Implement USB HID Device Support for ESP32-S2 (#5538)

* Add support and example for USB HID Devices
* Add support and example for USB Vendor

libraries/USB/src/USBHIDSystemControl.cpp

@@ -0,0 +1,59 @@
+// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include "USBHID.h"
+
+#if CONFIG_TINYUSB_HID_ENABLED
+
+#include "USBHIDSystemControl.h"
+
+static const uint8_t report_descriptor[] = {
+    TUD_HID_REPORT_DESC_SYSTEM_CONTROL(HID_REPORT_ID(HID_REPORT_ID_SYSTEM_CONTROL))
+};
+
+USBHIDSystemControl::USBHIDSystemControl(): hid(){
+    static bool initialized = false;
+    if(!initialized){
+        initialized = true;
+        hid.addDevice(this, sizeof(report_descriptor));
+    }
+}
+
+uint16_t USBHIDSystemControl::_onGetDescriptor(uint8_t* dst){
+    memcpy(dst, report_descriptor, sizeof(report_descriptor));
+    return sizeof(report_descriptor);
+}
+
+void USBHIDSystemControl::begin(){
+    hid.begin();
+}
+
+void USBHIDSystemControl::end(){
+}
+
+bool USBHIDSystemControl::send(uint8_t value){
+    return hid.SendReport(HID_REPORT_ID_SYSTEM_CONTROL, &value, 1);
+}
+
+size_t USBHIDSystemControl::press(uint8_t k){
+    if(k > 3){
+        return 0;
+    }
+    return send(k);
+}
+
+size_t USBHIDSystemControl::release(){
+    return send(0);
+}
+
+#endif /* CONFIG_TINYUSB_HID_ENABLED */