2 * This file is part of the libsigrok project.
4 * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
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 2 of the License, or
9 * (at your option) any later version.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <libsigrok/libsigrok.h>
27 #include "libsigrok-internal.h"
30 static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi,
33 struct scale_info *scale;
35 struct sr_datafeed_packet packet;
36 struct sr_datafeed_analog analog;
37 struct sr_analog_encoding encoding;
38 struct sr_analog_meaning meaning;
39 struct sr_analog_spec spec;
40 struct dev_context *devc;
42 scale = (struct scale_info *)sdi->driver;
46 sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
48 analog.meaning->channels = sdi->channels;
49 analog.num_samples = 1;
50 analog.meaning->mq = 0;
52 scale->packet_parse(buf, &floatval, &analog, info);
53 analog.data = &floatval;
55 if (analog.meaning->mq != 0) {
56 /* Got a measurement. */
57 packet.type = SR_DF_ANALOG;
58 packet.payload = &analog;
59 sr_session_send(sdi, &packet);
60 sr_sw_limits_update_samples_read(&devc->limits, 1);
64 static void handle_new_data(struct sr_dev_inst *sdi, void *info)
66 struct scale_info *scale;
67 struct dev_context *devc;
68 int len, i, offset = 0;
69 struct sr_serial_dev_inst *serial;
71 scale = (struct scale_info *)sdi->driver;
76 /* Try to get as much data as the buffer can hold. */
77 len = SCALE_BUFSIZE - devc->buflen;
78 len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len);
80 return; /* No new bytes, nothing to do. */
82 sr_err("Serial port read error: %d.", len);
87 /* Now look for packets in that data. */
88 while ((devc->buflen - offset) >= scale->packet_size) {
89 if (scale->packet_valid(devc->buf + offset)) {
90 handle_packet(devc->buf + offset, sdi, info);
91 offset += scale->packet_size;
97 /* If we have any data left, move it to the beginning of our buffer. */
98 for (i = 0; i < devc->buflen - offset; i++)
99 devc->buf[i] = devc->buf[offset + i];
100 devc->buflen -= offset;
103 SR_PRIV int kern_scale_receive_data(int fd, int revents, void *cb_data)
105 struct sr_dev_inst *sdi;
106 struct dev_context *devc;
107 struct scale_info *scale;
112 if (!(sdi = cb_data))
115 if (!(devc = sdi->priv))
118 scale = (struct scale_info *)sdi->driver;
120 if (revents == G_IO_IN) {
121 /* Serial data arrived. */
122 info = g_malloc(scale->info_size);
123 handle_new_data(sdi, info);
127 if (sr_sw_limits_check(&devc->limits))
128 sdi->driver->dev_acquisition_stop(sdi);