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