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Force get access to Cortex-M0 if SWDIO is disabled on startup.

YurySokolov

Hi,

I have MCU based on Cortex-M0. While developing bootloader i left code which disables SWDIO by mistake. Now i can not get access to MCU. It starts and immediately disables SWDIO.

1. I can not use RESET pin, reset function seems disabled by default on this MCU. Tried pull up/down but it always starts.

2. I can not attach debugger before MCU disables SWDIO. Seems not enough time.

Any suggestions how to get access to this MCU ?