#include "contiki.h"
#include "dev/leds.h"

#include <stdio.h> /* For printf() */
/*---------------------------------------------------------------------------*/
/* We declare the two processes */
PROCESS(hello_world_process, "Hello world process");
PROCESS(blink_process, "LED blink process");

/* We require the processes to be started automatically */
AUTOSTART_PROCESSES(&hello_world_process, &blink_process);
/*---------------------------------------------------------------------------*/
/* Implementation of the first process */
PROCESS_THREAD(hello_world_process, ev, data)
{
    // variables are declared static to ensure their values are kept
    // between kernel calls.
    static struct etimer timer;
    static int count = 0;
    
    // any process mustt start with this.
    PROCESS_BEGIN();
    
    // set the etimer module to generate an event in one second.
    etimer_set(&timer, CLOCK_CONF_SECOND);
    while (1)
    {
        // wait here for an event to happen
        PROCESS_WAIT_EVENT();

        // if the event is the timer event as expected...
        if(ev == PROCESS_EVENT_TIMER)
        {
            // do the process work
            printf("Hello, world #%i\n", count);
            count ++;
            
            // reset the timer so it will generate an other event
            // the exact same time after it expired (periodicity guaranteed)
            etimer_reset(&timer);
        }
        
        // and loop
    }
    // any process must end with this, even if it is never reached.
    PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/* Implementation of the second process */
PROCESS_THREAD(blink_process, ev, data)
{
    static struct etimer timer;
    static uint8_t leds_state = 0;
    PROCESS_BEGIN();
    
    while (1)
    {
        // we set the timer from here every time
        etimer_set(&timer, CLOCK_CONF_SECOND / 4);
        
        // and wait until the vent we receive is the one we're waiting for
        PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_TIMER);
        
        // update the LEDs
        leds_off(0xFF);
        leds_on(leds_state);
        leds_state += 1;
    }
    PROCESS_END();
}
/*---------------------------------------------------------------------------*/