File content as of revision 0:0f7bbfde44b7:

/*
* OneWireEEPROM. Library for Maxim One-Wire EEPROM.
*
* see http://www.maxim-ic.com
*
* DS2433
* DS28EC20
*
* Copyright (C) <2011> Wim De Roeve <wim312@gmail.com>
*
* Uses the OneWireCRC library. http://mbed.org/users/snatch59/programs/OneWireCRC/gpdz56
*
* OneWireEEPROM 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 3 of the License, or
* (at your option) any later version.
*
* OneWireEEPROM 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
* If not, see <http://www.gnu.org/licenses/>.
*/

#include "mbed.h"
#include "OneWireEEPROM.h"

Serial output(USBTX, USBRX);

OneWireEEPROM::OneWireEEPROM(PinName pin, bool crcOn, bool useAddr, bool parasitic, DSTYPE ds)
        :oneWire(pin, STANDARD) {
    _useCRC=crcOn;
    _useAddress=useAddr;
    _useParasiticPower=parasitic;
    switch (ds) {
        case DS2433: {
            _pages = DS2433PAGES;
            _eeprom_id =DS2433EEPROM_ID;
            break;
        }
        case DS28EC20: {
            _pages =DS28EC20PAGES;
            _eeprom_id =DS28EC20EEPROM_ID;
            break;
        }

    }
    _memsize = _pages * PAGESIZE;
}


bool OneWireEEPROM::Initialize(uint8_t* ROMaddress) {

    active=false;

    output.printf("\r\nScan for One-Wire devices\r\n");

    oneWire.resetSearch();
    if (!oneWire.search(oneWire.ROMCode)) { // search for 1-wire device with address
        //   pc_OneWireEEPROM.traceOut("No One-Wire Device found.\r\n");
        wait_ms(100);
        return false;
    }

    output.printf("Address = ");
    for (int i = 0; i < ADDRESS_SIZE; i++) {
        output.printf("%x ", (int)oneWire.ROMCode[i]);
    }

    output.printf("\r\n");

    if (OneWireCRC::crc8(oneWire.ROMCode, ADDRESS_CRC_BYTE) != oneWire.ROMCode[ADDRESS_CRC_BYTE]) { // check address CRC is valid
        output.printf("CRC is not valid!\r\n");
        wait_ms(100);

        return false;
    }

    if (oneWire.ROMCode[0] !=  _eeprom_id) {
        output.printf("Device is not a OneWireEEPROM_ID device.\r\n");
        wait_ms(100);
        return false;
    }

    if (_useAddress) {
        bool wrong=false;
        for (int i = 0; i < ADDRESS_SIZE; i++) {
            if (oneWire.ROMCode[i]!=ROMaddress[i])
                wrong=true;

            if (!wrong) {
                output.printf("OneWireEEPROM present and correct.\r\n");
                active=true;
                return true;
            } else {
                output.printf("other OneWireEEPROM found\r\n");
                return false;
            }
        }
    } else {
        active=true;
        return true;
    }
    return false;
}

void OneWireEEPROM::ResetAndAddress() {
    oneWire.reset();                // reset device
    if (_useAddress) {
        oneWire.matchROM(ROMCode);  // select which device to talk to
    } else {
        oneWire.skipROM();          // broadcast
    }
}

bool OneWireEEPROM::WriteMemory(uint8_t* Source, uint16_t Address, uint8_t Size) {
    uint8_t _ES; //store Endif Address , datastatus
    uint8_t B;

    if (Address<_memsize) {
        uint8_t _TA1=(uint8_t)(Address & 0x00FF);
        uint8_t _TA2=(uint8_t)((Address & 0xFF00)>>8);

        if ((Size<=PAGESIZE) and ((Size+Address)<=_memsize)) {

            output.printf ("\r\nWriting to OneWireEEPROM %i Bytes",Size);

            ResetAndAddress();
            oneWire.writeByte(WRITESCRATCHPAD);
            oneWire.writeByte(_TA1); //begin address T7..T0
            oneWire.writeByte(_TA2); //begin address T15..T8

            //write _memPage to scratchpad

            for (int i = 0; i < Size; i++) {
                oneWire.writeByte(Source[i]);
//               pc_OneWireEEPROM.traceOut ("%X ",Source[i]);
            }
            //   pc_OneWireEEPROM.traceOut ("\r\nTA1=%X",_TA1);
            //   pc_OneWireEEPROM.traceOut ("\r\nTA2=%X\r\n",_TA2);

            //read and check data in scratchpad
            ResetAndAddress();
            oneWire.writeByte(READSCRATCHPAD);
            B=oneWire.readByte();
            if (B != _TA1) { //check TA1, return if bad
                output.printf("\r\nWrite error in TA1 %X - %X\r\n",B,_TA1);
                return false;
            }
            B=oneWire.readByte();
            if (B != _TA2) { //check TA2, return if bad
                output.printf("\r\nWrite error in TA2 %X - %X\r\n",B,_TA2);
                return false;
            }
            _ES = oneWire.readByte(); // ES Register

            //check data written
            for (int i = 0; i < Size; i++) {
                B=oneWire.readByte();
                if (B != Source[i]) { //return if bad
                    output.printf("\r\nWrite error in scratchpad on %i %X<->%X\r\n",i,B ,Source[i]);
                    return false;
                }
            }

            output.printf("\r\nES=%X\r\n",_ES);

            //issue copy with auth data
            wait_ms(10);
            ResetAndAddress();
            oneWire.writeByte(COPYSCRATCHPAD);
            oneWire.writeByte(_TA1);
            oneWire.writeByte(_TA2);
            oneWire.writeByte(_ES); //pull-up!
            wait_ms(10); //10ms min strong pullup delay -> time needed to copy from scratchpad to memory

            oneWire.reset();

            output.printf ("\r\nData written\r\n");
            return true;
        } else {
            output.printf ("\r\nTrying to write more then %i bytes-> %i\r\n",PAGESIZE,Size);
            return false;
        }
    } else {
        output.printf ("\r\nAddress %X not available, EEPROM isn't that bigg..-> %i\r\n",Address);
        return false;
    }
}


int OneWireEEPROM::ReadMemory(uint8_t* Destination, uint16_t Address, uint16_t Size) {
    uint8_t tmpReader;
    bool readFF = 0;
    int memPtr;

    if (Address<_memsize) {

        uint8_t _TA1=(uint8_t)(Address & 0x00FF);
        uint8_t _TA2=(uint8_t)((Address & 0xFF00)>>8);

        if ((Size+Address)<=_memsize) {

            ResetAndAddress();
            oneWire.writeByte(READMEMORY);
            oneWire.writeByte(_TA1);
            oneWire.writeByte(_TA2);

            output.printf ("\r\nReading... TA1=%X TA2=%X",_TA1, _TA2);

            for (memPtr = 0; memPtr < Size; memPtr++) {
                tmpReader = oneWire.readByte();
                if (tmpReader == 0xff & !readFF)
                    readFF = 1;
                else if (tmpReader == 0xff & readFF)
                    // 0xff read twice, hopefully EoF as we break here :)
                    break;

                Destination[memPtr] = tmpReader;
            }
            output.printf ("-> %i byte(s)\r\n",memPtr);
            return memPtr;

        }  else {
            output.printf ("\r\nTrying to read outside MEMORY -> %i\r\n",Address+Size);
            return 0;
        }
    } else {
        output.printf ("\r\nAddress %X not available, EEPROM isn't that bigg..-> %i\r\n",Address);
        return 0;
    }
}

void OneWireEEPROM::ShowMemory(int PageFrom, int PageTo) {
    int Size;
    if ((PageFrom>=0) and (PageFrom<_pages) and
            (PageTo>=0) and (PageTo<_pages)) {

        uint8_t *MemAll = (uint8_t*) malloc(_memsize);

        output.printf ("\r\nRead Page(s) from EEPROM\r\n");

        Size=ReadMemory(MemAll,0x0000,_memsize);

        for (int j=PageFrom;j<=PageTo;j++) {
            output.printf ("\r\nPage %2i ->",j);
            for (int i=0;i<PAGESIZE;i++) {
                if ((j*32+i)<= Size)
                    output.printf("%2X ",MemAll[j*32+i]);
            }
            if ((j*32)>Size)
                break;
        }
        output.printf ("\r\n");

        free(MemAll);
    }
}