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• Constants.scala

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chisel.lib.cordic.iterative.Constants.scala Maven / Gradle / Ivy

// See README.md for license details.

package chisel.lib.cordic.iterative

import breeze.numerics.{atan, pow, sqrt}

/**
  * Object for computing useful constants
  */
object Constants {

  /**
    * Get sequences of length n that go 1.0, 0.5, 0.25, ...
    */
  def linear(n: Int): IndexedSeq[Double] = for (i <- 0 until n) yield pow(2.0, -i)

  /**
    * Get gain for n-stage CORDIC
    */
  def gain(n: Int): Double = linear(n).map(x => sqrt(1 + x * x)).reduce(_ * _)

  /**
    * Get sequences of length n that go atan(1), atan(0.5), atan(0.25), ...
    */
  def arctan(n: Int): IndexedSeq[Double] = linear(n).map(atan(_))
}