If you are developing an application, for a smooth and quick integration:
- See the developers’ documentation on the Developer Portal
- Go on Discord to chat with developer support and the developer community.
This directory contains the SDK for Nano S, Nano X, Nano S , Stax, and Flex applications development.
It is the unified version of the previous Nano S, Nano X, Nano S SDKs.
As the previous SDKs, this SDK is tightly linked to the Ledger Hardware Wallet OS: BOLOS.
Indeed, it allows to interact with syscalls and cxlib functions which are embedded in the OS.
Hence you should make sure to use the right SDK version matching your development device OS.
You can find below two possibilities to build against the right SDK version.
The easiest way to build against last device OS is to use the docker image provided by ledger and accessible on ghcr.io.
The corresponding GIT repository can be found here. Please have a look at its README.md for information about its usage.
Advanced users that have setup the Ledger development environment can use this repository to build apps.
But for that, they need to understand how OS and SDK compatibility are tracked. This is done with the API_LEVEL which is defined in Makefile.defines.
The API_LEVEL on master branch is kept as the reserved value 0.
For each released OS there is a corresponding tag in the format <Device>_<os_version>, e.g. NanoX_v2.1.0 for the release of the OS version v2.1.0 for Nano X device. While on this tag, if you look at the value of the API_LEVEL which is defined in Makefile.defines you will retrieve the OS API_LEVEL.
There are also API_LEVEL_<N> branches with API_LEVEL value set to N. Their purpose is to allow cherry-picks of bug fixes and improvements that are merged on master so that they are available when building the apps for the corresponding OS.
On these API_LEVEL_<N> branches, there are tags following the format v<N>.<minor>.<patch>, e.g. v1.1.0 where N is the API_LEVEL. These tags are used to generate the SDK_VERSION which is available at compile time and allows to track the SDK version used to build an app.
The branch API_LEVEL_LNS tracks the sdk for the NanoS_v2.1.0. It's naming does not follow the API_LEVEL_<N> format because it is not a child of the branch API_LEVEL_0.
In short, to build an app for an OS, you should:
- Retrieve the OS
API_LEVEL:git checkout <device>_<os_version>grep API_LEVEL Makefile.defines | head -n1
- Check out the
API_LEVEL_<N>branch related to the OSAPI_LEVELand make sure it is up to date:git checkout API_LEVEL_<N>git pull- The last commit should be tagged with the complete version of the SDK (
v<N>.<x>.<y>)
- Build the app from your app folder:
make BOLOS_SDK=<path_to_sdk> TARGET=<target>wheretargetis one ofnanos,nanox,nanos2,stax,flex(nanos2is used for Nano S device).
This list the main API_LEVEL branches with their purposed (corresponding OS) and state if they should still be patched or not (OS not “active” anymore).
The full mapping of API_LEVEL branches, including OS release candidates, is available here.
| Name | Related OS | Active |
|---|---|---|
| LNS | nanos_2.1.0 |
✔️ |
| 1 | nanox_2.1.0 nanos _1.1.0 |
❌ |
| 5 | nanox_2.2.{0, 1, 2, 3} nanos 1.1.1 |
✔️ |
| 8 | stax_1.0.0 | ❌ |
| 10 | stax_1.1.0 | ❌ |
| 11 | stax_1.2.0 stax_1.2.1 |
❌ |
| 13 | stax_1.3.0 | ❌ |
| 15 | stax_1.4.0 | ❌ |
| 18 | nanos _1.2.0 | ✔️ |
| 19 | flex_1.0.0 flex_1.0.1 |
❌ |
| 21 | stax_1.5.0 flex_1.1.0 flex_1.1.1 |
✔️ |
| 22 | stax_1.6.0 flex_1.2.0 |
✔️ |
-
Fetch last changes from remote:
git fetch --all -
Create a new branch to hold your cherry-picks:
git checkout origin/API_LEVEL_X -b mybranch -
Cherry-pick your commits:
git cherry-pick -x commit_sha1(the -x is useful to track the original commit of a cherry-pick). -
Push your branch:
git push origin mybranch -
Create a PR and indicate in it the PR where your cherry-pick where reviewed first.
This repository uses pre-commit to identify simple programming issues at the time of code check-in.
To enable pre-commit in your development environment:
-
Install pre-commit:
pip install pre-commit
-
Add pre-commit hooks
pre-commit install --hook-type pre-commit pre-commit install --hook-type commit-msg
HTML documentation can be generated by typing:
- For Stax:
make doc TARGET=stax
- For Nano X or Nano S :
make doc TARGET=nano
from root directory
The resulting documentation can be found in build/doc/html/index.html
If you have not already installed Doxygen, you can do it (on Linux-Ubuntu) with:
sudo apt-get install doxygen doxygen-doc graphviz