This directory contains examples that illustrate the "Dual Targeting" approach to developing embedded software. Specifically, the examples run on Windows GUI, but large portions of the code are actually for deeply embedded boards.
When developing embedded code for devices of any time, but especially with non-trivial user interfaces, it often pays off to build a prototype (virtual prototype) of the embedded system on a PC. The strategy is called "dual targeting", because you develop software on one machine (e.g., Windows PC) and run it on a deeply embedded target, as well as on the PC. Dual targeting is the main strategy for avoiding the "target system bottleneck" in the agile embedded software development.
NOTE Please note that dual targeting does not mean that the embedded device has anything to do with the PC or Windows. Neither it means that the simulation must be cycle-exact with the embedded target CPU. Instead, dual targeting simply means that from day one, your embedded code (typically in C or C++) is designed to run on at least two platforms: the final target hardware and your PC. All you really need for this is two C/C++ compilers: one for the PC and another for the embedded device.
QWin is a free GUI toolkit for prototyping embedded systems on Windows in the C or C++ programming language, including building realistic embedded front panels consisting of LCD displays (both graphic and segmented), LEDs, buttons, knobs, sliders, etc. The implementation is based on the raw Win32 API to provide simple direct mapping to C/C++ for easy integration with your embedded code.
NOTE The problem of building GUI prototypes of embedded devices on the desktop is very common, yet it seems that most developers try to use C#, .NET, VisualBasic or other such environments to build prototypes of their embedded devices. The main shortcoming of all such solutions is that they don't provide direct binding to C/C++, which complicates the build process and the debugging of the C/C++ code on the host.
QWin is included in the QP/C and QP/C++ frameworks (in the <qp>\ports\win32
and <qp>\ports\win32-qv directories), where <qp> stands for the
installation directory of the qpc or the qpcpp framework.
from the QTools Collection.
Currently QWin provides the following facilities:
- Graphic displays (pixel-addressable) such as graphical LCDs, OLEDs, etc. with up to 24-bit color
- Segmented displays such as segment LCDs, and segment LEDs with generic, custom bitmaps for the segments.
- Owner-drawn buttons with custom "depressed" and "released" bitmaps and capable of generating separate events when depressed and when released.
Additionally, the provided code shows how to handle input sources:
- Keyboard events
- Mouse move events and mouse-wheel events
QWin GUI Prototyping Toolkit is described in the pplication Note: QWIN GUI Kit for Prototyping Embedded Systems on Windows.
AppNote: QWIN GUI Kit for Prototyping Embedded Systems
The QWin is licensed under the permissive MIT license
(see top-level comments in the files qwin_gui.h and qwin_gui.c)