/*  myTemp is used to connect PalmOS PDAs to Dallas Microlan(tm) Devices.  It currently supports DS1820/DS18S20 Digital Thermometers  Copyright (C) 2000 Christof Klaiber  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 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., 59 Temple  Place, Suite 330, Boston, MA  02111-1307  USA  Christof Klaiber <cklaiber@users.sourceforge.net>  Lachnerstr. 22  76131 Karlsruhe  Germany*/#include <PalmOS.h>#include "com.h"#include "ds1820.h"#include "onewire.h"UInt32	DSDispatchTouchByteErr(Err);UInt32	DSDispatchTouchResetErr(Err);UInt32 DSDispatchTouchByteErr(Err err){	UInt32	dsErr;		switch (err)	{	case 0:		dsErr = tempNoError;		break;	case serErrTimeOut:		dsErr = tempSerErrTimeOut;		break;	case serErrLineErr:		dsErr = tempSerErrLineErr;		break;	default:		ErrDisplay("unknown error in touch byte");		dsErr =	tempErrUnknownErr;		break;	}	return dsErr;}UInt32 DSDispatchTouchResetErr(Err err){	UInt32	dsErr;		switch (err)	{	case 0:		dsErr = tempNoError;		break;	case serErrBadParam:		ErrDisplay("invalid parameter");		dsErr = tempSerErrBadParam;		break;	case serErrNotOpen:		ErrDisplay("serial port not open");		dsErr = tempSerErrNotOpen;		break;	case serErrTimeOut:		dsErr = tempSerErrTimeOut;		break;	case serErrLineErr:		dsErr = tempSerErrLineErr;		break;	default:		ErrDisplay("unknown error in touch reset");		dsErr = tempErrUnknownErr;		break;	}	return dsErr;}UInt32 DSReadScratchpad(UInt16 serialRefNum, UInt8 scPad[kScratchPadLength]) {	UInt8	x;	UInt8	crc;	UInt8	exOrResult;	Err		err;	UInt8	character;/* CRC table for Dallas 8-bit CRC calculations from App Note #27 */	UInt8 crc_table[] = {		0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,		157,195, 33,127,252,162, 64, 30, 95,  1,227,189, 62, 96,130,220,		35,125,159,193, 66, 28,254,160,225,191, 93,  3,128,222, 60, 98,		190,224,  2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,		70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89,  7,		219,133,103, 57,186,228,  6, 88, 25, 71,165,251,120, 38,196,154,		101, 59,217,135,  4, 90,184,230,167,249, 27, 69,198,152,122, 36,		248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91,  5,231,185,		140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,		17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,		175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,		50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,		202,148,118, 40,171,245, 23, 73,  8, 86,180,234,105, 55,213,139,		87,  9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,		233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,		116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53	};		character = 0xbe;	err = OWTouchByte(serialRefNum, &character); 	if (err)	{		return DSDispatchTouchByteErr(err);	}			for(x = 0; x < 9; x++) {		character = 0xff;		err = OWTouchByte(serialRefNum, &character);		if (err)		{			return DSDispatchTouchByteErr(err);		}		scPad[x] = character;	}		err = OWTouchReset(serialRefNum, &character);	ErrNonFatalDisplayIf(character == 0, "no 1-Wire device found");	if (err)	{		return DSDispatchTouchResetErr(err);	}	if (!character)	{		return tempOWErrNothingDetected;	}		crc = 0;		for(x = 0; x < 9; x++)	{		exOrResult = crc ^ scPad[x];		crc = crc_table[exOrResult];	}	if (crc)	{		return tempErrCRCErr;	}		return err;}UInt32 DSReadTemperature(UInt16 serialRefNum) {	Err		err;	UInt8	character = 0x44;	err = OWTouchByte(serialRefNum, &character);	if (err)	{		return DSDispatchTouchByteErr(err);	}		return err;	}UInt32 DSResetTemperature(UInt16 serialRefNum){	Err		err;	UInt8	character;		err = OWTouchReset(serialRefNum, &character);	ErrNonFatalDisplayIf(character == 0, "no 1-Wire device found");	if (err)	{		return DSDispatchTouchResetErr(err);	}	if (!character)	{		return tempOWErrNothingDetected;	}	return err;}UInt32 DSSkipROM(UInt16 serialRefNum) {	Err	err;	UInt8	character;		err = OWTouchReset(serialRefNum, &character);	ErrNonFatalDisplayIf(character == 0, "no 1-Wire device found");	if (err)	{		return DSDispatchTouchResetErr(err);	}	if (!character)	{		return tempOWErrNothingDetected;	}		character=0xcc;	err = OWTouchByte(serialRefNum, &character);	if (err)	{		return DSDispatchTouchByteErr(err);	}	return err;}