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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 <stdlib.h> | |
22 | #include <math.h> | |
23 | #include <string.h> | |
24 | #include <glib.h> | |
25 | #include <libsigrok/libsigrok.h> | |
26 | #include "libsigrok-internal.h" | |
27 | #include "protocol.h" | |
28 | ||
29 | static void log_dmm_packet(const uint8_t *buf) | |
30 | { | |
31 | sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x " | |
32 | "%02x %02x %02x %02x %02x %02x %02x %02x %02x " | |
33 | "%02x %02x %02x %02x %02x %02x %02x", | |
34 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], | |
35 | buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], | |
36 | buf[14], buf[15], buf[16], buf[17], buf[18], buf[19], buf[20], | |
37 | buf[21], buf[22]); | |
38 | } | |
39 | ||
40 | static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, | |
41 | void *info) | |
42 | { | |
43 | struct dmm_info *dmm; | |
44 | float floatval; | |
45 | struct sr_datafeed_packet packet; | |
46 | struct sr_datafeed_analog analog; | |
47 | struct dev_context *devc; | |
48 | ||
49 | dmm = (struct dmm_info *)sdi->driver; | |
50 | ||
51 | log_dmm_packet(buf); | |
52 | devc = sdi->priv; | |
53 | ||
54 | memset(&analog, 0, sizeof(struct sr_datafeed_analog)); | |
55 | ||
56 | analog.channels = sdi->channels; | |
57 | analog.num_samples = 1; | |
58 | analog.mq = -1; | |
59 | ||
60 | dmm->packet_parse(buf, &floatval, &analog, info); | |
61 | analog.data = &floatval; | |
62 | ||
63 | /* If this DMM needs additional handling, call the resp. function. */ | |
64 | if (dmm->dmm_details) | |
65 | dmm->dmm_details(&analog, info); | |
66 | ||
67 | if (analog.mq != -1) { | |
68 | /* Got a measurement. */ | |
69 | packet.type = SR_DF_ANALOG; | |
70 | packet.payload = &analog; | |
71 | sr_session_send(devc->cb_data, &packet); | |
72 | devc->num_samples++; | |
73 | } | |
74 | } | |
75 | ||
76 | /** Request packet, if required. */ | |
77 | SR_PRIV int req_packet(struct sr_dev_inst *sdi) | |
78 | { | |
79 | struct dmm_info *dmm; | |
80 | struct dev_context *devc; | |
81 | struct sr_serial_dev_inst *serial; | |
82 | int ret; | |
83 | ||
84 | dmm = (struct dmm_info *)sdi->driver; | |
85 | ||
86 | if (!dmm->packet_request) | |
87 | return SR_OK; | |
88 | ||
89 | devc = sdi->priv; | |
90 | serial = sdi->conn; | |
91 | ||
92 | if (devc->req_next_at && (devc->req_next_at > g_get_monotonic_time())) { | |
93 | sr_spew("Not requesting new packet yet, %" PRIi64 " ms left.", | |
94 | ((devc->req_next_at - g_get_monotonic_time()) / 1000)); | |
95 | return SR_OK; | |
96 | } | |
97 | ||
98 | ret = dmm->packet_request(serial); | |
99 | if (ret < 0) { | |
100 | sr_err("Failed to request packet: %d.", ret); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | if (dmm->req_timeout_ms) | |
105 | devc->req_next_at = g_get_monotonic_time() + (dmm->req_timeout_ms * 1000); | |
106 | ||
107 | return SR_OK; | |
108 | } | |
109 | ||
110 | static void handle_new_data(struct sr_dev_inst *sdi, void *info) | |
111 | { | |
112 | struct dmm_info *dmm; | |
113 | struct dev_context *devc; | |
114 | int len, i, offset = 0; | |
115 | struct sr_serial_dev_inst *serial; | |
116 | ||
117 | dmm = (struct dmm_info *)sdi->driver; | |
118 | ||
119 | devc = sdi->priv; | |
120 | serial = sdi->conn; | |
121 | ||
122 | /* Try to get as much data as the buffer can hold. */ | |
123 | len = DMM_BUFSIZE - devc->buflen; | |
124 | len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len); | |
125 | if (len == 0) | |
126 | return; /* No new bytes, nothing to do. */ | |
127 | if (len < 0) { | |
128 | sr_err("Serial port read error: %d.", len); | |
129 | return; | |
130 | } | |
131 | devc->buflen += len; | |
132 | ||
133 | /* Now look for packets in that data. */ | |
134 | while ((devc->buflen - offset) >= dmm->packet_size) { | |
135 | if (dmm->packet_valid(devc->buf + offset)) { | |
136 | handle_packet(devc->buf + offset, sdi, info); | |
137 | offset += dmm->packet_size; | |
138 | ||
139 | /* Request next packet, if required. */ | |
140 | if (!dmm->packet_request) | |
141 | break; | |
142 | if (dmm->req_timeout_ms || dmm->req_delay_ms) | |
143 | devc->req_next_at = g_get_monotonic_time() + | |
144 | dmm->req_delay_ms * 1000; | |
145 | req_packet(sdi); | |
146 | } else { | |
147 | offset++; | |
148 | } | |
149 | } | |
150 | ||
151 | /* If we have any data left, move it to the beginning of our buffer. */ | |
152 | for (i = 0; i < devc->buflen - offset; i++) | |
153 | devc->buf[i] = devc->buf[offset + i]; | |
154 | devc->buflen -= offset; | |
155 | } | |
156 | ||
157 | int receive_data(int fd, int revents, void *cb_data) | |
158 | { | |
159 | struct sr_dev_inst *sdi; | |
160 | struct dev_context *devc; | |
161 | struct dmm_info *dmm; | |
162 | int64_t time; | |
163 | void *info; | |
164 | ||
165 | (void)fd; | |
166 | ||
167 | if (!(sdi = cb_data)) | |
168 | return TRUE; | |
169 | ||
170 | if (!(devc = sdi->priv)) | |
171 | return TRUE; | |
172 | ||
173 | dmm = (struct dmm_info *)sdi->driver; | |
174 | ||
175 | if (revents == G_IO_IN) { | |
176 | /* Serial data arrived. */ | |
177 | info = g_malloc(dmm->info_size); | |
178 | handle_new_data(sdi, info); | |
179 | g_free(info); | |
180 | } else { | |
181 | /* Timeout; send another packet request if DMM needs it. */ | |
182 | if (dmm->packet_request && (req_packet(sdi) < 0)) | |
183 | return FALSE; | |
184 | } | |
185 | ||
186 | if (devc->limit_samples && devc->num_samples >= devc->limit_samples) { | |
187 | sr_info("Requested number of samples reached."); | |
188 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
189 | return TRUE; | |
190 | } | |
191 | ||
192 | if (devc->limit_msec) { | |
193 | time = (g_get_monotonic_time() - devc->starttime) / 1000; | |
194 | if (time > (int64_t)devc->limit_msec) { | |
195 | sr_info("Requested time limit reached."); | |
196 | sdi->driver->dev_acquisition_stop(sdi, cb_data); | |
197 | return TRUE; | |
198 | } | |
199 | } | |
200 | ||
201 | return TRUE; | |
202 | } |