Nucleo-H7A3 Error: No STM32 target found!

[Evan .1]

I'm trying to get a nucleo-H7A4 getting to run my code.

Only I got this message now:

     -------------------------------------------------------------------

                      STM32CubeProgrammer v2.4.0                 

     -------------------------------------------------------------------

ST-LINK SN : 003A001A3038510234333935

ST-LINK FW : V3J6M2

Voltage    : 3.31V

Error: No STM32 target found!

2nd connect tentative with a lower frequency (8MHz)

ST-LINK SN : 003A001A3038510234333935

ST-LINK FW : V3J6M2

Voltage    : 3.30V

Error: No STM32 target found!

Encountered Error when opening C:\ST\STM32CubeIDE_1.0.2\STM32CubeIDE\plugins\com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.win32_1.3.0.202002181050\tools\bin\STM32_Programmer_CLI.exe

Error in STM32CubeProgrammer

Debugger connection lost.

Shutting down...

Is the device now bricked? Any how is this possible with only programming flash?

[Uwe Bonnes]

Try connect under reset.

[Evan .1]

I did, the device doesn't start programming when the reset button is pressed.

When I release the reset button I got the same error message.

[PMath.4]

I've had precisely this problem.

Solution is to connect BOOT0 high. Then power on. Connect a second USB cable to CN13. Run STM32CubeProgrammer and connect over USB - not ST-LINK. You should get a connection. Then erase all memory on the H7A3. Power off. Remove BOOT0 connection. Power-on and you should find ST-LINK works again.

Why? - Who knows - a bug in ST-LINK V3?

[Evan .1]

Thanks!. That solved it.

[Kier]

A possible explanation (and slightly simpler remedy) for this is mentioned in the manual, section 7.4.8:

https://www.st.com/resource/en/user_manual/um2408-stm32h7-nucleo144-boards-mb1363-stmicroelectronics.pdf

The remedy on page 26 can be interpreted as just:

- Connect CN11 pins 5 (BOOT0) and 7 (VDD).

- Start Cube Programmer with USB cable attached to CN1 as you would normally.

- Full Chip Erase

- Power down.

- Disconnect CN11 pins 5 and 7.