Got error like ST-LINK error (DEV_TARGET_NOT_HALTED) when to flash the program.

[Tsh.1]

Hi,

I was trying to disable Tzen in my nucleo-l55ze-q (stm32l55), but before disabling i forgot to flash toggle gpio programmer into board, and tried to set RDP to 55 and i clicked apply,

From that moment it is not able to detect the STlink!..

please give me any suggestions .

Thanks and regards

Teju S H

[Uwe Bonnes]

Try to connect under reset or get the device into bootloader mode and then connect the debugger.

[Tsh.1]

Hi @Uwe Bonnes​ 

i have tried connecting under reset it doesnt worked .....

and now i have connected boot0 pin to vdd and now i am able to flash the bin files as connected to hotplug......

but i am not getting any data in serial port....

can erasing chip will slove this..??

Please suggest me regarding this..

Thanks and Regards

Teju S H

[Houda GHABRI · Accepted solution]

Hi @Tsh.1​ 

This is an expected situation in this case.

The tool explicitly give a recommendation to flash a valid secure code jumping to non secure code =)

The only way to recover the board is to boot on RSS : BOOT0 pin PH3 to VDD (hope you are using boot selection through Boot 0).

Try this please and tell me if it solves your issue.

Houda-

[MSher.1]

I am facing the same situation. Can you give some more detail about this boot process? I ensured the boot option was checked prior to making the change to RDP.

Edit: I found the relevant section in the manual for the kit, section 6.4.2 Boot from RSS

[Hueli.1]

I had the same issue after flashing a corrupted build.

The solution is to select Hardware reset under Reset mode in STM32Cube Programmer

[MichaelR]

I have similar issue, using STM32F412G-DISCO board. It worked OK, but while trying to learn how to use the flash memory, suddenly it stopped work.

how cam I boot it?