]>
Commit | Line | Data |
---|---|---|
3f5f3a92 UH |
1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2019 Mariusz Bialonczyk <manio@skyboo.net> | |
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, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | import sigrokdecode as srd | |
21 | ||
22 | # Dictionary of FUNCTION commands and their names. | |
23 | command = { | |
24 | 0xf0: 'Read PIO Registers', | |
25 | 0xf5: 'Channel Access Read', | |
26 | 0x5a: 'Channel Access Write', | |
27 | 0xcc: 'Write Conditional Search Register', | |
28 | 0xc3: 'Reset Activity Latches', | |
29 | 0x3c: 'Disable Test Mode', | |
30 | } | |
31 | ||
32 | class Decoder(srd.Decoder): | |
33 | api_version = 3 | |
34 | id = 'ds2408' | |
35 | name = 'DS2408' | |
36 | longname = 'Maxim DS2408' | |
37 | desc = '1-Wire 8-channel addressable switch.' | |
38 | license = 'gplv2+' | |
39 | inputs = ['onewire_network'] | |
40 | outputs = [] | |
41 | tags = ['Embedded/industrial', 'IC'] | |
42 | annotations = ( | |
43 | ('text', 'Human-readable text'), | |
44 | ) | |
45 | ||
46 | def __init__(self): | |
47 | self.reset() | |
48 | ||
49 | def reset(self): | |
50 | # Bytes for function command. | |
51 | self.bytes = [] | |
52 | ||
53 | def start(self): | |
54 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
55 | ||
56 | def putx(self, data): | |
57 | self.put(self.ss, self.es, self.out_ann, data) | |
58 | ||
59 | def decode(self, ss, es, data): | |
60 | code, val = data | |
61 | ||
62 | if code == 'RESET/PRESENCE': | |
63 | self.ss, self.es = ss, es | |
64 | self.putx([0, ['Reset/presence: %s' | |
65 | % ('true' if val else 'false')]]) | |
66 | self.bytes = [] | |
67 | elif code == 'ROM': | |
68 | self.ss, self.es = ss, es | |
69 | family_code = val & 0xff | |
70 | self.putx([0, ['ROM: 0x%016x (family code 0x%02x)' % (val, family_code)]]) | |
71 | self.bytes = [] | |
72 | elif code == 'DATA': | |
73 | self.bytes.append(val) | |
74 | if 1 == len(self.bytes): | |
75 | self.ss, self.es = ss, es | |
76 | if val not in command: | |
77 | self.putx([0, ['Unrecognized command: 0x%02x' % val]]) | |
78 | else: | |
79 | self.putx([0, ['%s (0x%02x)' % (command[val], val)]]) | |
80 | elif 0xf0 == self.bytes[0]: # Read PIO Registers | |
81 | if 2 == len(self.bytes): | |
82 | self.ss = ss | |
83 | elif 3 == len(self.bytes): | |
84 | self.es = es | |
85 | self.putx([0, ['Target address: 0x%04x' | |
86 | % ((self.bytes[2] << 8) + self.bytes[1])]]) | |
87 | elif 3 < len(self.bytes): | |
88 | self.ss, self.es = ss, es | |
89 | self.putx([0, ['Data: 0x%02x' % self.bytes[-1]]]) | |
90 | elif 0xf5 == self.bytes[0]: # Channel Access Read | |
91 | if 2 == len(self.bytes): | |
92 | self.ss = ss | |
93 | elif 2 < len(self.bytes): | |
94 | self.ss, self.es = ss, es | |
95 | self.putx([0, ['PIO sample: 0x%02x' % self.bytes[-1]]]) | |
96 | elif 0x5a == self.bytes[0]: # Channel Access Write | |
97 | if 2 == len(self.bytes): | |
98 | self.ss = ss | |
99 | elif 3 == len(self.bytes): | |
100 | self.es = es | |
101 | if (self.bytes[-1] == (self.bytes[-2] ^ 0xff)): | |
102 | self.putx([0, ['Data: 0x%02x (bit-inversion correct: 0x%02x)' % (self.bytes[-2], self.bytes[-1])]]) | |
103 | else: | |
104 | self.putx([0, ['Data error: second byte (0x%02x) is not bit-inverse of first (0x%02x)' % (self.bytes[-1], self.bytes[-2])]]) | |
105 | elif 3 < len(self.bytes): | |
106 | self.ss, self.es = ss, es | |
107 | if 0xaa == self.bytes[-1]: | |
108 | self.putx([0, ['Success']]) | |
109 | elif 0xff == self.bytes[-1]: | |
110 | self.putx([0, ['Fail New State']]) | |
111 | elif 0xcc == self.bytes[0]: # Write Conditional Search Register | |
112 | if 2 == len(self.bytes): | |
113 | self.ss = ss | |
114 | elif 3 == len(self.bytes): | |
115 | self.es = es | |
116 | self.putx([0, ['Target address: 0x%04x' | |
117 | % ((self.bytes[2] << 8) + self.bytes[1])]]) | |
118 | elif 3 < len(self.bytes): | |
119 | self.ss, self.es = ss, es | |
120 | self.putx([0, ['Data: 0x%02x' % self.bytes[-1]]]) | |
121 | elif 0xc3 == self.bytes[0]: # Reset Activity Latches | |
122 | if 2 == len(self.bytes): | |
123 | self.ss = ss | |
124 | elif 2 < len(self.bytes): | |
125 | self.ss, self.es = ss, es | |
126 | if 0xaa == self.bytes[-1]: | |
127 | self.putx([0, ['Success']]) | |
128 | else: | |
129 | self.putx([0, ['Invalid byte']]) |