Help needed with Tutorial A3 VCC Glitching XMEGA Target


#21

Hi Alex,

Despite changing to a shorter SMA cable, I still did not manage to VCC glitch the F0 board using 7.37MHz.
The length of SMA cable does, however, affect the results.

60cm SMA Cable that came with the CW1200 kit

15cm SMA from CWLite 2-piece version

Any suggestions?

Regards,
Melvin.


#22

Hi Melvin,

I’d recommend focusing your glitching more around the area before the target crashes and using a finer width. Typically, you won’t get glitches in areas where you mostly see crashes. I’m not sure if you’ve tried this already either, but it may be worth trying each setting more than once (you may see glitches happen under 20% of the time with your best settings). There’s also a high power glitch setting that might be better in your case.

Alex


#23

Hi Alex,

Thanks for the tips.
Just to share, I kinda obtained similar glitch plot when I was working on the xmega target last month. Interestingly enough, I managed to glitch it at one of the boundaries, i.e. just before it crashes and reset, but it required glitch repeat = 21 (● ̄(エ) ̄●)

Lucky shot I guess.
This technique doesn’t seem to work on the STM32 F0 and F3 boards though (⌣_⌣”)

Regards,
Melvin.


#24

Hi Alex,

Can I check what’s your UFO board settings, e.g. Jumpers, Switches S1-S8, LDOs, etc.?
Thanks.

Regards,
Melvin.


#25

Hi Melvin,

My CW308 settings are as follows:
J1 is set to J5-VREF
J3 is set to HS2/OUT
EXT_DC SWITCH is set to ON
VCC3.3 and VCC1.2 are both on
J14 is jumpered with the two pins closest to the target board

That should be it.

Alex