No STM32 target found

SDu T · ‎2025-12-10

Good day

I have a Custom PCB with a STM32F217ZG populated.

When trying to program with the STM32CubeIDE I get a No STM32 target found error.

Then I tried with the STM32CubeProgrammer and get the following:

20:27:26 : UR connection mode is defined with the HWrst reset mode
20:27:26 : ST-LINK SN : 0670FF363445503043034042
20:27:26 : ST-LINK FW : V2J46M32
20:27:26 : Board : NUCLEO-F207ZG
20:27:26 : Voltage : 3.26V
20:27:26 : Error: Unable to get core ID
20:27:26 : Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication

In STM32CubeProgrammer I have tried the Modes in Normal, PowerDown and Under Reset. In Reset Mode i have tried Hardware Reset and Software Reset.

When measuring with an scope on Pins 105, 109 and 25(NRST) I do see the Reset, Clock Pulses and something like Data Pulses but still get the error.

Can someone Please help me with this error.

Andrew Neil · ‎2025-12-10

@SDu T wrote:
I have a Custom PCB with a STM32F217ZG populated.

As it's a custom board, you'll need to post the schematic

How to write your question to maximize your chances to find a solution

Is it a new design? Has it ever connected before?

@SDu T wrote:
20:27:26 : ST-LINK SN : 0670FF363445503043034042
20:27:26 : ST-LINK FW : V2J46M32
20:27:26 : Board : NUCLEO-F207ZG

So you're using the ST-Link from a Nucleo board?

Are you sure you've disconnected everything from the MCU on the Nucleo board?

Have you tried using a standalone ST-Link?

https://community.st.com/t5/stm32-mcus-products/help-troubleshooting-stm32g431-board/m-p/853655/highlight/true#M288336

https://community.st.com/t5/stm32-mcus-products/help-troubleshooting-stm32g431-board/m-p/849990/highlight/true#M287696

How to solve connection errors when connecting and programming the STM32 target board.

How to solve debugger connection issues

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Karl Yamashita · ‎2025-12-10

Try another USB cable. I've had a situation where I could not program an STM32 and got the same error that you've shown. I was able to communicate with the ST-Link with STM32CubeProgrammer so I thought the cable was good and i never second guessed the cable.

The next day, when I change the cable, I was able to program the STM32 easily. YMMV.

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