ponyprog/at250bus.cpp

//=========================================================================//
//-------------------------------------------------------------------------//
// at250bus.cpp -- AT250x0 (SPI eeproms) Bus Driver                        //
// This file is part of PonyProg.                                          //
//-------------------------------------------------------------------------//
//                                                                         //
//  PonyProg - Serial Device Programmer                                    //
//                                                                         //
//  Copyright (C) 1997-2000  Claudio Lanconelli                            //
//                                                                         //
//  e-mail: lanconel@cs.unibo.it                                           //
//  http://www.cs.unibo.it/~lanconel                                       //
//                                                                         //
//-------------------------------------------------------------------------//
//                                                                         //
// 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 version2 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 (see COPYING);     if not, write to the         //
// Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. //
//                                                                         //
//-------------------------------------------------------------------------//
//=========================================================================//

#include "types.h"
#include "at250bus.h"
#include "errcode.h"

#ifdef	_LINUX_
//#  include <asm/io.h>
#  include <unistd.h>
#else
#  ifdef	__BORLANDC__
#    define	__inline__
#  else // _MICROSOFT_ VC++
#    define	__inline__ __inline
#    define _export
#  endif
#endif

// Costruttore
At250Bus::At250Bus(BusInterface *ptr)
	: SPIBus(ptr),
		WriteEnable(0x06),
		WriteDisable(0x04),
		ReadStatus(0x05),
		WriteStatus(0x01),
		ReadData(0x03),
		WriteData(0x02),
		NotReadyFlag(1),
		WenFlag(2),
		BPFlags(8+4),
		loop_timeout(5000)
{
}

void At250Bus::EndCycle()
{
//	WaitUsec(1);
	setNCS();
	WaitUsec(shot_delay*2);
	clearNCS();
	WaitUsec(shot_delay);
}

int At250Bus::ReadEEPByte(int addr)
{
	int rv;

	SendDataByte( ReadData | (((addr >> 8) & 1) << 3) );
	SendDataByte(addr);

	WaitUsec(shot_delay);

	rv = RecDataByte();

	EndCycle();

	return rv;
}

void At250Bus::WriteEEPByte(int addr, int data)
{
	SendDataByte( WriteData | (((addr >> 8) & 1) << 3) );
	SendDataByte(addr);
	SendDataByte(data);

	EndCycle();
}

int At250Bus::ReadEEPStatus()
{
	int rv;

	SendDataByte(ReadStatus);
	rv = RecDataByte();

	EndCycle();

	return rv;
}

int At250Bus::WriteEEPStatus(int data)
{
	SendDataByte(WriteEnable);
	EndCycle();

	SendDataByte(WriteStatus);
	SendDataByte(data);

	EndCycle();

	return 0;
}

int At250Bus::WaitEndOfWrite(int timeout)		// 07/08/99
{
	if (timeout <= 0)
		timeout = loop_timeout;

	int k;
	for (k = timeout; k > 0 && (ReadEEPStatus() & NotReadyFlag); k--)
		;
	return (k != 0);
}

int At250Bus::Reset(void)
{
	UserDebug(UserApp2, "At250Bus::Reset()\n");

	SPIBus::Reset();

	WaitUsec(shot_delay);

//	SendDataByte(WriteEnable);
//	EndCycle();

	return OK;
}


long At250Bus::Read(int addr, UBYTE *data, long length)
{
	UserDebug3(UserApp2, "At250Bus::Read(%xh, %xh, %ld)\n", addr, (unsigned int)data, length);

	long len;
#if 0
	if (length--)
	{
		*data++ = (UBYTE)ReadEEPByte(addr);
		while (length--)
			*data++ = RecDataByte();
	}
#else
	for (len = 0; len < length; len++)
	{
		*data++ = (UBYTE)ReadEEPByte(addr++);
		if ( CheckAbort(len * 100 / length) )
			break;
	}
	CheckAbort(100);
#endif

	UserDebug1(UserApp2, "At250Bus::Read() = %ld\n", len);

	return len;
}

long At250Bus::Write(int addr, UBYTE const *data, long length)
{
	long len;

	WriteEEPStatus(0);

	// 07/08/99 *** bug fix suggested by Atmel Product engineer
	if (!WaitEndOfWrite())
		return 0;

	for (len = 0; len < length; len++)
	{
		SendDataByte(WriteEnable);
		EndCycle();

		WriteEEPByte(addr++, *data++);

		if (!WaitEndOfWrite())
			return 0;		//Must return 0, because > 0 (and != length) means "Abort by user"

		if ( CheckAbort(len * 100 / length) )
			break;
	}
	CheckAbort(100);

	return len;
}