//---------------------------------------------------------------------------
// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
// 
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included 
// in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
// MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES 
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 
// OTHER DEALINGS IN THE SOFTWARE.
// 
// Except as contained in this notice, the name of Dallas Semiconductor 
// shall not be used except as stated in the Dallas Semiconductor 
// Branding Policy. 
//---------------------------------------------------------------------------
//
//  VisowLL.C - Link Layer 1-Wire Net functions.
//
//           2.00 -> 3.00  Added owReadBitPower and owWriteBytePower


#include <PalmOS.h>
#include <SystemMgr.h>
#include "SauthPalm.h"

// External functions
uchar DOWReset(void);
uchar DOWByte(uchar);
extern int RetPort(int);

// local functions
SMALLINT owTouchReset(int);
SMALLINT owTouchBit(int,SMALLINT);
SMALLINT owTouchByte(int,SMALLINT);
SMALLINT owWriteByte(int,SMALLINT);
SMALLINT owReadByte(int);
SMALLINT owSpeed(int,SMALLINT);
SMALLINT owLevel(int,SMALLINT);
SMALLINT owProgramPulse(int);
ulong msGettick(void);
void msDelay(int);
SMALLINT owWriteBytePower(int,SMALLINT);
SMALLINT owReadBitPower(int, SMALLINT);
SMALLINT owHasPowerDelivery(int);
SMALLINT owHasOverDrive(int);
SMALLINT owHasProgramPulse(int);

// external globals
extern int ULevel[MAX_PORTNUM]; // current DS2480 1-Wire Net level
extern int UBaud[MAX_PORTNUM];  // current DS2480 baud rate
extern int UMode[MAX_PORTNUM];  // current DS2480 command or data mode state
extern int USpeed[MAX_PORTNUM]; // current DS2480 1-Wire Net communication speed

// local varable flag, true if program voltage available
static int ProgramAvailable[MAX_PORTNUM];
int old_speed[MAX_PORTNUM];

//--------------------------------------------------------------------------
// Reset all of the devices on the 1-Wire Net and return the result.
//
// 'portnum'    - number 0 to MAX_PORTNUM-1.  This number was provided to
//                OpenCOM to indicate the port number.
//
// Returns: TRUE(1):  presense pulse(s) detected, device(s) reset
//          FALSE(0): no presense pulses detected
//
// WARNING: This routine will not function correctly on some
//          Alarm reset types of the DS1994/DS1427/DS2404 with
//          Rev 1,2, and 3 of the DS2480/DS2480B.
//
SMALLINT owTouchReset(int portnum)
{   
   iBSetup(RetPort(portnum)); 
   return((int)DOWReset());
   		
}

//--------------------------------------------------------------------------
// Send 1 bit of communication to the 1-Wire Net and return the
// result 1 bit read from the 1-Wire Net.  The parameter 'sendbit'
// least significant bit is used and the least significant bit
// of the result is the return bit.
//
// 'portnum' - number 0 to MAX_PORTNUM-1.  This number was provided to
//             OpenCOM to indicate the port number.
// 'sendbit' - the least significant bit is the bit to send
//
// Returns: 0:   0 bit read from sendbit
//          1:   1 bit read from sendbit
//
SMALLINT owTouchBit(int portnum, SMALLINT sendbit)
{
   iBSetup(RetPort(portnum));
   return iBDataBit((uchar) sendbit);
}

//--------------------------------------------------------------------------
// Send 8 bits of communication to the 1-Wire Net and verify that the
// 8 bits read from the 1-Wire Net is the same (write operation).  
// The parameter 'sendbyte' least significant 8 bits are used.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
// 'sendbyte' - 8 bits to send (least significant byte)
//
// Returns:  TRUE: bytes written and echo was the same
//           FALSE: echo was not the same 
//
SMALLINT owWriteByte(int portnum, SMALLINT sendbyte)
{
//jpe   iBSetup(RetPort(portnum));
   return (owTouchByte(portnum,sendbyte) == sendbyte) ? TRUE : FALSE;
}


//--------------------------------------------------------------------------
// Send 8 bits of read communication to the 1-Wire Net and and return the
// result 8 bits read from the 1-Wire Net.   
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
//
// Returns:  8 bytes read from 1-Wire Net
//
SMALLINT owReadByte(int portnum)
{
//jpe   iBSetup(RetPort(portnum));
   return owTouchByte(portnum,0xFF);
}

//--------------------------------------------------------------------------
// Send 8 bits of communication to the 1-Wire Net and return the
// result 8 bits read from the 1-Wire Net.  The parameter 'sendbyte'
// least significant 8 bits are used and the least significant 8 bits
// of the result is the return byte.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
// 'sendbyte' - 8 bits to send (least significant byte)
//
// Returns:  8 bytes read from sendbyte
//
SMALLINT owTouchByte(int portnum, SMALLINT sendbyte)
{
   iBSetup(RetPort(portnum));
   return DOWByte((uchar) sendbyte);
}

//--------------------------------------------------------------------------
// Set the 1-Wire Net communucation speed.  
//
// 'portnum'   - number 0 to MAX_PORTNUM-1.  This number was provided to
//               OpenCOM to indicate the port number.
// 'new_speed' - new speed defined as
//                MODE_NORMAL     0x00
//                MODE_OVERDRIVE  0x01
//
// Returns:  current 1-Wire Net speed 
//
SMALLINT owSpeed(int portnum, SMALLINT new_speed)
{
   int rt = MODE_NORMAL;
   
   if(old_speed[portnum] != new_speed)
   {
   		iBSetup(RetPort(portnum));
   
   		if(new_speed == MODE_OVERDRIVE)
   		{
   			if(iBOverdriveOn())
   				rt = MODE_OVERDRIVE;
   		}
   		else
   		{
   			if(iBOverdriveOff())
				rt = MODE_NORMAL;
		}
   }
   else
   		rt = new_speed;	
   	
   // Code for owSpeed using the Visor is not yet available
   return rt;
}

//--------------------------------------------------------------------------
// Set the 1-Wire Net line level.  The values for new_level are
// as follows:
//
// 'portnum'   - number 0 to MAX_PORTNUM-1.  This number was provided to
//               OpenCOM to indicate the port number.
// 'new_level' - new level defined as
//                MODE_NORMAL     0x00
//                MODE_STRONG5    0x02
//                MODE_PROGRAM    0x04
//                MODE_BREAK      0x08 (not supported)
//
// Returns:  current 1-Wire Net level  
//
SMALLINT owLevel(int portnum, SMALLINT new_level)
{
   // Code for owLevel using the Visor is not yet available.
   // return the current level
   return ULevel[portnum];      
}

//--------------------------------------------------------------------------
// This procedure creates a fixed 480 microseconds 12 volt pulse 
// on the 1-Wire Net for programming EPROM iButtons.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
//
// Returns:  TRUE  successful
//           FALSE program voltage not available  
//
SMALLINT owProgramPulse(int portnum)
{
   // Code for owProgramPulse using the Visor is not yet available.
   return FALSE;
}

//--------------------------------------------------------------------------
//  Description:
//     Delay for at least 'len' ms
// 
void msDelay(int len)
{
	long sysdelay;
	
	sysdelay = (len + 5)/10;
	
	if(sysdelay == 0)
		sysdelay++;
		
	SysTaskDelay(sysdelay);
}

//--------------------------------------------------------------------------
// Get the current millisecond tick count.  Does not have to represent
// an actual time, it just needs to be an incrementing timer.
//
ulong msGettick(void)
{
   return (TimGetTicks()*10);
}

//--------------------------------------------------------------------------
// Send 8 bits of communication to the 1-Wire Net and verify that the
// 8 bits read from the 1-Wire Net is the same (write operation).  
// The parameter 'sendbyte' least significant 8 bits are used.  After the
// 8 bits are sent change the level of the 1-Wire net.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
// 'sendbyte' - 8 bits to send (least significant byte)
//
// Returns:  TRUE: bytes written and echo was the same
//           FALSE: echo was not the same 
//
SMALLINT owWriteBytePower(int portnum, SMALLINT sendbyte)
{
	// not supported on the by the DS520
	return FALSE;
}

//--------------------------------------------------------------------------
// Send 1 bit of communication to the 1-Wire Net and verify that the
// response matches the 'applyPowerResponse' bit and apply power delivery
// to the 1-Wire net.  Note that some implementations may apply the power
// first and then turn it off if the response is incorrect.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
// 'applyPowerResponse' - 1 bit response to check, if correct then start
//                        power delivery 
//
// Returns:  TRUE: bit written and response correct, strong pullup now on
//           FALSE: response incorrect
//
SMALLINT owReadBitPower(int portnum, SMALLINT applyPowerResponse)
{
	// not supported on the by the DS520
	return FALSE;
}

//--------------------------------------------------------------------------
// This procedure indicates wether the adapter can deliver power.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
//
// Returns:  TRUE  if adapter is capable of delivering power. 
//
SMALLINT owHasPowerDelivery(int portnum)
{
   // add adapter specific code here
   return FALSE;
}

//--------------------------------------------------------------------------
// This procedure indicates wether the adapter can deliver power.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
//
// Returns:  TRUE  if adapter is capable of over drive. 
//
SMALLINT owHasOverDrive(int portnum)
{
   // add adapter specific code here
   return FALSE;
}
//--------------------------------------------------------------------------
// This procedure creates a fixed 480 microseconds 12 volt pulse 
// on the 1-Wire Net for programming EPROM iButtons.
//
// 'portnum'  - number 0 to MAX_PORTNUM-1.  This number was provided to
//              OpenCOM to indicate the port number.
//
// Returns:  TRUE  program volatage available
//           FALSE program voltage not available  
SMALLINT owHasProgramPulse(int portnum)
{
   // add adapter specific code here
   return FALSE;
}