A clear and simple flow

Hi all,

if I look in the SAMD21G datasheet PA12, PA13, PA14 and PA15 (TDI, TCK, TDS, TDO) are on pins 21,22,23 and 24.

So board's schematic and SAMD21G datasheet are coherent :slight_smile:

Now looking in the samd21g18a.h file in the arduino's package PA12..PA15 are define from 12 to 15.

So, and it's of course to be confirmed by arduino's guys , I think it's one right method to associate port number, Pin and #define.

Update : I was wrong : values from 12 to 15 work only with low level jtag functions.
All other arduino's functions have to use values from 26 to 29