Function quick reference

Sensor functions

Each sensor has a set of functions for controlling it and query it for its state. Some sensors also generate an events when the sensors change. A sensor must be activated before it generates events or relevant values.

• SENSORS_ACTIVATE(sensor) - activate the sensor
• SENSORS_DEACTIVATE(sensor) - deactivate the sensor
• sensor.value(0) - query the sensor for its last value

• sensors_event - event sent when a sensor has changed (the data argument will referer to the actual sensor)

Example for querying the button:

• SENSORS_ACTIVATE(button_sensor) - activate the button sensor
• button_sensor.value(0) - the button has been pressed or not

Sensor on the ESB platform

• battery_sensor - query the battery voltage level
• button_sensor - query the on-board button
• pir_sensor - query the passive IR sensor (motion detector)
• radio_sensor - query the radio signal strength
• sound_sensor - query the microphone
• temperature_sensor - query the temperature sensor
• vib_sensor - query the vibration sensor

LED functions

• leds_on() - turn LEDs on
• leds_off() - turn LEDs off
• leds_invert() - invert LEDs
• leds_blink() - blink all LEDs

Beeper functions

• beep() - click the beeper
• beep_beep() - beep
• beep_down() - pitchbend down beep
• beep_quick() - a number of quick beeps
• beep_spinup() - pitchbend up beep

Timer functions

Contiki provides a set of timer libraries. Event timers generates an event when the timer expires and callback timers call a function when the timer expires. The simple timers on the other hand have to be actively queried to check when they have expired.

Event timers

• etimer_expired() - check if an event timer has expired
• etimer_set() - set an event timer
• etimer_reset() - set an expired event timer to the next interval
• etimer_restart() - restart an event timer from the current point in time

Callback timers

• ctimer_expired() - check if a callback timer has expired
• ctimer_set() - set a callback timer
• ctimer_reset() - set an expired callback timer to the next interval
• ctimer_restart() - restart a callback timer from the current point in time

Simple timers

• timer_expired() - check if a simple timer has expired
• timer_set() - set a simple timer
• timer_reset() - set a simple event timer to the next interval
• timer_restart() - restart a simple timer from the current point in time