src/test/scala/chiselTests/FixedPointSpec.scala


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// See LICENSE for license details.

package chiselTests

import chisel3._
import chisel3.testers.BasicTester
import org.scalatest._

//scalastyle:off magic.number
class FixedPointSpec extends FlatSpec with Matchers {
  behavior of "fixed point utilities"

  they should "allow conversion between doubles and the bigints needed to represent them" in {
    val initialDouble = 0.125
    val bigInt = FixedPoint.toBigInt(initialDouble, 4)
    val finalDouble = FixedPoint.toDouble(bigInt, 4)

    initialDouble should be(finalDouble)
  }
}

class SBP extends Module {
  val io = IO(new Bundle {
    val in =  Input(FixedPoint(6, 2))
    val out = Output(FixedPoint(4, 0))
  })
  io.out := io.in.setBinaryPoint(0)
}
class SBPTester extends BasicTester {
  val dut = Module(new SBP)
  dut.io.in := FixedPoint.fromDouble(3.75, binaryPoint = 2)

  assert(dut.io.out === FixedPoint.fromDouble(3.0, binaryPoint = 0))

  stop()
}
class SBPSpec extends ChiselPropSpec {
  property("should allow set binary point") {
    assertTesterPasses { new SBPTester }
  }
}