FADD

FPU.LOADBYTE(variable); // Write signed byte to register 0 and Convert to float

example 1:

#include<LCD4_128.h>
#include<FPU_128.h>

void main()
{

   float f;
   char c;

   Init_Fpu();    // Initialize FPU
   Lcd_init();     // Initialize LCD

   c = -128;
   FPU.LOADBYTE(c);

   FPU.SELECTA(1);

   FPU.FSET(0);
   f = FPU.FREAD(1);

   LCD.PRINT(f); // will print -128.0

}