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1 | /* | |
2 | * This file is part of the libsigrokdecode project. | |
3 | * | |
4 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.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 3 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 | #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */ | |
21 | #include "libsigrokdecode.h" | |
22 | #include "config.h" | |
23 | #include <inttypes.h> | |
24 | #include <string.h> | |
25 | ||
26 | static PyObject *srd_logic_iter(PyObject *self) | |
27 | { | |
28 | return self; | |
29 | } | |
30 | ||
31 | static PyObject *srd_logic_iternext(PyObject *self) | |
32 | { | |
33 | srd_logic *logic; | |
34 | PyObject *py_samplenum, *py_samples; | |
35 | uint8_t *sample_pos, sample; | |
36 | int byte_offset, bit_offset, i; | |
37 | ||
38 | logic = (srd_logic *)self; | |
39 | if (logic->itercnt >= logic->inbuflen / logic->di->data_unitsize) { | |
40 | /* End iteration loop. */ | |
41 | return NULL; | |
42 | } | |
43 | ||
44 | /* | |
45 | * Convert the bit-packed sample to an array of bytes, with only 0x01 | |
46 | * and 0x00 values, so the PD doesn't need to do any bitshifting. | |
47 | */ | |
48 | sample_pos = logic->inbuf + logic->itercnt * logic->di->data_unitsize; | |
49 | for (i = 0; i < logic->di->dec_num_channels; i++) { | |
50 | /* A channelmap value of -1 means "unused optional channel". */ | |
51 | if (logic->di->dec_channelmap[i] == -1) { | |
52 | /* Value of unused channel is 0xff, instead of 0 or 1. */ | |
53 | logic->di->channel_samples[i] = 0xff; | |
54 | } else { | |
55 | byte_offset = logic->di->dec_channelmap[i] / 8; | |
56 | bit_offset = logic->di->dec_channelmap[i] % 8; | |
57 | sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0; | |
58 | logic->di->channel_samples[i] = sample; | |
59 | } | |
60 | } | |
61 | ||
62 | /* Prepare the next samplenum/sample list in this iteration. */ | |
63 | py_samplenum = | |
64 | PyLong_FromUnsignedLongLong(logic->start_samplenum + | |
65 | logic->itercnt); | |
66 | PyList_SetItem(logic->sample, 0, py_samplenum); | |
67 | py_samples = PyBytes_FromStringAndSize((const char *)logic->di->channel_samples, | |
68 | logic->di->dec_num_channels); | |
69 | PyList_SetItem(logic->sample, 1, py_samples); | |
70 | Py_INCREF(logic->sample); | |
71 | logic->itercnt++; | |
72 | ||
73 | return logic->sample; | |
74 | } | |
75 | ||
76 | /** @cond PRIVATE */ | |
77 | SRD_PRIV PyTypeObject srd_logic_type = { | |
78 | PyVarObject_HEAD_INIT(NULL, 0) | |
79 | .tp_name = "srd_logic", | |
80 | .tp_basicsize = sizeof(srd_logic), | |
81 | .tp_flags = Py_TPFLAGS_DEFAULT, | |
82 | .tp_doc = "Sigrokdecode logic sample object", | |
83 | .tp_iter = srd_logic_iter, | |
84 | .tp_iternext = srd_logic_iternext, | |
85 | }; | |
86 | /** @endcond */ |