Add support for Tang Nano.

amaranth_boards/tang_nano.py

@@ -0,0 +1,61 @@
+import subprocess
+from amaranth.vendor.gowin import GowinPlatform
+from amaranth.build import *
+from .resources import *
+
+
+class TangNanoPlatform(GowinPlatform):
+    # GW1N-LV1QN48C6/I5
+    device      = "GW1N-1"
+    series      = "GW1N"
+    size        = "1"
+    subseries   = ""
+    voltage     = "LV"
+    package     = "QN48"
+    speed       = "C6/I5"
+    default_clk = "clk24"
+    resources   = [
+        Resource("clk24", 0, Pins("35", dir="i"), Clock(24_000_000),
+                 Attrs(IO_TYPE="LVCMOS33")),
+
+        RGBLEDResource(0, r="18", g="16", b="17",
+                       attrs=Attrs(IO_TYPE="LVCMOS33")),
+
+        *ButtonResources(pins="15 14", invert=True,
+                         attrs=Attrs(IO_TYPE="LVCMOS33")),
+
+        UARTResource(0, tx="9", rx="8",
+                     attrs=Attrs(IO_TYPE="LVCMOS33", PULL_MODE="UP")),
+
+        *SPIFlashResources(0,
+            cs_n="19", clk="20", copi="22", cipo="23", wp_n="24", hold_n="25",
+            attrs=Attrs(IO_TYPE="LVCMOS33")),
+
+        Resource("lcd", 0,
+            Subsignal("clk", Pins("11", dir="o")),
+            Subsignal("hs", Pins("10", dir="o")),
+            Subsignal("vs", Pins("46", dir="o")),
+            Subsignal("de", Pins("5", dir="o")),
+            Subsignal("r", Pins("27 28 29 30 31", dir="o")),
+            Subsignal("g", Pins("32 33 34 38 39 40", dir="o")),
+            Subsignal("b", Pins("41 42 43 44 45", dir="o")),
+            Attrs(IO_TYPE="LVCMOS33")),
+
+        Resource("lcd_backlight", 0, Pins("47", dir="o"),
+                 Attrs(IO_TYPE="LVCMOS33")),
+    ]
+    connectors  = []
+
+    def toolchain_prepare(self, fragment, name, **kwargs):
+        overrides = {
+            "add_options":
+                "set_option -use_mspi_as_gpio 1 -use_sspi_as_gpio 1",
+            "gowin_pack_opts":
+                "--sspi_as_gpio --mspi_as_gpio"
+        }
+        return super().toolchain_prepare(fragment, name, **overrides, **kwargs)
+
+    def toolchain_program(self, products, name):
+        with products.extract("{}.fs".format(name)) as bitstream_filename:
+            subprocess.check_call(["openFPGALoader", "-b", "tangnano",
+                                   bitstream_filename])