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import itertools
from nmigen import *
from nmigen.build import ResourceError
class Blinky(Elaboratable):
def elaborate(self, platform):
m = Module()
leds = []
for n in itertools.count():
try:
leds.append(platform.request("user_led", n))
except ResourceError:
break
leds = Cat(led.o for led in leds)
clk_freq = platform.default_clk_frequency
ctr = Signal(max=int(clk_freq//2), reset=int(clk_freq//2) - 1)
with m.If(ctr == 0):
m.d.sync += ctr.eq(ctr.reset)
m.d.sync += leds.eq(~leds)
with m.Else():
m.d.sync += ctr.eq(ctr - 1)
return m
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