Added first test for nonlocal

--HG--
branch : 0.8-dev

myhdl/test/conversion/general/test_nonlocal.py

@@ -0,0 +1,63 @@
+import os
+path = os.path
+
+from myhdl import *
+
+
+def NonlocalBench():
+
+    ALL_ONES = 2**7-1
+    ONE = 1
+
+    qout = Signal(intbv(ONE)[8:])
+    init = Signal(bool(0))
+    clk = Signal(bool(0))
+    reset = ResetSignal(0, active=1, async=True)
+
+    q = intbv(ONE)[8:]
+
+    @always_seq(clk.posedge, reset=reset)
+    def scrambler():
+        if init:
+            q[8:1] = ALL_ONES 
+        else:
+            q[0] = q[7] ^ q[6]
+            q[8:1] = q[7:0] 
+        qout.next = q[8:1]
+
+    @instance
+    def clkgen():
+        clk.next = 1
+        while True:
+            yield delay(10)
+            clk.next = not clk
+
+    @instance
+    def stimulus():
+        reset.next = 0
+        init.next = 0
+        yield clk.negedge
+        reset.next = 1
+        yield clk.negedge
+        print qout
+        assert qout == ONE
+        reset.next = 0
+        for i in range(100):
+            yield clk.negedge
+            print qout
+        init.next = 1
+        yield clk.negedge
+        assert qout == ALL_ONES
+        print qout
+        init.next = 0
+        for i in range(300):
+            print qout
+        raise StopSimulation()
+        
+    return scrambler, clkgen, stimulus
+
+
+
+def test_nonlocal():
+    assert conversion.verify(NonlocalBench) == 0
+