ฝัง
- เผยแพร่เมื่อ 3 พ.ย. 2017
- The new ESP32 has three cores. Two of them are very fast; the third is ultra-low power. The Arduino IDE typically only uses one of the fast cores. Today:
- We will take full advantage of the second core of the ESP32
- We will test if it really increases the capacity of our microprocessor
- We will also compare its dual-core speed with the speed of an Arduino UNO
- We will try to synchronize tasks, even if they run on two different cores
- We will also try to use the same data on both cores
- These two mechanisms are mandatory if you want to use the two cores in a productive fashion
- And we will not leave the Arduino IDE. Promised
Links:
Sketches: github.com/SensorsIot/ESP32-D...
Base for my video: techtutorialsx.com/2017/05/06...
About Semaphores: exploreembedded.com/wiki/RTOS...
Some ESP32 boards from my last mailbag video:
ESP32 TTGO/OLED/Battery: bit.ly/2yQJQCf
X-Shields set ESP32: s.click.aliexpress.com/e/QNrFQNR
HiGrow: bit.ly/2yR8cf2
Geekcreit ESP32 Doit V1: bit.ly/2sOMR3E
LOLIN32 LITE (Micropython): bit.ly/2yI03dc
Geekworm ESP32: bit.ly/2yQ6Np1
ESP32 Dev Board: bit.ly/2yPohSp
Supporting Material and Blog Page: www.sensorsiot.org
Github: www.github.com/sensorsiot
If you want to support the channel and buy from Banggood use this link to start your shopping: bit.ly/2jAQEf4 (no additional charges for you)
Official Wemos Store: s.click.aliexpress.com/e/jUzBiIq
profile.php?...
/ spiessa
www.instructables.com/member/...
Please do not try to Email me or invite me on LinkedIn. These communication channels are reserved for my main job
If you want to buy me a coffee: www.paypal.me/AndreasSpiess - วิทยาศาสตร์และเทคโนโลยี
Maestro, the quality of this video exceeds even your usual high standard. Superb job sir!
Thank you for your nice words!
RIP arduino. We had a good run
HOLY CRAP!!!! Brilliant! This is going to to be one of your most classic videos Andreas!
I hope so ;-) Thanks for your compliment!
This is one of the coolest videos you have ever made in my opinion! Great job!
I was astonished about the reactions on this video. I thought, it is too hardcore for TH-cam and expected only a few viewers...
As always.. to the point and amazing... Always learning new thing with your videos... You are a blessing Andreas.. 😀
Thank you!
I agree
Great video as always! :-) Thanks for keeping your videos still simple, straight forward and easy to understand (e.g. using Arduino IDE), instead of getting more and more theoretically. This really is an outstanding advantage of your videos, if I compare it to other electronic channels. Your channel is way more valuable for me than any other...
Sometimes I think, my content is too complicated (for example for this video). But then, the feedback seems to be ok...
At least for me it's perfect :-)
Wasn't too complicated at all Andreas, fantastic job explaining it quickly and concisely. I wrote Hackster's article on "Multithreading" an Arduino. I might have to write one for ESP32 now and reference your video!
@@AndreasSpiess No, this is great! Your balance is for me perfect, and with the great advantage (compared to many TH-camrs) is your stringent editing where you do not waist words/time. Pausing and looping back in a video is so much better than fast forwarding to get past blablabla!
I am a proud to be a Patreon supporter, and I just bought you a coffee as a special thank you for this video. (I am finally about to transit from ESP8266 to ESP32, and your videos is the obvious starting point.)
Hi Andreas! Thanks for the great quality videos. I have a mechanical engineering background and I am moving my first steps towards mechatronics as an hobby and your material has high educational value to me! Thanks for sharing!
I tried the other way round when I bought my milling machine. It was hard for me ;-)
Great video, as always! I'm still using the 8266 everywhere, but videos like this are really encouraging! I'll make the switch eventually!
I also use the ESP8266 for normal jobs, because I still have a few laying around...
One of your best videos to date, Andreas. I expected you to achieve asynchronous tasks, but explaining semaphores and using them to achieve synchronous (procedural) execution, and the persistence of global variables across cores was an added bonus I wasn't expecting. Fantastic work, thank you and keep it up!
Thank you for your feedback. I think, without semaphores, two cores are not very useful ;-)
You are right.
Hello Andreas! First I need to say that I enjoy all of your videos due to your skill in explaining the concepts involved and walking us through your engineering based approach. I am very interested in the ESP 32 however and really enjoyed this example on how to utilize the three cores and learn the basics of RTOS! I didn’t even realize Freertos was ported to the ESP 32. So useful to me, can’t wait to try it on my own devices. Time for me to become a patron!As always keep up the interesting work on all the things you are interested in.
Thank you for your nice comment. So far, I am not on Patreon. But this might change if I cross the 50'000 subscribers...
For the main loop(), "vTaskDelete(NULL); " I believe is a good solution - it will immediately stop execution of the "main" thread. You could even use it at the end of setup() to never enter loop()
Thank you for the tip!
at 4:42 , isn't that delay(1000) supposed to increase time instead of decreasing it? since the void loop() also is getting exceuted..
@@RakshithPrakash I think that RTOS handles this and does other stuff while the loop is in the delay
@@sasodoma Thats what appears to happen, but it would be better as mentioned above to just stop the loop entirely
Bravo. I feel much indebted to your brilliant and most useful take on low-end microcontrollers. It is helping me with a lot of DSP applications.
Glad to be able to help.
If anyone gets bootloop with message: 'Debug exception reason: Stack canary watchpoint triggered esp32 core..." make sure you increase the stack (the 1000 in task init), 8192 worked for me. This 5 year old article was a great guide. Thanks Andreas.
Thanks for the additional information!
This is fantastic! I've already forwarded this link on to friends (even though it's two in the morning here)! I'm also creating a dual-threaded process where one core monitors sensors and the other does display and uploading of data (which are passed via global scope variables). This is absolutely great, Andreas! I will henceforth use your framework for all my ESP32 projects!
+Philip Moyer Please come back with your learnings. This is still new technology.
It works! I created a typedef struct definition and instantiated a global scope variable - this is used to transfer data between cores. Core 0 polls an attached SI7021 temperature and humidity sensor, loads the data into the global scope variable, and then delay()s to control the timing. Core 1 reads the data buffer struct, displays the data on an OLED, and then uploads the data to adafruit.io (which is Adafruit's IoT/cloud offering.) Works like a charm! I couldn't have done it without your guidance, though! [Oh, and this is running on the Adafruit ESP32 Feather.]
Thanks for the update. Cool!
Oops. I take that partially back. It works for a while, and then produces nonsense data, and then stops working altogether. Debug time!
+Philip Moyer As I mentioned: I also had some issues to solve....
Brilliant work! You've excelled yourself in this video Andreas! Well done.
Thank you! I was not sure when I did the video. The stuff is quite complicated...
This is the first of your videos I saw. I am very well impressed about it. Congratulations and Thank you very much
Welcome to the channel!
Hi Andreas, what amazing explanations and examples you did!
Congratulations from Brazil!
Thank you!
The guy with the Swiss accent is kicking some serious ass -- great job!
:-)
Thanks a lot Andreas for this amazing introduction. Great tutorial, as usual.
You are welcome!
Why all of your video always come when i need it the most😍
Truly magical~
God Bless you Mr. Andreas
Thank oyu! But this one is quite old ;-) So it came too early.
Fast, to the point, very didactic and very entertaining. You belong in the hall of fame of youtube of engineering Andreas. Cheers
Thank you for your nice words!
GREAT tutorial Andreas !!!! Thanks !
This will move some people to the right direction (including myself)
Hope to see more dual core tutorials from you
Awesome !
Thank you! We will see where these possibilities lead us...
Andreas, you're a TRUE star (complete with your ubiquitous 'Swiss Accent').
I always enjoy your videos.
I haven't yet done anything much with ESP32 boards as I've tended to concentrate more effort on ARM based SBCs (OLinuxuinos, Beagle, OrangePi, BananaPi, RaspPi etc), but my soldering iron is beginning to show 'twitching' signs of neglect.
As soon as I can muster up some form of project to suit it, I'm sure I'll have the flux flowing...
Thanx dude (from a guy with a Kiwi Accent... LOL)
Never visited your country so far... Maybe I can change that when I stop working. I strongly suggest you try this part of electronics. It enhances the useability of the part you are using now.
Andreas you are brilliant because you every time i have a question you answer it in your videos like you are sitting in my head :) so thank you very much.
You are welcome! These are maybe common wishes?
@@AndreasSpiess Yes i think so :)
Another great video Mr. Spiess. I'll be rewatching and following along with my esp32 😊
Thank you!
Awesome episode on a very interesting and powerfull topic! Thank you very much, Andreas!
You are welcome!
I'm stunned by the perfection of this content
Thank you!
Happy Sunday Morning Andreas 😀😀😀😀😀
Another very welcome addition to the ESP32, dual cores, cooooool.
Still very much enjoying your new format😀
Your the magician that shows us all the tricks ✅
Bravo ✌️
If I would be a real magician, I probably would not show you the tricks. Would be bad for business ;-)
Andreas Spiess your the best, you show all your apprentices how to wave a magic wand🤗
:-)
This video is great!! and quite useful to get the most from the ESP32!
Thank you!
This is probably most useful and important video about programming ESP32 I've seen.
I also like this concept of tasks.
Awesome! Thank you for you very systematic videos. Much appreciated. Long time fan :)
Thank you for your feedback!
You make the best and most informative content on TH-cam. A good diversion from all the cat videos... :)
Even if on some of my videos our cat appears ;-) Thank you!
Thanks for the video Andreas, lots of great info.
I got a MAX7219 Led Matrix display being scrolled on one core (using a task, core 0) while the other core fetched the data (just using the loop). It's great because you can now scroll without any interruption!
Thanks for the feedback! Interesting. So it works!
Yup! I had it running for maybe 30 mins or so and it was working fine (I know not a conclusive test, but promising for sure!)
SO much great info in this video! Thanks, as always, for sharing with us!
You are welcome!
Absolutely brilliant. Thanks for opening some more doors into the world of the ESP32.
Thank you for your nice words! We will see what we can do with these new possibilities...
I don't know how you and others like Great Scott, Kevin Darrah upload content which is just so relevant to my current studies. I swear, a couple of times, I've been scouring the web for something I've wanted to learn, and then POOF : A video by one of you to help me with exactly that. I've had to pinch myself, if I'm being honest. Oh and before I forget, YES, I AM studying RTOS right now! For the ARM7 processors, though. All hail TH-cam and people like you!
Glad to be of help. I also learn a lot through TH-cam!
I was thinking the same thing. I just got the itch to explore ESP32 bluetooth again and Andreas posted a video the day before!
Well what can I say, great as always. Looking forward to some Christmas themed videos.
We will see if I find the time...
Wow - totally cool! Thanks, Andreas, I had no idea that it was possible to access the two cores as simply as this. Fun playtimes ahead! Regards, David (UK)
I also discovered this possibility quite late.
Andreas one of your best videos you have ever done. This is a fantastic video my hat is of to you sir.
Thanks. I was not convinced when I published this one because the topic is quite complicated...
Thank's for your videos Andreas! Really enjoy them, very good info.
Now i really must buy an ESP32 board.
You are welcome!
Outstanding!! Such a helpful illustration. Thank you.
You are welcome!
Dear Maestro, thanks for this great, great video! It is fantastic! Saludos from the south of the world! ;-)
You are welcome!
I've been a firmware engineer for a considerable time now, and I have some very good experience with FreeRTOS, semaphores, and IPC in general. This opens up a whole new world for me with the ESP32 boards, and since winter is coming, I very much want to play.
Thank you kind sir.
Enjoy! I am sure this is a new dimension for Makers...
Awesome video it truly is a different animal the pwm change still gets me I guess I'm use to the original approach but one does get use to the change
Thank you!
This is really really interesting! I'm now working in Arduino/AVR worlds and still there's a lot to learn in AVR programming. I also have ESP8266 modules that haven't work with until now, moving to this new ESP32 is a huge improvement for me.
And the Wi-Fi connection opens a whole new world of possibilities...
@@AndreasSpiess wow I'm just imagining that new world 😊 now I just to write my C library of the nrf24l01. But with the ESP modules, the WiFi is built-in so that's more juice. I know it won't be easy to work with the nrf24l01 modules. But the work you do in calibration and testing modules is so much interesting.
Great break down of how the ESP32 Dual Cores actually work. Thanks for making me smarter quicker!
Glad to help!
Hi Andreas, Awesome video! .. as always.... You describe it correct, that you have to use semaphores to protect access to shared variables, but in your code I think you use it *outside* of the protected block. counter++ should be inside that block. Otherwise you can introduce very very hard to find errors, especially in more complex scenarios. The synchronization of the starting point of the tasks itself does not neccessary fulfil that!
Luckily the blink delay is different by 200ms, so the increment are never at the same time. But you're right: counter++ should be between the take and give...
I second this; nobody likes to search for those "heisenbugs" that this could lead to.
+Walter Steinchen I know the problem but not the solution in this scenario (how to define protected variables). However I think, using semaphores can be used to prevent a double update. But I am still looking for a definition like "volatile"
Andreas, excellent video, but access to the global variable isn't exactly being controlled by the semaphore. At least not the way the video explains it. In the code it seems more like a side effect rather than proper handling. As long as folks know that more work needs to be done on the subject they can resolve the 'heisenbugs' (I like that name).
+Neil Cherry Msxbe the solution is already there and I only do not know it...
Hi, a very interesting video,
I never thought that this was possible on the ESP32
Keep on making such video's!!
I knew it is possible, but not using the Arduino IDE...
I learnt something today :). It would be good one day to have some kind of beginners masterclass for code architecture in this wonderful new world to reduce blocking and waiting. I'm sure some design patterns will be tidier than others!
We will see where these new possibilities lead us...
Excellent video once again. I have been using ESP8266 modules commercially since the documentation was only in Chinese and personally experienced the frustration that the community was going through where the background WiFi functionality was causing delays and inconsistency in certain routines, especially ones that used PWM. In response to this Espressif came up with the idea to add a second core to do all this stuff while the first was left alone to do reliable networking. This was deliberate and hence the ESP32 solved many problems that we had to learn to work around on the ESP8266.
I think that this needs to be kept in mind when assigning tasks to Core0 and only short, non-essential code should be used there.
That being said. Thanks for expanding our knowledge with handy, practical tips.
Cheers.
Another viewer did some testing and wrote, that Wi-Fi runs on core 1. Do you know more?
Thanks for your reply Andreas. No I don't know more. I think you are much more up to date with the ESP32 than I am. I am simply stating the historical basis for the second core and went by what Espressif were saying at the time. I was unaware that the new Arduino interface for the ESP32 was layered on top of RTOS. If the default for WiFi and user-defined are both core 1 then that would kind of defeat the purpose of the second core unless RTOS has already taken the balancing of tasks into account.
Grüezi aus dem Aargau. Late to the party, but I just stumbled on this topic. Comes handyfor my next project!
Good to know. Hope it helps!
HI Andreas! What a coincidence that you covered RTOS as I was just starting to play with RTOS on the Arduino Mega (because I ran out of memory on the Nano) for my ping pong led cube. Now that I learned from you that the ESP32 supports RTOS and I won't have to leave the comfort of the Arduino IDE, I certainly would use the ESP32 instead of the Mega. Thanks Andreas! Great content as usual!
I definitively would go for the ESP32 if it has enough pins for your application because it is much faster than a Mega and I think, also more memory. And maybe you can remotely control your cube?
IoT LED Cubes! Sounds awesome.
Hari Wiguna be careful if you want to use digitalWrite though - the ESP32 can be slower than the classic Arduino, or at least not as fast as one thinks. I might have learned that in one of Andreas's videos.
afaik our beloved ESP8266 also uses FreeRTOS for its sdk ;-)
The question that comes to mind here is. What am I going to do with all the Arduino boards I have, nano, Uno, Mega.....
Dude, your content is priceless!! Thank you
You are welcome!
Tight video, clear and to the point. I like that you don't confuse us with race condition.
Thanks!
very good, ESP 32 is becoming the workhorse of IOT.
I can't wait to see what Expressif's next big thing is ------ ESP 64 maybe ?????? That'd be nice :-)
+Roy: I think, I have enough to do to learn how to work with what we have with the ESP32 ;-)
Great video. I must say though that I’m getting more into programming the ESP32 in eclipse using FreeRtos and Its very nice. You get to use tasks like you did but with autocomplete
Good to know. So far I did not try this route...
I'm thinking about putting a course together that will go over this. I'll keep you posted on my progress
Hi Andreas, Great video as always. You are the master!
Thank you!
Absolutely excellent Content presented at a comfortable rate. Thank you very very much.
Thank you for your feedback!
Fantastic video! Extremely clear examples.
Glad you think so!
Excellent video!
I used it and it's working fine. Core_0 to manage wifi, RTC and automation and Core_1 to manage Telegram Bot messages (chat bot). Although I had to change the _Stack size of task_ from 1000 to 8192, to stop getting _stack canary watchpoint triggered_ error.
Thanks for your feedback. It is encouraging to see that it works...
Please give me a hint how you did this to solve the same issue... Thanks
Can you be more specific?
The most useful tutorial I've ever run into.
Good work...
But I was wondering about what we can do for the watchdog timer and how to solve its errors...
Big thumbs up 👍👍
Thank you! We will see in the future...
No way I will digg Up My old Uno now. Love the videos
Thank you!
I really got into using the ESP32 for wifi radio. I have built several versions now, all based on the little powerhouse. My latest are now being built into old amps for apple phones and iPads.. I have been locating the 5 volts inside and building the units inside the case, hook them up so the aux will switch them on. They play wonderfully, I left off the ability to change stations locally and still use my cell phone for tuning in the channels should I ever wish to listen to something. I picked up a couple of different brands of these devices 2 of the 3 that I have had room inside to stuff the ESP and the decoder. To protect the ESP inside the case I soldered all the wires then used a heavy duty heat shrink tube to cover it and shrink it down . This way there is little chance o it shorting out
Sounds like this project is getting better and better!
@Andreas Spiess... : You are Rocking man... This is Super Practical Video...
Thank you!
Excellent video! Really good stuff here!
Thank you!
Andreas this is amazing! Keep it up!! :D
Thank you!
This is really very useful .
Thanks for sharing knowledge .
You are welcome!
Andreas, eres un súper mega chingón!!!! Esta información es muy útil. Muchas gracias por compartir, eres un mega máster. Te mando un cordial saludo desde la ciudad de México!!!! Un abrazo!!!! Víctor Murcio Mansilla
Gracias!
this is sooo exciting... i just got an esp32 now it is time for my little r&d hobby stuff...:/ thanks loads...:)
Have fun!
Master!!! Master!!! I learn a lot with your videos Andreas! Dankeschön!
Bitteschön!
Love this. Using this on my LED clock - bought 0.8" LED display and the core0 just refreshes the display, core1 does the logic. All of it is done using 1 ESP32, 4 resistors (100ohm) and 1 LED display.
Btw, I had a watchdog problem with core0 in Arduino.
I had to add these 3 lines to the for(;;) loop:
TIMERG0.wdt_wprotect=TIMG_WDT_WKEY_VALUE;
TIMERG0.wdt_feed=1;
TIMERG0.wdt_wprotect=0;
Thank you for the information! Good to know.
Incredibly interesting video!
Thanks again Andreas
You are welcome!
Great job. Now I more interested to buy an ESP32 board. Thank you for all good videos you making.
You are welcome!
Great video, Very interesting thanks for your effeorts. It is very useful.
Glad you like it!
Thank you Andreas! So far, Espressif is very responsive to bug reports against the Arduino IDE core, but the esp-idf is Espressif's preferred development framework. Problems get solved on esp-idf first. For example, Bluetooth works very well from esp-idf. Bluetooth didn't work at all from Arduino last time I tried.
You are right. But for the moment, most of my viewers want to stay with the Arduino IDE. So, we have to take what we get (and create some push on Espressif by using their chips).
Agreed, thank you for sticking with Arduino for these types of things. It is much more accessible than ESP-IDF for now.
Super useful info again, thanks Andreas!
You are welcome!
I've just remembered that I did some work on parallel programming for control some years ago. I found that in many simpler applications, there was no need for software synchronisation (e.g. via semaphores); the synchronisation came via sensor feedback in the real world. That means that there are many practical applications one can code up for twin cores without having to use semaphores at all. Hope that's helpful, regards, David
Thanks for the tip!
I'll second that - in spades. If you really have a good understanding of what you're doing - or can "be the computer(s)" in your head, oftentimes you don't need to block on semaphores or mutexes or even spin-busy on a shared boolean. My outfit wrote quite a bit of "very high 9's" software for some telecom manufs using this trick - and some of it hasn't crashed since started in the 1990s. But! You'd better darn well comment in unmistakable ways "the wires that aren't there because they don't need to be" - why you can do this without all those moving parts. Because someday, someone else is going to touch that code and since it looks easy - will not bother to undertake a full understanding, and that's when your phone rings at 3 am...Of course, that other person might be future you who has forgotten the plan. But it's still worth it - even though they take awhile to type - comments run VERY FAST! They also don't take up a lot of space in the runtime(!).
Thanks this video is very useful, appreciates your work
You are welcome!
Really amazing sir, I hope more informative videos like that.
Thanks!
almost 5 years later, still an excellent video. 2 comments: (1) changing the counter on both tasks can cause a collision. I would recommend adding it to the semaphore stage, so it is guaranteed to be safe. (2) Why using delay() function? this is bad practice, especially when interrupts are used. I recommend use the millis() command.
The delay in this scenario is ok because it is handled by RTOS. I agree with the semaphore.
Thanks for that great video, really helped me a lot in a project :)
I would also be interested in some information how to switch the second core (and other sub modules I don't need) completely off to save more energy and how to set the clock frequency of a core.
Cheers!
I had to reduce the speed in one of my videos. It is possible. I do not know if you can switch a core off. Video #161
Awesome thank you! This will help with my current project I will have one core listening for bluetooth instructions and the main core runs the main block of code. As an aside, anyone who listens to the amp hour podcast should remember a few episodes ago the talked to Jeroen Domburg who now works at espressif who told us that it runs freertos and is multi core...although looking it up I know realize that was actually not that long ago but anyway yea...
Good luck with your project. Seems to run not only at the "Leading edge" but probably at the "bleeding edge"...
Well, this solves a problem of mine. Excellent Andreas.
:-)
👏👏👏👏👏 Outstanding! Thank you for this excellent video tutorial!
Peter S - lol Peter S! I did not expect to find you on this side of the internet!
it's funny how we're both interested in politics and electronics 😄
P.S. your profile picture is easy to notice 😂
Hello Daniel, I'm an EE who designs and manufactures building automation gear and I've been a hopeless nerd since the early 1970s. My computing career started on IBM punch-cards which were legacy at the time but still in common useage around Silicon Valley, where I grew up. Previously I was director of engineering for a $200M/yr Macintosh peripheral manufacturer where I was designing and building Thunderbolt II / USB 3.0 RAID enclosures most of the week but that got old because I was working for a hardcore conservative CEO/owner with 200+ conservative employees and had to live in conservative Texas. I am a San Francisco Hippy and Texas is not my thing even if BBQ is some of the best food in the world and their craft beer is amazing. His mother was dying of stage 4 cancer after surviving cancer twice before and I introduced him to the data about cannabis killing cancer cells without harming healthy ones. Her doctors had given up and left her for dead but he confirmed the data I gave him and she started cannabis flower extract oil treatment. She went from terminally ill to cancer free within 18 months and I permanently shook my CEO's faith in conservative thinking. When I quit the guy had removed cannabis from his company drug testing and he supported gay marriage while his wife was still an obvious bigot. He told me he was pissed off that he had been lied to by the people who taught him his conservative values. It took the hopelessness of his mother's mortality for him to finally realize this. His wife even asked him if he was becoming a liberal after I had worked on him for a year. That opened the door for him to start telling other conservative people that they had been programmed by lies and he told me he has since spread his story to well over 100 other medium to large corporate CEO types. I'll also add that I've been a very vocal proponent of medical cannabis for over 20 years with a couple years of tabling at events for TexasNORML where I performed outreach using a large base of peer reviewed data to back my arguments and I am most likely the first person in the Western Hemisphere to put bar codes on retail cannabis which happened at a San Francisco dispensary I wrote the point of sale system for back in 1999. So anyway... now you have a better idea of who I am than 99.9% of the people on the political channels. I'm not a big fan of politics but they affect me and I must do what I can to better all people. I'm far more interested in research concerning the endocannabinoid system, embedded processing, and mountain biking. Best wishes, -Peter
Peter S - Wow, That's an amazing background story :D
I really don't have much to tell, I'm a 22 year old guy that has been programing videogames on game maker since I was 13. Graduated from one of the best engineering high-schools in Mexico with my own developed wireless comunication (like Bluetooth) system and then came to the US (legally) to finish my degree.
I currently finished developing a text based operating system on my own. Now I'm integrating it into any microcontroller that can handle the code. (an arduino uno or better)
The proof of concept is in my smartwatch based on the esp32 (if your interested, I could make a video presenting showing my operating system working and explaining the impact this could have in the WHOLE microcontroller industry). I'm planing to show it at some fancy company and get hired in any development type area. I am struggling to get the first step because I lack of any contacts that can hook me up.
+ Peter S: I am proud of my viewers if I read your story! Thank you for writing it down!
Wow! That's very cool. I started by programming games too. That's an excellent path. The tools these days are so amazing, they allow you to really set your creativity free. My first home computer was an Apple ][ back in 1978 with 16K of RAM and a 1MHz CPU that was over $2000 in 1978 dollars. Now a $10 ESP32 can do so much more that it's almost silly. I am envious of your generation in many ways but I'm also grateful I got to listen to 1980s music as it was being made. Anybody who can design an RF communications system is very impressive to me, as are people who can speak more than one language, so you are doubly impressive. Americans are probably the least linguistically knowledgeable people on Earth so being bilingual is an excellent and valuable skill to many development companies. Developing an operating system is also impressive so make that you are triply impressive. I appreciate your offer of an explanation video however at the moment I am in the middle of designing a system for a client based on 12 different ARM Cortex M4 nodes on CAN-bus and my head is so full that it's leaking so I must decline your offer, but I encourage you to make such videos and place them on TH-cam because they can be a very powerful tool for getting a job. I also encourage you to make them several times over a few months like each is practice for the making the next and get feedback from your peers to help with refinement. Most of the time people make documentation only once and it's like the 1st time a musician plays a song, no matter how good it sounds, you know that the 100th time will sound better because of practice. Your 4th video about a subject will typically be far better than the 1st. I pay attention to how creative people are when I hire and my last hire got their job by showing examples of building guitar sound processing circuits she had developed and others she built from designs on the net. Showing examples of what you can build is more powerful than most things you can see written in ink. For most positions I deal with, to me a physical example of something you designed and built is far more powerful than a degree from anywhere. Einstein did not possess a degree in Relativity Theory and he was reportedly a very poor student. There are some positions where a deep education is necessary but most positions from my experience require somebody who is capable and enthusiastic and able to adapt to the needs of the moment rather than somebody with a piece of paper. Once you make it into a development lab, somebody like you will naturally advance so don't worry about entering as a technician as long as the pay is acceptable. I wish you the best and perhaps the best advice I could give you is to be very persistent and get your resume out to lots of potential places because it's a numbers game, but above all make sure you're happy where you work because you cannot buy happiness, you can only generate it.
Amazing video, as always :)
Thanks!
Semaphores and MUTEX 101 primer in a few minutes... Another great video !
:-)
What an amazing video.! Thank you so much sir!
You are welcome!
Subscribed, your channel is awesome!
Welcome aboard the channel!
This is my favourite of your videos
Glad you like it!
So far a really helpfull video, thanks andreas.
You are welcome!
Great clip, love your work!
Thank you!
Excellent presentation!
Thank you!
Great video. Thanks. Will be very useful.
Glad you think so!
Great video. Please continue with the good work. :)
Thank you!
Awesome video. Now I going to have to change my plans and play with this. 😁
The same happened to me when I discovered that it is possible ;-)
Excellent and well presented video. Very interesting content - thanks Andreas
You are welcome!
great information as usual !
Glad you think so!
that is a simple and yet a great video
thank you
You are welcome!
Thanks for the video. It is very structured and clear. RTOS is about being "real time". The RTOS guarantees execution of the command at that specific time. This is essential for real time control. Conversely non real time OS such as Windows, does not guarantee that an instruction will be executed exactly at the programmed time. For example,
In Sleep(1); Print("now");
Print statement may not be executed exactly after a sleep of 1 msec in non RTOS. This is because non RTOS drivers for example filesystem and network drivers may take longer than 1 msec before returning control back to the OS. In real time control systems, this unpredictability is disastrous.
Hence RTOS is about "real time" and it is a big deal, very big deal.
RTOS are expensive.
Hope this is useful. I am sure you can explain it much better than I can, thanks.
Thanks for your clarification.
Great job! Loved the video. Thanks Andreas. :)
you are welcome!