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

Dependencies:   mbed

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);
+}