Sin Table Printout

Kye · 2009-11-08 22:17

Anyone have a propeller chip sine table print out from the ROM?

Thanks,

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Nyamekye,

Phil Pilgrim (PhiPi) · 2009-11-08 22:38

It's easy enough to produce one whenever you need it:

[b]CON[/b]

  [b]_clkmode[/b]      = [b]xtal1[/b] + [b]pll16x[/b]
  [b]_xinfreq[/b]      = 5_000_000

[b]OBJ[/b]

  io    : "FullDuplexSerial"

[b]PUB[/b] start | i

  io.start(31, 30, 0, 9600)
  [b]repeat[/b] i [b]from[/b] $e000 to $f000 step 2
    io.hex([b]word[/b][noparse][[/noparse]&#173;i&#093;, 4)
    [b]if[/b] (i & 31 == 30)
      io.tx(13)
    [b]else[/b]
      io.tx(" ")

-Phil

Tracy Allen · 2009-11-09 03:59

Kye,

See:
errors in sine table (Not)
http://forums.parallax.com/showthread.php?p=840653
and PhiPi's followup in
renormalizing the sine table (Maybe)
http://forums.parallax.com/showthread.php?p=841875

I'm attaching my exploratory xls file that compares the Prop table with the normalizations (65535=unity versus 65536=unity). The Prop actually uses the former, and Phil looked at 65536 as an alternative. Possible interpolation came up. Note that at the high end, there are six angles that all map to 65535, so there is no grist there for easy interpolation.

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Tracy Allen
www.emesystems.com

Sin Table Printout

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