Hi,
Attached is a build script that does two things:
1) instantiates the new DDC/EDID core from milkymist-ng
2) blinks a LED using the DVI/HDMI pixel clock - basically this makes a
xrandr-controlled LED blinker :)
It is useful for tracking down EDID problems on the video mixer (faster
to synthesize than the whole SoC) and as an example of using Mibuild.
Sebastien
from migen.fhdl.structure import *
from migen.fhdl.module import Module
from mibuild.platforms import m1
from mibuild.crg import CRG
from milkymist.dvisampler.edid import EDID
class EDIDTester(EDID, CRG):
def __init__(self):
EDID.__init__(self)
self.clk = Signal()
self.data0_n = Signal()
self.data1 = Signal()
self.data2_n = Signal()
self.clk50 = Signal()
self.rst = Signal()
self.led = Signal()
self.cd_sys = ClockDomain("sys")
self.cd_pix = ClockDomain("pix")
self.comb += [
self.cd_sys.clk.eq(self.clk50),
self.cd_sys.rst.eq(self.rst),
self.cd_pix.clk.eq(self.clk)
]
counter = Signal(23)
self.comb += self.led.eq(counter[22])
self.sync.pix += counter.eq(counter + 1)
dut = EDIDTester()
plat = m1.Platform()
plat.request("clk50", 0, dut.clk50)
plat.request("user_btn", 0, dut.rst)
plat.request("dvi_in", 0, dut)
plat.request("user_led", 0, dut.led)
plat.add_platform_command("NET \"{clk}\" CLOCK_DEDICATED_ROUTE = FALSE;", clk=dut.clk)
plat.build_cmdline(dut, clock_domains=dut.get_clock_domains())
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