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Radio on Radio off Protothreads – Simplifying Event-driven Programming t 0 t awake t wait_max t sleep Communication left… No blocking wait! 1. Turn radio on. 2. Wait until t = t_0 + t_awake. 3. If communication has not completed, wait until it has completed or t = t_0 + t_awake + t_wait_max. 4. Turn the radio off. Wait until t = t_0 + t_awake + t_sleep. 5. Repeat from step 1. Problem: with events, we cannot implement this as a five-step program!
Event-driven state machine implementation: messy Radio on Radio off t 0 Timer expires t awake ON Timer expires OFF t wait_max t sleep Communication left… Timer expires WAITING Communication completes, timer expires enum {ON, WAITING, OFF} state; void eventhandler() { if(state == ON) { if(expired(timer)) { timer = t_sleep; if(!comm_complete()) { state = WAITING; wait_timer = t_wait_max; } else { radio_off(); state = OFF; } } } else if(state == WAITING) { if(comm_complete() || expired(wait_timer)) { state = OFF; radio_off(); } } else if(state == OFF) { if(expired(timer)) { radio_on(); state = ON; timer = t_awake; } } }
Page 1 and 2: Contiki COOJA Crash Course Thiemo V
Page 3 and 4: • Core group WISENET Acknowledgem
Page 5: Contiki Pioneering features: • TC
Page 9 and 10: The Coffee file system [IPSN 2009]
Page 11 and 12: Protocol stacks Protocol stacks in
Page 13 and 14: CPU Linear current draw Sensors Lis
Page 15 and 16: New: Per-packet Power Profiling Bro
Page 17 and 18: Hands-on You should have or should
Page 19 and 20: Hello World on Tmote Sky To downloa
Page 21 and 22: • contiki/core Contiki directorie
Page 23 and 24: •struct timer Timers in Contiki
Page 25 and 26: First Task: Hello World in MSPSim:
Page 27 and 28: Extend Hello World to toggle LEDS a
Page 29 and 30: Button Press Code Fragement #includ
Page 31 and 32: Protothread Limitations • Automat
Page 33 and 34: COOJA • cd tools/cooja • Type
Page 35 and 36: trickle collect Rime map (partial)
Page 37 and 38: Rime Programming Model •Callbacks
Page 39 and 40: Exercise: Networking with Rime Broa
Page 41 and 42: Change MAC layer By default, Contik
Page 43 and 44: Power consumption You could use ene
Page 45 and 46: Measure Power Consumption with Ener
Page 47 and 48: Go to examples/sky-shell make TARGE
Page 49 and 50: Shell Also cool, test (with X-MAC o
Page 51 and 52: Watchpoint exercise: Check Output T
Page 53 and 54: More stuff Look at Section 7.7 for

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