Clone this repository and update submodules.

$ git clone --recursive https://github.com/sonydevworld/spresense.git

After repositories have been cloned, each submodule is in 'Detached HEAD' state. Master branch have to be checked out before you can start developing.

$ git submodule foreach git checkout master

.
├── examples  - Spresense SDK examples
├── nuttx     - NuttX original kernel source + CXD5602 port.
└── sdk       - Spresense SDK source and PC tools.

A pre-compiled docker container is available with all the pre-requisite that is needed in order to build the Spresense SDK.

In order to start using it simply type:

$ source spresense_env.sh

This script will create an alias spresense which should preceed the regular SDK build scripts and Make commands. examples

SpresenseSDK: $ spresense make

Install the necessary packages and GCC ARM toolchain for cross-compilation.

$ sudo apt-get install git gperf libncurses5-dev flex bison gcc-arm-none-eabi

Install the kconfig-frontends package from nuttx-tools.

$ git clone -n https://[email protected]/nuttx/tools.git tools
$ cd tools
$ git config core.autocrlf false
$ git checkout 891510d2534287afef6b5c90a375f94442a7e94d
$ cd kconfig-frontends/
$ ./configure
$ make
$ sudo make install
$ sudo ldconfig

Go to the folder where you cloned the {SDK_FULL}, and enter the sdk folder name:

$ cd spresense/sdk

Set up the nuttx kernel configuration

$ tools/config.py --kernel release

Set up the SDK configuration

$ tools/config.py examples/hello

Build the example image:

$ make buildkernel
$ make

A nuttx.spk file appears in the sdk folder when this step has successfully finished. This file is the final result and can be flashed into the your board.