STM32 Unable to get Core ID

[Najistics101]

Hi All,

I'm new to using the STM32 and honestly had great grief trying to connect to the chip.

I'm using STlink V3 and designed my own PCB.

Trying to flash a F/W to the PCB. 

I ordered the PCB from JLCPCB.

I keep getting unable to get core ID as a message and I can't figure out why?

I seem to be able to connect for a few seconds but than i get a message, unable to get core ID and it disconnects.

When I compile a code and try to flash it, it also tells me flash successful but I don't think the code got flashed successfully as the chip doesn't work as expected and also I am still unable to connect to it and i get messages unable to get Core ID.

Any help or suggestions? I have the RST connected to GND with a resistor, schematics attached.

[TDK]

> When I compile a code and try to flash it, it also tells me flash successful but I don't think the code got flashed successfully as the chip doesn't work as expected

If it says successful, it was probably successful. "doesn't work as expected" is probably a code bug. What does your code do? Keep it simple, blink an LED as a first test.

Run it in debug mode, step through, etc.

Schematic seems okay.

> I have the RST connected to GND with a resistor

Guessing this is a typo. A 1 nF cap to GND is fine.

[Najistics101]

Thanks for your reply. 
I was under the same impression as you.

But using STM32CubeProgrammer i can never fully connect  to the STM32 in the new PCBs.

It keeps telling me unable to get core ID.

Any idea why?

[TDK]

If you cannot connect, what is telling you the flash was successful?

Could be a board manufacturing issue. Bad solder joint. Wrong orientation. No or insufficient power. Rather than guess, be objective about it.

[Najistics101]

"If you cannot connect, what is telling you the flash was successful?" i'm wondering the same exact thing.

I got the PCB made at JLCPCB, the chip has sufficient power. If it's wrong orientation i would not be able to connect not even for a few seconds and i would not be able to flash any firmware successfully using STM32cubeIDE

[Karl Yamashita]

Try removing R62 and see if it improves

[Najistics101]

would this play any affect? 

The Schematic design is created using STM best guidelines.
Also why am i able to flash a firmware at times and not be able to connect to the chip? 

[Najistics101]

Is there a BOOT0 that i need to connect to ground? 
Do you know which pin this is looking at my schematics?

[TDK]

What is the part number of L6? What happens if you short it? Doesn't seem like you should have an inductor there.

[cpal]

Were you able to figure this out. I am having the same exact problem as you!

 

[TDK]

@cpal You're getting the same error message. The problem could be totally different. Make a thread with the relevant information (board, schematic, screenshots, what you've tried, etc).