Thread: calculate process mean with c programming to implement with contiki

Hi, I am starting to use contiki and learn c programming for my summer internship. I have to calculate the mean of the ongoing process of refrigerator power. I made the code like this

Code:

#include <stdlib.h>
#include <stdio.h>
#include <homadeus/processes/fridge_process.h>
#include <homadeus/devices/78M6610.h>
#include <homadeus/utils/utils.h>

float global_variable;
int current_state = 0; //down =0, up =1

float current_power = 0;
int sample[n];

float get_instant_power()

    {
        
        double scaled_value = MAXIM_78M6610_SCALING_RESOLUTION_POWER_WATTS * maxim_78M6610_get_register_int24(MAXIM_78M6610_P);
        if (scaled_value>0)    return scaled_value;
        else return 0;
    }
   

float get_sum()

    {    
    
        float sum = 0;
         float mean;
         while(1){
             for(int i=1; i<n ; i++){
                 sample[i]=get_instant_power();
                 sum +=sample[i];
             }
          }
    }

int get_current_state()

    {
          
    
         current_power = get_instant_power();
              if(current_power < 0) return 0;
              else return 1; 
    
    }


PROCESS(hmd_fridge_process, HOMADEUS_FRIDGE_PROCESS_DESCRIPTION);
PROCESS_THREAD(hmd_fridge_process, ev, data) 

    {
           static struct etimer timer;
            PROCESS_BEGIN();
            while(1){
                etimer_set(&timer, CLOCK_CONF_SECOND);
                PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&timer));
        
            }
            PROCESS_END();
    }

How it gets the value of power is handled already. Every one second, it will display the power consumed (get_instant_power()). I don't know how to start and end the sample numbre. If I start by 1 then how should it be until? Also, is it possible if I store the power in array to accumulate?