OR CONFIG_BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS)
+    AND CONFIG_BOARD_ENABLE_CPUNET)
+  zephyr_library()
+  zephyr_library_sources(nrf5340_audio_dk_cpunet_reset.c)
+
+  if (CONFIG_BUILD_WITH_TFM)
+    zephyr_library_include_directories(
+      $<TARGET_PROPERTY:tfm,TFM_BINARY_DIR>/install/interface/include
+    )
+  endif()
+
+endif()

boards/arm/nrf5340_audio_dk_nrf5340/Kconfig

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+# nRF5340 Audio DK board configuration
+
+# Copyright (c) 2019 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+config BOARD_ENABLE_DCDC_APP
+	bool "Application MCU DCDC converter"
+	select SOC_DCDC_NRF53X_APP
+	default y
+
+config BOARD_ENABLE_DCDC_NET
+	bool "Network MCU DCDC converter"
+	select SOC_DCDC_NRF53X_NET
+	default y
+
+config BOARD_ENABLE_DCDC_HV
+	bool "High Voltage DCDC converter"
+	select SOC_DCDC_NRF53X_HV
+	default y
+
+config BOARD_ENABLE_CPUNET
+	bool "nRF53 Network MCU"
+	select SOC_NRF_GPIO_FORWARDER_FOR_NRF5340 if \
+		$(dt_compat_enabled,$(DT_COMPAT_NORDIC_NRF_GPIO_FORWARDER))
+	help
+	  This option enables releasing the Network 'force off' signal, which
+	  as a consequence will power up the Network MCU during system boot.
+	  Additionally, the option allocates GPIO pins that will be used by UARTE
+	  of the Network MCU.
+	  Note: GPIO pin allocation can only be configured by the secure Application
+	  MCU firmware, so when this option is used with the non-secure version of
+	  the board, the application needs to take into consideration, that the
+	  secure firmware image must already have configured GPIO allocation for the
+	  Network MCU.
+	default y if (BT || NRF_802154_SER_HOST)
+
+config DOMAIN_CPUNET_BOARD
+	string
+	default "nrf5340_audio_dk_nrf5340_cpunet"
+	depends on BOARD_ENABLE_CPUNET
+	help
+	  The board which will be used for CPUNET domain when creating a multi
+	  image application where one or more images should be located on
+	  another board. For example hci_rpmsg on the nRF5340_cpunet for
+	  Bluetooth applications.
+
+endif # BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+config DOMAIN_CPUAPP_BOARD
+	string
+	default "nrf5340_audio_dk_nrf5340_cpuapp"
+	depends on BOARD_NRF5340_AUDIO_DK_NRF5340_CPUNET
+	help
+	  The board which will be used for CPUAPP domain when creating a multi
+	  image application where one or more images should be located on
+	  another board.

boards/arm/nrf5340_audio_dk_nrf5340/Kconfig.board

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+# nRF5340 Audio DK board configuration
+
+# Copyright (c) 2019 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_NRF5340_CPUAPP_QKAA
+
+config BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP
+	bool "nrf5340 Audio DK nRF5340 Application MCU"
+
+config BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+	bool "nrf5340 Audio DK nRF5340 Application MCU non-secure"
+
+endif # SOC_NRF5340_CPUAPP_QKAA
+
+config BOARD_NRF5340_AUDIO_DK_NRF5340_CPUNET
+	bool "nrf5340 Audio DK NRF5340 Network MCU"
+	depends on SOC_NRF5340_CPUNET_QKAA

boards/arm/nrf5340_audio_dk_nrf5340/Kconfig.defconfig

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+# nRF5340 Audio DK board configuration
+
+# Copyright (c) 2019 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+config BOARD
+	default "nrf5340_audio_dk_nrf5340_cpuapp" if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+# Code Partition:
+#
+# For the secure version of the board the firmware is linked at the beginning
+# of the flash, or into the code-partition defined in DT if it is intended to
+# be loaded by MCUboot. If the secure firmware is to be combined with a non-
+# secure image (TRUSTED_EXECUTION_SECURE=y), the secure FW image shall always
+# be restricted to the size of its code partition.
+#
+# For the non-secure version of the board, the firmware
+# must be linked into the code-partition (non-secure) defined in DT, regardless.
+# Apply this configuration below by setting the Kconfig symbols used by
+# the linker according to the information extracted from DT partitions.
+
+# SRAM Partition:
+#
+# If the secure firmware is to be combined with a non-secure image
+# (TRUSTED_EXECUTION_SECURE=y), the secure FW image SRAM shall always
+# be restricted to the secure image SRAM partition (sram-secure-partition).
+# Otherwise (if TRUSTED_EXECUTION_SECURE is not set) the whole zephyr,sram
+# may be used by the image.
+#
+# For the non-secure version of the board, the firmware image SRAM is
+# always restricted to the allocated non-secure SRAM partition.
+#
+# Workaround for not being able to have commas in macro arguments
+DT_CHOSEN_Z_CODE_PARTITION := zephyr,code-partition
+DT_CHOSEN_Z_SRAM_PARTITION := zephyr,sram-secure-partition
+
+if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP && TRUSTED_EXECUTION_SECURE
+
+config FLASH_LOAD_SIZE
+	default $(dt_chosen_reg_size_hex,$(DT_CHOSEN_Z_CODE_PARTITION))
+
+config SRAM_SIZE
+	default $(dt_chosen_reg_size_int,$(DT_CHOSEN_Z_SRAM_PARTITION),0,K)
+
+endif # BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP && TRUSTED_EXECUTION_SECURE
+
+if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+config FLASH_LOAD_OFFSET
+	default $(dt_chosen_reg_addr_hex,$(DT_CHOSEN_Z_CODE_PARTITION))
+
+config FLASH_LOAD_SIZE
+	default $(dt_chosen_reg_size_hex,$(DT_CHOSEN_Z_CODE_PARTITION))
+
+endif # BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+endif # BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+config BOARD
+	default "nrf5340_audio_dk_nrf5340_cpunet" if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUNET
+
+config IPM_NRFX
+	default IPM
+
+config MBOX_NRFX_IPC
+	default MBOX
+
+if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+choice BT_HCI_BUS_TYPE
+	default BT_RPMSG if BT
+endchoice
+
+config HEAP_MEM_POOL_SIZE
+	default 4096 if BT_RPMSG
+
+endif # BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP || BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS
+
+if BOARD_NRF5340_AUDIO_DK_NRF5340_CPUNET
+
+config BT_CTLR
+	default y if BT
+
+endif # BOARD_NRF5340_AUDIO_DK_NRF5340_CPUNET
+
+config UART_NRF_DK_SERIAL_WORKAROUND
+	default y if ZTEST
+
+# When the nRF DK serial workaround is enabled, increase the stack size in
+# tests built with no optimizations, as the standard size may be insufficient
+# then. Use 512 to align with the FPU_SHARING case, where the default value
+# is also modified.
+config TEST_EXTRA_STACK_SIZE
+	default 512 if UART_NRF_DK_SERIAL_WORKAROUND && NO_OPTIMIZATIONS

boards/arm/nrf5340_audio_dk_nrf5340/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+if(CONFIG_BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS)
+  set(TFM_PUBLIC_KEY_FORMAT "full")
+endif()
+
+if(CONFIG_BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP OR CONFIG_BOARD_NRF5340_AUDIO_DK_NRF5340_CPUAPP_NS)
+  board_runner_args(jlink "--device=nrf5340_xxaa_app" "--speed=4000")
+endif()
+
+if(CONFIG_BOARD_NRF5340_AUDIO_DK_NRF5340_CPUNET)
+  board_runner_args(jlink "--device=nrf5340_xxaa_net" "--speed=4000")
+endif()
+
+include(${ZEPHYR_BASE}/boards/common/nrfjprog.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

boards/arm/nrf5340_audio_dk_nrf5340/doc/index.rst

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+.. _nrf5340_audio_dk_nrf5340:
+
+nRF5340 Audio DK
+################
+
+Overview
+********
+
+The nRF5340 Audio DK (PCA10121) is designed for showcasing, developing and experimenting
+with Bluetooth® LE Audio.
+
+You can use this board for developing LE-Audio-compatible applications that support Auracast™,
+connected isochronous streams (CIS) and broadcast isochronous streams (BIS),
+and offer support for acting as a audio source, audio sink and source + sink.
+
+Zephyr uses the nrf5340_audio_dk_nrf5340 board configuration for building
+for the nRF5340 Audio DK.
+
+Hardware
+********
+
+The nRF5340 Audio DK comes with the following hardware features:
+
+* nRF5340 dual-core SoC based on the Arm® Cortex®-M33 architecture
+* CS47L63 Low-Power Audio DSP with mono differential headphone driver
+* nPM1100 Ultra-small form-factor Power Management IC
+* On-board digital microphone
+* On-board power measurement
+* SD card slot
+* Built-in debugger
+* Stereo analog input using 3.5 mm jack
+* USB soundcard capability
+
+.. figure:: img/nrf5340_audio_dk.jpg
+     :align: center
+     :alt: nRF5340 DK
+
+More information about the board can be found at the `nRF5340 Audio DK website`_. The `Nordic Semiconductor Infocenter`_
+contains the processor's information and the datasheet.
+
+nRF5340 SoC
+===========
+
+The nRF5340 Audio DK is built around the nRF5340 SoC, which has the following characteristics:
+
+* A full-featured Arm Cortex-M33F core with DSP instructions,
+  FPU, and Armv8-M Security Extension, running at up to 128 MHz,
+  referred to as the **application core**.
+* A secondary Arm Cortex-M33 core, with a reduced feature set,
+  running at a fixed 64 MHz, referred to as the **network core**.
+
+The nrf5340_audio_dk_nrf5340_cpuapp build target provides support for the application
+core on the nRF5340 SoC. The nrf5340_audio_dk_nrf5340_cpunet build target provides
+support for the network core on the nRF5340 SoC.
+
+
+The `Nordic Semiconductor Infocenter`_ contains the processor's information and
+the datasheet.
+
+Supported Features
+==================
+
+See :ref:`nrf5340dk_nrf5340` and `Nordic Semiconductor Infocenter`_
+for a complete list of nRF5340 Audio DK board hardware features.
+
+
+Programming and Debugging
+*************************
+
+Flashing
+========
+
+Follow the instructions in the :ref:`nordic_segger` page to install
+and configure all the necessary software. Further information can be
+found in :ref:`nordic_segger_flashing`. Then you can build and flash
+applications as usual (:ref:`build_an_application` and
+:ref:`application_run` for more details).
+
+.. warning::
+
+   The nRF5340 has a flash read-back protection feature. When flash read-back
+   protection is active, you will need to recover the chip before reflashing.
+   If you are flashing with :ref:`west <west-build-flash-debug>`, run
+   this command for more details on the related ``--recover`` option:
+
+   .. code-block:: console
+
+      west flash -H -r nrfjprog --skip-rebuild
+
+.. note::
+
+   Flashing and debugging applications on the nRF5340 Audio DK requires
+   upgrading the nRF Command Line Tools to version 10.12.0. Further
+   information on how to install the nRF Command Line Tools can be
+   found in :ref:`nordic_segger_flashing`.
+
+Debugging
+=========
+
+Refer to the :ref:`nordic_segger` page to learn about debugging Nordic
+boards with a Segger IC.
+
+References
+**********
+
+.. target-notes::
+
+.. _nRF5340 Audio DK website:
+   https://www.nordicsemi.com/Products/Development-hardware/nrf5340-audio-dk
+.. _Nordic Semiconductor Infocenter: https://infocenter.nordicsemi.com