blinky.py

from nmigen import *
from nmigen.cli import main
 
 
class Blinky(Elaboratable):
    def __init__(self):
        self.led = Signal()
 
    def elaborate(self, platform):
        m = Module()
        counter = Signal(3)
        m.d.sync += counter.eq(counter + 1)
        m.d.comb += self.led.eq(counter[0])
        return m
 
if __name__ == "__main__":
    top = Blinky()
    main(top, ports=(top.led))

This piece of code should generate verilog code when called with

python blinky.py generate

(with our N00b background) but it generates the error message

TypeError: Only signals may be added as ports, not (slice (sig led) 0:1)

I guess we're doing something wrong on a very basic level ... but I have no idea what.