Add another HID interface using the consumer HID class for media keys. Resolves #32.

right/src/usb_interfaces/usb_interface_media_keyboard.h

@@ -0,0 +1,43 @@
+#ifndef __USB_INTERFACE_MEDIA_KEYBOARD_H__
+#define __USB_INTERFACE_MEDIA_KEYBOARD_H__
+
+// Includes:
+
+    #include "fsl_common.h"
+    #include "usb_api.h"
+    #include "usb_descriptors/usb_descriptor_media_keyboard_report.h"
+
+// Macros:
+
+    #define USB_MEDIA_KEYBOARD_INTERFACE_INDEX 3
+
+    #define USB_MEDIA_KEYBOARD_ENDPOINT_INDEX 5
+    #define USB_MEDIA_KEYBOARD_ENDPOINT_COUNT 1
+
+    #define USB_MEDIA_KEYBOARD_INTERRUPT_IN_PACKET_SIZE 8
+    #define USB_MEDIA_KEYBOARD_INTERRUPT_IN_INTERVAL 4
+
+    #define USB_MEDIA_KEYBOARD_REPORT_LENGTH 8
+
+// Typedefs:
+
+    typedef struct {
+        uint16_t scancodes[USB_MEDIA_KEYBOARD_MAX_KEYS];
+    } __attribute__ ((packed)) usb_media_keyboard_report_t;
+
+// Variables:
+
+    extern bool IsUsbMediaKeyboardReportSent;
+    extern usb_device_class_struct_t UsbMediaKeyboardClass;
+    extern usb_media_keyboard_report_t* ActiveUsbMediaKeyboardReport;
+
+// Functions:
+
+    extern usb_status_t UsbMediaKeyboardCallback(class_handle_t handle, uint32_t event, void *param);
+    extern usb_status_t UsbMediaKeyboardSetConfiguration(class_handle_t handle, uint8_t configuration);
+    extern usb_status_t UsbMediaKeyboardSetInterface(class_handle_t handle, uint8_t interface, uint8_t alternateSetting);
+
+    extern void ResetActiveUsbMediaKeyboardReport();
+    extern void SwitchActiveUsbMediaKeyboardReport();
+
+#endif