nmigen-learning/fpga/modules/blinker.dg

import "/nmigen/cli/main"
import "/nmigen_dg/*"

Blinker = subclass Elaboratable where
    __init__ = ncycles ~> None where
        @ncycles = ncycles
        @out = Signal!

    elaborate = platform ~> m where with m = Module! =>
        counter = Signal$ range (@ncycles + 1)
        Sync$ Drive counter (counter - 1)

        When (counter == 0) $ ->
            Sync$ Drive @out (~ @out)
            Sync$ Drive counter @ncycles

if __name__ == "__main__" =>
    blinker = Blinker ncycles: 10000000
    main blinker name: "blinker" ports: [blinker.out]