AnsweredAssumed Answered

Sawtooth on reset line

Question asked by Grzegorz Mikitiuk on Feb 27, 2019
Latest reply on Feb 28, 2019 by Jing Pan


Yesterday i was using my custom board with K22 microcontroller just fine. Today my board is not working at all

at first i had some hardfaults using code which was working just fine for atleast a month, then i could program it but i had weird messages about breakpoint at adress :0xffffff and my code didn't even start. After a while i can't even program it. I measured reset line and there is sawtooth signal there.


Some facts about my board:

NMI_b got external pullup

Reset_b got external pullup

Programming through SWD


I tried all sorts of kinetis unlock and erase_all_pin scripts when i could talk to uc and it didn't help, now i can't even communicate with board because of this reset i guess.


Any help would be appreciated