No ST-LINK detected! Please connect ST-LINK and restart the debug session. Please help me. I am user.

[NKann.1]

I am using STM32CubeIDE for my project . when i want to run the code i am getting this pop up.i am not able to solve this issue.

[mattias norlander]

Which MCU?

Is it possible that the PWR regulator has been configured incorrectly so that the MCU is not powered. That would lead to "Target unknown MCU target"

Try to measure some GPIO output pin that you now should produce a signal when your app is running without debugger. Does it produce the expected signal or is the MCU not powered at all?

[NKann.1]

Q) Why can't you try in SWD mode ?

ans- yes ,its working, but after running it showing connection lost

Q) Did you connect the STLink reset pin to NRST pin of device ?

ans- i think no, i have attached schematic(screenshot as well as pdf)

Q)What is your mcu device VDD value ?

ans- 3.3 V

Q) Do you power the appli board with an external supply ?

ans- yes

Q) Can you share the stlink connections ?

ans -yes

 

[LaurentL]

OK, you didn't connect the Reset pin.

If you can add the connection, it's better.

Then, without reset coming from STLink, you should avoid "Connect under reset" mode in debugger tab in debug config.

Like you did on STM32CubeProgrammer, use "Software Reset system".

Try to mass erase the device with STM32CubeProgrammer before debug.

[NKann.1]

I selected "Software Reset system"and run with JTAG

it showing "connection lost" before running.

[NKann.1]

using JTAG i am getting this

[NKann.1]

is 22 ohm resistor(in JTAG connector in schematic) causing any problem?

[NKann.1]

Q) Try to mass erase the device with STM32CubeProgrammer before debug.

ans- i did it succesfully.

[LaurentL]

I don't think the 22 ohm is a problem.

But you can lower the STLink freq (instead of "auto", choose 8 MHz or lower).

Can you try with Openocd.

In the debugger tab, choose Openocd debug server.

Then, click on "show generator options" to select the "Software system reset".

Maybe try also an empty project. Not a Cube project.

[NKann.1]

i tried with open ocd and  click on "show generator options" to select the "Software system reset".

now i am getting this error bellow

[LaurentL]

Can you try on an empty project to be sure that the code is ok.

Mass erase the device before debug.

Can you add "-d" in Openocd Options and attach the console log text to see why you have the "auto_probe failed".

Which device did you select in the project ?

And which device you have exactly ?

STM32H7B0VBT6 with a Q letter at the end ? or no letter ?

If you have the Q letter, it is a SMPS device and power supply is different from a normal device.

So the application schematic must reflect the part number on supplies.

Also on Cube project, select the right device.

[NKann.1]

with SWD and internal clock even after the message "Debugger connection lost....shutting down " i am able to get some signal on my oscilloscope.

this code is for toggling LED.

but i am not able to operate it with JTAG.