FWIW, I connected a Segger JTAG to the ATSAMD21G18A -
The connector for the Atmel JTAG:
MRK4K Upside Down:
===========================================
1 = =
===| 5 3 1 = =
| || || || = =
===| || || || = =
(USB) 6 4 2 = =
===========================================
J7 J11
1 - VTref
2 - SWDIO
3 - Reset(n)
4 - SWCLK
5 - GND
6 - NC
I have also attached a .bin file of the Atmel memory.
Regards,
John W.
MKR4000-AtmelSAMD21G18A.zip (32.3 KB)