diff --git a/lib_xua/src/core/buffer/ep/ep_buffer.xc b/lib_xua/src/core/buffer/ep/ep_buffer.xc
index e510d37a..b9c01d6b 100644
--- a/lib_xua/src/core/buffer/ep/ep_buffer.xc
+++ b/lib_xua/src/core/buffer/ep/ep_buffer.xc
@@ -880,7 +880,7 @@ void XUA_Buffer_Ep(register chanend c_aud_out,
             case XUD_SetData_Select(c_hid, ep_hid, result):
             {
                 g_hidData[0]=0;
-                UserReadHIDButtons(g_hidData);
+                UserReadHIDData(g_hidData);
                 XUD_SetReady_In(ep_hid, g_hidData, 1);
             }
             break;
diff --git a/lib_xua/src/core/user/user_hid.h b/lib_xua/src/core/user/user_hid.h
index b2530d0f..6620c7dd 100644
--- a/lib_xua/src/core/user/user_hid.h
+++ b/lib_xua/src/core/user/user_hid.h
@@ -9,5 +9,7 @@
 #define HID_CONTROL_VOLDN_SHIFT		   0x04
 #define HID_CONTROL_MUTE_SHIFT		   0x05
 
-void UserReadHIDButtons(unsigned char hidData[]);
+#define HID_DATA_SIZE 1
+
+void UserReadHIDData(unsigned char hidData[HID_DATA_SIZE]);
 
diff --git a/lib_xua/src/core/user/user_hid.xc b/lib_xua/src/core/user/user_hid.xc
new file mode 100644
index 00000000..61466360
--- /dev/null
+++ b/lib_xua/src/core/user/user_hid.xc
@@ -0,0 +1,12 @@
+// Copyright (c) 2019, XMOS Ltd, All rights reserved
+#include <stdint.h>
+#include <limits.h>
+#include <xs1.h>
+#include "user_hid.h"
+
+void UserReadHIDData( unsigned char hidData[ HID_DATA_SIZE ])
+{
+  for( unsigned idx = 0; idx < HID_DATA_SIZE; ++idx ) {
+    hidData[ idx ] = 1;
+  }
+}
\ No newline at end of file