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//---------------------------------------------------------------------------
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// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
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// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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// Except as contained in this notice, the name of Dallas Semiconductor
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// shall not be used except as stated in the Dallas Semiconductor
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//---------------------------------------------------------------------------
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// cnt1D.c - Module to read the DS2423 - counter.
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// external One Wire functions from nework layer
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extern SMALLINT owAccess(int);
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extern void owSerialNum(int,uchar *,SMALLINT);
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extern SMALLINT owVerify(int,SMALLINT);
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// external One Wire functions from transaction layer
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extern SMALLINT owBlock(int,SMALLINT,uchar *,SMALLINT);
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// external functions defined in crcutil.c
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extern void setcrc16(int,ushort);
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extern ushort docrc16(int,ushort);
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// exportable functions defined in cnt1d.c
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SMALLINT ReadCounter(int,int,ulong *);
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//----------------------------------------------------------------------
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// Read the counter on a specified page of a DS2423.
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
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// indicate the symbolic port number.
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// 'SerialNum' - Serial Number of DS2423 that contains the counter
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// 'CounterPage' - page number that the counter is associated with
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// 'Count' - pointer to variable where that count will be returned
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// Returns: TRUE(1) counter has been read and verified
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// FALSE(0) could not read the counter, perhaps device is not
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SMALLINT ReadCounter(int portnum, int CounterPage, unsigned long *Count)
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// set the device serial number to the counter device
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/* 2/12/2003 [bcl] DigiTemp does this before calling the routine */
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/* owSerialNum(portnum,SerialNum,FALSE); */
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if (owAccess(portnum))
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// create a block to send that reads the counter
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// read memory and counter command
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send_block[send_cnt++] = 0xA5;
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docrc16(portnum,0xA5);
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// address of last data byte before counter
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address = (CounterPage << 5) + 31; // (1.02)
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send_block[send_cnt++] = (uchar)(address & 0xFF);
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docrc16(portnum,(ushort)(address & 0xFF));
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send_block[send_cnt++] = (uchar)(address >> 8);
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docrc16(portnum,(ushort)(address >> 8));
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// now add the read bytes for data byte,counter,zero bits, crc16
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for (i = 0; i < 11; i++)
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send_block[send_cnt++] = 0xFF;
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if (owBlock(portnum,FALSE,send_block,send_cnt))
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// perform the CRC16 on the last 11 bytes of packet
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for (i = send_cnt - 11; i < send_cnt; i++)
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lastcrc16 = docrc16(portnum,send_block[i]);
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// verify CRC16 is correct
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if (lastcrc16 == 0xB001)
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// extract the counter value
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for (i = send_cnt - 7; i >= send_cnt - 10; i--)
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*Count |= send_block[i];
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// return the result flag rt
added
removed
userial/cnt1d.c
