timvideos#613 first cut of ice40 feather pinmaps

Signed-off-by: Tisham Dhar <[email protected]>

platforms/ice40_feather.py

@@ -0,0 +1,73 @@
+from litex.build.generic_platform import *
+from litex.build.lattice import LatticePlatform
+from litex.build.lattice.programmer import IceStormProgrammer
+
+
+_io = [
+    ("user_led_n",    0, Pins("47"), IOStandard("LVCMOS33")),
+    # RGB LED
+    ("user_ledr_n",   0, Pins("41"), IOStandard("LVCMOS33")),
+    ("user_ledg_n",   0, Pins("40"), IOStandard("LVCMOS33")),
+    ("user_ledb_n",   0, Pins("39"), IOStandard("LVCMOS33")),
+
+    ("serial", 0,
+        Subsignal("rx", Pins("23")),
+        Subsignal("tx", Pins("21"), Misc("PULLUP")),
+        IOStandard("LVCMOS33")
+    ),
+
+    ("spiflash", 0,
+        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")),
+        # TODO: Do not need these
+        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")),
+        # TODO: Find out quad-spi pins
+        Subsignal("dq",   Pins("14 17 12 13"), IOStandard("LVCMOS33")),
+    ),
+
+    ("clk12", 0, Pins("35"), IOStandard("LVCMOS33"))
+]
+
+_connectors = [
+    ("RGBLED", "6 4 3"),
+]
+
+rgb_led = [
+    ("rgbled", 0, 
+     Subsignal("rgb0", Pins("RGBLED:0")),
+     Subsignal("rgb1", Pins("RGBLED:1")),
+     Subsignal("rgb2", Pins("RGBLED:2")),
+     IOStandard("LVCMOS33")
+    ),
+]
+
+
+class Platform(LatticePlatform):
+    default_clk_name = "clk12"
+    default_clk_period = 83.333
+
+    gateware_size = 0x20000
+
+    # FIXME: Create a "spi flash module" object in the same way we have SDRAM
+    spiflash_model = "n25q128"
+    spiflash_read_dummy_bits = 8
+    spiflash_clock_div = 2
+    spiflash_total_size = int((128/8)*1024*1024) # 128Mbit
+    spiflash_page_size = 256
+    # Winbond calls 32kb/64kb sectors "blocks".
+    spiflash_sector_size = 0x10000
+
+    def __init__(self):
+        LatticePlatform.__init__(self, "ice40-up5k-sg48", _io, _connectors,
+                                 toolchain="icestorm")
+
+    def create_programmer(self):
+        return IceStormProgrammer()