132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
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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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <glib.h>
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#include <libsigrok/libsigrok.h>
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#include "libsigrok-internal.h"
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#include "protocol.h"
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static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi,
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void *info)
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{
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struct scale_info *scale;
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float floatval;
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struct sr_datafeed_packet packet;
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struct sr_datafeed_analog analog;
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struct sr_analog_encoding encoding;
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struct sr_analog_meaning meaning;
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struct sr_analog_spec spec;
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struct dev_context *devc;
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scale = (struct scale_info *)sdi->driver;
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devc = sdi->priv;
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sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
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analog.meaning->channels = sdi->channels;
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analog.num_samples = 1;
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analog.meaning->mq = 0;
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scale->packet_parse(buf, &floatval, &analog, info);
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analog.data = &floatval;
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if (analog.meaning->mq != 0) {
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/* Got a measurement. */
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog;
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sr_session_send(sdi, &packet);
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sr_sw_limits_update_samples_read(&devc->limits, 1);
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}
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}
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static void handle_new_data(struct sr_dev_inst *sdi, void *info)
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{
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struct scale_info *scale;
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struct dev_context *devc;
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int len, i, offset = 0;
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struct sr_serial_dev_inst *serial;
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scale = (struct scale_info *)sdi->driver;
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devc = sdi->priv;
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serial = sdi->conn;
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/* Try to get as much data as the buffer can hold. */
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len = SCALE_BUFSIZE - devc->buflen;
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len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len);
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if (len == 0)
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return; /* No new bytes, nothing to do. */
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if (len < 0) {
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sr_err("Serial port read error: %d.", len);
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return;
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}
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devc->buflen += len;
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/* Now look for packets in that data. */
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while ((devc->buflen - offset) >= scale->packet_size) {
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if (scale->packet_valid(devc->buf + offset)) {
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handle_packet(devc->buf + offset, sdi, info);
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offset += scale->packet_size;
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} else {
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offset++;
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}
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}
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/* If we have any data left, move it to the beginning of our buffer. */
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for (i = 0; i < devc->buflen - offset; i++)
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devc->buf[i] = devc->buf[offset + i];
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devc->buflen -= offset;
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}
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SR_PRIV int kern_scale_receive_data(int fd, int revents, void *cb_data)
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{
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struct sr_dev_inst *sdi;
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struct dev_context *devc;
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struct scale_info *scale;
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void *info;
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(void)fd;
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if (!(sdi = cb_data))
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return TRUE;
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if (!(devc = sdi->priv))
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return TRUE;
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scale = (struct scale_info *)sdi->driver;
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if (revents == G_IO_IN) {
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/* Serial data arrived. */
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info = g_malloc(scale->info_size);
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handle_new_data(sdi, info);
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g_free(info);
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}
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if (sr_sw_limits_check(&devc->limits))
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sdi->driver->dev_acquisition_stop(sdi);
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return TRUE;
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}
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