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/*
* This file is part of the libsigrokdecode project.
*
* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include "libsigrokdecode.h"
#include <inttypes.h>
#include <string.h>
static PyObject *srd_logic_iter(PyObject *self)
{
return self;
}
static PyObject *srd_logic_iternext(PyObject *self)
{
srd_logic *logic;
PyObject *py_samplenum, *py_samples;
uint8_t *sample_pos, sample;
int byte_offset, bit_offset, i;
logic = (srd_logic *)self;
if (logic->itercnt >= logic->inbuflen / logic->di->data_unitsize) {
/* End iteration loop. */
return NULL;
}
/*
* Convert the bit-packed sample to an array of bytes, with only 0x01
* and 0x00 values, so the PD doesn't need to do any bitshifting.
*/
sample_pos = logic->inbuf + logic->itercnt * logic->di->data_unitsize;
for (i = 0; i < logic->di->dec_num_channels; i++) {
/* A channelmap value of -1 means "unused optional channel". */
if (logic->di->dec_channelmap[i] == -1) {
/* Value of unused channel is 0xff, instead of 0 or 1. */
logic->di->channel_samples[i] = 0xff;
} else {
byte_offset = logic->di->dec_channelmap[i] / 8;
bit_offset = logic->di->dec_channelmap[i] % 8;
sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
logic->di->channel_samples[i] = sample;
}
}
/* Prepare the next samplenum/sample list in this iteration. */
py_samplenum =
PyLong_FromUnsignedLongLong(logic->start_samplenum +
logic->itercnt);
PyList_SetItem(logic->sample, 0, py_samplenum);
py_samples = PyBytes_FromStringAndSize((const char *)logic->di->channel_samples,
logic->di->dec_num_channels);
PyList_SetItem(logic->sample, 1, py_samples);
Py_INCREF(logic->sample);
logic->itercnt++;
return logic->sample;
}
/** @cond PRIVATE */
SRD_PRIV PyTypeObject srd_logic_type = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "srd_logic",
.tp_basicsize = sizeof(srd_logic),
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_doc = "Sigrokdecode logic sample object",
.tp_iter = srd_logic_iter,
.tp_iternext = srd_logic_iternext,
};
/** @endcond */
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