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How to Set The Timers in Contiki-Ng?

Set The Timers In Contiki-Ng

Tutorial for Contiki-Ng Simulator to Set the Timers

  • Description:
    Contiki-NG provides a set of timer libraries that are used both by applications and by the OS itself. The timer libraries contain functionality for checking if a time period has passed, waking up the system from low power mode at scheduled times, and real-time tasks scheduling.
  • All the timers build on the clock module, in charge of basic system time:
    1. timer: a simple timer, without built-in notification (caller must check if expired). Safe from interrupt.
    2. stimer: same as timer, but in seconds and with significantly longer wrapping period. Safe from interrupt.
    3. etimer: schedules events to Contiki-NG processes. Unsafe from interrupt
    4. ctimer: schedules calls to a callback function. Unsafe from interrupt.
    5. rtimer: real-time task scheduling, with execution from ISR. Safe from interrupt.
  • Code:
    File location -> contiki-Ng/os/sys
    #include "sys/timer.h"
    static struct timer rxtimer;
    void init(void) {
      timer_set(&rxtimer, CLOCK_SECOND / 2);
    }
    interrupt(UART1RX_VECTOR)
    uart1_rx_interrupt(void)
    {
      if(timer_expired(&rxtimer)) {
       /* Timeout */
       ...
      }
     timer_restart(&rxtimer);
     ...
    }

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