In case anyone else has this problem: if for some reason your code doesn't run, (i.e. you get a hardfault, or debug terminates immediately), please make sure the NVIC priority Group is set to "4 bits for preemption". You can do this by going to the System Core menu and selecting NVIC. On the top left you have a drop-down menu called Priority Group. Here, select "4 bits for pre-emption priority 0 bits for subpriority" As a beginner, this was pretty frustrating to figure out, and I wasted a good 3 hours before I finally found the solution
After reading many theories about RTOS that I was unable to figure out how it works on the MCU. But just a Basic video clip of RTOS, I understand how it works and will confidently know how to apply when learning through your video clip ! Thanks so much!
Wow very nice, this really ilustrates how one wuold intuitively want to develop an operating system, simply an easier way to manage many processes after starting with one, which is how most of start with when programming MCU's. An even handler is another way I was just reading about, which i guess an Operating system is just a big fancey event handler. There was someone who made an event handler librarby for MCU's to get around main loop issue which solves the same problem it looks like albiet an even more stripped down solution with less overhaed then an OS, but some would even complain that the overhead of an event handler is too much. I was just watching Mitch Davis's bare metal programming series with MCU's and he showed the LED blink sketch blink almost 20x faster by accessing the register directly as opposed to calling DigitalWrite(), almost 20x!! thats huge, so theres something to be said about the bare metal approach if you really need it, and
Hi there is a big question in me about Freertos! Imaging if we have 3 functions and compiler needs to run every function in 1us so all functions needs 3us to run Can Freertos do all of these 3 functions just in 1us and same time?
I am using the stm32f103c8 and I am facing a problem in debugging in both open OCD and GDB server connecting (problem- Please that latest version of GDB-server is used for connection.). Please help me.
Sir, at 3:26 TIM1 has been selected instead of SysTick. Is TIM1 configuration not required? Code generator handles that and configures it to get 1ms system tick?
Whilst i understand about the priority system, i dont understand that when the tasks were the same priority it didnt function as intended? What happens if i want the two tasks to have the same priority? Secondly, could this problem have been solved with MUTEX's?
In case of same priority tasks, the preemption will not take place. So one task have to wait for other to finish. What problem exactly? Plz watch the mutex video to understand what it is and where should we use it
I'm Newbie about FreeRTOS, In example at 12:25 and 13:30 , you explained that "delay is large" so I think this here reason is you were using the same UART ( UART2) and all task's priority are the same ( Normal ). There aren't "delay is large". Please explain to me ?? Please Rep me !
Yeah you are right. I was trying to show the abnormal behaviour of tasks with same priorities. When the suspension time is large, they get enough time to send the string to the uart.
hello, thank you for your videos , i had this error : "Error: Flash Download failed - Could not load file 'RTOS_1\RTOS_1.axf'" i'm using nucleo-f401re with 512kbytes flash memory. could anyone help me please ?
hello sir! i'm new on this how can i get that 'moserial' if computer port doesn't connect to any STM32 board? i've run the Debug As -> STM23 c/c++ Applications and it popped up 'No ST-LINK detected!' hope u can help!
@@ControllersTechcan we do this on STM32F103C6T6A board (Blue pill), sir? It's connected to ST-LINK V2 but it got errors when Debugging. Hope you can help 🙏
oh right you later got a warning and then you changed it. I commented before watching it completely. Btw, you say use any timer, but I prefer TIM6 and TIM7. I am sure people who read my comment -- most of them know why its better to spare other timers.
Hello, thanks for the video. I have started to learn RTOS recently. I did everything you had done in this video but serial terminal sends fx`ffxfxfx`fx`f message instead of "hello from ..." message via UART constantly. What is the wrong thing I am going?
Could be the baud rate issue. Check if the baud rate is same in the serial terminal also And if you are using uart with RTOS, probably you should learn uart first.. or use LED blinking or increment some variable for simpler process.
@@ControllersTech Baud rate is correct.Yes, my UART knowledge is not good. I am trying to understand my mistake. I can send this array of ascii code and it prints EMRULLAH uint8_t data[9]={69,77,82,85,76,76,65,72,1}; HAL_UART_Transmit(&huart2, data, 9, 1000); But I cant send this string uint8_t data[]= "Hello from DefTask "; HAL_UART_Transmit(&huart2, data, sizeof(data), 500);
Question: Hi, first of all thanks for your teaching videos. I have a question in relation with task and how to call a data from model, I mean, I'm using touchgfxdesigner, there you know that it is used a MVP software architecture, so I'm looking the way to refresh a data in the model using a RTOS task every second (I'm using a date class to store the date, so I want to use the this data date to be used in all of the program), so my problem would be how could I call model inside a task in order to refresh the date every second. Thank you very much.
@@ControllersTech HI, I'm using an external module RTC that offer a high precision and stable clock, this piece of hardware feature an i2c communication protocol, also a battery backup, so I need to ask periodically the date to this module and update it in the rest of the system, I had thought that throughout a task could be a good way, how do you see it? Thanks.
Yeah you can use it. Just call the get time or get date functions from a task. It doesn't matter if u call every 100 ms or 1 sec or 10 sec, the clock will be always correct
Thanks for your sharing. Could you tell me how to open the tool used to watch messages from UART in your video? I have followed your video until I get stuck there. Thanks :)
Thank You for such a great video kindly make a video about max30102 with bluepill using cube ide. Because it does have any proper reference in youtube THANK YOU
Thank you for such good tutorials !!! I have a small problem. Everything works fine when I run the code. But when I try to debug the code line by line in the CubeIDE, after HAL_Init() and SystemClock_Config(), the program always gets stuck in the IRQ handler (stm32fxx_it.c file) of the respective timer that I use. Could you let me know what the issue might be.
yes you are right. I don't know why it was showing 5 ms.. I don't remember but i think the oscilloscope video was pre recorded... Anyway you got the point of that demonstration I hope.
Hello. Million thank for the amazing embedded videos you are making. I would be grateful if you could make one, or at least explain how to use the USB host with freeRTOS. It works perfectly bare-metal, but when I try with freeRTOS, I end up with gState HOST_ABORT_STATE. It is unable to actually connect to the device. In the defaultTask I have the following code: MX_USB_HOST_Init(); vTaskSuspend(Task2); for(;;){ USBH_Process (&hUsbHostHS); if(hUsbHostHS.gState == HOST_CLASS) //device connected and ready for communication vTaskResume(Task2); } osDelay(1); Could you explain to me what I am doing wrong?
Thanks for the effort, great video. I personally find the narration quite annoying, would've preferred a human even with a broken accent, or even just slides. However that maybe just me.
Because if we do that, the systick might be busy with some hal delay and might miss the task delay. If you don't have any other functions that require delays, you can use systick also
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you said "some basics concepts" but was much more than a blinking led. Thanks !!
In case anyone else has this problem: if for some reason your code doesn't run, (i.e. you get a hardfault, or debug terminates immediately), please make sure the NVIC priority Group is set to "4 bits for preemption". You can do this by going to the System Core menu and selecting NVIC. On the top left you have a drop-down menu called Priority Group. Here, select "4 bits for pre-emption priority 0 bits for subpriority"
As a beginner, this was pretty frustrating to figure out, and I wasted a good 3 hours before I finally found the solution
You really help me on this one :D
Thank you for the demo. It ties up many loose ends for someone that understands the theory yet lacks the actual hands-on experience.
After reading many theories about RTOS that I was unable to figure out how it works on the MCU.
But just a Basic video clip of RTOS, I understand how it works and will confidently know how to apply when learning through your video clip !
Thanks so much!
Great video.
The narration is a very welcomed addition to your style of video, imo.
Kudos also for bringing in the new STM32CUBE IDE.
Subscribed.
Great video. This is what I am looking for, clear english and a simple explanation about tasks and scheduler of RTOS. Thanks a lot
Thank you sir for explaining.
Wow very nice, this really ilustrates how one wuold intuitively want to develop an operating system, simply an easier way to manage many processes after starting with one, which is how most of start with when programming MCU's. An even handler is another way I was just reading about, which i guess an Operating system is just a big fancey event handler. There was someone who made an event handler librarby for MCU's to get around main loop issue which solves the same problem it looks like albiet an even more stripped down solution with less overhaed then an OS, but some would even complain that the overhead of an event handler is too much. I was just watching Mitch Davis's bare metal programming series with MCU's and he showed the LED blink sketch blink almost 20x faster by accessing the register directly as opposed to calling DigitalWrite(), almost 20x!! thats huge, so theres something to be said about the bare metal approach if you really need it, and
This channel always explain best what i was looking for..thanks ❤❤
Hi there is a big question in me about Freertos!
Imaging if we have 3 functions and compiler needs to run every function in 1us so all functions needs 3us to run
Can Freertos do all of these 3 functions just in 1us and same time?
Teşekkürler.
I am using the stm32f103c8 and I am facing a problem in debugging in both open OCD and GDB server connecting (problem- Please that latest version of GDB-server is used for connection.). Please help me.
Thank you for another great, very useful video.
Thank you! I've learned a lot from you. You explain things very clearly and thorougly.
Hi..how to find context switching and jitter in case of dual core stm for two or more tasks??..please jelp me for my project
Thank you. Please continue on such valuable tutorials.
Sir, at 3:26 TIM1 has been selected instead of SysTick. Is TIM1 configuration not required? Code generator handles that and configures it to get 1ms system tick?
Yeah it can handle it. But its advised to use the timer instead of systick.
@@ControllersTech i know that it is advised. The question was if there are any other steps required when TIM1 is selected.
No there is no such thing as steps requiring the timer. When you generate the code, it will automatically point the timer functions to systick
@@ControllersTech ok. Thanks. I thought that I have to configure TIM1 to overflow every 1ms or something like that. Thanks.
Whilst i understand about the priority system, i dont understand that when the tasks were the same priority it didnt function as intended? What happens if i want the two tasks to have the same priority? Secondly, could this problem have been solved with MUTEX's?
In case of same priority tasks, the preemption will not take place. So one task have to wait for other to finish.
What problem exactly?
Plz watch the mutex video to understand what it is and where should we use it
I'm Newbie about FreeRTOS, In example at 12:25 and 13:30 , you explained that "delay is large" so I think this here reason is you were using the same UART ( UART2) and all task's priority are the same ( Normal ). There aren't "delay is large". Please explain to me ?? Please Rep me !
Yeah you are right. I was trying to show the abnormal behaviour of tasks with same priorities. When the suspension time is large, they get enough time to send the string to the uart.
hello, thank you for your videos ,
i had this error : "Error: Flash Download failed - Could not load file 'RTOS_1\RTOS_1.axf'"
i'm using nucleo-f401re with 512kbytes flash memory.
could anyone help me please ?
hello sir! i'm new on this
how can i get that 'moserial' if computer port doesn't connect to any STM32 board?
i've run the Debug As -> STM23 c/c++ Applications and it popped up 'No ST-LINK detected!'
hope u can help!
Which stm32 board are you using ?
@@ControllersTech i didn't connect any board so i can't get that moserial window right?
I'm using window, can you recommend any serial terminal?
Project can't run without board.
@@ControllersTechcan we do this on STM32F103C6T6A board (Blue pill), sir? It's connected to ST-LINK V2 but it got errors when Debugging.
Hope you can help 🙏
7:48
Obviously, that is not going to happen..
why? WHy didnt it work?? could anyone explain please?
I learned things from your video. Thank you ❤️
After execution of a task, are they being blocked ? Wont the high priority task always run ?
Yes they will run. Watch the second video on freeRTOS
in SYS config you let it be SYSTick, you are supposed to select another timer because FreeRTOS uses SysTick so you should avoid conflicts right
oh right you later got a warning and then you changed it.
I commented before watching it completely.
Btw, you say use any timer, but I prefer TIM6 and TIM7. I am sure people who read my comment -- most of them know why its better to spare other timers.
HI, During task creation how to calculate stack size of the task? How this works?
I love this tutorial! thank you so much... is it possible to make tutorial about how to connect FreeRTOS to the things network(without AWS) please?
What you mean by things network ?
@@ControllersTech I mean the website www.thethingsnetwork.org/
Hello, thanks for the video. I have started to learn RTOS recently. I did everything you had done in this video but serial terminal sends fx`ffxfxfx`fx`f message instead of "hello from ..." message via UART constantly. What is the wrong thing I am going?
Could be the baud rate issue.
Check if the baud rate is same in the serial terminal also
And if you are using uart with RTOS, probably you should learn uart first.. or use LED blinking or increment some variable for simpler process.
@@ControllersTech Baud rate is correct.Yes, my UART knowledge is not good. I am trying to understand my mistake. I can send this array of ascii code and it prints EMRULLAH
uint8_t data[9]={69,77,82,85,76,76,65,72,1}; HAL_UART_Transmit(&huart2, data, 9, 1000);
But I cant send this string
uint8_t data[]= "Hello from DefTask
"; HAL_UART_Transmit(&huart2, data, sizeof(data), 500);
Not sizeof(data), use strlen(data) or use the actual length of that string
I am encountering issues with debugging it request I declare my GPIO pin
Question: Hi, first of all thanks for your teaching videos. I have a question in relation with task and how to call a data from model, I mean, I'm using touchgfxdesigner, there you know that it is used a MVP software architecture, so I'm looking the way to refresh a data in the model using a RTOS task every second (I'm using a date class to store the date, so I want to use the this data date to be used in all of the program), so my problem would be how could I call model inside a task in order to refresh the date every second. Thank you very much.
Aren't u using RTC for the date and time ?
@@ControllersTech HI, I'm using an external module RTC that offer a high precision and stable clock, this piece of hardware feature an i2c communication protocol, also a battery backup, so I need to ask periodically the date to this module and update it in the rest of the system, I had thought that throughout a task could be a good way, how do you see it? Thanks.
Yeah you can use it. Just call the get time or get date functions from a task. It doesn't matter if u call every 100 ms or 1 sec or 10 sec, the clock will be always correct
what is this watch window, moserial?
how can i install that?
You can use any other serial terminal also. Like realterm, hercules etc.
Thanks for your sharing.
Could you tell me how to open the tool used to watch messages from UART in your video? I have followed your video until I get stuck there. Thanks :)
I generally use either realterm or hercules for that purpose
Thank You for such a great video kindly make a video about max30102 with bluepill using cube ide. Because it does have any proper reference in youtube
THANK YOU
Thank you for such good tutorials !!! I have a small problem. Everything works fine when I run the code. But when I try to debug the code line by line in the CubeIDE, after HAL_Init() and SystemClock_Config(), the program always gets stuck in the IRQ handler (stm32fxx_it.c file) of the respective timer that I use. Could you let me know what the issue might be.
Yes you can't debug like that. Use breakpoint in the next line and then run the code.
@@ControllersTech Oh Alright. Thanks !!
What serial terminal are you using? Moserial? Where can I find?
It's for linux..
In 7th minute, you said that time period is 5 ms. Shoudnt it be 6 ms?
ps: 3 ms for ON and 3 ms for OFF
yes you are right. I don't know why it was showing 5 ms.. I don't remember but i think the oscilloscope video was pre recorded...
Anyway you got the point of that demonstration I hope.
@@ControllersTech Thankyou for the quick reply. Yes, I got the the point and I appreciate your wonderful effort. Keep up the good work :)
what is your stm32 cube ide dark theme? it seems magnificient. Can you share to us?
It's darkest dark theme, you can download from eclipse marketplace
@@ControllersTech i did what you said. It is darkest dark now, but what is your editor font type? i want eveything about it to be same
my workbench theme is dark gray, and editor theme is darkest dark..
fonts were default
Can i programme in cudeIde with FreeRTOS and no CMSIS-RTOS
Check other videos... They are based on non cmsis version
@@ControllersTech ok thank youuuu i just add your Playlist rtos i will watch all the video in the night
Hi, How to use freeRTOS STM32 with register ?
Sir, I don't know the clock configuration. Please give the details. Thank you.
It's shows in the video. And if you don't know how to configure clock, probably you should first do that first instead of directly using rtos.
@@ControllersTech Thank you.
@Ahamed Fayaz Learn the basic MCU concepts before jumping into RTOS
You can help me how to use interface stm32f4 spi vs st7735 lcd tft...thank you
Yeah it's in my to-do list. I. Not getting enough time now a days. Though you can try to port mcufriend. That will work perfectly
@@ControllersTech thanks you...i hope you can help me as soon as possible
how do you set dark theme in stm IDE
darkest dark theme in the eclipse marketplace
Hello. Million thank for the amazing embedded videos you are making.
I would be grateful if you could make one, or at least explain how to use the USB host with freeRTOS.
It works perfectly bare-metal, but when I try with freeRTOS, I end up with gState HOST_ABORT_STATE. It is unable to actually connect to the device.
In the defaultTask I have the following code:
MX_USB_HOST_Init();
vTaskSuspend(Task2);
for(;;){
USBH_Process (&hUsbHostHS);
if(hUsbHostHS.gState == HOST_CLASS) //device connected and ready for communication
vTaskResume(Task2);
}
osDelay(1);
Could you explain to me what I am doing wrong?
Hi
can multiple functions run just in one task?
Yeah why not. Think of the task just like the while loop, but with a little more control over it.
@@ControllersTech so what is a different between normal while loop and a freertos task?
You can suspend and resume tasks, pass information to them, etc..
@@ControllersTech thanks👍
Thanks for the effort, great video. I personally find the narration quite annoying, would've preferred a human even with a broken accent, or even just slides. However that maybe just me.
It's not THAN it's THEN ! How hard can it be to know the difference ?!!
Why shouldn't we use systick in freeRTOS?
Because if we do that, the systick might be busy with some hal delay and might miss the task delay.
If you don't have any other functions that require delays, you can use systick also
Great video
i can't donwlad a moserial
Super! 👍👍
you want to create two signals with a while loop , and monitor them with single probe , ur demo sucks at showing the benefits of the RTOS .
Great !!!
Perfect 👍🏻
super video sir
thank youuuuuu
Thank you