Problem with USART communication in low-level

[danulduzu_f]

I solved it using the last code and adding these lines:

  int d_num = (int) num;
  float frac = num - d_num;
  int frac1 = frac * 100; 
  sprintf(str, "%d.%0.2d\n", d_num, frac1);

I refered to here