interrupt [TIM2_OVF] void timer2_ovf_isr(void)
{
        // Stop timer
        TCCR2=0x00;

        if(get_incoming_pkt()==3){
        
                switch (check_command(myip)) {
                
                case 0:
                        strcpyf(service_msg, "Micro_device#0:not_a_command");
                        service_msg[13]=device_id;
                        send_to_server(service_msg, service_msg_len);                
                break;
                                
                case 1:
                        init_ip_arp_udp(mymac,myip);
                        strcpyf(service_msg, "Micro_device#0:IP_changed");
                        service_msg[13]=device_id;
                        send_to_server(service_msg, service_msg_len);                
                break;
                
                case 2:
                        strcpyf(service_msg, "Micro_device#0:comm_2_done");
                        service_msg[13]=device_id;
                        send_to_server(service_msg, service_msg_len);                
                break;                
      
                default:
                        strcpyf(service_msg, "Micro_device#0:command_Error");
                        service_msg[13]=device_id;
                        send_to_server(service_msg, service_msg_len);
                };                      
        };        
                
        // Start timer
        TCCR2=0x07;
        TCNT2=0x00;
} // end of interrupt


void main(void)

....
unsigned int* pointer;
......

          pointer=get_adc_data();
          for(i=0;i<6;i++){    
                data_msg[16+2*i]=(*(pointer+i))>>8; //MSB
                data_msg[16+2*i+1]=(*(pointer+i)) & 0xff; //LSB
          };

......

unsigned int* get_adc_data(void)
{
unsigned char i;
unsigned int adc_data=0;
unsigned int analog_vals_arr[6]={0,0,0,0,0,0};

// ADC Clock frequency: 130,156 kHz
ADCSRA=0x86;// ADC enable; ADC int.disable; prescaler=64

TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
TCCR1B=0x03;// clk/64


do{
for (i=0; i<6; i++)
{
ADMUX&=0b11110000;
ADMUX|=i;
ADCSRA|=0x40;
while(!(ADCSRA & (1<<ADIF)));
ADCSRA|=(1<<ADIF);

adc_data=ADCW;
check(adc_data, i);

};

// check timer1 overflow flag
if (TIFR &= (1<<TOV1))
{
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
TIFR |= (1<<TOV1);
timer1(analog_vals_arr);
break;
};

}
while(1);

ADCSRA clrb(ADEN);//stop ADC
return (analog_vals_arr);
}

...
#asm("cli")
TCNT1H=0x00;
TCNT1L=0x00;
#asm("sei")
...
#asm("cli")
adc_data=ADCW;
#asm("sei")
...