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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com> | |
5 | * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
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 log_dmm_packet(const uint8_t *buf, size_t len) | |
31 | { | |
32 | GString *text; | |
33 | ||
34 | text = sr_hexdump_new(buf, len); | |
35 | sr_dbg("DMM packet: %s", text->str); | |
36 | sr_hexdump_free(text); | |
37 | } | |
38 | ||
39 | static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, | |
40 | void *info) | |
41 | { | |
42 | struct dmm_info *dmm; | |
43 | float floatval; | |
44 | struct sr_datafeed_packet packet; | |
45 | struct sr_datafeed_analog analog; | |
46 | struct sr_analog_encoding encoding; | |
47 | struct sr_analog_meaning meaning; | |
48 | struct sr_analog_spec spec; | |
49 | struct dev_context *devc; | |
50 | gboolean sent_sample; | |
51 | struct sr_channel *channel; | |
52 | size_t ch_idx; | |
53 | ||
54 | dmm = (struct dmm_info *)sdi->driver; | |
55 | ||
56 | log_dmm_packet(buf, dmm->packet_size); | |
57 | devc = sdi->priv; | |
58 | ||
59 | sent_sample = FALSE; | |
60 | memset(info, 0, dmm->info_size); | |
61 | for (ch_idx = 0; ch_idx < dmm->channel_count; ch_idx++) { | |
62 | /* Note: digits/spec_digits will be overridden by the DMM parsers. */ | |
63 | sr_analog_init(&analog, &encoding, &meaning, &spec, 0); | |
64 | ||
65 | channel = g_slist_nth_data(sdi->channels, ch_idx); | |
66 | analog.meaning->channels = g_slist_append(NULL, channel); | |
67 | analog.num_samples = 1; | |
68 | analog.meaning->mq = 0; | |
69 | ||
70 | dmm->packet_parse(buf, &floatval, &analog, info); | |
71 | analog.data = &floatval; | |
72 | ||
73 | /* If this DMM needs additional handling, call the resp. function. */ | |
74 | if (dmm->dmm_details) | |
75 | dmm->dmm_details(&analog, info); | |
76 | ||
77 | if (analog.meaning->mq != 0 && channel->enabled) { | |
78 | /* Got a measurement. */ | |
79 | packet.type = SR_DF_ANALOG; | |
80 | packet.payload = &analog; | |
81 | sr_session_send(sdi, &packet); | |
82 | sent_sample = TRUE; | |
83 | } | |
84 | } | |
85 | ||
86 | if (sent_sample) { | |
87 | sr_sw_limits_update_samples_read(&devc->limits, 1); | |
88 | } | |
89 | } | |
90 | ||
91 | /** Request packet, if required. */ | |
92 | SR_PRIV int req_packet(struct sr_dev_inst *sdi) | |
93 | { | |
94 | struct dmm_info *dmm; | |
95 | struct dev_context *devc; | |
96 | struct sr_serial_dev_inst *serial; | |
97 | int ret; | |
98 | ||
99 | dmm = (struct dmm_info *)sdi->driver; | |
100 | ||
101 | if (!dmm->packet_request) | |
102 | return SR_OK; | |
103 | ||
104 | devc = sdi->priv; | |
105 | serial = sdi->conn; | |
106 | ||
107 | if (devc->req_next_at && (devc->req_next_at > g_get_monotonic_time())) { | |
108 | sr_spew("Not requesting new packet yet, %" PRIi64 " ms left.", | |
109 | ((devc->req_next_at - g_get_monotonic_time()) / 1000)); | |
110 | return SR_OK; | |
111 | } | |
112 | ||
113 | ret = dmm->packet_request(serial); | |
114 | if (ret < 0) { | |
115 | sr_err("Failed to request packet: %d.", ret); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | if (dmm->req_timeout_ms) | |
120 | devc->req_next_at = g_get_monotonic_time() + (dmm->req_timeout_ms * 1000); | |
121 | ||
122 | return SR_OK; | |
123 | } | |
124 | ||
125 | static void handle_new_data(struct sr_dev_inst *sdi, void *info) | |
126 | { | |
127 | struct dmm_info *dmm; | |
128 | struct dev_context *devc; | |
129 | int len, offset; | |
130 | struct sr_serial_dev_inst *serial; | |
131 | ||
132 | dmm = (struct dmm_info *)sdi->driver; | |
133 | ||
134 | devc = sdi->priv; | |
135 | serial = sdi->conn; | |
136 | ||
137 | /* Try to get as much data as the buffer can hold. */ | |
138 | len = DMM_BUFSIZE - devc->buflen; | |
139 | len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len); | |
140 | if (len == 0) | |
141 | return; /* No new bytes, nothing to do. */ | |
142 | if (len < 0) { | |
143 | sr_err("Serial port read error: %d.", len); | |
144 | return; | |
145 | } | |
146 | devc->buflen += len; | |
147 | ||
148 | /* Now look for packets in that data. */ | |
149 | offset = 0; | |
150 | while ((devc->buflen - offset) >= dmm->packet_size) { | |
151 | if (dmm->packet_valid(devc->buf + offset)) { | |
152 | handle_packet(devc->buf + offset, sdi, info); | |
153 | offset += dmm->packet_size; | |
154 | ||
155 | /* Request next packet, if required. */ | |
156 | if (!dmm->packet_request) | |
157 | break; | |
158 | if (dmm->req_timeout_ms || dmm->req_delay_ms) | |
159 | devc->req_next_at = g_get_monotonic_time() + | |
160 | dmm->req_delay_ms * 1000; | |
161 | req_packet(sdi); | |
162 | } else { | |
163 | offset++; | |
164 | } | |
165 | } | |
166 | ||
167 | /* If we have any data left, move it to the beginning of our buffer. */ | |
168 | if (devc->buflen > offset) | |
169 | memmove(devc->buf, devc->buf + offset, devc->buflen - offset); | |
170 | devc->buflen -= offset; | |
171 | } | |
172 | ||
173 | int receive_data(int fd, int revents, void *cb_data) | |
174 | { | |
175 | struct sr_dev_inst *sdi; | |
176 | struct dev_context *devc; | |
177 | struct dmm_info *dmm; | |
178 | void *info; | |
179 | ||
180 | (void)fd; | |
181 | ||
182 | if (!(sdi = cb_data)) | |
183 | return TRUE; | |
184 | ||
185 | if (!(devc = sdi->priv)) | |
186 | return TRUE; | |
187 | ||
188 | dmm = (struct dmm_info *)sdi->driver; | |
189 | ||
190 | if (revents == G_IO_IN) { | |
191 | /* Serial data arrived. */ | |
192 | info = g_malloc(dmm->info_size); | |
193 | handle_new_data(sdi, info); | |
194 | g_free(info); | |
195 | } else { | |
196 | /* Timeout; send another packet request if DMM needs it. */ | |
197 | if (dmm->packet_request && (req_packet(sdi) < 0)) | |
198 | return FALSE; | |
199 | } | |
200 | ||
201 | if (sr_sw_limits_check(&devc->limits)) | |
202 | sr_dev_acquisition_stop(sdi); | |
203 | ||
204 | return TRUE; | |
205 | } |