I met an issue regarding the voltage glitching while many experiences on various targets.
In fact, with CW-Lite to perform attack and CW308 baseboard to plug my targets, I used a T-connector to insert glitch, then to get the waveform on an external oscilloscope.
I well see the glitch waveform on my oscilloscope but the normal target functioning (before the glitch) isn’t 3.3V as expected on many targets such as : XMEGA, STM32L5 and STM32F1. I tested it !
Below, you can watch the waveform of the glitch generated on XMEGA target and the 3,3V isn’t here just as the low voltage glitch (almost 0V) thanks to CW-Lite test report.
Another screenshot but this time with a STM32L5 board (there is 2 adjacent glitch) …
About my hardware configuration:
-I used the 20-pin connector to supply C308 baseboard and so the power rail
-I put J4 on default position meaning that “VREF Network set by VREF Pin from Victim Board”
- I put J14 on default position meaning that “Filter input set by FILT Pin from Victim Board”
-I used the 24Mhz clock provided by the CW-Lite, and so J3 is in the 3rd position
- I used a multimeter to measure the voltage of before and after the “shunt resistor”(R3) and I get 3,27V.
In all those case, could you please explain me why I don’t manage to see 3,3V on my oscilloscope screen ? Then, why the glitch waveform don’t tend to almost 0V as in the CW-Lite test report ?
Another special thing I remark, when I connect my oscilloscope to my T-type sma connector, I can’t even attack my embedded code even though I have the right configurations… do you have an explanation about that issue ?
Thank you by advance !