HID: add feature report to HID descriptor

  This allows to read featureReport using browser HID API

Author: pennam

UNOR4USBBridge/DAP.h

@@ -10,9 +10,38 @@ extern "C" {
 
 extern USBHID HID;
 
+#define TUD_HID_REPORT_DESC_R4_INOUT_FEATURE(report_size, ...) \
+    HID_USAGE_PAGE_N ( HID_USAGE_PAGE_VENDOR, 2   ),\
+    HID_USAGE        ( 0x01                       ),\
+    HID_COLLECTION   ( HID_COLLECTION_APPLICATION ),\
+      /* Report ID if any */\
+      __VA_ARGS__ \
+      /* Input */ \
+      HID_USAGE       ( 0x02                                   ),\
+      HID_LOGICAL_MIN ( 0x00                                   ),\
+      HID_LOGICAL_MAX_N ( 0xff, 2                              ),\
+      HID_REPORT_SIZE ( 8                                      ),\
+      HID_REPORT_COUNT( report_size                            ),\
+      HID_INPUT       ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE ),\
+      /* Output */ \
+      HID_USAGE       ( 0x03                                    ),\
+      HID_LOGICAL_MIN ( 0x00                                    ),\
+      HID_LOGICAL_MAX_N ( 0xff, 2                               ),\
+      HID_REPORT_SIZE ( 8                                       ),\
+      HID_REPORT_COUNT( report_size                             ),\
+      HID_OUTPUT      ( HID_DATA | HID_VARIABLE | HID_ABSOLUTE  ),\
+      /* Feature */ \
+      HID_USAGE       ( 0x04),\
+      HID_LOGICAL_MIN ( 0x00),\
+      HID_LOGICAL_MAX_N ( 0xff, 2),\
+      HID_REPORT_SIZE (8),\
+      HID_REPORT_COUNT(report_size),\
+      HID_FEATURE     (HID_DATA | HID_VARIABLE | HID_ABSOLUTE),\
+    HID_COLLECTION_END \
+
 static uint8_t const report_descriptor[] =
 {
-  TUD_HID_REPORT_DESC_GENERIC_INOUT(CFG_TUD_HID_EP_BUFSIZE)
+  TUD_HID_REPORT_DESC_R4_INOUT_FEATURE(CFG_TUD_HID_EP_BUFSIZE)
 };
 
 class DAPHIDDevice: public USBHIDDevice {