From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Wed, 20 Jun 2012 16:25:01 +0000 (+0200)
Subject: examples/dataflow: structuring test
X-Git-Tag: 24jan2021_ls180~2099^2~902
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6fac3f027fc9c5bd779ee47e566b8065f8659356;p=litex.git

examples/dataflow: structuring test
---

diff --git a/examples/dataflow/structuring.py b/examples/dataflow/structuring.py
new file mode 100644
index 00000000..3963777e
--- /dev/null
+++ b/examples/dataflow/structuring.py
@@ -0,0 +1,38 @@
+from migen.flow.network import *
+from migen.actorlib import structuring
+from migen.actorlib.sim import *
+from migen.sim.generic import Simulator
+from migen.sim.icarus import Runner
+
+pack_factor = 5
+
+def source_gen():
+	for i in range(80):
+		#print("==> " + str(i))
+		yield Token("source", {"value": i})
+
+def sink_gen():
+	while True:
+		t = Token("sink")
+		yield t
+		print(t.value["value"])
+
+def main():
+	base_layout = [("value", BV(32))]
+	
+	source = ActorNode(SimActor(source_gen(), ("source", Source, base_layout)))
+	packer = ActorNode(structuring.Pack(base_layout, pack_factor))
+	unpacker = ActorNode(structuring.Unpack(pack_factor, base_layout))
+	sink = ActorNode(SimActor(sink_gen(), ("sink", Sink, base_layout)))
+	
+	g = DataFlowGraph()
+	g.add_connection(source, packer)
+	g.add_connection(packer, unpacker)
+	g.add_connection(unpacker, sink)
+	comp = CompositeActor(g)
+	
+	fragment = comp.get_fragment()
+	sim = Simulator(fragment, Runner())
+	sim.run(100)
+
+main()
diff --git a/migen/actorlib/structuring.py b/migen/actorlib/structuring.py
index dff40278..1f8687e6 100644
--- a/migen/actorlib/structuring.py
+++ b/migen/actorlib/structuring.py
@@ -16,13 +16,14 @@ class Cast(CombinatorialActor):
 			Cat(*sigs_to).eq(Cat(*sigs_from))
 		])
 
-class Chop(Actor):
+def pack_layout(l, n):
+	return [("chunk{0}".format(i), l) for i in range(n)]
+
+class Unpack(Actor):
 	def __init__(self, n, layout_to):
 		self.n = n
-		layout_from = [("chunk{0}".format(i), layout_to)
-			for i in range(self.n)]
 		super().__init__(
-			("sink", Sink, layout_from),
+			("sink", Sink, pack_layout(layout_to, n)),
 			("source", Source, layout_to))
 	
 	def get_fragment(self):
@@ -43,21 +44,18 @@ class Chop(Actor):
 				)
 			)
 		]
-		cases = [(Constant(i, BV(muxbits)),
+		cases = [(Constant(i, BV(muxbits)) if i else Default(),
 			Cat(*self.token("source").flatten()).eq(*self.token("sink").subrecord("chunk{0}".format(i)).flatten()))
 			for i in range(self.n)]
-		cases[-1][0] = Default()
 		comb.append(Case(mux, *cases))
 		return Fragment(comb, sync)
 
 class Pack(Actor):
 	def __init__(self, layout_from, n):
 		self.n = n
-		layout_to = [("chunk{0}".format(i), layout_from)
-			for i in range(self.n)]
 		super().__init__(
 			("sink", Sink, layout_from),
-			("source", Source, layout_to))
+			("source", Source, pack_layout(layout_from, n)))
 	
 	def get_fragment(self):
 		demuxbits = bits_for(self.n-1)
@@ -66,7 +64,7 @@ class Pack(Actor):
 		load_part = Signal()
 		strobe_all = Signal()
 		cases = [(Constant(i, BV(demuxbits)),
-			Cat(*self.token("source").subrecord("chunk{0}".format(i)).flatten()).eq(*self.token("sink").flatten())
+			Cat(*self.token("source").subrecord("chunk{0}".format(i)).flatten()).eq(*self.token("sink").flatten()))
 			for i in range(self.n)]
 		comb = [
 			self.endpoints["sink"].ack.eq(~strobe_all | self.endpoints["source"].ack),