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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
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 | |
17 | ## along with this program; if not, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
21 | # Maxim DS28EA00 protocol decoder | |
22 | ||
23 | import sigrokdecode as srd | |
24 | ||
25 | # Dictionary of FUNCTION commands and their names. | |
26 | command = { | |
27 | # Scratchpad | |
28 | 0x4e: 'Write scratchpad', | |
29 | 0xbe: 'Read scratchpad', | |
30 | 0x48: 'Copy scratchpad', | |
31 | # Thermometer | |
32 | 0x44: 'Convert temperature', | |
33 | 0xb4: 'Read power mode', | |
34 | 0xb8: 'Recall EEPROM', | |
35 | 0xf5: 'PIO access read', | |
36 | 0xA5: 'PIO access write', | |
37 | 0x99: 'Chain', | |
38 | } | |
39 | ||
40 | class Decoder(srd.Decoder): | |
41 | api_version = 1 | |
42 | id = 'maxim_ds28ea00' | |
43 | name = 'DS28EA00' | |
44 | longname = 'Maxim DS28EA00 1-Wire digital thermometer' | |
45 | desc = '1-Wire digital thermometer with Sequence Detect and PIO.' | |
46 | license = 'gplv2+' | |
47 | inputs = ['onewire_network'] | |
48 | outputs = ['maxim_ds28ea00'] | |
49 | probes = [] | |
50 | optional_probes = [ | |
51 | {'id': 'pioa', 'name': 'PIOA/DONE#', | |
52 | 'desc': 'PIOA channel and chain output'}, | |
53 | {'id': 'piob', 'name': 'PIOB/EN#', | |
54 | 'desc': 'PIOB channel and chain output'}, | |
55 | ] | |
56 | options = {} | |
57 | annotations = [ | |
58 | ['Text', 'Human-readable text'], | |
59 | ] | |
60 | ||
61 | def __init__(self, **kwargs): | |
62 | self.trn_beg = 0 | |
63 | self.trn_end = 0 | |
64 | self.state = 'ROM' | |
65 | self.rom = 0x0000000000000000 | |
66 | ||
67 | def start(self): | |
68 | self.out_ann = self.add(srd.OUTPUT_ANN, 'maxim_ds28ea00') | |
69 | ||
70 | def report(self): | |
71 | pass | |
72 | ||
73 | def putx(self, data): | |
74 | self.put(self.ss, self.es, self.out_ann, data) | |
75 | ||
76 | def decode(self, ss, es, data): | |
77 | code, val = data | |
78 | ||
79 | self.ss, self.es = ss, es | |
80 | ||
81 | # State machine. | |
82 | if code == 'RESET/PRESENCE': | |
83 | self.putx([0, ['Reset/presence: %s' | |
84 | % ('true' if val else 'false')]]) | |
85 | self.state = 'ROM' | |
86 | elif code == 'ROM': | |
87 | self.rom = val | |
88 | self.putx([0, ['ROM: 0x%016x' % (val)]]) | |
89 | self.state = 'COMMAND' | |
90 | elif code == 'DATA': | |
91 | if self.state == 'COMMAND': | |
92 | if val not in command: | |
93 | self.putx([0, ['Unrecognized command: 0x%02x' % val]]) | |
94 | return | |
95 | self.putx([0, ['Function command: 0x%02x \'%s\'' | |
96 | % (val, command[val])]]) | |
97 | self.state = command[val].upper() | |
98 | elif self.state == 'READ SCRATCHPAD': | |
99 | self.putx([0, ['Scratchpad data: 0x%02x' % val]]) | |
100 | elif self.state == 'CONVERT TEMPERATURE': | |
101 | self.putx([0, ['Temperature conversion status: 0x%02x' % val]]) | |
102 | elif self.state in [s.upper() for s in command.values()]: | |
103 | self.putx([0, ['TODO \'%s\': 0x%02x' % (self.state, val)]]) | |
104 | else: | |
105 | raise Exception('Invalid state: %s' % self.state) | |
106 |