message: output_i2s: improve the example Matlab code for computing the coefficients
diff: //
  //Finally, here is my own Matlab code for computing the mult and div values...(again, just for Teensy 3.x??)
  /*
  +
  %choose the sample rates that you are hoping to hit
  targ_fs_Hz = [2000, 8000, 11025, 16000, 22050, 24000, 32000, 44100, floor(44117.64706) , ...
  - 48000, 88200, floor(44117.64706 * 2), (37000/256*662), 96000, 176400, floor(44117.64706 * 4), 192000];
  - F_PLL = 180e6; %choose the clock rate used for this calculation
  + 48000, 2*41000, 88200, floor(44117.64706 * 2), (37000/256*662), 96000, 176400, floor(44117.64706 * 4), 192000];
  +
  + %choose the PLL (ie, clock speed) values
  + F_PLL_all = [16e6 7236 96e6 120e6 144e6 180e6 192e6 216e6 240e6]; %choose the clock rate used for this calculation
  PLL_div = 256;
  + all_out_str = {};
  + for I_PLL=1:length(F_PLL_all)
  + F_PLL=F_PLL_all(I_PLL);
  all_n=[];all_d=[];
  +
  + out_str = ['#if (F_PLL==' num2str(F_PLL) ')'];
  + all_out_str{end+1}=out_str;
  +
  + out_str=' const tmclk clkArr[numfreqs]={';
  for Itarg=1:length(targ_fs_Hz)
  + out_str(end+1)='{';
  if (0)
  [best_d,best_n]=rat((F_PLL/PLL_div)/targ_fs_Hz(Itarg));
  else
  all_n(Itarg) = best_n;
  all_d(Itarg) = best_d;
  disp(['fs = ' num2str(targ_fs_Hz(Itarg)) ', n = ' num2str(best_n) ', d = ' num2str(best_d) ', true = ' num2str(F_PLL/PLL_div * best_n / best_d)])
  + out_str=[out_str num2str(best_n) ', ' num2str(best_d) '}'];
  + if Itarg < length(targ_fs_Hz)
  + out_str=[out_str ', '];
  end
  + end
  + all_out_str{end+1}=out_str;
  + end
  + all_out_str{end+1} = '#endif';
  +
  + %print out the full code to past into output_i2s
  + strvcat(all_out_str)
  +
  */
  