#ifndef USB_EXTRA_H
#define USB_EXTRA_H 1
+/*
+ * Enhanced keyboard features for Windows:
+ * Audio control and System control
+ *
+ * http://www.microsoft.com/whdc/archive/w2kbd.mspx
+ */
#include <stdint.h>
#include "usb.h"
#define EXTRA_SIZE 2
#define EXTRA_BUFFER EP_DOUBLE_BUFFER
-// http://www.microsoft.com/whdc/archive/w2kbd.mspx
+
+// Consumer Page(0x0C) Consumer Control(0x01)
#define AUDIO_VOL_UP (1<<0)
#define AUDIO_VOL_DOWN (1<<1)
#define AUDIO_MUTE (1<<2)
+// Generic Desktop Page(0x01) System Control(0x80)
#define SYSTEM_POWER_DOWN (1<<0)
#define SYSTEM_SLEEP (1<<1)
#define SYSTEM_WAKE_UP (1<<2)