Initial commit

fpga/__init__.py

@@ -0,0 +1,17 @@
+__version__ = '0.1.0'
+
+def load_env():
+    import os, shutil
+
+
+    if shutil.which("yowasp-yosys"):
+        os.environ["NEXTPNR_ICE40"] = "yowasp-nextpnr-ice40"
+
+    if shutil.which("yowasp-nextpnr-ice40"):
+        os.environ["NEXTPNR_ICE40"] = "yowasp-nextpnr-ice40"
+
+    if shutil.which("yowasp-nextpnr-ecp5"):
+        os.environ["NEXTPNR_ECP5"]  = "yowasp-nextpnr-ecp5"
+
+load_env()
+del load_env

fpga/ice40.py

@@ -0,0 +1,31 @@
+from nmigen import *
+from nmigen.cli import main
+from nmigen_boards.icebreaker import ICEBreakerPlatform
+
+class Blinker(Elaboratable):
+    def __init__(self, maxperiod: int):
+        self.maxperiod = maxperiod
+
+    def elaborate(self, platform):
+        led = platform.request("led_r")
+
+        m = Module()
+
+        counter = Signal(range(self.maxperiod + 1))
+
+        with m.If(counter == 0):
+            m.d.sync += [
+                led.eq(~led),
+                counter.eq(self.maxperiod)
+            ]
+        with m.Else():
+            m.d.sync += counter.eq(counter - 1)
+
+        return m
+
+
+if __name__ == "__main__":
+    plat = ICEBreakerPlatform()
+    #main(plat, ports=[plat.led])
+    plat.build(Blinker(10000000), do_program=True)
+