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// See LICENSE for license details.
package chiselTests
import chisel3._
import chisel3.experimental.FixedPoint
import chisel3.testers.BasicTester
import org.scalatest._
//scalastyle:off magic.number
class FixedPointLiteralSpec 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 FixedPointFromBitsTester extends BasicTester {
val uint = 3.U(4.W)
val sint = -3.S
val fp = FixedPoint.fromDouble(3.0, width = 4, binaryPoint = 0)
val fp_tpe = FixedPoint(4.W, 1.BP)
val uint_result = FixedPoint.fromDouble(1.5, width = 4, binaryPoint = 1)
val sint_result = FixedPoint.fromDouble(-1.5, width = 4, binaryPoint = 1)
val fp_result = FixedPoint.fromDouble(1.5, width = 4, binaryPoint = 1)
val uint2fp = fp_tpe.fromBits(uint)
val sint2fp = fp_tpe.fromBits(sint)
val fp2fp = fp_tpe.fromBits(fp)
val negativefp = -3.5.F(binaryPoint = 4)
val positivefp = 3.5.F(binaryPoint = 4)
assert(uint2fp === uint_result)
assert(sint2fp === sint_result)
assert(fp2fp === fp_result)
assert(positivefp.abs() === positivefp)
assert(negativefp.abs() === positivefp)
assert(negativefp.abs() =/= negativefp)
stop()
}
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 FixedPointSpec extends ChiselPropSpec {
property("should allow set binary point") {
assertTesterPasses { new SBPTester }
}
property("should allow fromBits") {
assertTesterPasses { new FixedPointFromBitsTester }
}
}
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