diff --git a/micropython/usb/usb-device-hid/usb/device/hid.py b/micropython/usb/usb-device-hid/usb/device/hid.py
index 9e4c70dde..ce7dcc7bc 100644
--- a/micropython/usb/usb-device-hid/usb/device/hid.py
+++ b/micropython/usb/usb-device-hid/usb/device/hid.py
@@ -34,6 +34,8 @@
_INTERFACE_SUBCLASS_NONE = const(0x00)
_INTERFACE_SUBCLASS_BOOT = const(0x01)
+# These values will only make sense when interface subclass
+# is 0x01, which indicates boot protocol support.
_INTERFACE_PROTOCOL_NONE = const(0x00)
_INTERFACE_PROTOCOL_KEYBOARD = const(0x01)
_INTERFACE_PROTOCOL_MOUSE = const(0x02)
@@ -130,7 +132,9 @@ def desc_cfg(self, desc, itf_num, ep_num, strs):
itf_num,
1,
_INTERFACE_CLASS,
- _INTERFACE_SUBCLASS_NONE,
+ _INTERFACE_SUBCLASS_NONE
+ if self.protocol == _INTERFACE_PROTOCOL_NONE
+ else _INTERFACE_SUBCLASS_BOOT,
self.protocol,
len(strs) if self.interface_str else 0,
)
@@ -148,7 +152,12 @@ def desc_cfg(self, desc, itf_num, ep_num, strs):
desc.endpoint(self._int_ep, "interrupt", 8, 8)
self.idle_rate = 0
- self.protocol = 0
+
+ # This variable is reused to track boot protocol status.
+ # 0 for boot protocol, 1 for report protocol
+ # According to Device Class Definition for Human Interface Devices (HID) v1.11
+ # Appendix F.5, the device comes up in non-boot mode by default.
+ self.protocol = 1
def num_eps(self):
return 1
@@ -197,6 +206,8 @@ def on_interface_control_xfer(self, stage, request):
if desc_type == _DESC_HID_TYPE:
return self.get_hid_descriptor()
if desc_type == _DESC_REPORT_TYPE:
+ # Reset to report protocol when report descriptor is requested
+ self.protocol = 1
return self.report_descriptor
elif req_type == _REQ_TYPE_CLASS:
# HID Spec p50: 7.2 Class-Specific Requests
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