From bd71651cc4919454d9d40122688843b6d1268b92 Mon Sep 17 00:00:00 2001
From: Ed <ed@xmos.com>
Date: Wed, 11 Mar 2020 16:01:42 +0000
Subject: [PATCH] Allow access of mclk setting externally for hardware test
 harness

---
 lib_xua/src/core/buffer/ep/ep_buffer.xc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib_xua/src/core/buffer/ep/ep_buffer.xc b/lib_xua/src/core/buffer/ep/ep_buffer.xc
index ae58ef83..2093502f 100644
--- a/lib_xua/src/core/buffer/ep/ep_buffer.xc
+++ b/lib_xua/src/core/buffer/ep/ep_buffer.xc
@@ -182,6 +182,8 @@ void XUA_Buffer(
     }
 }
 
+// Allows us to externally modify masterClockFreq
+unsafe{volatile unsigned * unsafe masterClockFreq_ptr;}
 
 /**
  * Buffers data from audio endpoints
@@ -268,6 +270,8 @@ void XUA_Buffer_Ep(register chanend c_aud_out,
     unsigned masterClockFreq = DEFAULT_MCLK_FREQ;
     unsigned lastClock = 0;
 
+    unsafe{masterClockFreq_ptr = &masterClockFreq;}
+
     unsigned clocks = 0;
     long long clockcounter = 0;