Hi,

I changed the simulation API recently (unfortunately, about at the same
time as hackaday posted about Migen):
https://ssl.serverraum.org/lists-archive/devel/2014-January/003660.html

So you should write instead:
def __init__(...led...):
        self.led = led

def do_simulation(self, selfp):
        v_led = selfp.led # read the current signal value
...
cycle=selfp.simulator.cycle_counter

Haven't updated the doc/tutorial yet.

Sébastien

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