From fbdfdff31c8859222f8facac7f193eb29065fc6a Mon Sep 17 00:00:00 2001
From: Ross Owen <ross@xmos.com>
Date: Thu, 20 Feb 2014 13:31:28 +0000
Subject: [PATCH] Added use of GET_SHARED_GLOBAL macro rather than direct
 inline ASM when getting bus-speed in interrupt handler.

---
 module_usb_audio/usb_buffer/decouple.xc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/module_usb_audio/usb_buffer/decouple.xc b/module_usb_audio/usb_buffer/decouple.xc
index bace5f67..9f0a2449 100644
--- a/module_usb_audio/usb_buffer/decouple.xc
+++ b/module_usb_audio/usb_buffer/decouple.xc
@@ -122,9 +122,10 @@ void handle_audio_request(chanend c_mix_out)
     /* Reply with underflow */
     outuint(c_mix_out, outUnderflow);
 
-    asm("ldw   %0, dp[g_curUsbSpeed]" : "=r" (usb_speed) :);
+    GET_SHARED_GLOBAL(usb_speed, g_curUsbSpeed);
 
     /* slotSize different for Audio Class 1.0/2.0. */
+    /* TODO It is quite wasteful to run this check every interrupt. Perhaps on stream start is good enough */
 #if defined(AUDIO_CLASS_FALLBACK) || defined (FULL_SPEED_AUDIO_2)
     if (usb_speed == XUD_SPEED_HS)
     {