Difference: FloatingPointUnit (29 vs. 30)

Revision 302022-11-15 - PeterSchmid

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Do not use FPU in interrupt service routines.
Tasks/Threads with FPU operations need much more return stack depth.

Changed:

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Rounding is not very useful for precision more than 3.

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Rounding is not always working properly. useful for precision more than 3.

0.1005e fs. 1.01E-1  ok.
0.1005e fm. 101m ok.
4 set-precision
0.100005e fs. 1.0000E-1  ok.
0.100005e fm. 100.00m ok.

Added:

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1.00005e f>x x. 1,00004994869232177734375000000000 ok. 1,00005 x. 1,00004999991506338119506835937500 ok.

Line: 238 to 240

How to Use

Added:

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: f|| ( r1 r2 -- r3)

Changed:

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2dup * -rot + /

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2dup f* -rot f+ f/

;

Changed:

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27k 100k f|| fm.

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27k 100k f|| fm. 21.3k ok.

: f. ( r -- )  \ display, with a trailing space, the floating-point number r in fixed-point notation
  $3F000000 \ .5
  precision 0 do
    $41200000 f/ \ 10.0 / 
  loop
  f+            \ round
  f>x
  <# 
     0 #s 2drop    \ integer part
     46 hold<       \ decimal point
     precision 0 do
       x#             \ fract digit
     loop
     dup
  #> 
  type space
;

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