litex/migen/flow/hooks.py

from collections import defaultdict

from migen.fhdl.structure import *
from migen.fhdl.module import Module
from migen.flow.actor import *

class EndpointSimHook(Module):
	def __init__(self, endpoint):
		self.endpoint = endpoint
	
	def on_ack(self):
		pass
	
	def on_nack(self):
		pass
	
	def on_inactive(self):
		pass
	
	def do_simulation(self, s):
		if s.rd(self.endpoint.stb):
			if s.rd(self.endpoint.ack):
				self.on_ack()
			else:
				self.on_nack()
		else:
			self.on_inactive()

class DFGHook(Module):
	def __init__(self, dfg, create):
		assert(not dfg.is_abstract())
		self.nodepair_to_ep = defaultdict(dict)
		for hookn, (u, v, data) in dfg.edges_iter(data=True):
			ep_to_hook = self.nodepair_to_ep[(u, v)]
			ep = data["source"]
			h = create(u, ep, v)
			ep_to_hook[ep] = h
			setattr(self.submodules, "hook"+str(hookn), h)
	
	def hooks_iter(self):
		for v1 in self.nodepair_to_ep.values():
			for v2 in v1.values():
				yield v2