Dynamic Tick API
Because hardware timers are programmed in the BSP, µC/OS-III only provides the function declarations for OS_DynTickGet() and OS_DynTickSet(); the BSP developer is required to implement them correctly to support Dynamic Tick. OSTimeDynTick() is defined by the OS and called from the Tick ISR, similarly to OSTimeTick(). However, unlike OSTimeTick() it passes an argument to the OS: the number of ticks that have elapsed.