hello_adc.c

#include "contiki.h"
#include <stdio.h>
#include "adc.h"

PROCESS(hello_adc_process, "Hello ADC Process");
AUTOSTART_PROCESSES(&hello_adc_process);

PROCESS_THREAD(hello_adc_process, ev, data)
{
    PROCESS_BEGIN();

    printf("Hello, world!\n");

    //Enable all external interupts 
    EIMSK = 0xff;
    
    //Enable listening to all interupts (on rising edge)
    EICRA = 0x03;

    while(1)
    {
        PROCESS_WAIT_EVENT();
    }

    PROCESS_END();
}

ISR(INT0_vect)
{
    int p = readADC(0);
    printf("ADC=%d\n",p);
}