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// SPDX-License-Identifier: Apache-2.0
package chisel3.util
import chisel3._
object BinaryToGray {
/** Turns a binary number into gray code. */
def apply(in: UInt): UInt = in ^ (in >> 1)
}
object GrayToBinary {
/** Inverts the [[BinaryToGray]] operation. */
def apply(in: UInt, width: Int): UInt = apply(in(width - 1, 0))
/** Inverts the [[BinaryToGray]] operation. */
def apply(in: UInt): UInt = if (in.getWidth < 2) { in }
else {
val bits = in.getWidth - 2 to 0 by -1
Cat(bits.scanLeft(in.head(1)) { case (prev, ii) => prev ^ in(ii) })
}
}
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