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4d729ddc BV |
1 | /* |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Bert Vermeulen <bert@biot.com> | |
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 3 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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <stdlib.h> | |
21 | #include <glib.h> | |
515ab088 | 22 | #include <string.h> |
4d729ddc BV |
23 | #include "libsigrok.h" |
24 | #include "libsigrok-internal.h" | |
25 | #include "protocol.h" | |
a8d09e13 | 26 | |
a8d09e13 BV |
27 | static void process_packet(const struct sr_dev_inst *sdi) |
28 | { | |
29 | struct dev_context *devc; | |
30 | struct sr_datafeed_packet packet; | |
31 | struct sr_datafeed_analog analog; | |
32 | GString *dbg; | |
33 | float fvalue; | |
34 | int checksum, mode, i; | |
35 | ||
36 | devc = sdi->priv; | |
37 | if (sr_log_loglevel_get() >= SR_LOG_SPEW) { | |
38 | dbg = g_string_sized_new(128); | |
39 | g_string_printf(dbg, "received packet:"); | |
40 | for (i = 0; i < 10; i++) | |
41 | g_string_append_printf(dbg, " %.2x", (devc->buf)[i]); | |
42 | sr_spew("%s", dbg->str); | |
43 | g_string_free(dbg, TRUE); | |
44 | } | |
45 | ||
46 | if (devc->buf[0] != 0x08 || devc->buf[1] != 0x04) { | |
47 | sr_dbg("invalid packet header."); | |
48 | return; | |
49 | } | |
50 | ||
51 | if (devc->buf[8] != 0x01) { | |
52 | sr_dbg("invalid measurement."); | |
53 | return; | |
54 | } | |
55 | ||
56 | checksum = 0; | |
57 | for (i = 0; i < 9; i++) | |
58 | checksum += devc->buf[i]; | |
59 | if ((checksum & 0xff) != devc->buf[9]) { | |
60 | sr_dbg("invalid packet checksum."); | |
61 | return; | |
62 | } | |
63 | ||
64 | fvalue = 0.0; | |
65 | for (i = 3; i < 8; i++) { | |
66 | if (devc->buf[i] > 0x09) | |
67 | continue; | |
68 | fvalue *= 10; | |
69 | fvalue += devc->buf[i]; | |
70 | } | |
71 | fvalue /= 10; | |
72 | ||
73 | memset(&analog, 0, sizeof(struct sr_datafeed_analog)); | |
74 | analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL; | |
75 | analog.unit = SR_UNIT_DECIBEL_SPL; | |
ba7dd8bb | 76 | analog.channels = sdi->channels; |
a8d09e13 BV |
77 | analog.num_samples = 1; |
78 | analog.data = &fvalue; | |
79 | ||
80 | /* High nibble should only have 0x01 or 0x02. */ | |
81 | mode = (devc->buf[2] >> 4) & 0x0f; | |
82 | if (mode == 0x02) | |
83 | analog.mqflags |= SR_MQFLAG_HOLD; | |
84 | else if (mode != 0x01) { | |
85 | sr_dbg("unknown measurement mode 0x%.2x", mode); | |
86 | return; | |
87 | } | |
88 | ||
89 | /* Low nibble has 14 combinations of direct/long-term average, | |
90 | * time scale of that average, frequency weighting, and time | |
91 | * weighting. */ | |
92 | mode = devc->buf[2] & 0x0f; | |
93 | switch (mode) { | |
93b118da UH |
94 | case 0x0: |
95 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
96 | | SR_MQFLAG_SPL_TIME_WEIGHT_F; | |
97 | break; | |
98 | case 0x1: | |
99 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
100 | | SR_MQFLAG_SPL_TIME_WEIGHT_S; | |
101 | break; | |
102 | case 0x2: | |
103 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C \ | |
104 | | SR_MQFLAG_SPL_TIME_WEIGHT_F; | |
105 | break; | |
106 | case 0x3: | |
107 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C \ | |
108 | | SR_MQFLAG_SPL_TIME_WEIGHT_S; | |
109 | break; | |
110 | case 0x4: | |
111 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT \ | |
112 | | SR_MQFLAG_SPL_TIME_WEIGHT_F; | |
113 | break; | |
114 | case 0x5: | |
115 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT \ | |
116 | | SR_MQFLAG_SPL_TIME_WEIGHT_S; | |
117 | break; | |
118 | case 0x6: | |
119 | analog.mqflags |= SR_MQFLAG_SPL_PCT_OVER_ALARM \ | |
120 | | SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
121 | | SR_MQFLAG_SPL_TIME_WEIGHT_F; | |
122 | break; | |
123 | case 0x7: | |
124 | analog.mqflags |= SR_MQFLAG_SPL_PCT_OVER_ALARM \ | |
125 | | SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
126 | | SR_MQFLAG_SPL_TIME_WEIGHT_S; | |
127 | break; | |
128 | case 0x8: | |
129 | /* 10-second mean, but we don't have MQ flags to express it. */ | |
130 | analog.mqflags |= SR_MQFLAG_SPL_LAT \ | |
131 | | SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
132 | | SR_MQFLAG_SPL_TIME_WEIGHT_F; | |
133 | break; | |
134 | case 0x9: | |
135 | /* Mean over a time period between 11 seconds and 24 hours. | |
136 | * Which is so silly that there's no point in expressing | |
137 | * either this or the previous case. */ | |
138 | analog.mqflags |= SR_MQFLAG_SPL_LAT \ | |
139 | | SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
140 | | SR_MQFLAG_SPL_TIME_WEIGHT_F; | |
141 | break; | |
142 | case 0xa: | |
143 | /* 10-second mean. */ | |
144 | analog.mqflags |= SR_MQFLAG_SPL_LAT \ | |
145 | | SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
146 | | SR_MQFLAG_SPL_TIME_WEIGHT_S; | |
147 | break; | |
148 | case 0xb: | |
149 | /* Mean over a time period between 11 seconds and 24 hours. */ | |
150 | analog.mqflags |= SR_MQFLAG_SPL_LAT \ | |
151 | | SR_MQFLAG_SPL_FREQ_WEIGHT_A \ | |
152 | | SR_MQFLAG_SPL_TIME_WEIGHT_S; | |
153 | break; | |
154 | case 0xc: | |
155 | /* Internal calibration on 1kHz sine at 94dB, not useful | |
156 | * to anything but the device. */ | |
157 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT; | |
158 | break; | |
159 | case 0xd: | |
160 | /* Internal calibration on 1kHz sine at 94dB, not useful | |
161 | * to anything but the device. */ | |
162 | analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT; | |
163 | break; | |
164 | default: | |
165 | sr_dbg("unknown configuration 0x%.2x", mode); | |
166 | return; | |
a8d09e13 BV |
167 | } |
168 | ||
169 | packet.type = SR_DF_ANALOG; | |
170 | packet.payload = &analog; | |
171 | sr_session_send(devc->cb_data, &packet); | |
172 | ||
173 | devc->num_samples++; | |
9a10ce65 BV |
174 | if (devc->num_samples >= devc->limit_samples) |
175 | sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi, | |
176 | devc->cb_data); | |
a8d09e13 BV |
177 | |
178 | } | |
4d729ddc BV |
179 | |
180 | SR_PRIV int colead_slm_receive_data(int fd, int revents, void *cb_data) | |
181 | { | |
182 | const struct sr_dev_inst *sdi; | |
183 | struct dev_context *devc; | |
aa706635 | 184 | struct sr_serial_dev_inst *serial; |
9e6d9bee | 185 | int delay_ms, len; |
a8d09e13 | 186 | char buf[128]; |
4d729ddc | 187 | |
f306ca61 BV |
188 | (void)fd; |
189 | ||
4d729ddc BV |
190 | if (!(sdi = cb_data)) |
191 | return TRUE; | |
192 | ||
193 | if (!(devc = sdi->priv)) | |
194 | return TRUE; | |
195 | ||
a8d09e13 BV |
196 | if (revents != G_IO_IN) |
197 | /* Timeout event. */ | |
198 | return TRUE; | |
199 | ||
aa706635 | 200 | serial = sdi->conn; |
a8d09e13 | 201 | if (devc->state == IDLE) { |
c9fc06d7 | 202 | if (serial_read_nonblocking(serial, buf, 128) != 1 || buf[0] != 0x10) |
a8d09e13 BV |
203 | /* Nothing there, or caught the tail end of a previous packet, |
204 | * or some garbage. Unless it's a single "data ready" byte, | |
205 | * we don't want it. */ | |
206 | return TRUE; | |
207 | /* Got 0x10, "measurement ready". */ | |
9e6d9bee BV |
208 | delay_ms = serial_timeout(serial, 1); |
209 | if (serial_write_blocking(serial, "\x20", 1, delay_ms) < 1) | |
081c214e | 210 | sr_err("unable to send command"); |
a8d09e13 BV |
211 | else { |
212 | devc->state = COMMAND_SENT; | |
213 | devc->buflen = 0; | |
214 | } | |
215 | } else { | |
c9fc06d7 | 216 | len = serial_read_nonblocking(serial, devc->buf + devc->buflen, |
f306ca61 | 217 | 10 - devc->buflen); |
a8d09e13 BV |
218 | if (len < 1) |
219 | return TRUE; | |
220 | devc->buflen += len; | |
221 | if (devc->buflen > 10) { | |
222 | sr_dbg("buffer overrun"); | |
223 | devc->state = IDLE; | |
224 | return TRUE; | |
225 | } | |
226 | if (devc->buflen == 10) { | |
227 | /* If we got here, we're sure the device sent a "data ready" | |
228 | * notification, we asked for data, and got it. */ | |
229 | process_packet(sdi); | |
230 | devc->state = IDLE; | |
231 | } | |
4d729ddc BV |
232 | } |
233 | ||
234 | return TRUE; | |
235 | } |