Control Phase on NCO

Beau Schwabe

Chip,

Your code works well, but I want to add, that you must put an RC filter off of the pin in order for it to look like what you would expect.

Here is a demo (modified from your original) that just sweeps the Sine Phase on one of the pins. It uses the same "phase" object.

[b]CON[/b]

  [b]_clkmode[/b] = [b]xtal[/b]1 + [b]pll[/b]16x
  [b]_xinfreq[/b] = 5_000_000

  Hz = $8000_0000 / 125_000
  Deg = $8000_0000 / 180

[b]VAR[/b]
  [b]long[/b]  freq, offset

[b]OBJ[/b]
  phase : "phase"

[b]PUB[/b] start

  'start phase
  phase.start(0, 1, @freq)

  '(phase object continuously reads freq and offset)
  freq    := 1000 * Hz
  offset  := 0
  
  
  [b]repeat[/b]
    offset += Deg/100          'Increment Phase by .01 Deg

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

MrPitts

Wow Guys!! You are all awesome. My originial question was probably a bit misleading from the intended need, however, Chip, Beua and rokicki put me on the right path. You all rock! Thanks for all the valuable information.

I love the propeller! What an awesome chip. I see no limit to its potential. It's really got me jazzed about embedded applications again. Parallax has restored my faith.

Best regards,

Ron