| User | Revision | Line number | New contents of line |
|---|
| svlach |
0:70c3bea805ee
|
1
|
//---------------------------------------------------------------------------
|
| svlach |
0:70c3bea805ee
|
2
|
// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
|
| svlach |
0:70c3bea805ee
|
3
|
//
|
| svlach |
0:70c3bea805ee
|
4
|
// Permission is hereby granted, free of charge, to any person obtaining a
|
| svlach |
0:70c3bea805ee
|
5
|
// copy of this software and associated documentation files (the "Software"),
|
| svlach |
0:70c3bea805ee
|
6
|
// to deal in the Software without restriction, including without limitation
|
| svlach |
0:70c3bea805ee
|
7
|
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
| svlach |
0:70c3bea805ee
|
8
|
// and/or sell copies of the Software, and to permit persons to whom the
|
| svlach |
0:70c3bea805ee
|
9
|
// Software is furnished to do so, subject to the following conditions:
|
| svlach |
0:70c3bea805ee
|
10
|
//
|
| svlach |
0:70c3bea805ee
|
11
|
// The above copyright notice and this permission notice shall be included
|
| svlach |
0:70c3bea805ee
|
12
|
// in all copies or substantial portions of the Software.
|
| svlach |
0:70c3bea805ee
|
13
|
//
|
| svlach |
0:70c3bea805ee
|
14
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
| svlach |
0:70c3bea805ee
|
15
|
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
| svlach |
0:70c3bea805ee
|
16
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
| svlach |
0:70c3bea805ee
|
17
|
// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
|
| svlach |
0:70c3bea805ee
|
18
|
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
| svlach |
0:70c3bea805ee
|
19
|
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
| svlach |
0:70c3bea805ee
|
20
|
// OTHER DEALINGS IN THE SOFTWARE.
|
| svlach |
0:70c3bea805ee
|
21
|
//
|
| svlach |
0:70c3bea805ee
|
22
|
// Except as contained in this notice, the name of Dallas Semiconductor
|
| svlach |
0:70c3bea805ee
|
23
|
// shall not be used except as stated in the Dallas Semiconductor
|
| svlach |
0:70c3bea805ee
|
24
|
// Branding Policy.
|
| svlach |
0:70c3bea805ee
|
25
|
// ---------------------------------------------------------------------------
|
| svlach |
0:70c3bea805ee
|
26
|
//
|
| svlach |
0:70c3bea805ee
|
27
|
// temp10.C - Module to read the DS1920/DS1820 - temperature measurement.
|
| svlach |
0:70c3bea805ee
|
28
|
//
|
| svlach |
0:70c3bea805ee
|
29
|
// Version: 2.00
|
| svlach |
0:70c3bea805ee
|
30
|
//
|
| svlach |
0:70c3bea805ee
|
31
|
// ---------------------------------------------------------------------------
|
| svlach |
0:70c3bea805ee
|
32
|
//
|
| svlach |
0:70c3bea805ee
|
33
|
//
|
| svlach |
1:dcf2f8359398
|
34
|
#include "ownet.h"
|
| svlach |
0:70c3bea805ee
|
35
|
#include "./Headers/readDS1920.h"
|
| svlach |
0:70c3bea805ee
|
36
|
|
| svlach |
0:70c3bea805ee
|
37
|
//----------------------------------------------------------------------
|
| svlach |
0:70c3bea805ee
|
38
|
// Read the temperature of a DS1920/DS1820
|
| svlach |
0:70c3bea805ee
|
39
|
//
|
| svlach |
0:70c3bea805ee
|
40
|
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
|
| svlach |
0:70c3bea805ee
|
41
|
// OpenCOM to indicate the port number.
|
| svlach |
0:70c3bea805ee
|
42
|
// 'SerialNum' - Serial Number of DS1920/DS1820 to read temperature from
|
| svlach |
0:70c3bea805ee
|
43
|
// 'Temp ' - pointer to variable where that temperature will be
|
| svlach |
0:70c3bea805ee
|
44
|
// returned
|
| svlach |
0:70c3bea805ee
|
45
|
//
|
| svlach |
0:70c3bea805ee
|
46
|
// Returns: TRUE(1) temperature has been read and verified
|
| svlach |
0:70c3bea805ee
|
47
|
// FALSE(0) could not read the temperature, perhaps device is not
|
| svlach |
0:70c3bea805ee
|
48
|
// in contact
|
| svlach |
0:70c3bea805ee
|
49
|
//
|
| svlach |
0:70c3bea805ee
|
50
|
|
| svlach |
0:70c3bea805ee
|
51
|
|
| svlach |
0:70c3bea805ee
|
52
|
int ReadTemperature(int portnum, uchar *SerialNum, float *Temp)
|
| svlach |
0:70c3bea805ee
|
53
|
{
|
| svlach |
0:70c3bea805ee
|
54
|
uchar rt=FALSE;
|
| svlach |
0:70c3bea805ee
|
55
|
uchar send_block[30],lastcrc8;
|
| svlach |
0:70c3bea805ee
|
56
|
int send_cnt, tsht, i, loop=0;
|
| svlach |
0:70c3bea805ee
|
57
|
float tmp,cr,cpc;
|
| svlach |
0:70c3bea805ee
|
58
|
|
| svlach |
0:70c3bea805ee
|
59
|
// set the device serial number to the counter device
|
| svlach |
0:70c3bea805ee
|
60
|
owSerialNum(portnum,SerialNum,FALSE);
|
| svlach |
0:70c3bea805ee
|
61
|
|
| svlach |
0:70c3bea805ee
|
62
|
for (loop = 0; loop < 2; loop ++)
|
| svlach |
0:70c3bea805ee
|
63
|
{
|
| svlach |
0:70c3bea805ee
|
64
|
// access the device
|
| svlach |
0:70c3bea805ee
|
65
|
if (owAccess(portnum))
|
| svlach |
0:70c3bea805ee
|
66
|
{
|
| svlach |
0:70c3bea805ee
|
67
|
// send the convert command and start power delivery
|
| svlach |
0:70c3bea805ee
|
68
|
if (!owWriteBytePower(portnum,0x44))
|
| svlach |
0:70c3bea805ee
|
69
|
return FALSE;
|
| svlach |
0:70c3bea805ee
|
70
|
|
| svlach |
0:70c3bea805ee
|
71
|
// sleep for 1 second
|
| svlach |
0:70c3bea805ee
|
72
|
msDelay(1000);
|
| svlach |
0:70c3bea805ee
|
73
|
|
| svlach |
0:70c3bea805ee
|
74
|
// turn off the 1-Wire Net strong pull-up
|
| svlach |
0:70c3bea805ee
|
75
|
if (owLevel(portnum,MODE_NORMAL) != MODE_NORMAL)
|
| svlach |
0:70c3bea805ee
|
76
|
return FALSE;
|
| svlach |
0:70c3bea805ee
|
77
|
|
| svlach |
0:70c3bea805ee
|
78
|
// access the device
|
| svlach |
0:70c3bea805ee
|
79
|
if (owAccess(portnum))
|
| svlach |
0:70c3bea805ee
|
80
|
{
|
| svlach |
0:70c3bea805ee
|
81
|
// create a block to send that reads the temperature
|
| svlach |
0:70c3bea805ee
|
82
|
// read scratchpad command
|
| svlach |
0:70c3bea805ee
|
83
|
send_cnt = 0;
|
| svlach |
0:70c3bea805ee
|
84
|
send_block[send_cnt++] = 0xBE;
|
| svlach |
0:70c3bea805ee
|
85
|
// now add the read bytes for data bytes and crc8
|
| svlach |
0:70c3bea805ee
|
86
|
for (i = 0; i < 9; i++)
|
| svlach |
0:70c3bea805ee
|
87
|
send_block[send_cnt++] = 0xFF;
|
| svlach |
0:70c3bea805ee
|
88
|
|
| svlach |
0:70c3bea805ee
|
89
|
// now send the block
|
| svlach |
0:70c3bea805ee
|
90
|
if (owBlock(portnum,FALSE,send_block,send_cnt))
|
| svlach |
0:70c3bea805ee
|
91
|
{
|
| svlach |
0:70c3bea805ee
|
92
|
// initialize the CRC8
|
| svlach |
0:70c3bea805ee
|
93
|
setcrc8(portnum,0);
|
| svlach |
0:70c3bea805ee
|
94
|
// perform the CRC8 on the last 8 bytes of packet
|
| svlach |
0:70c3bea805ee
|
95
|
for (i = send_cnt - 9; i < send_cnt; i++)
|
| svlach |
0:70c3bea805ee
|
96
|
lastcrc8 = docrc8(portnum,send_block[i]);
|
| svlach |
0:70c3bea805ee
|
97
|
|
| svlach |
0:70c3bea805ee
|
98
|
// verify CRC8 is correct
|
| svlach |
0:70c3bea805ee
|
99
|
if (lastcrc8 == 0x00)
|
| svlach |
0:70c3bea805ee
|
100
|
{
|
| svlach |
0:70c3bea805ee
|
101
|
// calculate the high-res temperature
|
| svlach |
0:70c3bea805ee
|
102
|
tsht = send_block[1]/2;
|
| svlach |
0:70c3bea805ee
|
103
|
if (send_block[2] & 0x01)
|
| svlach |
0:70c3bea805ee
|
104
|
tsht |= -128;
|
| svlach |
0:70c3bea805ee
|
105
|
tmp = (float)(tsht);
|
| svlach |
0:70c3bea805ee
|
106
|
cr = send_block[7];
|
| svlach |
0:70c3bea805ee
|
107
|
cpc = send_block[8];
|
| svlach |
0:70c3bea805ee
|
108
|
if (((cpc - cr) == 1) && (loop == 0))
|
| svlach |
0:70c3bea805ee
|
109
|
continue;
|
| svlach |
0:70c3bea805ee
|
110
|
if (cpc == 0)
|
| svlach |
0:70c3bea805ee
|
111
|
return FALSE;
|
| svlach |
0:70c3bea805ee
|
112
|
else
|
| svlach |
0:70c3bea805ee
|
113
|
tmp = tmp - (float)0.25 + (cpc - cr)/cpc;
|
| svlach |
0:70c3bea805ee
|
114
|
|
| svlach |
0:70c3bea805ee
|
115
|
*Temp = tmp;
|
| svlach |
0:70c3bea805ee
|
116
|
// success
|
| svlach |
0:70c3bea805ee
|
117
|
rt = TRUE;
|
| svlach |
0:70c3bea805ee
|
118
|
break;
|
| svlach |
0:70c3bea805ee
|
119
|
}
|
| svlach |
0:70c3bea805ee
|
120
|
}
|
| svlach |
0:70c3bea805ee
|
121
|
}
|
| svlach |
0:70c3bea805ee
|
122
|
}
|
| svlach |
0:70c3bea805ee
|
123
|
|
| svlach |
0:70c3bea805ee
|
124
|
}
|
| svlach |
0:70c3bea805ee
|
125
|
|
| svlach |
0:70c3bea805ee
|
126
|
// return the result flag rt
|
| svlach |
0:70c3bea805ee
|
127
|
return rt;
|
| svlach |
0:70c3bea805ee
|
128
|
}
|
Steven Vlach