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// See LICENSE for license details.
package chiselTests
import org.scalatest._
import chisel3._
import chisel3.experimental.FixedPoint
import chisel3.testers.BasicTester
import chisel3.util._
import chisel3.core.DataMirror
class FromBitsBundleTester extends BasicTester {
class MultiTypeBundle extends Bundle {
val u = UInt(4.W)
val s = SInt(4.W)
val fp = FixedPoint(4.W, 3.BP)
}
val bun = new MultiTypeBundle
val bunFromBits = bun.fromBits( ((4 << 8) + (15 << 4) + (12 << 0)).U )
assert(bunFromBits.u === 4.U)
assert(bunFromBits.s === -1.S)
assert(bunFromBits.fp === FixedPoint.fromDouble(-0.5, width=4, binaryPoint=3))
stop()
}
class FromBitsVecTester extends BasicTester {
val vec = Vec(4, SInt(4.W)).fromBits( ((15 << 12) + (0 << 8) + (1 << 4) + (2 << 0)).U )
assert(vec(0) === 2.S)
assert(vec(1) === 1.S)
assert(vec(2) === 0.S)
assert(vec(3) === -1.S)
stop()
}
class FromBitsTruncationTester extends BasicTester {
val truncate = UInt(3.W).fromBits( (64 + 3).U )
val expand = UInt(3.W).fromBits( 1.U )
assert( DataMirror.widthOf(truncate).get == 3 )
assert( truncate === 3.U )
assert( DataMirror.widthOf(expand).get == 3 )
assert( expand === 1.U )
stop()
}
class FromBitsSpec extends ChiselFlatSpec {
behavior of "fromBits"
it should "work with Bundles containing Bits Types" in {
assertTesterPasses{ new FromBitsBundleTester }
}
it should "work with Vecs containing Bits Types" in {
assertTesterPasses{ new FromBitsVecTester }
}
it should "expand and truncate UInts of different width" in {
assertTesterPasses{ new FromBitsTruncationTester }
}
}
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