libsigrokdecode
 All Data Structures Files Functions Variables Typedefs Enumerator Macros
type_logic.c
Go to the documentation of this file.
1 /*
2  * This file is part of the sigrok 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 "sigrokdecode.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
21 #include "config.h"
22 #include <inttypes.h>
23 #include <string.h>
24 
25 static PyObject *srd_logic_iter(PyObject *self)
26 {
27  return self;
28 }
29 
30 static PyObject *srd_logic_iternext(PyObject *self)
31 {
32  int i;
33  PyObject *py_samplenum, *py_samples;
34  srd_logic *logic;
35  uint64_t sample;
36  uint8_t probe_samples[SRD_MAX_NUM_PROBES + 1];
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  memcpy(&sample,
49  logic->inbuf + logic->itercnt * logic->di->data_unitsize,
50  logic->di->data_unitsize);
51  for (i = 0; i < logic->di->dec_num_probes; i++)
52  probe_samples[i] = sample & (1 << logic->di->dec_probemap[i]) ? 1 : 0;
53 
54  /* Prepare the next samplenum/sample list in this iteration. */
55  py_samplenum =
56  PyLong_FromUnsignedLongLong(logic->start_samplenum +
57  logic->itercnt);
58  PyList_SetItem(logic->sample, 0, py_samplenum);
59  py_samples = PyBytes_FromStringAndSize((const char *)probe_samples,
60  logic->di->dec_num_probes);
61  PyList_SetItem(logic->sample, 1, py_samples);
62  Py_INCREF(logic->sample);
63  logic->itercnt++;
64 
65  return logic->sample;
66 }
67 
68 SRD_PRIV PyTypeObject srd_logic_type = {
69  PyVarObject_HEAD_INIT(NULL, 0)
70  .tp_name = "srd_logic",
71  .tp_basicsize = sizeof(srd_logic),
72  .tp_flags = Py_TPFLAGS_DEFAULT,
73  .tp_doc = "Sigrokdecode logic sample object",
74  .tp_iter = srd_logic_iter,
75  .tp_iternext = srd_logic_iternext,
76 };