dalsi upravicky.. uz nevim jake.. bohuzel..
tim3 ticking on 1 sec interval
to create timer example for libopencm3 from this - world_time -> tim3_isr, timtick_setup
tim_ 10ms counter
half done ultras -> for compare mode -> befor continuing
https://gitorious.org/mdr32f9-libopencm3/mdr32f9-libopencm3-examples/source/92624b7d011864bb003e7125aa360535aa402bb8:examples/stm32/f1/stm32-h103/timer/timer.c#L153
ultrsound working
-> writing timer structure / or try to update libopencm3