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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <stdlib.h> | |
23 | #include <math.h> | |
24 | #include <string.h> | |
25 | #include <glib.h> | |
26 | #include <libsigrok/libsigrok.h> | |
27 | #include "libsigrok-internal.h" | |
28 | #include "protocol.h" | |
29 | ||
30 | static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, | |
31 | void *info) | |
32 | { | |
33 | struct scale_info *scale; | |
34 | float floatval; | |
35 | struct sr_datafeed_packet packet; | |
36 | struct sr_datafeed_analog_old analog; | |
37 | struct dev_context *devc; | |
38 | ||
39 | scale = (struct scale_info *)sdi->driver; | |
40 | ||
41 | devc = sdi->priv; | |
42 | ||
43 | memset(&analog, 0, sizeof(struct sr_datafeed_analog_old)); | |
44 | ||
45 | analog.channels = sdi->channels; | |
46 | analog.num_samples = 1; | |
47 | analog.mq = -1; | |
48 | ||
49 | scale->packet_parse(buf, &floatval, &analog, info); | |
50 | analog.data = &floatval; | |
51 | ||
52 | if (analog.mq != -1) { | |
53 | /* Got a measurement. */ | |
54 | packet.type = SR_DF_ANALOG_OLD; | |
55 | packet.payload = &analog; | |
56 | sr_session_send(sdi, &packet); | |
57 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
58 | } | |
59 | } | |
60 | ||
61 | static void handle_new_data(struct sr_dev_inst *sdi, void *info) | |
62 | { | |
63 | struct scale_info *scale; | |
64 | struct dev_context *devc; | |
65 | int len, i, offset = 0; | |
66 | struct sr_serial_dev_inst *serial; | |
67 | ||
68 | scale = (struct scale_info *)sdi->driver; | |
69 | ||
70 | devc = sdi->priv; | |
71 | serial = sdi->conn; | |
72 | ||
73 | /* Try to get as much data as the buffer can hold. */ | |
74 | len = SCALE_BUFSIZE - devc->buflen; | |
75 | len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len); | |
76 | if (len == 0) | |
77 | return; /* No new bytes, nothing to do. */ | |
78 | if (len < 0) { | |
79 | sr_err("Serial port read error: %d.", len); | |
80 | return; | |
81 | } | |
82 | devc->buflen += len; | |
83 | ||
84 | /* Now look for packets in that data. */ | |
85 | while ((devc->buflen - offset) >= scale->packet_size) { | |
86 | if (scale->packet_valid(devc->buf + offset)) { | |
87 | handle_packet(devc->buf + offset, sdi, info); | |
88 | offset += scale->packet_size; | |
89 | } else { | |
90 | offset++; | |
91 | } | |
92 | } | |
93 | ||
94 | /* If we have any data left, move it to the beginning of our buffer. */ | |
95 | for (i = 0; i < devc->buflen - offset; i++) | |
96 | devc->buf[i] = devc->buf[offset + i]; | |
97 | devc->buflen -= offset; | |
98 | } | |
99 | ||
100 | SR_PRIV int kern_scale_receive_data(int fd, int revents, void *cb_data) | |
101 | { | |
102 | struct sr_dev_inst *sdi; | |
103 | struct dev_context *devc; | |
104 | struct scale_info *scale; | |
105 | void *info; | |
106 | ||
107 | (void)fd; | |
108 | ||
109 | if (!(sdi = cb_data)) | |
110 | return TRUE; | |
111 | ||
112 | if (!(devc = sdi->priv)) | |
113 | return TRUE; | |
114 | ||
115 | scale = (struct scale_info *)sdi->driver; | |
116 | ||
117 | if (revents == G_IO_IN) { | |
118 | /* Serial data arrived. */ | |
119 | info = g_malloc(scale->info_size); | |
120 | handle_new_data(sdi, info); | |
121 | g_free(info); | |
122 | } | |
123 | ||
124 | if (sr_sw_limits_check(&devc->limits)) | |
125 | sdi->driver->dev_acquisition_stop(sdi); | |
126 | ||
127 | return TRUE; | |
128 | } |