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686f0c36 PA |
1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2015 Petteri Aimonen <jpa@sigrok.mail.kapsi.fi> | |
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/>. |
686f0c36 PA |
18 | ## |
19 | ||
20 | import sigrokdecode as srd | |
21 | ||
22 | class Decoder(srd.Decoder): | |
23 | api_version = 2 | |
24 | id = 'arm_tpiu' | |
25 | name = 'ARM TPIU' | |
26 | longname = 'ARM Trace Port Interface Unit' | |
a7c8dc5e | 27 | desc = 'Filter TPIU formatted trace data into separate streams.' |
686f0c36 PA |
28 | license = 'gplv2+' |
29 | inputs = ['uart'] | |
30 | outputs = ['uart'] # Emulate uart output so that arm_itm/arm_etm can stack. | |
31 | options = ( | |
32 | {'id': 'stream', 'desc': 'Stream index', 'default': 1}, | |
33 | {'id': 'sync_offset', 'desc': 'Initial sync offset', 'default': 0}, | |
34 | ) | |
35 | annotations = ( | |
36 | ('stream', 'Current stream'), | |
37 | ('data', 'Stream data'), | |
38 | ) | |
39 | annotation_rows = ( | |
40 | ('stream', 'Current stream', (0,)), | |
41 | ('data', 'Stream data', (1,)), | |
42 | ) | |
43 | ||
92b7b49f | 44 | def __init__(self): |
686f0c36 PA |
45 | self.buf = [] |
46 | self.syncbuf = [] | |
47 | self.prevsample = 0 | |
48 | self.stream = 0 | |
5b0b88ce | 49 | self.ss_stream = None |
686f0c36 PA |
50 | self.bytenum = 0 |
51 | ||
52 | def start(self): | |
53 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
54 | self.out_python = self.register(srd.OUTPUT_PYTHON) | |
55 | ||
56 | def stream_changed(self, ss, stream): | |
57 | if self.stream != stream: | |
58 | if self.stream != 0: | |
5b0b88ce | 59 | self.put(self.ss_stream, ss, self.out_ann, |
a9f7935a | 60 | [0, ['Stream %d' % self.stream, 'S%d' % self.stream]]) |
686f0c36 | 61 | self.stream = stream |
5b0b88ce | 62 | self.ss_stream = ss |
686f0c36 PA |
63 | |
64 | def emit_byte(self, ss, es, byte): | |
65 | if self.stream == self.options['stream']: | |
a9f7935a | 66 | self.put(ss, es, self.out_ann, [1, ['0x%02x' % byte]]) |
686f0c36 PA |
67 | self.put(ss, es, self.out_python, ['DATA', 0, (byte, [])]) |
68 | ||
69 | def process_frame(self, buf): | |
70 | # Byte 15 contains the lowest bits of bytes 0, 2, ... 14. | |
71 | lowbits = buf[15][2] | |
72 | ||
73 | for i in range(0, 15, 2): | |
74 | # Odd bytes can be stream ID or data. | |
75 | delayed_stream_change = None | |
76 | lowbit = (lowbits >> (i // 2)) & 0x01 | |
77 | if buf[i][2] & 0x01 != 0: | |
78 | if lowbit: | |
79 | delayed_stream_change = buf[i][2] >> 1 | |
80 | else: | |
81 | self.stream_changed(buf[i][0], buf[i][2] >> 1) | |
82 | else: | |
83 | byte = buf[i][2] | lowbit | |
84 | self.emit_byte(buf[i][0], buf[i][1], byte) | |
85 | ||
86 | # Even bytes are always data. | |
87 | if i < 14: | |
88 | self.emit_byte(buf[i+1][0], buf[i+1][1], buf[i+1][2]) | |
89 | ||
90 | # The stream change can be delayed to occur after the data byte. | |
91 | if delayed_stream_change is not None: | |
92 | self.stream_changed(buf[i+1][1], delayed_stream_change) | |
93 | ||
94 | def decode(self, ss, es, data): | |
95 | ptype, rxtx, pdata = data | |
96 | ||
97 | if ptype != 'DATA': | |
98 | return | |
99 | ||
100 | # Reset packet if there is a long pause between bytes. | |
101 | self.byte_len = es - ss | |
102 | if ss - self.prevsample > self.byte_len: | |
103 | self.buf = [] | |
104 | self.prevsample = es | |
105 | ||
106 | self.buf.append((ss, es, pdata[0])) | |
107 | self.bytenum += 1 | |
108 | ||
109 | # Allow skipping N first bytes of the data. By adjusting the sync | |
110 | # value, one can get initial synchronization as soon as the trace | |
111 | # starts. | |
112 | if self.bytenum < self.options['sync_offset']: | |
113 | self.buf = [] | |
114 | return | |
115 | ||
116 | # Keep separate buffer for detection of sync packets. | |
117 | # Sync packets override everything else, so that we can regain sync | |
118 | # even if some packets are corrupted. | |
119 | self.syncbuf = self.syncbuf[-3:] + [pdata[0]] | |
120 | if self.syncbuf == [0xFF, 0xFF, 0xFF, 0x7F]: | |
121 | self.buf = [] | |
122 | self.syncbuf = [] | |
123 | return | |
124 | ||
125 | if len(self.buf) == 16: | |
126 | self.process_frame(self.buf) | |
127 | self.buf = [] |