diff --git a/mcu/driver/drv/src/bf.c b/mcu/driver/drv/src/bf.c
new file mode 100644
index 0000000..4b920a2
--- /dev/null
+++ b/mcu/driver/drv/src/bf.c
@@ -0,0 +1,483 @@
+/*****************************************************************************
+*  Copyright Statement:
+*  --------------------
+*  This software is protected by Copyright and the information contained
+*  herein is confidential. The software may not be copied and the information
+*  contained herein may not be used or disclosed except with the written
+*  permission of MediaTek Inc. (C) 2005
+*
+*  BY OPENING THIS FILE, BUYER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
+*  THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
+*  RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO BUYER ON
+*  AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
+*  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
+*  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
+*  NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
+*  SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
+*  SUPPLIED WITH THE MEDIATEK SOFTWARE, AND BUYER AGREES TO LOOK ONLY TO SUCH
+*  THIRD PARTY FOR ANY WARRANTY CLAIM RELATING THERETO. MEDIATEK SHALL ALSO
+*  NOT BE RESPONSIBLE FOR ANY MEDIATEK SOFTWARE RELEASES MADE TO BUYER'S
+*  SPECIFICATION OR TO CONFORM TO A PARTICULAR STANDARD OR OPEN FORUM.
+*
+*  BUYER'S SOLE AND EXCLUSIVE REMEDY AND MEDIATEK'S ENTIRE AND CUMULATIVE
+*  LIABILITY WITH RESPECT TO THE MEDIATEK SOFTWARE RELEASED HEREUNDER WILL BE,
+*  AT MEDIATEK'S OPTION, TO REVISE OR REPLACE THE MEDIATEK SOFTWARE AT ISSUE,
+*  OR REFUND ANY SOFTWARE LICENSE FEES OR SERVICE CHARGE PAID BY BUYER TO
+*  MEDIATEK FOR SUCH MEDIATEK SOFTWARE AT ISSUE. 
+*
+*  THE TRANSACTION CONTEMPLATED HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE
+*  WITH THE LAWS OF THE STATE OF CALIFORNIA, USA, EXCLUDING ITS CONFLICT OF
+*  LAWS PRINCIPLES.  ANY DISPUTES, CONTROVERSIES OR CLAIMS ARISING THEREOF AND
+*  RELATED THERETO SHALL BE SETTLED BY ARBITRATION IN SAN FRANCISCO, CA, UNDER
+*  THE RULES OF THE INTERNATIONAL CHAMBER OF COMMERCE (ICC).
+*
+*****************************************************************************/
+
+/*****************************************************************************
+ *
+ * Filename:
+ * ---------
+ *    bf.c
+ *
+ * Project:
+ * --------
+ *   Maui_Software
+ *
+ * Description:
+ * ------------
+ *   This Module defines the ring-buffer API
+ *
+ * Author:
+ * -------
+ * -------
+ *
+ *============================================================================
+ *             HISTORY
+ * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
+ *------------------------------------------------------------------------------
+ * removed!
+ * removed!
+ * removed!
+ *
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ * removed!
+ *------------------------------------------------------------------------------
+ * Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
+ *============================================================================
+ ****************************************************************************/
+#include "drv_comm.h"
+#include "bmd.h"
+
+
+/*
+* FUNCTION                                                            
+*	Buff_init
+*
+* DESCRIPTION                                                           
+*   	This function is to let a memory area become a ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	Buffaddr: the start addr of memory area
+*	uTotalSize: the size of the memory area
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void Buff_init(BUFFER_INFO *Buf,kal_uint8 *Buffaddr, kal_uint16 uTotalSize)
+{	
+	Buf->Read = 0;
+	Buf->Write = 0;
+	Buf->Length = uTotalSize;
+	Buf->CharBuffer = Buffaddr;
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_Push
+*
+* DESCRIPTION                                                           
+*   	This function is to put a data to ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	*pushData: the data will be put into ring-buffer
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void Buff_Push(BUFFER_INFO *Buf,kal_uint8 *pushData)
+{
+	*BuffWrite(Buf) = *pushData;	
+	BWrite(Buf)++;
+	if (BWrite(Buf) >= BLength(Buf))
+	{
+		BWrite(Buf) -= BLength(Buf);
+	}
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_Pop
+*
+* DESCRIPTION                                                           
+*   	This function is to pop a data from ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	*popData: the data will be pop from ring-buffer
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void Buff_Pop(BUFFER_INFO *Buf,kal_uint8 *popData)
+{
+	*popData= *BuffRead(Buf);
+	BRead(Buf)++;
+	if (BRead(Buf) >= BLength(Buf))
+	{
+		BRead(Buf) -= BLength(Buf);
+	}
+
+}
+
+void Buff_look(BUFFER_INFO *Buf,kal_uint8 *popData,kal_uint8 num)
+{
+   kal_uint8 index;
+   kal_uint16 tmp;
+   
+   tmp = BRead(Buf);
+   for(index=0;index<num;index++)
+   {
+	   *popData= *(Buf->CharBuffer+tmp);
+	   
+	   tmp++;
+	   if (tmp >= BLength(Buf))
+	   {
+		   tmp -= BLength(Buf);
+	   }
+	}
+}
+/*
+* FUNCTION                                                            
+*	Buff_IsEmpty
+*
+* DESCRIPTION                                                           
+*   	This function is check whether ring-buffer is empty
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+kal_uint8 Buff_IsEmpty(BUFFER_INFO *Buf)
+{
+	kal_uint8 status;
+	if ( BRead(Buf) == BWrite(Buf) ) 
+	{
+		status = Buff_isEmpty;
+	}
+	else
+	{
+		status = Buff_notEmpty;
+	}
+	return status;
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_IsFull
+*
+* DESCRIPTION                                                           
+*   	This function is check whether ring-buffer is full
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+kal_uint8 Buff_IsFull (BUFFER_INFO *Buf)
+{
+	kal_uint8 status;
+	kal_uint16 tmp = BRead(Buf);
+	if (tmp == 0)
+		tmp = BLength(Buf);
+
+	if ( (tmp-BWrite(Buf)) == 1)
+	{
+		status = Buff_isFull;
+	}
+	else
+	{
+		status = Buff_notFull;
+	}
+	return status;
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_GetRoomLeft
+*
+* DESCRIPTION                                                           
+*   	This function is obtain the size of the residual space 
+*	in ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	
+* RETURNS
+*	the size of the residual space 
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+kal_uint16 Buff_GetRoomLeft (BUFFER_INFO *Buf)
+{
+	kal_uint16	RoomLeft = 0;
+	if ( BRead(Buf) <= BWrite(Buf) ) 
+	{
+                RoomLeft = BLength(Buf) - BWrite(Buf) + BRead(Buf) - 1;
+	}
+	else
+	{
+		RoomLeft = BRead(Buf) - BWrite(Buf) - 1;
+	}
+
+	return RoomLeft;
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_GetBytesAvail
+*
+* DESCRIPTION                                                           
+*   	This function is obtain the size of the used space 
+*	in ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	
+* RETURNS
+*	the size of the used space
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+kal_uint16 Buff_GetBytesAvail (BUFFER_INFO *Buf)
+{
+	kal_uint16	BytesAvail = 0;
+	if (BWrite(Buf) >= BRead(Buf))
+		BytesAvail = BWrite(Buf) - BRead(Buf);
+	else 
+		BytesAvail = BLength(Buf) - BRead(Buf) + BWrite(Buf);	
+
+	return BytesAvail;
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_GetLength
+*
+* DESCRIPTION                                                           
+*   	This function is to obtain the total size of the ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	
+* RETURNS
+*	the total size of the ring-buffer
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+kal_uint16 Buff_GetLength(BUFFER_INFO *Buf)
+{
+	return Buf->Length;
+}
+
+/*
+* FUNCTION                                                            
+*	Buff_Flush
+*
+* DESCRIPTION                                                           
+*   	This function is to reset the ring-buffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void Buff_Flush (BUFFER_INFO *Buf)
+{
+	Buf->Write = Buf->Read = 0;
+}
+
+/*
+* FUNCTION                                                            
+*	Get32FromBuff
+*
+* DESCRIPTION                                                           
+*   	This function is to obtain a 32bit data from ringbuffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	*DATA: the data will be obtain from ringbuffer
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void Get32FromBuff(BUFFER_INFO *Buf,kal_uint32 *DATA)
+{
+	kal_uint8	tmp,index;
+	kal_uint32 	tmp32;
+	*DATA =0;
+	for (index =0;index < 4;index++)
+	{
+		Buff_Pop(Buf,&tmp);
+		tmp32 = (kal_uint32)tmp;
+		//(*DATA) |= (tmp32 << (24-8*index));
+		(*DATA) |= (tmp32 << (8*index));
+	}
+}
+
+/*
+* FUNCTION                                                            
+*	Put32toBuff
+*
+* DESCRIPTION                                                           
+*   	This function is to put a 32bit data to ringbuffer
+*
+* CALLS  
+*
+* PARAMETERS
+*	*Buf: struct of BUFFER_INFO
+*	*DATA: the data will be put into ringbuffer
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void Put32toBuff(BUFFER_INFO *Buf,kal_uint32 *DATA)
+{
+	kal_uint8	tmp,index;
+	kal_uint32 	tmp32;
+	for (index =0;index < 4;index++)
+	{
+		//tmp32 = ((*DATA) >> (24-8*index));
+		tmp32 = ((*DATA) >> (8*index));
+		tmp = (kal_uint8)tmp32;		
+		Buff_Push(Buf,&tmp);
+	}		
+}
+
+/*
+* FUNCTION                                                            
+*	MemCPY
+*
+* DESCRIPTION                                                           
+*   	This function is to copy memory block
+*
+* CALLS  
+*
+* PARAMETERS
+*	dst: destination address.
+*	src: source address.
+*	len: copy length
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void MemCPY(kal_uint8 *dst,kal_uint8 *src,kal_uint32 len)
+{
+	kal_uint32 index;
+	for (index = 0; index < len; index++) 
+		*dst++ = *src++;
+}
+
+/*
+* FUNCTION                                                            
+*	MemSET
+*
+* DESCRIPTION                                                           
+*   	This function is to set a value to a memory blcok
+*
+* CALLS  
+*
+* PARAMETERS
+*	dst: destination address.
+*	len: copy length
+*	data: the value
+*	
+* RETURNS
+*	None
+*
+* GLOBALS AFFECTED
+*   external_global
+*/
+void MemSET(kal_uint8 *dst,kal_uint8 data,kal_uint32 len)
+{
+	kal_uint32 index;
+	for (index = 0; index < len; index++) 
+		*dst++ = data;
+}
+