Re: Problems with IOblix serial ports

[John Klos <john%klos.com@localhost>]

Followup: 38400 baud on the IOblix port works with 9600 on the other end, 
as do any lower baud rates (tried 19200, 9600, 4800 and 1200), but 57600 
and 115200 don't work.

I suppose I'll have to use the A2232 for 115200.

Patrick made these nice division tables. Perhaps someone can explain how 
we're getting some of these baud rates from a 24 MHz oscillator? Or is 
9615 baud close enough to 9600 that it doesn't matter much?

I can see why the 22.1184 MHz oscillator is preferred...

Crystal at 24.000000MHz
    300    5000  0.00%
    600    2500  0.00%
   1200    1250  0.00%
   2400     625  0.00%
   4800     312 50.00%
   7200     208 33.33%
   9600     156 25.00%
  14400     104 16.66%
  19200      78 12.50%
  28800      52  8.33%
  38400      39  6.25%
  57600      26  4.16%
  76800      19 53.12%
 115200      13  2.08%
 230400       6 51.04%
 460800       3 25.52%
 921600       1 16.15%

Crystal at 22.118400MHz
    300    4608  0.00%
    600    2304  0.00%
   1200    1152  0.00%
   2400     576  0.00%
   4800     288  0.00%
   7200     192  0.00%
   9600     144  0.00%
  14400      96  0.00%
  19200      72  0.00%
  28800      48  0.00%
  38400      36  0.00%
  57600      24  0.00%
  76800      18  0.00%
 115200      12  0.00%
 230400       6  0.00%
 460800       3  0.00%
 921600       1  3.39%

Thanks,
John