the write function is as mentioned below: int _write(int file, char *ptr, int len) { /* Implement your write code here, this is used by puts and printf for example */ int i=0; for(i=0 ; i

Thanks, very helpful! Small addition: if you don't have a newline at the end of what you're printf-ing, nothing will show up until a very large buffer has been filled, then you get it all at once, on a single line. At least that's my experience.

I have been binge watching your STM32 videos. They are well thought through and thorough. Thank you, Arun.

Brilliant! Slow and careful explanation - unlike 99% of other tech channels!

I've been helped. This is a great tutorial! Keep up the good work.

Hey! Thanks for your support! It help me a lot!

Works like a charm! Thanks!

I didnt see your video and im already loving you

hi, thank you so much, Now I am new to this cubeide

Thanku for this video may god bless you

so helpful, thank you bro.

sooo helpful, thank you!!!

Simply perfect !!

thanks for the extremely good content quality ! What's your OS desktop environment ? it's smooth

IT WORKS! THANK YOU!

Your videos are fabulous and quite empowering! I have two questions: How can I contribute some money to help fund more of the same? And if that is a computer voice on the video, can you share what technology is being used? I'd love to know. This virtual world is without borders and everyone benefits from the sharing of knowledge. Thank you SO MUCH, once again!

Thanks! Really helpful :)

I really big thank you to you

Thanks. For the STM32F429i-DISCO, you need to solder SB9 (to connect SWO-PB3 to the ST-LINK) to make it work.

I'm using STM32CubeIDE version 1.2.1 on a Nucleo board (STM32H743 has an stlinkv3 v3.J6.m2), but I can't find where to set HCLK. I've enabled SWV in the debugger config and set the clock there, but not in the project. My HAL_Delay (1000) is *way* longer than a second so the default is probably wrong. Also, I've included stdio.h however, I don't see the "Hello World" in any of the window views (Console, Debugger Console, SWV Data Trace Timeline Graph, SWV ITM Data Console). In the SWV view properties, I've enabled Comparators 0 and *1* (although that don't seem to be necessary), and checked the ITM Stimulus Port bit 0, and the red 'Start Trace' record button is set. Could the HCLK setting also be causing the ITM_SendChar to fail? I assume the ST-Link's usb connector, when not programming, just passes the SWV data to/from the cpu? UPDATE: Pressing the Blue MX button on the right doesn't seem to do anything, but double clicking the .ioc file did! After checking the clock speed shown in the Clock Configuration (64Mhz) and applying it to the SWV Debugger Clock speed it worked! Would be nice for ITM record to start automatically, but what exactly does enabling the stimulus bit 0 do?

Your intro destroyed my apartment!

why STM do not support printf() in STM32CubeIDE ? Seems me, this function is very useful and commonly provided almost IDE's. Is there any reason avoiding implement ?

Hi, thank you for the video. Works great, however, only in .c files. Is there a way to work in cpp files?

Hello , Guys.. This person has shown a true configuration for using printf() function. If you facing issue in printing context using printf() , then please try to use "/n" after the writing the context in printf() function. printf("hello world") -> Nothing will print on SWV ITM Data Console printf("hello world/n") -> Proper Output on serial console...

Good jop! Thank you.

Hello, Thank you for this tutorial! Really usfull. Two questions - The printf are working even when I do not activate any comparator. Is it normal? - When activating the comparator 1 (with address 0x0), it display a "data" 0x0 in the SWV Data trace Timeline Graph. Is it still the comparator 1 that should activate printf?

Thank you for this. What is the serial comm program are you using it looks like it is integrated with eclipse.

it works thanks

Great video! What IDE theme are you using?

why my nucleo f302r8 is not working, it does not showing any printf output

Thank you very much. The live expression works but the graph and the console doesn’t work with an official nucleo stm32L432kc. Do you have an idea where this problem comes from ? :)

Does anyone know where we can find ST Micro tutorials on how to use these various features?

Very helpful.

i have done the same procedure but neither the itm data trace nor the time line graph showed any thing

based thanks

Hi Controllers Tech, thanks for the clear explanation. I could made a debug session but only show debug data in step by step execution. Any idea? Thanks again.

Hi. Is it possible to save the port values to a text file?

I TRIED THE SAME WRITE FUNCTION, BUT IT'S SHOWING UNDEFINED REFERENCE TO ITM_SendChar,,,,,,how to solve that? 😞

Hello, I tried to set up the printf debuging with the bluepill board and the st_link v2 chinese dongle but can't make it work. The variable "count" in the live expression and the led toggle work but I got nothing on the console editor...Any idea? Thanks

Hi AD, let make a video about stm32 vs AS608 fingerprint sensor. I see everyone use it throw arduino but i don't know how to use it with stm32. Thanks a lot!!!

Alternatively, you could overwrite __io_putchar(). _write() calls __io_putchar.

Is it possible to have the swv console always active? I hate clicking the record button every time.

I just want to mention that after 4 hours searching for the error, re-wiring my hardware twice, changing cables, rewriting projects... printf("...") was not printing anything in the DATA CONSOLE because I FORGOT the LINEBREAK (" ")!!! So printf("Hello stupid") prints nothing, printf("Hello stupid ") prints it correctly...

Dear sir, pls share any example code regarding gsm communication with stm 32 microcontroller..

WOW dark theme!

worked more or less with stm32f3discovery. one small problem though, in live expression "Target not available" was displayed in place of value for count variable.

It works even if you don't enable SWD in CubeMX ? How would it know what debug protocol you are using?

but when i use any Hal_delay function in my int main while loop along with printf it doesnt print ot any thing on the console

It doesn't show anything for me either (stm32f429I-DISC1). I connected the PB3 pin of the microcontroller to the SWO pin of the debugger with a wire. It started displaying characters, but not the string "Hello world". I changed in Serial Wire Viewer, Core Clock (MHz) to 16.0, and it displayed the string "Hello world" 😃.

I'm using a STM32L151CB and a legit ST-Link/V2 Isol. (Own custom PCB) Strangely, when i click "start trace", the square around the circle lights up, then, when i press resume, the circle is greyed and unselected. No data shows up in either of the SWV tabs, but i have the live expressions working fine.

I have try this but not give ouput in swt port.

I am using STM32F407VG board, shows error while debugging i.e. " Error in final launch sequence: Failed to execute MI command: load "G:\\udemy\\embedded c\\my_workspace\\target\\001HelloWorld\\Debug\\001HelloWorld.elf" Error message from debugger back end: Error finishing flash operation "

Hello, it's a great series with many information. One question: does it work with tasks? Meaning some printf in tasks don't show at my board. Does anyone have a solution?

Not working on Nucleo F303RE before setting Debug Mode to Trace Asynchronous Sw. After that it just works fine!

how can I get assisted while I'm writing the instructions ( I have to write the full instruction..) :/

Nice video. Although it doesn't work for me. Nothing is printed. I use an ST board as a debuguer for another board.

Exists one way to save the data log from SWV trace into a txt file?

Hello. What if ITM is not available? I am programming stm32wb55 Nucleo board and I am trying to setup printf for debugging. This method does not seem to work due to the microcontroller not supporting ITM

SWV is working with the frequency of 16 MHZ but it didnt work with 168 MH.. Why ? my board ( stm32f407g)

I think God punishes me because I made exactly the same thing as you and nothing happens. I use the original ST-Link V2 debugger and STM32F446RET MCU. Edit: After 7 month of trying this again on my Nucleo, now it works!

I am using STM32L475 ..will it work ? I am using micro usb only.

Hi. Thank you for this video! But I've got a problem: SWW trace and SWV ITM console do not shows any data. Live expressions works fine. Any advice? Thank you

In STM32 HAL and LL , which one is best for creating big and complex projects ??

it looks like you got a reset button for the debugger. if so, how do i get the button ?

Thanks! Now, I'm trying to make scanf input, but no results..

ITM debugging is only for Cortex-M3 / Cortex-M4 / Cortex-M7 chips. Make sure your stm32 has one of the aforementioned controller.

can it work with stm32f303 ?

STM32 F0 doesn't support the SWV (viewer) , too bad

How can I use this mmethod for STM32F103? Can you tell me the way?

Discovery board as st-link, own board with stm32f103. It doesn't work. ((

how can i change/modify variable's values while code runinng ?

i love you

how do i do the same in putty

how abou iar ?

Thanks so much 💞

Can I do it with my board STM32F4 Discovery?

where is the ITM sendchar

Wtf... why does a printf command has to be so needlessly complicated? In arduino or mbed you just write printf(...) and done. With stupid CubeIDE Shit you need a doctors degree to get a simple output... just ridiculous. Who can use that or create anything more complicated than a blink sketch? Speaking of which: A fucking blink sketch generated in cubeF(uck)X for my discovery board gives me a 700!!!! lines main.c file. WTF?!? 700 lines to to toggle an LED on and off???