!! On Swimtracker board the JTAG pins are not labeled correctly ! 
one pin even needs to be soldered manually


------|------|-----------------
GND   |      | schwarz
3.3V  |      | rot
IO13  | TCK  | weiss
IO14  | TMS  | grau
IO12  | TDI  | lila
IO15  | TDO  | blau
EN    |      | grun
IO0   |      | braun
RXD   |      | orange
TXD   |      | gelb