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// SPDX-License-Identifier: Apache-2.0
package chiselTests
import chisel3._
import chisel3.testers.BasicTester
import chisel3.util._
class CountTester(max: Int) extends BasicTester {
val cnt = Counter(max)
assert(cnt.n == max)
when(true.B) { cnt.inc() }
val expected = if (max == 0) 0.U else (max - 1).U
when(cnt.value === expected) {
stop()
}
}
class EnableTester(seed: Int) extends BasicTester {
val ens = RegInit(seed.asUInt)
ens := ens >> 1
val (cntEnVal, _) = Counter(ens(0), 32)
val (_, done) = Counter(true.B, 33)
when(done) {
assert(cntEnVal === popCount(seed).asUInt)
stop()
}
}
class ResetTester(n: Int) extends BasicTester {
val triggerReset = WireInit(false.B)
val wasReset = RegNext(triggerReset)
val (value, _) = Counter(0 until 8, reset = triggerReset)
triggerReset := value === (n - 1).U
when(wasReset) {
assert(value === 0.U)
stop()
}
}
class WrapTester(max: Int) extends BasicTester {
val (cnt, wrap) = Counter(true.B, max)
when(wrap) {
assert(cnt === (max - 1).asUInt)
stop()
}
}
class RangeTester(r: Range) extends BasicTester {
val (cnt, wrap) = Counter(r)
val checkWrap = RegInit(false.B)
when(checkWrap) {
assert(cnt === r.head.U)
stop()
}.elsewhen(wrap) {
assert(cnt === r.last.U)
checkWrap := true.B
}
}
class CounterSpec extends ChiselPropSpec {
property("Counter should count up") {
for (i <- 0 until 4) {
assertTesterPasses(new CountTester(i))
}
}
property("Counter can be en/disabled") {
forAll(safeUInts) { (seed: Int) => whenever(seed >= 0) { assertTesterPasses { new EnableTester(seed) } } }
}
property("Counter can be reset") {
forAll(smallPosInts) { (seed: Int) => assertTesterPasses { new ResetTester(seed) } }
}
property("Counter should wrap") {
forAll(smallPosInts) { (max: Int) => assertTesterPasses { new WrapTester(max) } }
}
property("Counter should handle a range") {
forAll(posRange) { (r: Range) =>
assertTesterPasses { new RangeTester(r) }
}
}
}
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