Cmake script for projects targeting Nordic Semiconductor nRF5x series devices using the GCC toolchain from ARM.

The script makes use of the following tools:

• nRF5x SDK by Nordic Semiconductor - SoC specific drivers and libraries (also includes a lot of examples)
• JLink by Segger - interface software for the JLink family of programmers
• nrfjprog by Nordic Semiconductor - Wrapper utility around JLink
• arm-non-eabi-gcc by ARM and the GCC Team - compiler toolchain for embedded (= bare metal) ARM chips

1. Download this repo (or add as submodule) to the directory cmake-nRF5x in your project

2. Search the SDK example directory for a sdk_config.h, main.c and a linker script (normally named <project_name>_gcc_<chip family>.ld) that fits your chip and project needs.

3. Copy the sdk_config.h and the project main.c into a new directory src. Modify them as required for your project.

4. Copy the linker script into the root of your project. Rename it to just gcc_<chip family>.ld For example:

   gcc_nrf51.ld
   gcc_nrf52.ld
   

5. Create a new CMakeLists.txt file at the same level. Add the project standard cmake project header

   A typical file may look like this:

   cmake_minimum_required(VERSION 3.6)
   
   set(NRF_TARGET "nrf52")
   
   # optional, won't be used if passing toolchain on command line (see below)
   if (NOT DEFINED ARM_NONE_EABI_TOOLCHAIN_PATH)
   	set(ARM_NONE_EABI_TOOLCHAIN_PATH "/usr/local/bin")
   endif ()
   
   set(NRF5_SDK_PATH "${CMAKE_SOURCE_DIR}/toolchains/nRF5/nRF5_SDK")
   set(NRFJPROG "${CMAKE_SOURCE_DIR}/toolchains/nRF5/nrfjprog/nrfjprog")
   
   include("cmake-nRF5x/CMake_nRF5x.cmake")
   
   # must be called before first project call or add_subdirectory unless passing on command line
   nRF5x_toolchainSetup()
   
   project(YourProjectName C ASM)
   
   nRF5x_setup()
   
   nRF5x_addAppScheduler()
   nRF5x_addAppFIFO()
   nRF5x_addAppTimer()
   nRF5x_addAppUART()
   nRF5x_addAppButton()
   nRF5x_addBSP(TRUE FALSE FALSE)
   nRF5x_addBLEGATT()
   
   
   nRF5x_addBLEService(ble_bas)
   
   add_definitions(-DCONFIG_GPIO_AS_PINRESET)
   		
   include_directories("./src")
   list(APPEND SOURCE_FILES "./src/main.c")
   
   nRF5x_addExecutable(${PROJECT_NAME} "${SOURCE_FILES}")
   

   Adjust as needed for your project.

   Note: you can add CXX between C ASM to add c++ support

6. Optionally add additional libraries:

   Only the most common drivers and libraries are wrapped with cmake macros.

   To include BLE services, use nRF5x_addBLEService(<service name>).

   For other SDK libraries you can use include_directories and list(APPEND SDK_SOURCE_FILES ...) to add them. For example:

   include_directories(
           "${NRF5_SDK_PATH}/<library header directory path>"
   )
   	
   list(APPEND SDK_SOURCE_FILES
           "${NRF5_SDK_PATH}/<library source file path>"
   )

After setup you can use cmake as usual:

1. Generate the actual build files (out-of-source builds are strongly recommended):

   cmake -H. -B"cmake-build" -G "Unix Makefiles"
   

   You can optionally pass the toolchain to cmake when configuring:

   -DCMAKE_TOOLCHAIN_PATH=cmake-nRF5x/arm-gcc-toolchain.cmake
   

   but if you do so you must ensure the toolchain binaries are available in your environment PATH (i.e. work on the command line without specifying absolute path)

2. Build your app:

   cmake --build "cmake-build" --target <your project name>
   

In addition to the build target (named like your project) the script adds some support targets:

FLASH_SOFTDEVICE To flash a nRF softdevice to the SoC (typically done only once for each SoC)

cmake --build "cmake-build" --target FLASH_SOFTDEVICE

FLASH_<your project name> To flash your application (this will also rebuild your App first)

cmake --build "cmake-build" --target FLASH_<your project name>

FLASH_ERASE To completely erase the SoC flash

cmake --build "cmake-build" --target FLASH_ERASE

To start the gdb server and RTT terminal, build the target START_JLINK:

cmake --build "cmake-build" --target START_JLINK

MIT for the CMake_nRF5x.cmake file.

Please note that the nRF5x SDK by Nordic Semiconductor is covered by it's own license and shouldn't be re-distributed.