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// See LICENSE for license details.
package chiselTests
import Chisel._
import org.scalatest._
import org.scalatest.prop._
import Chisel.testers.BasicTester
class CountTester(max: Int) extends BasicTester {
val cnt = Counter(max)
when(Bool(true)) { cnt.inc() }
when(cnt.value === UInt(max-1)) { io.done := Bool(true) }
}
class EnableTester(seed: Int) extends BasicTester {
val ens = Reg(init = UInt(seed))
ens := ens >> 1
val (cntEn, cntWrap) = Counter(ens(0), 32)
val cnt = Counter(Bool(true), 32)._1
when(cnt === UInt(31)) {
io.done := Bool(true)
io.error := cnt != UInt(popCount(seed))
}
}
class WrapTester(max: Int) extends BasicTester {
val (cnt, wrap) = Counter(Bool(true), max)
when(wrap) { io.done := Bool(true); io.error := cnt != UInt(max) }
}
class CounterSpec extends ChiselPropSpec {
property("Counter should count up") {
forAll(smallPosInts) { (max: Int) => assert(execute{ new CountTester(max) }) }
}
property("Counter can be en/disabled") {
forAll(safeUInts) { (seed: Int) => assert(execute{ new EnableTester(seed) }) }
}
property("Counter should wrap") {
forAll(smallPosInts) { (max: Int) => assert(execute{ new WrapTester(max) }) }
}
}
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