I've been trying to program my ATSAMD20J18 with a J-LINK EDU without any success so far. I am using the SWD interface.
I can read the VTREF with the J-LINK, but when it comes to programming it is unable to read the device ID (signature). I have checked my connections multiple times, but maybe I am missing something.
VTREF (pin 1) -> Board supply (3V ~)
SWCLK(pin 9) -> SWCLK (PA30)
SWDIO(pin 7) -> SWDIO (PA31)
RESET(pin 15) -> RESET (pin 51)
GND (any even pin except 2) -> Board ground
I read in the datasheet of ATSAM that a 1k pullup resistor on SWCLK is recommended, yet in the J-LINK doc they don't mention it. On the other hand, in the JLINK doc they recommend a 100kohms resistor on SWDIO.
I am a beginner with ATSAM MCU's , so forgive me if there is anything obvious I am missing.
If anyone has experience with programming with the J-LINK any help is appreciated!
Thank you =)