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1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2016 Robert Bosch Car Multimedia GmbH | |
5 | ## Authors: Oleksij Rempel | |
6 | ## <fixed-term.Oleksij.Rempel@de.bosch.com> | |
7 | ## <linux@rempel-privat.de> | |
8 | ## | |
9 | ## This program is free software; you can redistribute it and/or modify | |
10 | ## it under the terms of the GNU General Public License as published by | |
11 | ## the Free Software Foundation; either version 2 of the License, or | |
12 | ## (at your option) any later version. | |
13 | ## | |
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14 | ## This program is distributed in the hope that it will be useful, |
15 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ## GNU General Public License for more details. | |
18 | ## | |
19 | ## You should have received a copy of the GNU General Public License | |
20 | ## along with this program; if not, write to the Free Software | |
21 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | ## | |
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23 | |
24 | import sigrokdecode as srd | |
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25 | |
26 | class Decoder(srd.Decoder): | |
27 | api_version = 2 | |
28 | id = 'ssi32' | |
29 | name = 'SSI32' | |
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30 | longname = 'Synchronous Serial Interface (32bit)' |
31 | desc = 'Synchronous Serial Interface (32bit) protocol.' | |
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32 | license = 'gplv2+' |
33 | inputs = ['spi'] | |
34 | outputs = ['ssi32'] | |
35 | options = ( | |
36 | {'id': 'msgsize', 'desc': 'Message size', 'default': 64}, | |
37 | ) | |
38 | annotations = ( | |
39 | ('ctrl-tx', 'CTRL TX'), | |
40 | ('ack-tx', 'ACK TX'), | |
41 | ('ctrl-rx', 'CTRL RX'), | |
d66d47ed | 42 | ('ack-rx', 'ACK RX'), |
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43 | ) |
44 | annotation_rows = ( | |
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45 | ('tx', 'TX', (0, 1)), |
46 | ('rx', 'RX', (2, 3)), | |
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47 | ) |
48 | ||
49 | def __init__(self): | |
50 | self.ss_cmd, self.es_cmd = 0, 0 | |
51 | self.mosi_bytes = [] | |
52 | self.miso_bytes = [] | |
53 | self.es_array = [] | |
54 | self.rx_size = 0 | |
55 | self.tx_size = 0 | |
56 | ||
57 | def start(self): | |
58 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
59 | ||
60 | def putx(self, data): | |
61 | self.put(self.ss_cmd, self.es_cmd, self.out_ann, data) | |
62 | ||
63 | def reset(self): | |
64 | self.mosi_bytes = [] | |
65 | self.miso_bytes = [] | |
66 | self.es_array = [] | |
67 | ||
68 | def handle_ack(self): | |
d66d47ed | 69 | # Only first byte should have ACK data, other 3 bytes are reserved. |
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70 | self.es_cmd = self.es_array[0] |
71 | self.putx([1, ['> ACK:0x%02x' % (self.mosi_bytes[0])]]) | |
72 | self.putx([3, ['< ACK:0x%02x' % (self.miso_bytes[0])]]) | |
73 | ||
74 | def handle_ctrl(self): | |
75 | mosi = miso = '' | |
76 | self.tx_size = self.mosi_bytes[2] | |
77 | self.rx_size = self.miso_bytes[2] | |
78 | ||
79 | if self.tx_size > 0: | |
80 | mosi = ', DATA:0x' + ''.join(format(x, '02x') for x in self.mosi_bytes[4:self.tx_size + 4]) | |
81 | if self.rx_size > 0: | |
82 | miso = ', DATA:0x' + ''.join(format(x, '02x') for x in self.miso_bytes[4:self.rx_size + 4]) | |
83 | ||
84 | self.es_cmd = self.es_array[self.tx_size + 3] | |
d66d47ed | 85 | self.putx([0, ['> CTRL:0x%02x, LUN:0x%02x, SIZE:0x%02x, CRC:0x%02x%s' |
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86 | % (self.mosi_bytes[0], self.mosi_bytes[1], |
87 | self.mosi_bytes[2], self.mosi_bytes[3], mosi)]]) | |
88 | ||
89 | self.es_cmd = self.es_array[self.rx_size + 3] | |
d66d47ed | 90 | self.putx([2, ['< CTRL:0x%02x, LUN:0x%02x, SIZE:0x%02x, CRC:0x%02x%s' |
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91 | % (self.miso_bytes[0], self.miso_bytes[1], |
92 | self.miso_bytes[2], self.miso_bytes[3], miso)]]) | |
93 | ||
94 | def decode(self, ss, es, data): | |
95 | ptype = data[0] | |
96 | if ptype == 'CS-CHANGE': | |
97 | self.reset() | |
98 | return | |
99 | ||
100 | # Don't care about anything else. | |
101 | if ptype != 'DATA': | |
102 | return | |
103 | mosi, miso = data[1:] | |
104 | ||
105 | self.ss, self.es = ss, es | |
106 | ||
107 | if len(self.mosi_bytes) == 0: | |
108 | self.ss_cmd = ss | |
109 | self.mosi_bytes.append(mosi) | |
110 | self.miso_bytes.append(miso) | |
111 | self.es_array.append(es) | |
112 | ||
113 | if self.mosi_bytes[0] & 0x80: | |
114 | if len(self.mosi_bytes) < 4: | |
115 | return | |
116 | ||
117 | self.handle_ack() | |
118 | self.reset() | |
119 | else: | |
120 | if len(self.mosi_bytes) < self.options['msgsize']: | |
121 | return | |
122 | ||
123 | self.handle_ctrl() | |
124 | self.reset() |