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117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
/*
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* This file is part of the libsigrokdecode project.
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*
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* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
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* Copyright (C) 2016 DreamSourceLab <support@dreamsourcelab.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
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#include "libsigrokdecode.h"
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#include <inttypes.h>
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#include <string.h>
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static PyObject *srd_logic_iter(PyObject *self)
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{
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return self;
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}
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static PyObject *srd_logic_iternext(PyObject *self)
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{
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srd_logic *logic;
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PyObject *py_samplenum, *py_samples;
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uint8_t *sample_pos, sample;
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int byte_offset, bit_offset, i;
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logic = (srd_logic *)self;
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uint64_t offset = floor(logic->itercnt);
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logic->di->cur_pos = logic->cur_pos;
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logic->di->logic_mask = 0;
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logic->di->exp_logic = 0;
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if (logic->logic_mask != 0) {
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if (logic->edge_index == -1)
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logic->di->edge_index = -1;
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else
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logic->di->edge_index = logic->di->dec_channelmap[logic->edge_index];
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for (i = 0; i < logic->di->dec_num_channels; i++) {
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int index = logic->di->dec_channelmap[i];
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if ((logic->logic_mask & (0x01 << i)) && index != -1) {
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logic->di->logic_mask += 0x01 << index;
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logic->di->exp_logic += ((logic->exp_logic & (0x01 << i)) >> i) << index;
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}
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}
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}
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if (offset >= logic->inbuflen / logic->di->data_unitsize || logic->logic_mask != 0) {
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/* End iteration loop. */
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return NULL;
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}
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/*
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* Convert the bit-packed sample to an array of bytes, with only 0x01
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* and 0x00 values, so the PD doesn't need to do any bitshifting.
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*/
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sample_pos = logic->inbuf + offset * logic->di->data_unitsize;
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for (i = 0; i < logic->di->dec_num_channels; i++) {
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/* A channelmap value of -1 means "unused optional channel". */
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if (logic->di->dec_channelmap[i] == -1) {
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/* Value of unused channel is 0xff, instead of 0 or 1. */
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logic->di->channel_samples[i] = 0xff;
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} else {
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byte_offset = logic->di->dec_channelmap[i] / 8;
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bit_offset = logic->di->dec_channelmap[i] % 8;
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sample = *(sample_pos + byte_offset) & (1 << bit_offset) ? 1 : 0;
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logic->di->channel_samples[i] = sample;
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}
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}
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/* Prepare the next samplenum/sample list in this iteration. */
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py_samplenum = PyLong_FromUnsignedLongLong(logic->start_samplenum + offset);
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PyList_SetItem(logic->sample, 0, py_samplenum);
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py_samples = PyBytes_FromStringAndSize((const char *)logic->di->channel_samples,
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logic->di->dec_num_channels);
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PyList_SetItem(logic->sample, 1, py_samples);
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Py_INCREF(logic->sample);
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return logic->sample;
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}
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static PyMemberDef srd_logic_members[] = {
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{"itercnt", T_FLOAT, offsetof(srd_logic, itercnt), 0,
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"next expacted samples offset"},
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{"logic_mask", T_ULONGLONG, offsetof(srd_logic, logic_mask), 0,
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"next expacted logic value mask"},
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{"exp_logic", T_ULONGLONG, offsetof(srd_logic, exp_logic), 0,
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"next expacted logic value"},
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{"edge_index", T_INT, offsetof(srd_logic, edge_index), 0,
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"channel index of next expacted edge"},
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{"cur_pos", T_ULONGLONG, offsetof(srd_logic, cur_pos), 0,
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"current sample position"},
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{NULL} /* Sentinel */
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};
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/** @cond PRIVATE */
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SRD_PRIV PyTypeObject srd_logic_type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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.tp_name = "srd_logic",
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.tp_basicsize = sizeof(srd_logic),
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.tp_flags = Py_TPFLAGS_DEFAULT,
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.tp_doc = "Sigrokdecode logic sample object",
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.tp_members = srd_logic_members,
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.tp_iter = srd_logic_iter,
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.tp_iternext = srd_logic_iternext,
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};
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/** @endcond */
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