apollo_fpga.gateware: convert request handler to new interface

apollo_fpga/gateware/advertiser.py

@@ -71,6 +71,11 @@ def __init__(self, if_number, stop_pin):
         self.if_number = if_number
         self.stop_pin  = stop_pin
 
+    def handled(self, setup):
+        return (setup.type == USBRequestType.VENDOR) & \
+                (setup.recipient == USBRequestRecipient.INTERFACE) & \
+                (setup.index == self.if_number)
+
     def elaborate(self, platform):
         m = Module()
 
@@ -84,9 +89,7 @@ def elaborate(self, platform):
                   (setup.recipient == USBRequestRecipient.INTERFACE) & \
                   (setup.index == self.if_number)):
 
-            with m.Switch(setup.request):
-
-                with m.Case(self.REQUEST_APOLLO_ADV_STOP):
+            with m.If(setup.request == self.REQUEST_APOLLO_ADV_STOP):
 
                     # Once the receive is complete, respond with an ACK.
                     with m.If(interface.rx_ready_for_response):
@@ -97,12 +100,4 @@ def elaborate(self, platform):
                         m.d.comb += self.send_zlp()
                         m.d.usb += self.stop_pin.eq(1)
 
-                with m.Case():
-
-                    #
-                    # Stall unhandled requests.
-                    #
-                    with m.If(interface.status_requested | interface.data_requested):
-                        m.d.comb += interface.handshakes_out.stall.eq(1)
-
-                return m
+        return m