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No Cortex-M SW Device Found

Brian Acock

I have a device which I have flashed numerous times over this past week. I recently implemented a new debug connection (to replace my hack solder job), and was able to flash without issue.

Fast forward a few hours - I am now continually getting the "No Cortex-M SW Device Found" error. I think of 40+ attempts, two were able to successfully flash. I have verified all my connectivity.

What really gets me is the inconsistency - why would ~2 of 40 attempts work, but the other 38 fail? Any ideas on how to fix this issue?

Thanks in advance!

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    I have a STM32f100 uC which I tried to flash for the 1st time through SW STM32f100 VL discovery board.
    I wired the power and GND to 3.3V and ground, respectively and PA13 and PA14 to SWDIO and SWCLK.
    I also wired the reset pin to momentary low, and BOOT0 to low.
    However I always get 'No Cortex-M device found' error. Any idea what I did wrong? Or would you mind sharing the flashing circuit?

    Thanks

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  • 0

    I have a STM32f100 uC which I tried to flash for the 1st time through SW STM32f100 VL discovery board.
    I wired the power and GND to 3.3V and ground, respectively and PA13 and PA14 to SWDIO and SWCLK.
    I also wired the reset pin to momentary low, and BOOT0 to low.
    However I always get 'No Cortex-M device found' error. Any idea what I did wrong? Or would you mind sharing the flashing circuit?

    Thanks

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