Ulrich Mohr
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automation | ||
contrib | ||
doc | ||
hal | ||
misc | ||
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src | ||
tests | ||
.gitignore | ||
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CHANGELOG | ||
CMakeLists.txt | ||
LICENSE | ||
NOTICE | ||
README.md |
Flight Software Framework (FSFW)
The Flight Software Framework is a C++ Object Oriented Framework for unmanned, automated systems like Satellites.
The initial version of the Flight Software Framework was developed during the Flying Laptop Project by the University of Stuttgart in cooperation with Airbus Defence and Space GmbH.
Quick facts
The framework is designed for systems, which communicate with external devices, perform control loops, receive telecommands and send telemetry, and need to maintain a high level of availability. Therefore, a mode and health system provides control over the states of the software and the controlled devices. In addition, a simple mechanism of event based fault detection, isolation and recovery is implemented as well.
The FSFW provides abstraction layers for operating systems to provide a uniform operating system abstraction layer (OSAL). Some components of this OSAL are required internally by the FSFW but is also very useful for developers to implement the same application logic on different operating systems with a uniform interface.
Currently, the FSFW provides the following OSALs:
- Linux
- Host
- FreeRTOS
- RTEMS
The recommended hardware is a microprocessor with more than 1 MB of RAM and 1 MB of non-volatile
memory. For reference, current applications use a Cobham Gaisler UT699 (LEON3FT), a
ISISPACE IOBC or a Zynq-7020 SoC. The fsfw
was also successfully run on the
STM32H743ZI-Nucleo board and on a Raspberry Pi and is currently running on the active
satellite mission Flying Laptop.
Getting started
The Hosted FSFW example provides a good starting point and a demo to see the FSFW capabilities. It is recommended to get started by building and playing around with the demo application. There are also other examples provided for all OSALs using the popular embedded platforms Raspberry Pi, Beagle Bone Black and STM32H7.
Generally, the FSFW is included in a project by providing
a configuration folder, building the static library and linking against it.
There are some functions like printChar
which are different depending on the target architecture
and need to be implemented by the mission developer.
A template configuration folder was provided and can be copied into the project root to have a starting point. The configuration section provides more specific information about the possible options.
Adding the library
The following steps show how to add and use FSFW components. It is still recommended to try out the example mentioned above to get started, but the following steps show how to add and link against the FSFW library in general.
-
Add this repository as a submodule
git submodule add https://egit.irs.uni-stuttgart.de/fsfw/fsfw.git fsfw
-
Add the following directive inside the uppermost
CMakeLists.txt
file of your projectadd_subdirectory(fsfw)
-
Make sure to provide a configuration folder and supply the path to that folder with the
FSFW_CONFIG_PATH
CMake variable from the uppermostCMakeLists.txt
file. It is also necessary to provide theprintChar
function. You can find an example implementation for a hosted build here. -
Link against the FSFW library
target_link_libraries(<YourProjectName> PRIVATE fsfw)
-
It should now be possible use the FSFW as a static library from the user code.
Building the unittests
The FSFW also has unittests which use the Catch2 library.
These are built by setting the CMake option FSFW_BUILD_UNITTESTS
to ON
or TRUE
from your project CMakeLists.txt
file or from the command line.
The fsfw-tests binary will be built as part of the static library and dropped alongside it.
If the unittests are built, the library and the tests will be built with coverage information by
default. This can be disabled by setting the FSFW_TESTS_COV_GEN
option to OFF
or FALSE
.
You can use the following commands inside the fsfw
folder to set up the build system
mkdir build-Unittest && cd build-Unittest
cmake -DFSFW_BUILD_UNITTESTS=ON -DFSFW_OSAL=host ..
You can also use -DFSFW_OSAL=linux
on Linux systems.
Coverage data in HTML format can be generated using the CodeCoverage
CMake module.
To build the unittests, run them and then generare the coverage data in this format,
the following command can be used inside the build directory after the build system was set up
cmake --build . -- fsfw-tests_coverage -j
The coverage.py
script located in the script
folder can also be used to do this conveniently.
Index
1. High-level overview
2. Core components
3. Configuration
4. OSAL overview
5. PUS services
6. Device Handler overview
7. Controller overview
8. Local Data Pools