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#!/usr/bin/env python3
from migen import *
from litex.build.generic_platform import *
from litex.build.gowin.platform import GowinPlatform
from litex.build.openfpgaloader import OpenFPGALoader
# IOs ----------------------------------------------------------------------------------------------
_io = [
("user_led", 0, Pins("86"), IOStandard("LVCMOS33")),
("clk12", 0, Pins("35"), IOStandard("LVCMOS33")),
("rst", 0, Pins("77"), IOStandard("LVCMOS33")),
("user_led", 0, Pins("86"), IOStandard("LVCMOS33")),
("user_led", 1, Pins("85"), IOStandard("LVCMOS33")),
("user_led", 2, Pins("84"), IOStandard("LVCMOS33")),
("user_led", 3, Pins("83"), IOStandard("LVCMOS33")),
("user_led", 4, Pins("82"), IOStandard("LVCMOS33")),
("user_led", 5, Pins("81"), IOStandard("LVCMOS33")),
("user_led", 6, Pins("80"), IOStandard("LVCMOS33")),
("user_led", 7, Pins("79"), IOStandard("LVCMOS33")),
("serial", 0,
Subsignal("tx", Pins("15"), IOStandard("LVCMOS33")),
Subsignal("rx", Pins("16"), IOStandard("LVCMOS33"))
),
("spiflash", 0,
Subsignal("cs_n", Pins("51"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("49"), IOStandard("LVCMOS33")),
Subsignal("miso", Pins("53"), IOStandard("LVCMOS33")),
Subsignal("mosi", Pins("48"), IOStandard("LVCMOS33")),
Subsignal("wp", Pins("54"), IOStandard("LVCMOS33")),
Subsignal("hold", Pins("50"), IOStandard("LVCMOS33")),
),
# this one is the FTDI chip
("spiflash", 1,
Subsignal("cs_n", Pins("13"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("16"), IOStandard("LVCMOS33")),
Subsignal("miso", Pins("14"), IOStandard("LVCMOS33")),
Subsignal("mosi", Pins("15"), IOStandard("LVCMOS33")),
),
]
# Connectors ---------------------------------------------------------------------------------------
_connectors = [
("PMOD", "47 41 38 40 - - 36 42 39 37"),
]
# Platform -----------------------------------------------------------------------------------------
class Platform(GowinPlatform):
default_clk_name = "clk12"
default_clk_period = 1e9/12e6
def __init__(self):
GowinPlatform.__init__(self, "GW1NR-LV9QN88C6/I5", _io, toolchain="gowin", devicename='GW1NR-9')
def create_programmer(self):
return OpenFPGALoader("littlebee")