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[STM32F051K8] No SWD connection after some time ...

Question asked by Legrand.Thomas.001 on Aug 10, 2012
Latest reply on Oct 1, 2012 by Clive One

I'm working on a custom board around a STM32F051K8.

I was playing with it for 2 or 3 days, everything was fine, then without moving it or something, it stopped responding to SWD interface.

The previous code is still running in the MCU.

The ST Link V2 + ST Link Utilities says not target, JLink manage to stop the core apparently (I have a LED kind of blinking that stops when JLink try to program) but says internal unknown error (the magic one !).

At the time it stopped working, I was coding some DMA stuff for PWM.
I checked connections, everything is ok.

Any hint on what can be wrong ?
I know sometimes on STM32F205 when you cannot access the core via JTAG, you can run it in builtin bootloader mode to get access to it, on this board the BOOT0 pin is tied to GND so it would be difficult to do it (I'll try if I can't find another solution).