From 2ae50411cbc5e2cd5fdc9ca4069b9c5f64919bc4 Mon Sep 17 00:00:00 2001
From: Jim Lawson
Date: Mon, 11 May 2015 13:02:03 -0700
Subject: Incorporate chisel3-tests; update Makefile.

---
 src/test/scala/ChiselTests/VendingMachine.scala | 55 +++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/test/scala/ChiselTests/VendingMachine.scala

(limited to 'src/test/scala/ChiselTests/VendingMachine.scala')

diff --git a/src/test/scala/ChiselTests/VendingMachine.scala b/src/test/scala/ChiselTests/VendingMachine.scala
new file mode 100644
index 00000000..787f7e33
--- /dev/null
+++ b/src/test/scala/ChiselTests/VendingMachine.scala
@@ -0,0 +1,55 @@
+package ChiselTests
+import Chisel._
+
+class VendingMachine extends Module {
+  val io = new Bundle {
+    val nickel = Bool(dir = INPUT)
+    val dime   = Bool(dir = INPUT)
+    val valid  = Bool(dir = OUTPUT) }
+  val c = Lit(5, 3){ UInt() }
+  val sIdle :: s5 :: s10 :: s15 :: sOk :: Nil = Enum(UInt(), 5)
+  val state = Reg(init = sIdle)
+  when (state === sIdle) {
+    when (io.nickel) { state := s5 }
+    when (io.dime)   { state := s10 }
+  }
+  when (state === s5) {
+    when (io.nickel) { state := s10 }
+    when (io.dime)   { state := s15 }
+  }
+  when (state === s10) {
+    when (io.nickel) { state := s15 }
+    when (io.dime)   { state := sOk }
+  }
+  when (state === s15) {
+    when (io.nickel) { state := sOk }
+    when (io.dime)   { state := sOk }
+  }
+  when (state === sOk) {
+    state := sIdle
+  }
+  io.valid := (state === sOk)
+}
+
+
+class VendingMachineTester(c: VendingMachine) extends Tester(c) {
+  var money = 0
+  var isValid = false
+  for (t <- 0 until 20) {
+    val coin     = rnd.nextInt(3)*5
+    val isNickel = coin == 5
+    val isDime   = coin == 10
+
+    // Advance circuit
+    poke(c.io.nickel, int(isNickel))
+    poke(c.io.dime,   int(isDime))
+    step(1)
+
+    // Advance model
+    money = if (isValid) 0 else (money + coin)
+    isValid = money >= 20
+
+    // Compare
+    expect(c.io.valid, int(isValid))
+  }
+}
-- 
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