Bypassing LPC 1114 problems

1

Hi,

I ran into an issue with the LPC 1114 fuse bypass tutorial. I connect it and everything, but I have some problems.

  1. I tried to run this code block. But when the 6 raw code ran, my chip sometimes turned off. In this case, I checked the power pin with osilloscope, I could see the chipwhisperer didn’t offer the power to chip. So, What is the role of 6 raw code and Why the problem occered?
    image

  2. Anyway, upon problem sometimes occured. So if it didn’t occured, I could perform glitch injection. I could see the glitch through my osilloscope after nrst signal. But anything happened!!!. Of course, I changed the glitch parameters(repeat, offset). So I want to know the exact values of those parameters that you can succeed.

Thanks,
Songdd.

2

This is hard to diagnose, but based on this and your previous post, it sounds like your target is not operating correctly; I would double-check that all the target modifications have been made correctly and that you have no shorts.
Jean-Pierre

3

Um, actually I didn’t use the same dev board used in the tutorial, but I use another dev board which have same chip(LPC 1114). So, I tried to make same condition with tutorial. I mean I make same target modifications using pin map.

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Compared to upon original modifications,

  1. I short PIO0_1 to GND to put the device in bootloader mode.(BLD_E is connected to PIO0_1 in orignal dev board)
  2. Solder a wire GND to P0_3(make same modification)
  3. Remove all bypass capacitor.
  4. No trace in my dev board.
  5. Add a 12 ohm resistor between 3.3V & CW
  6. Add an SMA connector to the board and connect VCC … (make same modification)
  7. Add a header pin/wire to RST… (make same modification)

then, I think I connect lpc1114 and chipwhisperer correctly after this modification.

thanks,
Songdd