wip: Update Chisel from 6.5.0 to 7.0.0

`UnknownWidth` became a `case object` in this Chisel PR:
chipsalliance/chisel#4242

The `connectFromBits` method was removed in this Chisel PR:
chipsalliance/chisel#4168

.github/workflows/test.yml

@@ -20,8 +20,8 @@ env:
   VERILATOR_REPO: https://github.com/verilator/verilator
   VERILATOR_DIR: verilator
   VERILATOR_VERSION_TAG: v4.228
-  FIRTOOL_VERSION: v1.62.0
-  FIRTOOL_VERSION_TAG: firtool-1.62.0
+  FIRTOOL_VERSION: v1.77.0
+  FIRTOOL_VERSION_TAG: firtool-1.77.0
 
 jobs:
   test:

build.sbt

@@ -12,7 +12,7 @@ scalacOptions ++= Seq(
   "-language:reflectiveCalls",
   "-Ymacro-annotations"
 )
-val chiselVersion = "6.5.0"
+val chiselVersion = "7.0.0-M2"
 addCompilerPlugin("org.chipsalliance" %% "chisel-plugin" % chiselVersion cross CrossVersion.full)
 libraryDependencies ++= Seq(
   "org.chipsalliance" %% "chisel" % chiselVersion,

src/main/scala/fixedpoint/FixedPoint.scala

@@ -26,7 +26,7 @@ import chisel3.util.Cat
 object FixedPoint extends NumObject {
 
   /** Create a FixedPoint type with inferred width. */
-  def apply(): FixedPoint = apply(UnknownWidth(), BinaryPoint())
+  def apply(): FixedPoint = apply(UnknownWidth, BinaryPoint())
 
   /** Create a FixedPoint type or port with fixed width. */
   def apply(width: Width, binaryPoint: BinaryPoint): FixedPoint = new FixedPoint(width, binaryPoint)
@@ -42,15 +42,15 @@ object FixedPoint extends NumObject {
     * Use PrivateObject to force users to specify width and binaryPoint by name
     */
   def fromBigInt(value: BigInt, binaryPoint: BinaryPoint = 0.BP): FixedPoint = {
-    apply(value, UnknownWidth(), binaryPoint)
+    apply(value, UnknownWidth, binaryPoint)
   }
 
   /** Create a FixedPoint literal with inferred width from BigInt.
     * Use PrivateObject to force users to specify width and binaryPoint by name
     */
   def fromBigInt(value: BigInt, width: Int, binaryPoint: Int): FixedPoint =
     if (width == -1) {
-      apply(value, UnknownWidth(), BinaryPoint(binaryPoint))
+      apply(value, UnknownWidth, BinaryPoint(binaryPoint))
     } else {
       apply(value, KnownWidth(width), BinaryPoint(binaryPoint))
     }
@@ -103,7 +103,7 @@ object FixedPoint extends NumObject {
   }
 
   private[fixedpoint] def recreateWidth[T <: Data](d: T): Width = {
-    d.widthOption.fold[Width](UnknownWidth())(_.W)
+    d.widthOption.fold[Width](UnknownWidth)(_.W)
   }
 
   /** Align all FixedPoints in a (possibly heterogeneous) sequence by width and binary point
@@ -145,7 +145,7 @@ object FixedPoint extends NumObject {
 
     implicit class fromDoubleToLiteral(double: Double) {
       def F(binaryPoint: BinaryPoint): FixedPoint = {
-        FixedPoint.fromDouble(double, UnknownWidth(), binaryPoint)
+        FixedPoint.fromDouble(double, UnknownWidth, binaryPoint)
       }
 
       def F(width: Width, binaryPoint: BinaryPoint): FixedPoint = {
@@ -155,7 +155,7 @@ object FixedPoint extends NumObject {
 
     implicit class fromBigDecimalToLiteral(bigDecimal: BigDecimal) {
       def F(binaryPoint: BinaryPoint): FixedPoint = {
-        FixedPoint.fromBigDecimal(bigDecimal, UnknownWidth(), binaryPoint)
+        FixedPoint.fromBigDecimal(bigDecimal, UnknownWidth, binaryPoint)
       }
 
       def F(width: Width, binaryPoint: BinaryPoint): FixedPoint = {
@@ -325,10 +325,6 @@ sealed class FixedPoint private[fixedpoint] (width: Width, private var _inferred
 
   override def bulkConnect(that: Data)(implicit sourceInfo: SourceInfo): Unit = connectOp(that, _ <> _)
 
-  override def connectFromBits(that: Bits)(implicit sourceInfo: SourceInfo): Unit = {
-    this.data := that.asTypeOf(this.data)
-  }
-
   def apply(x: BigInt): Bool = data.apply(x)
 
   def apply(x: Int): Bool = data.apply(x)

src/test/scala/FixedPointSpec.scala

@@ -76,9 +76,9 @@ class FixedPointFromBitsTester extends BasicTester {
   val f6bp0 = 6.0.F(0.BP)
   val f6bp2 = 6.0.F(2.BP)
 
-  val f1bp5shiftleft2 = Wire(FixedPoint(UnknownWidth(), BinaryPoint()))
-  val f6bp0shiftright2 = Wire(FixedPoint(UnknownWidth(), BinaryPoint()))
-  val f6bp2shiftright2 = Wire(FixedPoint(UnknownWidth(), BinaryPoint()))
+  val f1bp5shiftleft2 = Wire(FixedPoint(UnknownWidth, BinaryPoint()))
+  val f6bp0shiftright2 = Wire(FixedPoint(UnknownWidth, BinaryPoint()))
+  val f6bp2shiftright2 = Wire(FixedPoint(UnknownWidth, BinaryPoint()))
 
   f1bp5shiftleft2 := f1bp5 << 2
   f6bp0shiftright2 := f6bp0 >> 2