I have been trying to perform glitching attacks under a system but after successfully connecting everything and having the target device running on the CWLite Clock I found out the CW303 CLK shorted with GND, any idea why have this happened?
The modifications I made can be seen on the following diagram dropbox.com/s/dvts2muhgknt1 … p.png?dl=0 :
- Cut the line on the target to remove the pcb clock source and soldered a wire to the CW303 R72 so both share the same clock signal. The input target tolerates up to 5V.
- I connected both boards CW303 and Target GNDs
- Connected Measure/Glitch input to the Target VCC
After successfully running the Target with this modification when I went back to program the CW303 XMEGA so I could trigger some process on the target system I realized that the UART wasn’t working and check the Clock signals, OK on the CWLite Side but ugly (Amplitude 700mV) on the Xmega PIN37. It turns out that the pin37 is now shorted with GND.
Was something wrong with my setup?