Add configurable mouse movement and improve HID handling

hid.py

@@ -77,16 +77,8 @@ class HID:
         self._usb.active(True)
 
     def _open_interface(self, interface_descriptor):
-        # Endpoint descriptors follow the nine-byte interface descriptor.
-        offset = 9
-        while offset + 1 < len(interface_descriptor):
-            length = interface_descriptor[offset]
-            descriptor_type = interface_descriptor[offset + 1]
-            if length < 2:
-                break
-            if descriptor_type == 0x05:
-                self._usb.ep_open(interface_descriptor[offset:offset + length])
-            offset += length
+        # MicroPython opens the endpoints described by this accepted interface;
+        # USBDevice 1.29 does not expose an ep_open() method to Python.
         self._ready = True
 
     def _reset(self):
@@ -95,9 +87,18 @@ class HID:
         self._pending = []
 
     def _control_transfer(self, stage, request):
-        if (stage == 1 and request[1] == _GET_DESCRIPTOR and
+        # The report descriptor buffer is supplied at SETUP, but the same
+        # request must be accepted through its DATA and ACK stages.
+        if (request[1] == _GET_DESCRIPTOR and
                 request[3] == _DESCRIPTOR_TYPE_REPORT):
-            return REPORT_DESCRIPTOR
+            return REPORT_DESCRIPTOR if stage == 1 else True
+
+        # Desktop HID drivers commonly issue these class requests while
+        # initialising. There is no protocol/idle state to maintain here, but
+        # they must not be stalled.
+        if request[1] in (0x0A, 0x0B):  # SET_IDLE, SET_PROTOCOL
+            return True
+
         return False
 
     def _transfer_done(self, endpoint, result, transferred):
@@ -126,8 +127,8 @@ class HID:
         self._send(bytes((1, 0, 0, 0, 0, 0, 0, 0, 0)))
 
     def move(self, x, y):
-        x = max(-1, min(1, int(x)))
-        y = max(-1, min(1, int(y)))
+        x = max(-127, min(127, int(x)))
+        y = max(-127, min(127, int(y)))
         self._send(bytes((2, 0, x & 0xFF, y & 0xFF, 0)))
 
     def press_volume_up(self):