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1-Wire implementation, using DS2480B controller interfaced with serial port, working example to read DS18B20, based on work already in progress / Dallas - Public domain code
Diff: owsesu.cpp
- Revision:
- 0:1193dbfe28e2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/owsesu.cpp Thu Mar 24 17:21:29 2011 +0000 @@ -0,0 +1,117 @@ +//--------------------------------------------------------------------------- +// 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. +//--------------------------------------------------------------------------- +// +// owSesU.C - Acquire and release a Session on the 1-Wire Net. +// +// Version: 2.01 +// +// History: 1.03 -> 2.00 Changed 'MLan' to 'ow'. Added support for +// multiple ports. +// 2.00 -> 2.01 Added error handling. Added circular-include check. +// 2.01 -> 2.10 Added raw memory error handling and SMALLINT +// 2.10 -> 3.00 Added memory bank functionality +// Added file I/O operations +// + +#include "mbed.h" +#include "ownet.h" +#include "./Headers/ds2480.h" + +//--------------------------------------------------------------------------- +// Attempt to acquire a 1-Wire net using a com port and a DS2480 based +// adapter. +// +// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to +// OpenCOM to indicate the port number. +// 'port_zstr' - zero terminated port name. For this platform +// use format COMX where X is the port number. +// +// Returns: TRUE - success, COM port opened +// +// exportable functions defined in ownetu.c +SMALLINT owAcquire(int portnum, char *port_zstr) +{ + // attempt to open the communications port + if (OpenCOM(portnum,port_zstr) < 0) + { + OWERROR(OWERROR_OPENCOM_FAILED); + return FALSE; + } + + // detect DS2480 + if (!DS2480Detect(portnum)) + { + CloseCOM(portnum); + OWERROR(OWERROR_DS2480_NOT_DETECTED); + return FALSE; + } + + return TRUE; +} + +//--------------------------------------------------------------------------- +// Attempt to acquire a 1-Wire net using a com port and a DS2480 based +// adapter. +// +// 'port_zstr' - zero terminated port name. For this platform +// use format COMX where X is the port number. +// +// Returns: valid handle, or -1 if an error occurred +// +// exportable functions defined in ownetu.c +// +int owAcquireEx(char *port_zstr) +{ + int portnum; + + // attempt to open the communications port + if ((portnum = OpenCOMEx(port_zstr)) < 0) + { + OWERROR(OWERROR_OPENCOM_FAILED); + return -1; + } + + // detect DS2480 + if (!DS2480Detect(portnum)) + { + CloseCOM(portnum); + OWERROR(OWERROR_DS2480_NOT_DETECTED); + return -1; + } + + return portnum; +} + +//--------------------------------------------------------------------------- +// Release the previously acquired a 1-Wire net. +// +// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to +// OpenCOM to indicate the port number. +// +void owRelease(int portnum) +{ + CloseCOM(portnum); +}