text: /*****************************************************************************
  ** $Source: /cygdrive/d/Private/_SVNROOT/bluemsx/blueMSX/Src/IoDevice/I8251.h,v $
  **
  ** $Revision: 1.7 $
  **
  ** $Date: 2008-03-31 19:42:19 $
  **
  ** More info: http://www.bluemsx.com
  **
  ** Copyright (C) 2003-2006 Daniel Vik, Tomas Karlsson
  **
  ** This program is free software; you can redistribute it and/or modify
  ** it under the terms of the GNU General Public License as published by
  ** the Free Software Foundation; either version 2 of the License, or
  ** (at your option) any later version.
  ** 
  ** This program is distributed in the hope that it will be useful,
  ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ** GNU General Public License for more details.
  **
  ** You should have received a copy of the GNU General Public License
  ** along with this program; if not, write to the Free Software
  ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  **
  ******************************************************************************
  */
  #ifndef I8251_H
  #define I8251_H
  
  #include "MsxTypes.h"
  
  typedef int  (*I8251Transmit) (void*, UInt8);
  typedef int  (*I8251Signal) (void*);
  typedef void (*I8251Set) (void*, int);
  typedef int  (*I8251Get) (void*);
  
  typedef enum {
      I8251_STOP_INV = 0,
      I8251_STOP_1 = 2,
      I8251_STOP_15 = 3,
      I8251_STOP_2 = 4
  } I8251StopBits;
  
  typedef enum {
      I8251_PARITY_NONE,
      I8251_PARITY_EVEN,
      I8251_PARITY_ODD
  } I8251Parity;
  
  typedef struct I8251 I8251;
  
  UInt8 i8251Peek(I8251* usart, UInt16 port);
  UInt8 i8251Read(I8251* usart, UInt16 port);
  void i8251Write(I8251* usart, UInt16 port, UInt8 value);
  
  void i8251RxData(I8251* usart, UInt8 value);
  
  void i8251LoadState(I8251* usart);
  void i8251SaveState(I8251* usart);
  
  void i8251Reset(I8251* usart);
  void i8251Destroy(I8251* usart); 
  
  I8251* i8251Create(I8251Transmit transmit,    I8251Signal   signal,
                     I8251Set      setDataBits, I8251Set      setStopBits,
                     I8251Set      setParity,   I8251Set      setRxReady,
                     I8251Set      setDtr,      I8251Set      setRts,
                     I8251Get      getDtr,      I8251Get      getRts,
                     void* ref);
  
  #endif
  