diff --git a/module_usb_aud_shared/i2c/i2c.h b/module_usb_aud_shared/i2c/i2c.h
deleted file mode 100644
index 7bce33f0..00000000
--- a/module_usb_aud_shared/i2c/i2c.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/**
- * Module:  module_usb_aud_shared
- * Version: 2v3_iosrc0
- * Build:   5247dfd8ec69594e0670e3b8073efd3c453ad07d
- * File:    i2c.h
- *
- * The copyrights, all other intellectual and industrial 
- * property rights are retained by XMOS and/or its licensors. 
- * Terms and conditions covering the use of this code can
- * be found in the Xmos End User License Agreement.
- *
- * Copyright XMOS Ltd 2010
- *
- * In the case where this code is a modification of existing code
- * under a separate license, the separate license terms are shown
- * below. The modifications to the code are still covered by the 
- * copyright notice above.
- *
- **/                                   
-
-// Channel interface
-void I2cRegWriteC(int deviceAdrs, int Adrs, int WrData,  chanend c);
-
-int I2cRegReadC(int deviceAdrs, int Adrs, chanend c);
-
-// Function interface
-void I2cRegWrite(int deviceAdrs, int Adrs, int WrData,  port AUD_SCLK, port AUD_SDIN);
-
-int I2cRegRead(int deviceAdrs, int Adrs, port AUD_SCLK, port AUD_SDIN);
diff --git a/module_usb_aud_shared/i2c/i2c.xc b/module_usb_aud_shared/i2c/i2c.xc
deleted file mode 100755
index ba56c22a..00000000
--- a/module_usb_aud_shared/i2c/i2c.xc
+++ /dev/null
@@ -1,362 +0,0 @@
-/**
- * Module:  module_usb_aud_shared
- * Version: 2v3_iosrc0
- * Build:   c1785ffa61c5d34613093518d78adcebd79ae1cc
- * File:    i2c.xc
- *
- * The copyrights, all other intellectual and industrial 
- * property rights are retained by XMOS and/or its licensors. 
- * Terms and conditions covering the use of this code can
- * be found in the Xmos End User License Agreement.
- *
- * Copyright XMOS Ltd 2010
- *
- * In the case where this code is a modification of existing code
- * under a separate license, the separate license terms are shown
- * below. The modifications to the code are still covered by the 
- * copyright notice above.
- *
- **/                                   
-#include <xs1.h>
-#include <print.h>
-
-int I2cRegReadC(int device, int addr, chanend c) {
-   int read;
-   int retVal;
-   c <: 0; // isWrite
-   c <: device;
-   c <: addr;
-   c <: 1; // only ever one byte
-   c :> read;
-   c :> retVal;
-   return read;
-}
-
-void I2cRegWriteC(int device, int addr, int data, chanend c) {
-   int retVal;
-   c <: 1; // isWrite
-   c <: device;
-   c <: addr;
-   c <: 1; // only ever one byte
-   c <: data;
-   c :> retVal;
-}
-
-int I2cRegRead(int device, int addr, port scl, port sda)
-{
-    //int Result;
-   timer gt;
-   unsigned time;
-   int Temp, CtlAdrsData, i;
-   // three device ACK
-   int ack[3];
-   int rdData;
-
-   // initial values.
-   scl <: 1;
-   sda  <: 1;
-   sync(sda);
-   gt :> time;
-   time += 1000 + 1000;
-   gt when timerafter(time) :> int _;
-   // start bit on SDI
-   scl <: 1;
-   sda  <: 0;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-   // shift 7bits of address and 1bit R/W (fixed to write).
-   // WARNING: Assume MSB first.
-   for (i = 0; i < 8; i += 1)
-   {
-      Temp = (device >> (7 - i)) & 0x1;
-      sda <: Temp;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 1;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 0;
-   }
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 1;
-   // sample first ACK.
-   sda :> ack[0];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-   
-   CtlAdrsData = (addr & 0xFF);
-   // shift first 8 bits.
-   for (i = 0; i < 8; i += 1)
-   {
-      Temp = (CtlAdrsData >> (7 - i)) & 0x1;
-      sda <: Temp;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 1;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 0;
-   }
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 1;
-   // sample second ACK.
-   sda :> ack[1];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-
-
-   // stop bit
-   gt :> time;
-   time += 1000 + 1000;
-   gt when timerafter(time) :> int _;
-   // start bit on SDI
-   scl <: 1;
-   sda  <: 1;
-   time += 1000 + 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-   time += 1000 + 1000;
-   gt when timerafter(time) :> int _;
-   
-   
-   // send address and read
-   scl <: 1;
-   sda  <: 1;
-   sync(sda);
-   gt :> time;
-   time += 1000 + 1000;
-   gt when timerafter(time) :> int _;
-   // start bit on SDI
-   scl <: 1;
-   sda  <: 0;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-   // shift 7bits of address and 1bit R/W (fixed to write).
-   // WARNING: Assume MSB first.
-   for (i = 0; i < 8; i += 1)
-   {
-      int deviceAddr = device | 1;
-      Temp = (deviceAddr >> (7 - i)) & 0x1;
-      sda <: Temp;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 1;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 0;
-   }
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 1;
-   // sample first ACK.
-   sda :> ack[0];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-   
-   
-   rdData = 0;
-   // shift second 8 bits.
-   for (i = 0; i < 8; i += 1)
-   {
-      
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 1;
-
-      sda :> Temp;
-      rdData = (rdData << 1) | (Temp & 1);
-      
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> int _;
-      scl <: 0;
-   }
-   
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 1;
-   // sample second ACK.
-   sda :> ack[2];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 0;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> int _;
-   scl <: 1;
-   // put the data to a good value for next round.
-   sda  <: 1;
-   // validate all items are ACK properly.
-   //Result = 0;
-   //for (i = 0; i < 3; i += 1)
-   //{
-      //if ((ack[i]&1) != 0)
-      //{
-         //Result = Result | (1 << i);
-      //}
-   //}
-
-   return rdData;
-}
-
-void I2cRegWrite(int device, int addr, int data,  port scl, port sda)
-{
-   //int Result;
-   timer gt;
-   unsigned time;
-   int Temp, CtlAdrsData, i;
-   // three device ACK
-   int ack[3];
-
-   // initial values.
-   scl <: 1;
-   sda  <: 1;
-   sync(sda);
-
-   gt :> time;
-   time += 1000 + 1000;
-   gt when timerafter(time) :> void;
-
-   // start bit on SDI
-   scl <: 1;
-   sda  <: 0;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 0;
-
-   // shift 7bits of address and 1bit R/W (fixed to write).
-   // WARNING: Assume MSB first.
-   for (i = 0; i < 8; i += 1)
-   {
-      Temp = (device >> (7 - i)) & 0x1;
-      sda <: Temp;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> void;
-      scl <: 1;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> void;
-      scl <: 0;
-   }
-
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 1;
-
-   // sample first ACK.
-   sda :> ack[0];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 0;
-
-   CtlAdrsData = (addr & 0xFF);
-
-   // shift first 8 bits.
-   for (i = 0; i < 8; i += 1)
-   {
-      Temp = (CtlAdrsData >> (7 - i)) & 0x1;
-      sda <: Temp;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> void;
-      scl <: 1;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> void;
-      scl <: 0;
-   }
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 1;
-   // sample second ACK.
-   sda :> ack[1];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 0;
-
-   CtlAdrsData = (data & 0xFF);
-   // shift second 8 bits.
-   for (i = 0; i < 8; i += 1)
-   {
-      Temp = (CtlAdrsData >> (7 - i)) & 0x1;
-      sda <: Temp;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> void;
-      scl <: 1;
-      gt :> time;
-      time += 1000;
-      gt when timerafter(time) :> void;
-      scl <: 0;
-   }
-   // turn the data to input
-   sda :> Temp;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 1;
-   // sample second ACK.
-   sda :> ack[2];
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 0;
-   gt :> time;
-   time += 1000;
-   gt when timerafter(time) :> void;
-   scl <: 1;
-   // put the data to a good value for next round.
-   sda  <: 1;
-   // validate all items are ACK properly.
-   //Result = 0;
-   //for (i = 0; i < 3; i += 1)
-   //{
-      //if ((ack[i]&1) != 0)
-      //{
-         //Result = Result | (1 << i);
-      //}
-   //}
-   //return(Result);
-}