What’s New?
View QP/C Revision History at: https://www.state-machine.com/qpc/history.html
If you’re interested in the latest QP/C version from GitHub, it is recommended that you clone this repo like that:
git clone https://github.com/QuantumLeaps/qpc --recurse-submodules --depth 1
However, the easiest and most recommended way of
getting started with QP/C is to download
the QP-bundle, as described below.
Issue Tacking and Support
This repository does NOT use GitHub Issues for technical support.
Please use the following official support channels hosted on SourceForge:
The QP/QM Free Support Forum has been active for decades — predating GitHub — and provides a searchable archive of answers, troubleshooting guidance, and resolved issues. Posts to this forum benefit the entire community and are typically answered the same day.
About QP/C Real-Time Event Framework
QP/C real-time event framework (RTEF) is a lightweight implementation of
the asynchronous, event-driven Active Object (a.k.a. Actor) model of computation
specifically designed for real-time embedded systems, such as microcontrollers (MCUs).
QP/C is both a software infrastructure for building applications consisting
of Active Objects (Actors) and a runtime environment for executing the Active
Objects in a deterministic, real-time fashion. Additionally, QP/C Framework
supports Hierarchical State Machines with which to specify the behavior of
Active Objects [UML 2.5], [Sutter:10], [ROOM:94]. The QP/C Framework can be
viewed as a modern, asynchronous, and truly event-driven real-time operating
system (RTOS).
State Machines to Code
The behavior of active objects is specified in QP/C by means of
hierarchical state machines (UML statecharts). The framework supports manual
coding of UML state machines in C as well as fully automatic code generation using
the free graphical QM model-based design (MBD) tool.
QP Framework Family
QP/C framework is part of the larger QP family, consisting of the following
QP editions (please also see QP Frameworks Feature Comparison
):
The SafeQP/C and SafeQP/C++ frameworks were originally derived from QP/C and QP/C++,
respectively, but were extensively reengineered for the safety market using compliant
Software Safety Lifecycle (SSL). In this process, the QP framework functional model has been
subjected to a full Hazard and Risk Analysis, which identified all areas of weakness within
the functional model and API. These findings led to the creation of Safety Requirements and risk
mitigation by Safety Functions, which were subsequently implemented, verified, and validated.
The SafeQP frameworks are accompanied by the “SafeQP Certification Kits”, which provide
developers with ready-to-use artifacts, enabling them to save time, mitigate risk, and reduce
costs during application certification for safety-critical devices in the industrial, medical,
aerospace, and automotive industries. Please contact Quantum Leaps
for more information about the SafeQP frameworks and the “Certification Kits”.
[!NOTE]
The SafeQP/C edition remains fully API- and functionally compatible with the
corresponding standard QP/C framework. This ensures existing QP/C Applications can transition
seamlessly to SafeQP/C without requiring any modifications. SafeQP/C edition retains QP/C
Frameworks’ hallmark features: a small memory footprint, excellent efficiency, and hard
real-time performance.
Getting Started with QP/C
The most recommended way to get started with QP/C is by
downloading the QP-bundle,
which includes QP/C as well as the QM modeling tool and the
QTools collection. The main advantage of obtaining QP/C bundled
together is that you get all components, tools, and examples all ready to go.
[!TIP]
Perhaps the most important fact to remember is that in embedded systems,
nothing works until everything works. This means that you should always start
with a working system and gradually evolve it, changing one thing at a time
and making sure that it keeps working every step of the way.
The provided QP/C example projects, such as the super-simple
Blinky, or a bit more advanced
Dining Philosophers Problem (DPP),
allow you to get started with a working project rather than starting from
scratch. You should also always try one of the unmodified examples on one
of the very inexpensive evaluation boards (such as
STM32 NUCLEO-U545RE)
that it was designed for, before attempting to immediately adapt the projects
to your specific hardware. Only once an example project is built and runs on
the evaluation board, can you use it as a starting point for your specific hardware
and software development.
Getting Started Resources
The open source GPL distribution of QP/C can be augmented by the
“QP/C Extras”, which provide more advanced QP/C features, such as:
[!NOTE]
The “QP/C Extras” are licensed commercially only
and available to the commercial licensees with the active Support Term. Please contact
Quantum Leaps technical support to get the matching “QP/C Extras”
for the public QP/C version.
[!NOTE]
The “QP/C Extras” are also available for evaluation
(upon request).
Licensing
The QP/C real-time event framework is licensed under the
dual licensing model, with
the following licensing options:
- Open-source licensing under the
GNU General Public License (GPLv3).
[!NOTE]
The GPL requires that all modifications to the original code
as well as your application code (Derivative Works as defined in the
Copyright Law) must also be released under the terms of the GPL
open source license.
- Closed-source licensing under one of
Quantum Leaps commercial licenses,
which are specifically designed for users interested in retaining the
proprietary status of their code.
[!NOTE]
If your company has a policy forbidding open source in your product,
all QP frameworks can be licensed commercially, in which case you don’t use
any open source license and you do not violate your policy.
[!NOTE]
The SafeQP frameworks and the accompanying “Certification Kits”
are licensed commercially only.
Documentation
The online HTML documentation for the latest version of QP/C is located
at: https://www.state-machine.com/qpc
The offline HTML documentation for this particular version of QP/C
is located in the sub-folder html (included in the QP/C releases).
To view the offline documentation, open the file html/index.html
in your web browser.
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