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, see <http://www.gnu.org/licenses/>.
25 #include <libsigrok/libsigrok.h>
26 #include "libsigrok-internal.h"
29 static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi,
32 struct scale_info *scale;
34 struct sr_datafeed_packet packet;
35 struct sr_datafeed_analog analog;
36 struct sr_analog_encoding encoding;
37 struct sr_analog_meaning meaning;
38 struct sr_analog_spec spec;
39 struct dev_context *devc;
41 scale = (struct scale_info *)sdi->driver;
45 /* Note: digits/spec_digits will be overridden later. */
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;
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. */
89 while ((devc->buflen - offset) >= scale->packet_size) {
90 if (scale->packet_valid(devc->buf + offset)) {
91 handle_packet(devc->buf + offset, sdi, info);
92 offset += scale->packet_size;
98 /* If we have any data left, move it to the beginning of our buffer. */
99 if (offset < devc->buflen)
100 memmove(devc->buf, devc->buf + offset, devc->buflen - offset);
101 devc->buflen -= offset;
104 SR_PRIV int kern_scale_receive_data(int fd, int revents, void *cb_data)
106 struct sr_dev_inst *sdi;
107 struct dev_context *devc;
108 struct scale_info *scale;
113 if (!(sdi = cb_data))
116 if (!(devc = sdi->priv))
119 scale = (struct scale_info *)sdi->driver;
121 if (revents == G_IO_IN) {
122 /* Serial data arrived. */
123 info = g_malloc(scale->info_size);
124 handle_new_data(sdi, info);
128 if (sr_sw_limits_check(&devc->limits))
129 sr_dev_acquisition_stop(sdi);