#33 Event-Driven Programming Part-1: GUI example, events, event-loop, run-to-completion, no-blocking
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- Опубликовано: 1 мар 2020
- This lesson starts a new segment of lessons about *event-driven programming*, which is an important stepping stone in understanding modern software of any kind, not just modern embedded programming.
In this lesson, you will learn the main concepts of event-driven programming based on its origins in graphical user interfaces (GUIs), which went mainstream during the personal computer revolution in the 1980s. Specifically, in this lesson, you will see the most important characteristics of event-driven programming exemplified by the original, low-level Win32 API in C, which demonstrates the main concepts of event-driven programming in their simplest and most direct form. With this background, in the following lessons, you will see how these main characteristics of event-driven programming can be applied to real-time embedded systems, such as your TivaC LaunchPad board.
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Resources:
Companion web page for this video course:
www.state-machine.com/quickstart
GitHub repository for projects for this video course:
github.com/QuantumLeaps/moder...
Transcript of this lesson:
www.state-machine.com/course/...
Video Credits:
This lesson uses short clips from the following RUclips videos:
1968 “Mother of All Demos” by SRI’s Doug Engelbart and Team ( • 1968 “Mother of All De... )
Xerox Star 8010 GUI
( • DigiBarn TV: Xerox Sta... )
Music credits:
The background music comes from:
www.bensound.com/royalty-free... 
Наука
NOTE: The source code, as presented in the video, might cause compilation errors with the newer MDK-ARM / uVision toolsets. This is because the underlying compiler in MDK-ARM has been changed to "Compiler-6", while the older "Compiler-5" is considered now obsolete. The updated code that compiles cleanly with "Compiler-6" is available from the companion website at:
www.state-machine.com/video-course
and from GitHub:
github.com/QuantumLeaps/modern-embedded-programming-course
I'm speechless. This is high quality content. This is very practical. You are blessed By God. Please Keep up your amazing work. God Bless You 😊
Big thanks Miro Samek. Please keep going. We love it very much
You are an "embedded hero".
Fantastic video! Short and to the point! Thank you, Dr Samek!
Thank you for uploading such great programming lessons. I hope this will never end ;)
Of course we will join you next time! Best regards, Patrick.
best on internet sir..........cant thank you enough...........
after careful rewatches.
your explanation is very very beautiful.
Thank You very much.
May God guides you the Right pass.
Looking forward part2. This is eyes opening.
These lessons are invaluable.
Thank you for this great lesson! It was very interesting to learn about historical prerequisites for creating event-based programming methods!
thank you the best lesson in embedded programming
Great great lessons Miro. Really appreciate your efforts.
Thankyou mr author, because of your course only I got a job in ge
Clear and superb explanation. Thank you!!!
I am not sure what i should write in comment just to appreciate the amazing work you are putting out here..... Please continue the series.... believe me there is a whole lot generation of aspiring embedded engineers waiting to get this level of quality learning. All the very best man.... Just keep making the videos so that learning can come out of the limits of the text books. :)
Amazing, thanks
what a great lesson !!! Thanks so much !!!!!!!
Really really amazing, as i am learning QM and QEP!
Thanks for this series waiting for next lesson
How Deep you studied this subject I appreciate your work. I studied Charles Petzold win 32 API Book 20 years back when I was learning VC++ this book is necessary to understand MFC Classes. Today software engineers know one knows this subject this much deep
Thank you for this great lesson sir
Thank you so much!
thanks man, keep it up ♥
While all of your tutorial episodes are of great quality, this episode is next level interesting!
Yes, this lesson marks a transition to the "modern" embedded programming, with future lessons exploring the programming paradigms that go beyond the traditional RTOS. Stay tuned! --MMS
Quantum Leaps, LLC looking forward to it!
awesome explanation
Thanks sir keep it up 👏👏👏
Another high-quality lecture. Would it be possible to inform which open source/commercial products use the Quantum Framework?
Hi ! Is Quantum leaps simular to Rhapsody Ibm ?
Quantum Leaps company provides, among others, the QM modeling tool (see www.state-machine.com/qm ), which indeed is similar to IBM Rhapsody. The significant differences are that: (1) QM is freeware while Rhapsody is expensive, and (2) QM is lightweight and "low-ceremony" while Rhapsody is quite heavyweight and "high-ceremony." Of course, QM offers much less functionality than Rhapsody, but QM supports hierarchical state machines (UML statecharts) very well and generates efficient, highly-readable C or C++ code (arguably even *better* than Rhapsody. Finally, the QM code generator is coupled with the QP Real-Time Embedded Frameworks, which are much lightweight than the IBM OXF framework coupled with IBM Rhapshody. In the end, to get an idea what Quantum Leaps offers you should try it (state-machine.com/#Downloads ). All Quantum Leaps software is open source. --MMS
Why is line 67 "MSG msg;" inside the while loop?
It is a good programming practice to define variables in the narrowest possible scope. The temporary variable "msg" is needed only inside the while loop, so it is defined only there. Please note that even the old C89 standard allows defining variables right after every opening brace '{'. --MMS
Can I do the event-driven concept on Raspberry Pi?
Yes, you could. Please watch the video: Running QP Real-Time Frameworks on Embedded Linux (ruclips.net/video/0AaPRMSt2jg/видео.html ). That video uses Raspberry Pi.
great video, but do you mind to upload a higher quality video? this video is full of texts and having 1080p would be nice
This video should be still quite legible when played in the original 720p resolution. But this is one of the last ones at 720p. The newer videos are at 1080p. Please check them out! --MMS
Si può avere in Italiano?
I really liked this video
please help me with this question
Assume 8 LEDs are connected to the ports p1.5-p1.12, write a C code to implement the functionality of the Johnson counter, upon reading key ‘j’ or ‘J’ from the UART terminal, else continuously blink.
Sounds like a homework assignment... Dude, you need to do this yourself!
It is not clear what is application and what is windows system here.
"Application" in this case is the code in the 'hellowin.c' module (left panel in the Visual Studio IDE). "Windows System" is everything else. --MMS
@@StateMachineCOM By using Event driven rogramming we don't need an RTOS, is that true ?
@@benravin6547 This is actually a complex question. Typically RTOS threads are programmed with blocking calls to the RTOS that explicitly wait for selected events. This programming style is called sequential, which is the opposite of event-driven programming. But it is also possible to structure each RTOS task as an event loop discussed in this video. In that case, RTOS can be *combined* with the event-driven paradigm. The benefit of using RTOS like that is having multiple event loops that can *preempt* each other. And this can be very helpful in achieving an excellent *real-time performance* of the system. Event-driven threads structured as event loops are called "Active Objects" and will be discussed in the upcoming lessons of this video course. --MMS
I like your videos very much, may I get your approval to publish them on a Chinese video website?
Yes, please feel free to re-publish the videos and spread the word. The only request is to please *give credit*. Specifically, for each re-published video, please provide the RUclips link to the original video (the RUclips link can be obtained by clicking on the "Share" button under each video.) Thanks a lot! --Miro
@@StateMachineCOM thanks very much，may I add mandarin script to these videos?
@@honggangwei5085 Yes, please add Mandarin translation to the videos. --MMS
why nowadays your videos missing audio music
Several viewer explicitly requested NOT to use any background music, because presumably they find it distracting. It's hard to win here... --MMS
@@StateMachineCOM I've always appreciated the small clips at the intro and conclusion, but please don't add any during the content!