more work on fetcher

src/groovylight/fetcher.py

@@ -22,6 +22,31 @@ logger = logging.getLogger(__name__)
 CoordLayout = data.StructLayout({"x": unsigned(32), "y": unsigned(32)})
 
 
+class AddressConverter(wiring.Component):
+    """Translates display (x,y) into full screen (x,y) based on geometry"""
+
+    def __init__(self, geom: DisplayString, *, src_loc_at=0):
+        self.geom = geom
+        super().__init__(
+            {
+                "input_x": In(geom.dimensions.length),
+                "addr": In(unsigned(geom.dimensions.addr_bits)),
+                "output": Out(CoordLayout).array(geom.dimensions.mux),
+            },
+            src_loc_at=src_loc_at,
+        )
+
+    def elaborate(self, platform: Platform) -> Module:
+        m = Module()
+
+        for mux in range(self.geom.dimensions.mux):
+            m.d.comb += self.output[mux].eq(
+                self.geom.translate_coord(self.input_x, self.addr, mux)
+            )
+
+        return m
+
+
 class AddressGenerator(wiring.Component):
     """Generates (x,y) sequences corresponding to a display row."""
 
@@ -29,7 +54,8 @@ class AddressGenerator(wiring.Component):
         self.geom = geom
         super().__init__(
             {
-                "coordstream": Out(stream.Signature(CoordLayout)),
+                "coordstream": Out( stream.Signature(CoordLayout.array(geom.dimensions.mux))
+                ),
                 "start": In(1),
                 "done": Out(1),
                 "addr": In(geom.dimensions.addr_bits),
@@ -43,21 +69,20 @@ class AddressGenerator(wiring.Component):
         counter = Signal(self.geom.dimensions.length)
 
         # based on the geometry we generate x,y pairs.
+        m.submodules.translate = translate = AddressConverter(self.geom)
 
         with m.FSM():
             with m.State("init"):
                 m.d.comb += self.done.eq(0)
                 m.d.sync += counter.eq(0)
+                m.d.comb += self.coordstream.valid.eq(0)
                 with m.If(self.start):
                     m.next = "run"
 
             with m.State("run"):
-                if self.geom.rotation == DisplayRotation.LEFTRIGHT:
-                    # default case, +x.
-                    pass
-                elif self.geom.rotation == DisplayRotation.UPDOWN:
-                    # r 90, +y
-                    pass
+                # stream data out as long as it's valid.
+
+                pass
             with m.State("done"):
                 m.d.comb += self.done.eq(1)
                 m.next = "init"