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a81787f6 | 1 | ## |
50bd5d25 | 2 | ## This file is part of the libsigrokdecode project. |
a81787f6 IJ |
3 | ## |
4 | ## Copyright (C) 2012 Iztok Jeras <iztok.jeras@gmail.com> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
4539e9ca | 17 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. |
a81787f6 IJ |
18 | ## |
19 | ||
a81787f6 IJ |
20 | import sigrokdecode as srd |
21 | ||
c07cbb92 | 22 | # Dictionary of FUNCTION commands and their names. |
758d2ea9 | 23 | command = { |
c07cbb92 UH |
24 | # Scratchpad |
25 | 0x4e: 'Write scratchpad', | |
26 | 0xbe: 'Read scratchpad', | |
27 | 0x48: 'Copy scratchpad', | |
28 | # Thermometer | |
29 | 0x44: 'Convert temperature', | |
30 | 0xb4: 'Read power mode', | |
31 | 0xb8: 'Recall EEPROM', | |
32 | 0xf5: 'PIO access read', | |
33 | 0xA5: 'PIO access write', | |
34 | 0x99: 'Chain', | |
758d2ea9 | 35 | } |
a81787f6 IJ |
36 | |
37 | class Decoder(srd.Decoder): | |
b197383c | 38 | api_version = 3 |
0c931451 | 39 | id = 'ds28ea00' |
9e1437a0 | 40 | name = 'DS28EA00' |
0afa64ae | 41 | longname = 'Maxim DS28EA00 1-Wire digital thermometer' |
9e1437a0 | 42 | desc = '1-Wire digital thermometer with Sequence Detect and PIO.' |
a81787f6 IJ |
43 | license = 'gplv2+' |
44 | inputs = ['onewire_network'] | |
6cbba91f | 45 | outputs = [] |
d6d8a8a4 | 46 | tags = ['IC', 'Sensor'] |
da9bcbd9 BV |
47 | annotations = ( |
48 | ('text', 'Human-readable text'), | |
49 | ) | |
a81787f6 | 50 | |
92b7b49f | 51 | def __init__(self): |
10aeb8ea GS |
52 | self.reset() |
53 | ||
54 | def reset(self): | |
a81787f6 IJ |
55 | self.trn_beg = 0 |
56 | self.trn_end = 0 | |
c07cbb92 UH |
57 | self.state = 'ROM' |
58 | self.rom = 0x0000000000000000 | |
a81787f6 | 59 | |
8915b346 | 60 | def start(self): |
be465111 | 61 | self.out_ann = self.register(srd.OUTPUT_ANN) |
a81787f6 | 62 | |
500560a1 UH |
63 | def putx(self, data): |
64 | self.put(self.ss, self.es, self.out_ann, data) | |
65 | ||
a81787f6 | 66 | def decode(self, ss, es, data): |
c07cbb92 | 67 | code, val = data |
a81787f6 | 68 | |
500560a1 UH |
69 | self.ss, self.es = ss, es |
70 | ||
a81787f6 | 71 | # State machine. |
c07cbb92 | 72 | if code == 'RESET/PRESENCE': |
500560a1 UH |
73 | self.putx([0, ['Reset/presence: %s' |
74 | % ('true' if val else 'false')]]) | |
c07cbb92 UH |
75 | self.state = 'ROM' |
76 | elif code == 'ROM': | |
a81787f6 | 77 | self.rom = val |
500560a1 | 78 | self.putx([0, ['ROM: 0x%016x' % (val)]]) |
c07cbb92 UH |
79 | self.state = 'COMMAND' |
80 | elif code == 'DATA': | |
81 | if self.state == 'COMMAND': | |
500560a1 UH |
82 | if val not in command: |
83 | self.putx([0, ['Unrecognized command: 0x%02x' % val]]) | |
84 | return | |
85 | self.putx([0, ['Function command: 0x%02x \'%s\'' | |
86 | % (val, command[val])]]) | |
87 | self.state = command[val].upper() | |
c07cbb92 | 88 | elif self.state == 'READ SCRATCHPAD': |
500560a1 | 89 | self.putx([0, ['Scratchpad data: 0x%02x' % val]]) |
c07cbb92 | 90 | elif self.state == 'CONVERT TEMPERATURE': |
500560a1 | 91 | self.putx([0, ['Temperature conversion status: 0x%02x' % val]]) |
c07cbb92 | 92 | elif self.state in [s.upper() for s in command.values()]: |
500560a1 | 93 | self.putx([0, ['TODO \'%s\': 0x%02x' % (self.state, val)]]) |