How to use the ST-LINK V2 for debugging using 'printf' ?

[HKUMA.4]

Hello,

I have a ST -LINK V2 programmer. 

I use it with Nordic nRF51822 to program the nRF via SWD.

I want to debug my code by using 'printf' commands using the same ST-LINK V2; is it possible?

If yes, how ?

What is the SWIM pin for ?

Thanks.