diff -r -u5 -N -x CVS -x *~ -x .#* cvs/ecos/packages/io/i2c/current/ChangeLog work/ecos/packages/io/i2c/current/ChangeLog
--- cvs/ecos/packages/io/i2c/current/ChangeLog	Fri Jul 15 13:52:27 2005
+++ work/ecos/packages/io/i2c/current/ChangeLog	Sun Oct 15 20:01:12 2006
@@ -1,5 +1,11 @@
+2006-10-15  Csordas, Peter <csordas@mit.bme.hu>
+        * src/i2c.cxx
+        * include/i2c.h : added function: 
+           cyg_bool cyg_i2c_transfer_mode(cyg_i2c_device*, cyg_bool);
+          Interface for switching between polled and IT driven transfer
+           
 2005-06-30  Bart Veer  <bartv@ecoscentric.com>
 
 	* src/i2c.cxx (cyg_i2c_init): remove incorrect const
 
 2005-05-11  Bart Veer  <bartv@ecoscentric.com>
Binary files cvs/ecos/packages/io/i2c/current/doc/~$i2c.rtf and work/ecos/packages/io/i2c/current/doc/~$i2c.rtf differ
diff -r -u5 -N -x CVS -x *~ -x .#* cvs/ecos/packages/io/i2c/current/include/i2c.h work/ecos/packages/io/i2c/current/include/i2c.h
--- cvs/ecos/packages/io/i2c/current/include/i2c.h	Sat May 14 09:31:03 2005
+++ work/ecos/packages/io/i2c/current/include/i2c.h	Sun Oct 15 20:23:22 2006
@@ -64,10 +64,13 @@
     cyg_uint16          i2c_address;
     cyg_uint16          i2c_flags;
     cyg_uint32          i2c_delay;
 } cyg_i2c_device;
 
+//i2c_flags bitmasks
+#define CYG_I2C_POLLED_MODE 1
+
 #define CYG_I2C_DEFAULT_DELAY   10000
 
 // A utility macro for defining an I2C device
 #define CYG_I2C_DEVICE(_name_, _bus_, _address_, _flags_, _delay_)  \
     cyg_i2c_device _name_ = {                                       \
@@ -111,10 +114,11 @@
 // simple transmits and receives, and transaction-oriented routines
 // for more complicated operations including those involving repeated
 // starts.
 externC cyg_uint32  cyg_i2c_tx(const cyg_i2c_device*, const cyg_uint8*, cyg_uint32);
 externC cyg_uint32  cyg_i2c_rx(const cyg_i2c_device*, cyg_uint8*, cyg_uint32);
+externC cyg_bool    cyg_i2c_transfer_mode(cyg_i2c_device*, cyg_bool);
 externC void        cyg_i2c_transaction_begin(const cyg_i2c_device*);
 externC cyg_bool    cyg_i2c_transaction_begin_nb(const cyg_i2c_device*);
 externC cyg_uint32  cyg_i2c_transaction_tx(const cyg_i2c_device*, cyg_bool, const cyg_uint8*, cyg_uint32, cyg_bool);
 externC cyg_uint32  cyg_i2c_transaction_rx(const cyg_i2c_device*, cyg_bool, cyg_uint8*, cyg_uint32, cyg_bool, cyg_bool);
 externC void        cyg_i2c_transaction_stop(const cyg_i2c_device*);
diff -r -u5 -N -x CVS -x *~ -x .#* cvs/ecos/packages/io/i2c/current/src/i2c.cxx work/ecos/packages/io/i2c/current/src/i2c.cxx
--- cvs/ecos/packages/io/i2c/current/src/i2c.cxx	Fri Jul 15 13:52:27 2005
+++ work/ecos/packages/io/i2c/current/src/i2c.cxx	Sun Oct 15 20:11:02 2006
@@ -124,17 +124,35 @@
     result = cyg_i2c_transaction_rx(dev, true, buf, count, true, true);
     cyg_i2c_transaction_end(dev);
     return result;
 }
 
+//Chose transaction method: polled or IT driven
+// Handles the CYG_I2C_POLLED_MODE bit of i2c_flags, that should be checked in the implemented bus functions
+extern "C" cyg_bool
+cyg_i2c_transfer_mode(cyg_i2c_device* dev, cyg_bool polled)
+{
+  //Do not change transaction mode during transfer
+  //(we do not know, whether current or other divece is transfering, but we can afford this...)
+  if (cyg_drv_mutex_trylock(&(dev->i2c_bus->i2c_lock)))
+  {
+    if(polled) dev->i2c_flags=(dev->i2c_flags)|CYG_I2C_POLLED_MODE;
+    else dev->i2c_flags=(dev->i2c_flags)&(~CYG_I2C_POLLED_MODE);
+    cyg_drv_mutex_unlock(&(dev->i2c_bus->i2c_lock));
+    return(true);
+  }
+  return false;
+}
+
+
 // Transaction begin/end relate to the per-bus locking. There does not
 // seem to be any need to interact with the hardware at this point.
 extern "C" void
 cyg_i2c_transaction_begin(const cyg_i2c_device* dev)
 {
     cyg_i2c_bus*    bus;
-    
+
     CYG_CHECK_DATA_PTR(dev, "valid I2C device pointer required");
     bus = dev->i2c_bus;
     CYG_CHECK_DATA_PTR(bus, "I2C device does not point at a valid bus structure");
 
     while (! cyg_drv_mutex_lock(&(bus->i2c_lock)));