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- čas přidán 3. 11. 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 - Věda a technologie
RIP arduino. We had a good run
Maestro, the quality of this video exceeds even your usual high standard. Superb job sir!
Thank you for your nice words!
HOLY CRAP!!!! Brilliant! This is going to to be one of your most classic videos Andreas!
I hope so ;-) Thanks for your compliment!
As always.. to the point and amazing... Always learning new thing with your videos... You are a blessing Andreas.. 😀
Thank you!
I agree
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 CZcams and expected only a few viewers...
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 ;-)
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.
The guy with the Swiss accent is kicking some serious ass -- great job!
:-)
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...
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 CZcamsrs) 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.)
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...
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.
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...
Thanks a lot Andreas for this amazing introduction. Great tutorial, as usual.
You are welcome!
Hi Andreas, what amazing explanations and examples you did!
Congratulations from Brazil!
Thank you!
Another great video Mr. Spiess. I'll be rewatching and following along with my esp32 😊
Thank you!
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!
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!
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!
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.
I'm stunned by the perfection of this content
Thank you!
Awesome episode on a very interesting and powerfull topic! Thank you very much, Andreas!
You are welcome!
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.
Well what can I say, great as always. Looking forward to some Christmas themed videos.
We will see if I find the time...
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...
This video is great!! and quite useful to get the most from the ESP32!
Thank you!
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...
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.
This is probably most useful and important video about programming ESP32 I've seen.
I also like this concept of tasks.
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 :)
Awesome! Thank you for you very systematic videos. Much appreciated. Long time fan :)
Thank you for your feedback!
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
You make the best and most informative content on CZcams. A good diversion from all the cat videos... :)
Even if on some of my videos our cat appears ;-) Thank you!
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....
SO much great info in this video! Thanks, as always, for sharing with us!
You are welcome!
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!)
Outstanding!! Such a helpful illustration. Thank you.
You are welcome!
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!
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...
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🤗
:-)
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 CZcams and people like you!
Glad to be of help. I also learn a lot through CZcams!
I was thinking the same thing. I just got the itch to explore ESP32 bluetooth again and Andreas posted a video the day before!
Great break down of how the ESP32 Dual Cores actually work. Thanks for making me smarter quicker!
Glad to help!
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!
Dear Maestro, thanks for this great, great video! It is fantastic! Saludos from the south of the world! ;-)
You are welcome!
Thank's for your videos Andreas! Really enjoy them, very good info.
Now i really must buy an ESP32 board.
You are welcome!
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...
Amazing video, as always :)
Thanks!
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...
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...
Fantastic video! Extremely clear examples.
Glad you think so!
Excellent video! Really good stuff here!
Thank you!
Incredibly interesting video!
Thanks again Andreas
You are welcome!
No way I will digg Up My old Uno now. Love the videos
Thank you!
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 ;-)
Hi Andreas, Great video as always. You are the master!
Thank you!
Tight video, clear and to the point. I like that you don't confuse us with race condition.
Thanks!
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.
Andreas this is amazing! Keep it up!! :D
Thank you!
Great clip, love your work!
Thank you!
Super useful info again, thanks Andreas!
You are welcome!
Dude, your content is priceless!! Thank you
You are welcome!
this is sooo exciting... i just got an esp32 now it is time for my little r&d hobby stuff...:/ thanks loads...:)
Have fun!
Great job. Now I more interested to buy an ESP32 board. Thank you for all good videos you making.
You are welcome!
Absolutely excellent Content presented at a comfortable rate. Thank you very very much.
Thank you for your feedback!
Well, this solves a problem of mine. Excellent Andreas.
:-)
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.
@Andreas Spiess... : You are Rocking man... This is Super Practical Video...
Thank you!
Great video. Please continue with the good work. :)
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!
Excellent presentation!
Thank you!
This is really very useful .
Thanks for sharing knowledge .
You are welcome!
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! 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.....
Great Andreas, as usual.
Thanks
You are welcome!
This is my favourite of your videos
Glad you like it!
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!
great information as usual !
Glad you think so!
What an amazing video.! Thank you so much sir!
You are welcome!
Really amazing sir, I hope more informative videos like that.
Thanks!
Great job! Loved the video. Thanks Andreas. :)
you are welcome!
Master!!! Master!!! I learn a lot with your videos Andreas! Dankeschön!
Bitteschön!
Subscribed, your channel is awesome!
Welcome aboard the channel!
Awesome, thanks Andreas!
You are welcome!
So far a really helpfull video, thanks andreas.
You are welcome!
Great video, Very interesting thanks for your effeorts. It is very useful.
Glad you like it!
Very good job as always. Thanks.
You are welcome!
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 ;-)
that is a simple and yet a great video
thank you
You are welcome!
Semaphores and MUTEX 101 primer in a few minutes... Another great video !
:-)
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?
you are a genius, sir. Respect
:-)
Andreas, great Video again!!
Thanks!
hi Andreas! thank you for another great video! very good!
You are welcome! I am surprised by the number of views. Thought, this is only interesting to a few...
Thanks this video is very useful, appreciates your work
You are welcome!
Great video. Thanks. Will be very useful.
Glad you think so!
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.
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"...
nice video! have two of those puppies waiting for their first mission
So enjoy!
Great video as always :)
Thanks!