Working with floating point

Hi all,

Thanks for all the help I've got in the past, my current project is accumulate a value from analog input (integrate over time) and then display the integrated average on the serial i/f LCD display used in the RSS weather project.

I get stuck when it comes to converting the Double to string using fcvt():

void Energizer( int id ) // code that will get called by the timer every 1000 ms.
{
  int value=0,i,dec_pt,sign;
  double P,U,R=100; //R=100 ohm
  static double E=0;

  value=AnalogIn_GetValue( 7 );
  U=(value/1023*3300); //U expressed in mV
  P=U*U/R; //P expressed in mW
  E+=P*1; // E expressed in mJ, t=1 s
  Display(fcvt(E,3, &dec_pt,&sign));
}

Display(char *msg) //sends textstring to LCD

Only garbage comes out, also when E=1.5!
Is there something about fcvt() i misunderstood?

(Display() works fine with "Hello World" and such)

Any help is greatly appreciated
Kell Skogh

Ok, this seems a tough lesson..
seems there is no soft FP support???

So I gave up and tried doing the math in integer (will probably screw everything up but got to try something..)
so I tried the itoa() function in stdlib =
...which isn't there either, or? Oddly the fcvt() seemed to link..

My goal is to do some math, and send the result as a text string to a display via the serial port. doesn't seem hard, but unfortunately I don't seem to manage so... Help!

Hmmm sprintf() seems to be one way?

Thanks
/Kell