Sense

This program periodically periodically samples the battery sensor and displays the bottom 3 bits on the LEDs

/*
* periodically sample the battery sensor and display the bottom 3 bits on the leds
*/

type ISense is interface ( in bool ticker;  out bool battReq; in integer battVal)

component sense presents ISense {
    constructor() {}

    behaviour {
        receive tick from ticker
        send true on battReq
        receive reading from battVal

        if (reading & 4) == 4
            then setRedLedPower(true)
            else setRedLedPower(false)
        if (reading & 2) == 2
            then setBlueLedPower(true)
            else setBlueLedPower(false)
        if (reading & 1) == 1
            then setGreenLedPower(true)
       	    else setGreenLedPower(false)
    }
}

s =  new sense()
connect s.battReq to sensors.batteryRequest
connect s.battVal to sensors.batteryOut
setTimer(s.ticker , 0.098 , true)

The corresponding nesC program for TinyOS is shown below.

configuration SenseAppC
{
}
implementation { 

  components SenseC, MainC, LedsC, new TimerMilliC(), new DemoSensorC() as Sensor;

  SenseC.Boot -> MainC;
  SenseC.Leds -> LedsC;
  SenseC.Timer -> TimerMilliC;
  SenseC.Read -> Sensor;
}
/******************************************************/
#include "Timer.h"

module SenseC
{
  uses {
    interface Boot;
    interface Leds;
    interface Timer;
    interface Read;
  }
}
implementation
{
  // sampling frequency in binary milliseconds
  #define SAMPLING_FREQUENCY 100

  event void Boot.booted() {
    call Timer.startPeriodic(SAMPLING_FREQUENCY);
  }

  event void Timer.fired()
  {
    call Read.read();
  }

  event void Read.readDone(error_t result, uint16_t data)
  {
    if (result == SUCCESS){
      if (data & 0x0004)
        call Leds.led2On();
      else
        call Leds.led2Off();
      if (data & 0x0002)
        call Leds.led1On();
      else
        call Leds.led1Off();
      if (data & 0x0001)
        call Leds.led0On();
      else
        call Leds.led0Off();
    }
  }
}