A copy of very incomplete program for forum
Dependencies: mbed SDFileSystem
Diff: OneWireCRC.h
- Revision:
- 0:bfcb5b67b1d6
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OneWireCRC.h Sat Mar 17 14:15:20 2012 +0000 @@ -0,0 +1,139 @@ +/* +* OneWireCRC. This is a port to mbed of Jim Studt's Adruino One Wire +* library. Please see additional copyrights below this one, including +* references to other copyrights. +* +* Copyright (C) <2009> Petras Saduikis <petras@petras.co.uk> +* +* This file is part of OneWireCRC. +* +* OneWireCRC 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. +* +* OneWireCRC 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 OneWireCRC. If not, see <http://www.gnu.org/licenses/>. +*/ +/* +Copyright (c) 2007, Jim Studt + +Updated to work with arduino-0008 and to include skip() as of +2007/07/06. --RJL20 + +Modified to calculate the 8-bit CRC directly, avoiding the need for +the 256-byte lookup table to be loaded in RAM. Tested in arduino-0010 +-- Tom Pollard, Jan 23, 2008 + +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 THE AUTHORS OR COPYRIGHT HOLDERS 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. + +Much of the code was inspired by Derek Yerger's code, though I don't +think much of that remains. In any event that was.. + (copyleft) 2006 by Derek Yerger - Free to distribute freely. + +The CRC code was excerpted and inspired by the Dallas Semiconductor +sample code bearing this copyright. +*/ +//--------------------------------------------------------------------------- +// 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. +//-------------------------------------------------------------------------- + +#ifndef SNATCH59_ONEWIRECRC_H +#define SNATCH59_ONEWIRECRC_H + +#include <mbed.h> + +// Select the table-lookup method of computing the 8-bit CRC by setting this to 1 +#ifndef ONEWIRE_CRC8_TABLE +#define ONEWIRE_CRC8_TABLE 1 +#endif + +typedef unsigned char BYTE; // used to be uint8_t : something a byte wide, whatever .... + +enum eSpeed {OVERDRIVE, STANDARD}; + +class OneWireCRC +{ +public: + OneWireCRC(PinName oneWire, eSpeed); + + // reset, read, write functions + int reset(); + void writeByte(int data); + int readByte(); + int touchByte(int data); + void block(BYTE* data, int data_len); + int overdriveSkip(BYTE* data, int data_len); + BYTE *get_address(); + + // address functions + void matchROM(BYTE rom[8]); + void skipROM(); + + // address search functions + void resetSearch(); + BYTE search(BYTE* newAddr); + + // CRC check functions + static BYTE crc8(BYTE* addr, BYTE len); + static unsigned short crc16(unsigned short* data, unsigned short len); + +private: + const int* timing; + + BYTE address[8]; + int searchJunction; // so we can set to it -1 somewhere + bool searchExhausted; + + DigitalInOut oneWirePort; + + // read/write bit functions + void writeBit(int bit); + int readBit(); +}; + +#endif