High-Performance Embedded Computing

20 Chapter 1 Embedded Computing

program includes one set of functions known as events. The program may also

include functions called commands to help implement the program, but another

component uses the events to call the program. A set of components can be

assembled into a system using interface connections known as wiring.

TinyOS executes only one program using two threads: one containing tasks

and another containing hardware event handlers. The tasks are scheduled by

TinyOS; tasks are run to completion and do not preempt each other. Hardware

event handlers are initiated by hardware interrupts. They may preempt tasks or

other handlers and run to ...