litex-boards/litex_boards/platforms/icebreaker.py

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#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Piotr Esden-Tempski <piotr@esden.net>
# SPDX-License-Identifier: BSD-2-Clause
# iCEBreaker FPGA:
# - Crowd Supply campaign: https://www.crowdsupply.com/1bitsquared/icebreaker
# - 1BitSquared Store: https://1bitsquared.com/products/icebreaker
# - Design files: https://github.com/icebreaker/icebreaker
from litex.build.generic_platform import *
from litex.build.lattice import LatticePlatform
from litex.build.lattice.programmer import IceStormProgrammer
# IOs ----------------------------------------------------------------------------------------------
_io = [
# Clk / Rst
("clk12", 0, Pins("35"), IOStandard("LVCMOS33")),
# Leds
("user_led_n", 0, Pins("11"), IOStandard("LVCMOS33")),
("user_led_n", 1, Pins("37"), IOStandard("LVCMOS33")),
("user_ledr_n", 0, Pins("11"), IOStandard("LVCMOS33")), # Color-specific alias
("user_ledg_n", 0, Pins("37"), IOStandard("LVCMOS33")), # Color-specific alias
# Button
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("user_btn_n", 0, Pins("10"), IOStandard("LVCMOS33")),
# Serial
("serial", 0,
Subsignal("rx", Pins("6")),
Subsignal("tx", Pins("9"), Misc("PULLUP")),
IOStandard("LVCMOS33")
),
# SPIFlash
("spiflash", 0,
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Subsignal("cs_n", Pins("16"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("15"), IOStandard("LVCMOS33")),
Subsignal("miso", Pins("17"), IOStandard("LVCMOS33")),
Subsignal("mosi", Pins("14"), IOStandard("LVCMOS33")),
Subsignal("wp", Pins("12"), IOStandard("LVCMOS33")),
Subsignal("hold", Pins("13"), IOStandard("LVCMOS33")),
),
("spiflash4x", 0,
Subsignal("cs_n", Pins("16"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("15"), IOStandard("LVCMOS33")),
Subsignal("dq", Pins("14 17 12 13"), IOStandard("LVCMOS33")),
),
]
# Connectors ---------------------------------------------------------------------------------------
_connectors = [
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("PMOD1A", "4 2 47 45 3 48 46 44"),
("PMOD1B", "43 38 34 31 42 36 32 28"),
("PMOD2", "27 25 21 19 26 23 20 18")
]
# The attached LED/button section can be either used standalone or as a PMOD.
# Attach to platform using:
# plat.add_extension(break_off_pmod)
# pmod_btn = plat.request("user_btn")
break_off_pmod = [
("user_btn", 0, Pins("PMOD2:6"), IOStandard("LVCMOS33")),
("user_btn", 1, Pins("PMOD2:3"), IOStandard("LVCMOS33")),
("user_btn", 2, Pins("PMOD2:7"), IOStandard("LVCMOS33")),
("user_led", 0, Pins("PMOD2:4"), IOStandard("LVCMOS33")),
("user_led", 1, Pins("PMOD2:0"), IOStandard("LVCMOS33")),
("user_led", 2, Pins("PMOD2:1"), IOStandard("LVCMOS33")),
("user_led", 3, Pins("PMOD2:5"), IOStandard("LVCMOS33")),
("user_led", 4, Pins("PMOD2:2"), IOStandard("LVCMOS33")),
# Color-specific aliases
("user_ledr", 0, Pins("PMOD2:4"), IOStandard("LVCMOS33")),
("user_ledg", 0, Pins("PMOD2:0"), IOStandard("LVCMOS33")),
("user_ledg", 1, Pins("PMOD2:1"), IOStandard("LVCMOS33")),
("user_ledg", 2, Pins("PMOD2:5"), IOStandard("LVCMOS33")),
("user_ledg", 3, Pins("PMOD2:2"), IOStandard("LVCMOS33"))
]
# Platform -----------------------------------------------------------------------------------------
class Platform(LatticePlatform):
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default_clk_name = "clk12"
default_clk_period = 1e9/12e6
def __init__(self):
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LatticePlatform.__init__(self, "ice40-up5k-sg48", _io, _connectors, toolchain="icestorm")
def create_programmer(self):
return IceStormProgrammer()
def do_finalize(self, fragment):
LatticePlatform.do_finalize(self, fragment)
self.add_period_constraint(self.lookup_request("clk12", loose=True), 1e9/12e6)