From: whitequark Date: Wed, 9 Oct 2019 23:19:19 +0000 (+0000) Subject: examples: update blinky, add some explanatory text about domains. X-Git-Tag: v0.1rc1~34 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7dfd7fb12a722398358869ebe5fdbd6788c1c0c6;p=nmigen.git examples: update blinky, add some explanatory text about domains. --- diff --git a/examples/board/01_blinky.py b/examples/board/01_blinky.py new file mode 100644 index 0000000..0a21a00 --- /dev/null +++ b/examples/board/01_blinky.py @@ -0,0 +1,21 @@ +# If the design does not create a "sync" clock domain, it is created by the nMigen build system +# using the platform default clock (and default reset, if any). + +from nmigen import * +from nmigen_boards.ice40_hx1k_blink_evn import * + + +class Blinky(Elaboratable): + def elaborate(self, platform): + led = platform.request("led", 0) + timer = Signal(20) + + m = Module() + m.d.sync += timer.eq(timer + 1) + m.d.comb += led.o.eq(timer[-1]) + return m + + +if __name__ == "__main__": + platform = ICE40HX1KBlinkEVNPlatform() + platform.build(Blinky(), do_program=True) diff --git a/examples/board/02_domain.py b/examples/board/02_domain.py new file mode 100644 index 0000000..d359334 --- /dev/null +++ b/examples/board/02_domain.py @@ -0,0 +1,25 @@ +# If more control over clocking and resets is required, a "sync" clock domain could be created +# explicitly, which overrides the default behavior. Any other clock domains could also be +# independently created in addition to the main "sync" domain. + +from nmigen import * +from nmigen_boards.ice40_hx1k_blink_evn import * + + +class BlinkyWithDomain(Elaboratable): + def elaborate(self, platform): + clk3p3 = platform.request("clk3p3") + led = platform.request("led", 0) + timer = Signal(20) + + m = Module() + m.domains.sync = ClockDomain() + m.d.comb += ClockSignal().eq(clk3p3.i) + m.d.sync += timer.eq(timer + 1) + m.d.comb += led.o.eq(timer[-1]) + return m + + +if __name__ == "__main__": + platform = ICE40HX1KBlinkEVNPlatform() + platform.build(BlinkyWithDomain(), do_program=True) diff --git a/examples/board/blinky.py b/examples/board/blinky.py deleted file mode 100644 index 53f49d0..0000000 --- a/examples/board/blinky.py +++ /dev/null @@ -1,21 +0,0 @@ -from nmigen import * -from nmigen_boards.ice40_hx1k_blink_evn import * - - -class Blinky(Elaboratable): - def elaborate(self, platform): - clk3p3 = platform.request("clk3p3") - user_led = platform.request("user_led", 0) - counter = Signal(20) - - m = Module() - m.domains.sync = ClockDomain() - m.d.comb += ClockSignal().eq(clk3p3.i) - m.d.sync += counter.eq(counter + 1) - m.d.comb += user_led.o.eq(counter[-1]) - return m - - -if __name__ == "__main__": - platform = ICE40HX1KBlinkEVNPlatform() - platform.build(Blinky(), do_program=True)