Re: [Flashforth-devel] Git(?), v5.0, and long division

[Mikael N. <mik...@pp...>]

Craig,

Here is my take on calculating the spbrg value.
It takes the CPU clock from Fcy and the baudrate and baudgenerator 
prescaler (16 or 64)
is given as input.

Not difficult at all. Just normal 16-bit Forth integer scaling stuff.

$ffaf constant spbrg

spbrg c@  . 18 ok<#,ram>

: >spbrg ( double-baud brg-prescaler -- n )
   >r
   #100 um/mod nip >r
   Fcy #40 um*
   r> um/mod nip
   r> / 1-
;

38400. 16 >spbrg  . 18 ok<#,ram>