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Swd-clk seems to be powering the chip #9

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Kwant opened this issue Jul 6, 2021 · 3 comments
Open

Swd-clk seems to be powering the chip #9

Kwant opened this issue Jul 6, 2021 · 3 comments

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@Kwant
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Kwant commented Jul 6, 2021

When trying to run the glitcher on an nrf52832 the target doesn’t fully power cycle. The voltage on dec1 actually increases a bit when IO22 is low. This effect disappears when disconnecting the swd clock line which I think is somehow backpowering the chip.

@atc1441
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atc1441 commented Jul 6, 2021

Hey.

Can you try if a digitalWrite CLK LOW before the glitch does help?

I tested it on an nRF52832 without problems

@Kwant
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Kwant commented Jul 6, 2021

Adding that in the line before the power cycle seems to do the trick. No luck on a successful glitch yet but what I see on the scope looks correct now.

@atc1441
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atc1441 commented Jul 6, 2021

Thanks for the info. Feel free to make a PR with the change

On the nRF52832 it also took longer for me. The area at the voltage drop is still the right place.

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