Add Alchitry Cu board

litex_boards/platforms/alchitry_cu.py

@@ -0,0 +1,78 @@
+#
+# This file is part of LiteX-Boards.
+#
+# Copyright (c) 2023 Nimalan M <nimalan.m@protonmail.com>
+# SPDX-License-Identifier: BSD-2-Clause
+
+# The Alchitry Cu is FPGA Development board
+# by SparkFun - https://www.sparkfun.com/products/16526.
+# 
+# It has a Lattice ICE40HX8K-CB132IC and can be programmed 
+# with the Icestorm toolchain
+# Schematic - https://cdn.sparkfun.com/assets/2/6/e/5/e/alchitry_cu_sch_update.pdf
+
+from litex.build.generic_platform import *
+from litex.build.lattice import LatticeiCE40Platform
+from litex.build.lattice.programmer import IceStormProgrammer
+
+# IOs ----------------------------------------------------------------------------------------------
+
+_io = [
+    # Clk / Rst
+    ("clk100", 0, Pins("P7"), IOStandard("LVCMOS33")),
+    ("cpu_reset", 0, Pins("P8"), IOStandard("LVCMOS33")),
+
+    # Leds
+    ("user_led", 0, Pins("J11"), IOStandard("LVCMOS33")),
+    ("user_led", 1, Pins("K11"), IOStandard("LVCMOS33")),
+    ("user_led", 2, Pins("K12"), IOStandard("LVCMOS33")),
+    ("user_led", 3, Pins("K14"), IOStandard("LVCMOS33")),
+    ("user_led", 4, Pins("L12"), IOStandard("LVCMOS33")),
+    ("user_led", 5, Pins("L14"), IOStandard("LVCMOS33")),
+    ("user_led", 6, Pins("M12"), IOStandard("LVCMOS33")),
+    ("user_led", 7, Pins("N14"), IOStandard("LVCMOS33")),
+
+    # Serial
+    ("serial", 0,
+        Subsignal("tx", Pins("P14")),
+        Subsignal("rx", Pins("M9")),
+        IOStandard("LVCMOS33")
+    ),
+
+    # Onboard QWIIC
+    ("i2c", 0,
+        Subsignal("scl", Pins("A4")),
+        Subsignal("sda", Pins("A3")),
+        IOStandard("LVCMOS33"),
+    ),
+
+    # SPIFlash X25XXSMD1
+    ("spiflash", 0,
+        Subsignal("mosi", Pins("M11")),
+        Subsignal("miso", Pins("P11")),
+        Subsignal("sck",  Pins("P12")),
+        Subsignal("ss",   Pins("P13")),
+        IOStandard("LVCMOS33")
+    ),
+]
+
+# Connectors ---------------------------------------------------------------------------------------
+
+_connectors = []
+
+# Platform -----------------------------------------------------------------------------------------
+
+class Platform(LatticeiCE40Platform):
+    default_clk_name   = "clk100"
+    default_clk_period = 1e9/100e6
+
+    def __init__(self, toolchain="icestorm", **kwargs):
+        LatticeiCE40Platform.__init__(self, "ice40-hx8k-cb132", _io, _connectors, toolchain=toolchain)
+
+    def create_programmer(self):
+        return IceStormProgrammer()
+
+    def do_finalize(self, fragment):
+        LatticeiCE40Platform.do_finalize(self, fragment)
+        self.add_period_constraint(self.lookup_request("clk100", loose=True), 1e9/100e6)
+