Dear Administrator 
 
The code above are worng. You need include the folowwing line and modifications 
 
1) #include  
2) %06u replace for %06lu 
 
 
The folowing code are incomplet or wrong 
============================= 
ISR(TIMER1_CAPT_vect) 
{ 
if(calculate==0) 
{ 
TCNT1=0; 
calculate=1; 
} 
else if (calculate==1) 
{ 
//Saving current timer value on falling edge 
CurrentTime=ICR1; 
calculate=2; 
}  
else if(calculate==2) 
{ 
CurrentTime=ICR1; 
T=(uint32_t)CurrentTime; 
//form string with RPM value 
sprintf(buffer,"RPM: %06lu",RPM/