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jtag_driver.h

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/*--------------------------------------------------------------------
 * jtag_driver.h -- JTAG Bit Level Driver Abstract Definition  
 *--------------------------------------------------------------------
 * $Id: jtag_driver.h,v 1.1 2003/04/08 08:59:53 cgaudin Exp $
 *--------------------------------------------------------------------
 * This file is part of JTAG Framework
 * Copyright (c) in 2002, 2003 by 
 *   Julien Pilet      <julien.pilet@epfl.ch> and
 *   Stephane Magnenat <stephane.magnenat@epfl.ch> and
 *   Cédric Gaudin     <cedric.gaudin@epfl.ch>
 *--------------------------------------------------------------------
 * JTAG Framework 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.
 *
 * JTAG Framework 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 Foobar; if not, write to: 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, Boston, MA  02111-1307  USA
 *--------------------------------------------------------------------
 * Platform independent
 *--------------------------------------------------------------------*/

#ifndef _JTAG_DRIVER_H_
#define _JTAG_DRIVER_H_

// Signals Constants
#define SIGNAL_TMS       0 // JTAG Mode Select
#define SIGNAL_TDI       1 // JTAG Data Input
#define SIGNAL_CPU_RESET 2 // CPU RESET*

class JTAG_Driver
{
public:
  virtual bool init( int argc , 
                     char **argv ) = 0;
  
  // \!param signal - signal to change
  // \!param value - binary value that signal must be 
  // \!param clock - generate a clock edge
  // \!param test - use direct or buffered write
  virtual bool drive_signal( int signal ,
                             bool value ,
                             bool clock ,
                             bool test ) = 0;
 
  // \!param bit_count - number of bits to exchange
  // \!param data - value to write to IC via TDI
  // \!param instruction - tell whether it's an instruction or
  //                       a data bit vector 
  virtual unsigned long transfer_data( int bit_count , 
                                       unsigned long data , 
                                       bool instruction ) = 0;

  virtual void flush() = 0;

  virtual const char *getName() const = 0;
  
  //virtual char *getErrorMessage() = 0;

};

#endif // _JTAG_DRIVER_H_

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