UART started.

UART started.
 pm_evt_handler 1
                   pm_evt_handler 5
                                     pm_evt_handler 8
                                                       pm_evt_handler 2
                                                                         pm_evt_handler 8
          pm_evt_handler 8
                           hellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohello