Added icebreaker platform. (#135)

Author: esden

migen/build/platforms/icebreaker.py

@@ -0,0 +1,57 @@
+from migen.build.generic_platform import *
+from migen.build.lattice import LatticePlatform
+from migen.build.lattice.programmer import IceStormProgrammer
+
+
+_io = [
+    ("user_ledr_n",   0, Pins("11"), IOStandard("LVCMOS33")),
+    ("user_ledg_n",   0, Pins("34"), IOStandard("LVCMOS33")),
+    ("user_button_n", 0, Pins("10"), IOStandard("LVCMOS33")),
+
+    ("serial", 0,
+        Subsignal("rx", Pins("6")),
+        Subsignal("tx", Pins("9"), Misc("PULLUP")),
+        IOStandard("LVCMOS33")
+    ),
+
+    ("spiflash", 0,
+        Subsignal("cs_n",      Pins("16"), IOStandard("LVCMOS33")),
+        Subsignal("clk",       Pins("15"), IOStandard("LVCMOS33")),
+        Subsignal("si",        Pins("17"), IOStandard("LVCMOS33")),
+        Subsignal("so",        Pins("14"), IOStandard("LVCMOS33")),
+        Subsignal("wp_n",      Pins("12"), IOStandard("LVCMOS33")),
+        Subsignal("hld_rst_n", 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")),
+    ),
+
+    ("break_off_pmod", 0,
+        Subsignal("btn", Pins("20 19 18"), IOStandard("LVCMOS33")),
+        Subsignal("ledr", Pins("26"), IOStandard("LVCMOS33")),
+        Subsignal("ledg", Pins("27 25 23 21"), IOStandard("LVCMOS33")),
+    ),
+
+    ("clk12", 0, Pins("35"), IOStandard("LVCMOS33"))
+]
+
+_connectors = [
+    ("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")
+]
+
+
+class Platform(LatticePlatform):
+    default_clk_name = "clk12"
+    default_clk_period = 83.333
+
+    def __init__(self):
+        LatticePlatform.__init__(self, "ice40-up5k-sg48", _io, _connectors,
+                                 toolchain="icestorm")
+
+    def create_programmer(self):
+        return IceStormProgrammer()