AnsweredAssumed Answered

'core held in reset' issue

Question asked by Bruce Brealey on Jan 24, 2018
Latest reply on Jan 24, 2018 by Clive One

Hi I'm using the STM32F745VE on a Product.


I have been using a nucleo board (with ST link utility) to program the product via SWD connector (3V3 provided separately) which has been fine so far.

I am now at our suppliers site with the same lap-top, cables and nucleo PCB but when I try to 'connect to target' on their PCBs its takes a long time then gives 'Cannot connect to target'. Once OK is pressed the message in the bottom pane of ST-Link says 'core held in reset'

When I probe the reset pin on the target PCB it is 0.8V. This is the same whether the Nucleo is connected to the Lap-top or not. If I disconnect the Nucleo from the target PCB its reset pin returns to 3v3.


What I would like to know is if the nucleo should pull the reset down like this or is it broken? it was in an aircraft hold for 10+ hours. I don't think its the target PCB but this is the only thing that is different.


Many thanks