diff --git a/cores/arduino/USB/PluggableUSBDevice.cpp b/cores/arduino/USB/PluggableUSBDevice.cpp
index 288f940c6..c1449610d 100644
--- a/cores/arduino/USB/PluggableUSBDevice.cpp
+++ b/cores/arduino/USB/PluggableUSBDevice.cpp
@@ -60,6 +60,10 @@ uint32_t arduino::internal::PluggableUSBModule::write_finish(usb_ep_t endpoint)
return PluggableUSBD().write_finish(endpoint);
}
+void arduino::internal::PluggableUSBModule::callback_reset()
+{
+}
+
arduino::PluggableUSBDevice::PluggableUSBDevice(uint16_t vendor_id, uint16_t product_id)
: USBDevice(get_usb_phy(), vendor_id, product_id, 1 << 8)
{
diff --git a/cores/arduino/USB/PluggableUSBDevice.h b/cores/arduino/USB/PluggableUSBDevice.h
index a92bb9693..d766bd80b 100644
--- a/cores/arduino/USB/PluggableUSBDevice.h
+++ b/cores/arduino/USB/PluggableUSBDevice.h
@@ -38,6 +38,8 @@ class PluggableUSBModule {
PluggableUSBModule(uint8_t numIfs) :
numInterfaces(numIfs)
{ }
+ virtual ~PluggableUSBModule()
+ { }
void lock();
void unlock();
void assert_locked();
@@ -49,17 +51,25 @@ class PluggableUSBModule {
uint32_t write_finish(usb_ep_t endpoint);
protected:
- virtual const uint8_t *configuration_desc(uint8_t index);
- virtual void callback_reset() {};
- virtual void callback_state_change(USBDevice::DeviceState new_state);
- virtual uint32_t callback_request(const USBDevice::setup_packet_t *setup, USBDevice::RequestResult *result, uint8_t** data);
- virtual bool callback_request_xfer_done(const USBDevice::setup_packet_t *setup, bool aborted);
- virtual bool callback_set_configuration(uint8_t configuration);
- virtual void callback_set_interface(uint16_t interface, uint8_t alternate);
- virtual void init(EndpointResolver& resolver);
- virtual const uint8_t *string_iinterface_desc();
+ virtual const uint8_t *configuration_desc(uint8_t index) = 0;
+ virtual void callback_state_change(USBDevice::DeviceState new_state) = 0;
+ virtual uint32_t callback_request(const USBDevice::setup_packet_t *setup, USBDevice::RequestResult *result, uint8_t** data) = 0;
+ virtual bool callback_request_xfer_done(const USBDevice::setup_packet_t *setup, bool aborted) = 0;
+ virtual bool callback_set_configuration(uint8_t configuration) = 0;
+ virtual void callback_set_interface(uint16_t interface, uint8_t alternate) = 0;
+ virtual void init(EndpointResolver& resolver) = 0;
+ virtual const uint8_t *string_iinterface_desc() = 0;
virtual uint8_t getProductVersion() = 0;
+ /**
+ * Non-pure virtual method with a non-inline definition
+ *
+ * @note This satisfies all criteria necessary for the compiler to emit a
+ * vtable, allowing users to safely subclass any of the derived "pluggable"
+ * USB device classes (USBCDC, USBHID, USBMIDI, etc).
+ */
+ virtual void callback_reset();
+
uint8_t pluggedInterface;
const uint8_t numInterfaces;
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