Re: GNAT for AVR - Mathematical Functions

[Aurele Vitali <aurele.vitali@gmail.com>]

I don't know anything about the ATmega328P, but if it uses a builtin floating point processor, you can use Ada inline floating point assembler.  Its not hard to do. Here is a simple example of the square root function:

  with System.Machine_Code; use System.Machine_Code;

  function Sqrt( x : in Long_Float ) return Long_Float is
    Result : Long_Float := 0.0;
  begin
    Asm( ( "fldl  %1" & EOL &                 -- Load x in St(0)
           "fsqrt   " & EOL &                 -- Take the Sqrt of St(0)
           "fstpl %0" ),                      -- Store result and pop St(0)
         Outputs => ( Long_Float'Asm_Output("=m", Result ) ),
         Inputs  => ( Long_Float'Asm_Input ( "m",      x ) ) );
    return Result;
  end Sqrt;

You can do the same thing for trig functions...  Just cut and past and see if this example works. 

Cheers