annotate 1wire.c @ 82:93388163e037 default tip

Fix 'none' mode.
author Daniel O'Connor <darius@dons.net.au>
date Mon, 01 Apr 2013 23:39:25 +1030
parents 4abce5954d25
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
1 /*
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
2 * Various 1 wire routines
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
3 * Search routine is copied from the Dallas owpd library with mods
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
4 * available from here http://www.ibutton.com/software/1wire/wirekit.html
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
5 *
8
f9a085a0ba93 Change the 1 wire routines to mostly C with assembly delay routines
darius
parents: 0
diff changeset
6 * $Id$
f9a085a0ba93 Change the 1 wire routines to mostly C with assembly delay routines
darius
parents: 0
diff changeset
7 *
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
8 * Copyright (c) 2004
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
9 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
10 *
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
11 * Redistribution and use in source and binary forms, with or without
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
12 * modification, are permitted provided that the following conditions
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
13 * are met:
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
14 * 1. Redistributions of source code must retain the above copyright
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
15 * notice, this list of conditions and the following disclaimer.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
16 * 2. Redistributions in binary form must reproduce the above copyright
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
17 * notice, this list of conditions and the following disclaimer in the
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
18 * documentation and/or other materials provided with the distribution.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
19 *
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
20 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
23 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
30 * SUCH DAMAGE.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
31 */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
32
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
33 /*
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
34 * No user servicable parts inside
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
35 *
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
36 * Modify 1wire-config.h
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
37 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
38
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
39 #include <stdio.h>
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
40 #include <avr/io.h>
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
41 #include <avr/pgmspace.h>
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
42 #include <util/delay.h>
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
43 #include "1wire.h"
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
44 #include "1wire-config.h"
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
45 #include "cons.h"
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
46
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
47 static uint8_t OW_LastDevice = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
48 static uint8_t OW_LastDiscrepancy = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
49 static uint8_t OW_LastFamilyDiscrepancy = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
50
45
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
51 const PROGMEM char *OWProgROM_Status[] = {
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
52 "OK",
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
53 "not possible (no HW support)",
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
54 "Invalid parameters",
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
55 "module doesn't exist or didn't respond properly"
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
56 };
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
57
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
58 /*-----------------------------------------------------------------------------
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
59 * Configure the IO port as we need
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
60 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
61 void
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
62 OWInit(void) {
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
63 OWBUSINIT();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
64 OWSETBUSHIGH();
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
65 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
66
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
67 /*-----------------------------------------------------------------------------
22
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
68 * Generate a 1-Wire reset, return 0 if presence pulse was found, 1 if it
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
69 * wasn't, or 2 if the line appears to be being held low.
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
70 *
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
71 * (NOTE: Does not handle alarm presence from DS2404/DS1994)
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
72 */
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
73 uint8_t
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
74 OWTouchReset(void) {
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
75 OWDELAY_G;
22
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
76
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
77 /* Check the bus isn't being held low (ie it's broken) Do it after
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
78 * the delay so we guarantee we don't see a slave from a previous
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
79 * comms attempt
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
80 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
81 if(OWREADBUS() == 0)
22
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
82 return 2;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
83
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
84 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
85 OWDELAY_H;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
86 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
87 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
88
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
89 return(OWREADBUS());
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
90 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
91
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
92 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
93 * Send a 1-wire write bit.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
94 */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
95 void
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
96 OWWriteBit(uint8_t bit) {
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
97 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
98
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
99 if (bit) {
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
100 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
101 OWDELAY_A;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
102 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
103 OWDELAY_B;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
104 } else {
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
105 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
106 OWDELAY_C;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
107 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
108 OWDELAY_D;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
109 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
110 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
111
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
112 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
113 * Read a bit from the 1-wire bus and return it.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
114 */
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
115 uint8_t
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
116 OWReadBit(void) {
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
117 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
118
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
119 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
120 OWDELAY_A;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
121 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
122 OWDELAY_E;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
123 return(OWREADBUS());
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
124 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
125
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
126 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
127 * Write a byte to the 1-wire bus
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
128 */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
129 void
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
130 OWWriteByte(uint8_t data) {
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
131 uint8_t i;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
132
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
133 /* Send LSB first */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
134 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
135 OWWriteBit(data & 0x01);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
136 data >>= 1;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
137 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
138 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
139
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
140 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
141 * Read a byte from the 1-wire bus
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
142 */
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
143 uint8_t
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
144 OWReadByte(void) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
145 int i, result = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
146
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
147 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
148 result >>= 1;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
149 if (OWReadBit())
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
150 result |= 0x80;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
151 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
152 return(result);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
153 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
154
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
155 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
156 * Write a 1-wire data byte and return the sampled result.
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
157 */
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
158 uint8_t
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
159 OWTouchByte(uint8_t data) {
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
160 uint8_t i, result = 0;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
161
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
162 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
163 result >>= 1;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
164
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
165 /* If sending a 1 then read a bit, otherwise write a 0 */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
166 if (data & 0x01) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
167 if (OWReadBit())
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
168 result |= 0x80;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
169 } else
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
170 OWWriteBit(0);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
171
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
172 data >>= 1;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
173 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
174
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
175 return(result);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
176 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
177
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
178 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
179 * Write a block of bytes to the 1-wire bus and return the sampled result in
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
180 * the same buffer
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
181 */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
182 void
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
183 OWBlock(uint8_t *data, int len) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
184 int i;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
185
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
186 for (i = 0; i < len; i++)
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
187 data[i] = OWTouchByte(data[i]);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
188 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
189
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
190
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
191 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
192 * Send a 1 wire command to a device, or all if no ROM ID provided
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
193 */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
194 void
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
195 OWSendCmd(uint8_t *ROM, uint8_t cmd) {
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
196 uint8_t i;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
197
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
198 OWTouchReset();
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
199
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
200 if (ROM == NULL)
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
201 OWWriteByte(OW_SKIP_ROM_CMD);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
202 else {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
203 OWWriteByte(OW_MATCH_ROM_CMD);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
204 for (i = 0; i < 8; i++)
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
205 OWWriteByte(ROM[i]);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
206 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
207 OWWriteByte(cmd);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
208 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
209
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
210 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
211 * Search algorithm from App note 187 (and 162)
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
212 *
10
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
213 * OWFirst/OWNext return..
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
214 * 1 when something is found,
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
215 * 0 no more modules
16
026dc24d85e0 Spell presence correctly.
darius
parents: 12
diff changeset
216 * -1 if no presence pulse,
10
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
217 * -2 if bad CRC,
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
218 * -3 if bad wiring.
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
219 */
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
220 uint8_t
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
221 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
222 /* Reset state */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
223 OW_LastDiscrepancy = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
224 OW_LastDevice = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
225 OW_LastFamilyDiscrepancy = 0;
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
226
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
227 /* Go looking */
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
228 return (OWNext(ROM, do_reset, alarm_only));
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
229 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
230
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
231 /* Returns 1 when something is found, 0 if nothing left */
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
232 uint8_t
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
233 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
234 uint8_t bit_test, search_direction, bit_number;
10
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
235 uint8_t last_zero, rom_byte_number, rom_byte_mask;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
236 uint8_t lastcrc8, crcaccum;
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
237 int8_t next_result;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
238
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
239 /* Init for search */
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
240 bit_number = 1;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
241 last_zero = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
242 rom_byte_number = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
243 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
244 next_result = OW_NOMODULES;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
245 lastcrc8 = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
246 crcaccum = 0;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
247
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
248 /* if the last call was not the last one */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
249 if (!OW_LastDevice) {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
250 /* check if reset first is requested */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
251 if (do_reset) {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
252 /* reset the 1-wire
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
253 * if there are no parts on 1-wire, return 0 */
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
254 OWPUTSP(PSTR("Resetting\r\n"));
22
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
255 switch (OWTouchReset()) {
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
256 case 0:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
257 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
258
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
259 case 1:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
260 /* reset the search */
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
261 OW_LastDiscrepancy = 0;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
262 OW_LastFamilyDiscrepancy = 0;
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
263 OWPUTSP(PSTR("No devices on bus\r\n"));
22
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
264 return OW_NOPRESENCE;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
265 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
266
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
267 case 2:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
268 /* reset the search */
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
269 OW_LastDiscrepancy = 0;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
270 OW_LastFamilyDiscrepancy = 0;
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
271 OWPUTSP(PSTR("Bus appears to be being held low\r\n"));
22
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
272 return OW_BADWIRE;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
273 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
darius
parents: 21
diff changeset
274
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
275 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
276 }
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
277
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
278 /* If finding alarming devices issue a different command */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
279 if (alarm_only)
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
280 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
281 else
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
282 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
283
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
284 /* pause before beginning the search */
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
285 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
286 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
287 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
darius
parents: 29
diff changeset
288
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
289 /* loop to do the search */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
290 do {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
291 /* read a bit and its compliment */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
292 bit_test = OWReadBit() << 1;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
293 bit_test |= OWReadBit();
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
294
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
295 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test);
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
296
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
297 /* check for no devices on 1-wire */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
298 if (bit_test == 3) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
299 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test);
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
300 return(OW_BADWIRE);
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
301 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
302 else {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
303 /* all devices coupled have 0 or 1 */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
304 if (bit_test > 0)
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
305 search_direction = !(bit_test & 0x01); /* bit write value for search */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
306 else {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
307 /* if this discrepancy is before the Last Discrepancy
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
308 * on a previous OWNext then pick the same as last time */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
309 if (bit_number < OW_LastDiscrepancy)
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
310 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
311 else
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
312 /* if equal to last pick 1, if not then pick 0 */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
313 search_direction = (bit_number == OW_LastDiscrepancy);
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
314
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
315 /* if 0 was picked then record its position in LastZero */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
316 if (search_direction == 0) {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
317 last_zero = bit_number;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
318
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
319 /* check for Last discrepancy in family */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
320 if (last_zero < 9)
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
321 OW_LastFamilyDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
322 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
323 }
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
324
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
325 /* set or clear the bit in the ROM byte rom_byte_number
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
326 * with mask rom_byte_mask */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
327 if (search_direction == 1)
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
328 ROM[rom_byte_number] |= rom_byte_mask;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
329 else
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
330 ROM[rom_byte_number] &= ~rom_byte_mask;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
331
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
332 /* serial number search direction write bit */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
333 OWWriteBit(search_direction);
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
334
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
335 /* increment the byte counter bit_number
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
336 * and shift the mask rom_byte_mask */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
337 bit_number++;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
338 rom_byte_mask <<= 1;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
339
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
340 /* if the mask is 0 then go to new ROM byte rom_byte_number
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
341 * and reset mask */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
342 if (rom_byte_mask == 0) {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
343 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
344 lastcrc8 = crcaccum;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
345
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
346 rom_byte_number++;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
347 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
348 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
349 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
350 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
351
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
352 /* if the search was successful then */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
353 if (!(bit_number < 65) || lastcrc8) {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
354 if (lastcrc8) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
355 OWPRINTFP(PSTR("Bad CRC (%d)\r\n"), lastcrc8);
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
356 next_result = OW_BADCRC;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
357 } else {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
358 /* search successful so set LastDiscrepancy,LastDevice,next_result */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
359 OW_LastDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
360 OW_LastDevice = (OW_LastDiscrepancy == 0);
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
361 OWPRINTFP(PSTR("Last device = %d\r\n"), OW_LastDevice);
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
362 next_result = OW_FOUND;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
363 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
364 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
365 }
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
366
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
367 /* if no device found then reset counters so next 'next' will be
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
368 * like a first */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
369 if (next_result != OW_FOUND || ROM[0] == 0) {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
370 OW_LastDiscrepancy = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
371 OW_LastDevice = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
372 OW_LastFamilyDiscrepancy = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
373 }
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
374
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
375 if (next_result == OW_FOUND && ROM[0] == 0x00)
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
376 next_result = OW_BADWIRE;
10
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
377
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
378 return next_result;
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
379
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
380 }
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
381
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
382 uint8_t PROGMEM dscrc_table[] = {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
383 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
384 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
385 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
386 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
387 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
388 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
389 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
390 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
391 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
392 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
393 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
394 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
395 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
396 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
397 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
398 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
399 };
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
400
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
401 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
402 * Update *crc based on the value of x
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
403 */
0
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
404 void
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
405 OWCRC(uint8_t x, uint8_t *crc) {
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
406 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]);
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
407 }
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
408
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
409 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
410 * Program a DS2502's memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
411 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
412 * Arguments
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
413 * ROM - ROM ID (or NULL to send SKIP_ROM)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
414 * start - Start address (bytes)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
415 * len - Length of data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
416 * data - Data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
417 * exact - If true, only accept exact matches for programming,
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
418 * otherwise only ensure the bits we requested were
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
419 * programmed [to 0]
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
420 * status - If true program status rather than memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
421 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
422 * Returns..
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
423 * 0 if all is OK
45
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
424 * 1 if the programming is not possible
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
425 * 2 if the parameters were invalid
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
426 * 3 if the DS2502 didn't respond appropriately (also happens if the
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
427 * module doesn't exist)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
428 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
429 uint8_t
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
430 OWProgROM(uint8_t *ROM, uint8_t start, uint8_t len, uint8_t *data, uint8_t exact, uint8_t status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
431 #if defined(OWSETVPPON) && defined(OWSETVPPOFF)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
432 uint8_t crc, i, tmp;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
433
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
434 /* Stupid programmer detection */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
435 if (status) {
45
efd44dc40934 Add macros for number system used for temperatures.
darius@Inchoate
parents: 41
diff changeset
436 if (start + len > 3)
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
437 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
438 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
439 if (start + len > 127)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
440 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
441 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
442
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
443 if (len < 1)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
444 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
445
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
446 OWDELAY_I;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
447 if (OWTouchReset() != 0) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
448 cons_putsP(PSTR("No presence pulse\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
449 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
450 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
451
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
452 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
453
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
454 /* Send the command */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
455 if (status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
456 OWSendCmd(ROM, OW_WRITE_STATUS);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
457 OWCRC(OW_WRITE_STATUS, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
458 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
459 OWSendCmd(ROM, OW_WRITE_MEMORY);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
460 OWCRC(OW_WRITE_MEMORY, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
461 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
462
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
463 /* And the start address
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
464 * (2 bytes even though one would do)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
465 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
466 OWWriteByte(start);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
467 OWCRC(start, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
468
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
469 OWWriteByte(0x00);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
470 OWCRC(0x00, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
471
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
472 for (i = 0; i < len; i++) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
473 cons_putsP(PSTR("Programming "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
474 cons_puts_hex(data[i]);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
475 cons_putsP(PSTR(" to "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
476 cons_puts_hex(start + i);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
477 cons_putsP(PSTR("\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
478
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
479 OWWriteByte(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
480 OWCRC(data[i], &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
481
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
482 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
483
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
484 if (crc != tmp) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
485 cons_putsP(PSTR("CRC mismatch "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
486 cons_puts_hex(crc);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
487 cons_putsP(PSTR(" vs "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
488 cons_puts_hex(tmp);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
489 cons_putsP(PSTR("\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
490
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
491 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
492 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
493 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
494
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
495 OWSETVPPON();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
496 OWDELAY_H;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
497 OWSETVPPOFF();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
498
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
499 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
500
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
501 /* Check the bits we turned off are off */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
502 /*
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
503 for (i = 0; i < 8; i++)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
504 if (!(data[i] & 1 << i) && (tmp & 1 << i))
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
505 return(-3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
506 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
507 if ((!data[i] & tmp) != 0) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
508 cons_putsP(PSTR("Readback mismatch "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
509 cons_puts_hex(data[i]);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
510 cons_putsP(PSTR(" vs "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
511 cons_puts_hex(data[i]);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
512 cons_putsP(PSTR("\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
513
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
514 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
515 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
516 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
517
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
518 /* The DS2502 loads it's CRC register with the address of the
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
519 * next byte */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
520 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
521 OWCRC(start + i + 1, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
522 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
523
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
524 return(0);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
525 #else
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
526 return(1);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
527 #endif
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
528 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
529
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
530 /*
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
531 * OWGetTemp
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
532 *
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
533 * Get the temperature from a 1wire bus module
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
534 *
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
535 * Returns temperature in hundredths of a degree or OW_TEMP_xxx on
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
536 * error.
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
537 */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
538 int16_t
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
539 OWGetTemp(uint8_t *ROM) {
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
540 int8_t i;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
541 uint8_t crc, buf[9];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
542 int16_t temp;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
543 int16_t tfrac;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
544
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
545 if (ROM[0] != OW_FAMILY_TEMP)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
546 return OW_TEMP_WRONG_FAM;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
547
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
548 OWSendCmd(ROM, OW_CONVERTT_CMD);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
549
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
550 i = 0;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
551
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
552 /* Wait for the conversion */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
553 while (OWReadBit() == 0)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
554 i = 1;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
555
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
556 /* Check that we talked to a module and it did something */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
557 if (i == 0) {
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
558 return OW_TEMP_NO_ROM;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
559 }
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
560
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
561 OWSendCmd(ROM, OW_RD_SCR_CMD);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
562 crc = 0;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
563 for (i = 0; i < 8; i++) {
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
564 buf[i] = OWReadByte();
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
565 OWCRC(buf[i], &crc);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
566 }
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
567 buf[i] = OWReadByte();
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
568 if (crc != buf[8])
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
569 return OW_TEMP_CRC_ERR;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
570 temp = buf[0];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
571 if (buf[1] & 0x80)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
572 temp -= 256;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
573
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
574 /* Chop off 0.5 degree bit */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
575 temp >>= 1;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
576
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
577 /* Calulate the fractional remainder */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
578 tfrac = buf[7] - buf[6];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
579
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
580 /* Work in 100'th of degreess to save on floats */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
581 tfrac *= (int16_t)100;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
582
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
583 /* Divide by count */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
584 tfrac /= buf[7];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
585
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
586 /* Subtract 0.25 deg from temp */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
587 tfrac += 75;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
588 if (tfrac < 100)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
589 temp--;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
590 else
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
591 tfrac -= 100;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
592
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
593 i = temp;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
594 temp *= 100;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
595 temp += tfrac;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
596
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
597 return(temp);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
598 }
76
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
599
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
600 /*
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
601 * OWTempStatusStr
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
602 *
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
603 * Return a string for each OW_TEMP_xxx error code
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
604 *
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
605 * shrt = 1 returns short strings
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
606 *
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
607 */
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
608 const char *
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
609 OWTempStatusStr(int16_t val, uint8_t shrt) {
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
610 if (val > OW_TEMP_BADVAL) {
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
611 if (shrt)
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
612 return PSTR("OK");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
613 else
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
614 return PSTR("OK");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
615 }
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
616
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
617 switch (val) {
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
618 case OW_TEMP_WRONG_FAM:
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
619 if (shrt)
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
620 return PSTR("WrFam");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
621 else
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
622 return PSTR("Wrong family");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
623 break;
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
624 case OW_TEMP_CRC_ERR:
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
625 if (shrt)
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
626 return PSTR("CRCErr");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
627 else
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
628 return PSTR("CRC Error");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
629 break;
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
630 case OW_TEMP_NO_ROM:
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
631 if (shrt)
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
632 return PSTR("NoROM");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
633 else
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
634 return PSTR("ROM did not reply");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
635 break;
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
636 default:
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
637 if (shrt)
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
638 return PSTR("???");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
639 else
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
640 return PSTR("Unknown error code");
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
641 break;
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
642 }
4abce5954d25 Add a routine to return text versions of errors from the temperature
darius@Inchoate
parents: 45
diff changeset
643 }