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Can't Reset The Core ST-Link Error

Question asked by clark.david.001 on May 23, 2012
Latest reply on Apr 30, 2013 by ostap.oleg
I am using an ST-LINK JTAG to communicate with an STM32F103RGT6.

We are able to communicate with it using SWD and Connect Under Reset option, but if we uncheck this box we are unable to communicate with it and get an error dialog displaying "Can't Reset The Core".

We have no idea why this is happenning as the nRST line is connected and is pulsed low by the ST-LINK - which has been checked on an oscilloscope.

The only other thing that could be a possibility is that in the design the nTRST line is disconnected, but from various documentation sources it looks as though we don't need that.

Very grateful for any help on this.