Laird Connectivity BL5340

The BL5340 development kit (DVK, 750-03293) is a single-board development kit for the evaluation and development on the Laird Connectivity BL5340 module which contains a Nordic Semiconductor nRF5340 System-on-Chip (SoC).

The BL5340 is a module with a dual-core nRF5340 SoC based on the Arm® Cortex®-M33 architecture, with:

  • 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 MCU

  • a secondary ARM Cortex-M33 core, with a reduced feature set, running at a fixed 64 MHz, referred to as the Network MCU.

The BL5340 Application MCU supports the Armv8m Security Extension.


The following links provide useful information about the BL5340

BL5340 website:

Nordic Semiconductor TechDocs:

Building TF-M on BL5340 Application MCU

To build an S and NS application image for the BL5340 Application MCU run the following commands:


On OS X change readlink to greadlink, available by running brew install coreutils.

$ mkdir build && cd build
$ cmake -DTFM_PLATFORM=lairdconnectivity/bl5340_dvk_cpuapp \
        -DTFM_TOOLCHAIN_FILE=../toolchain_GNUARM.cmake \
        -G"Unix Makefiles" ../
$ make install


Currently, applications can only be built using GCC (GNU ARM Embedded toolchain).


For BL2 (MCUBoot) logging output to be available, the project needs to be built with Debug configuration (CMAKE_BUILD_TYPE=Debug).