hello every oneI'm using stm32f101vbt6 by st-linkv2 programmer.after few times programming my micro i get this message : no target connected. so my debugger can't recognize microcontroller.
i checked every connection and it was ok I tried j-link programmer but j-link couldn't recognize micro too. so i changed micro and programmed micro few times and this problem happend again for three times.in my pcb design i connect SWDIO from programmer to micro and between them i put 330 ohm resistor.same thing for SWCLK as the picture uploaded.
in my board when programming i'm connect my power plug on from adapteri don't know why this happening.is it because of ESD(Electrostatic Discharge)?Is my design has any problems?i didn't have this problem for stm32f103.appreciate your help.
There would be a possibility that Option bytes are programmed accidently to protection level NO Debug.
i got my answer here
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