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cem-dt-885x: Hold off measurements in max/min hold mode
[libsigrok.git] / hardware / cem-dt-885x / protocol.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2013 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 <string.h>
21 #include "protocol.h"
22
23 /* Length of expected payload for each token. */
24 static int token_payloads[][2] = {
25         { TOKEN_WEIGHT_TIME_FAST, 0 },
26         { TOKEN_WEIGHT_TIME_SLOW, 0 },
27         { TOKEN_HOLD_MAX, 0 },
28         { TOKEN_HOLD_MIN, 0 },
29         { TOKEN_TIME, 3 },
30         { TOKEN_MEAS_RANGE_OVER, 0 },
31         { TOKEN_MEAS_RANGE_UNDER, 0 },
32         { TOKEN_STORE_FULL, 0 },
33         { TOKEN_RECORDING_ON, 0 },
34         { TOKEN_MEAS_WAS_READOUT, 1 },
35         { TOKEN_MEAS_WAS_BARGRAPH, 0 },
36         { TOKEN_MEASUREMENT, 2 },
37         { TOKEN_HOLD_NONE, 0 },
38         { TOKEN_BATTERY_LOW, 0 },
39         { TOKEN_MEAS_RANGE_OK, 0 },
40         { TOKEN_STORE_OK, 0 },
41         { TOKEN_RECORDING_OFF, 0 },
42         { TOKEN_WEIGHT_FREQ_A, 1 },
43         { TOKEN_WEIGHT_FREQ_C, 1 },
44         { TOKEN_BATTERY_OK, 0 },
45         { TOKEN_MEAS_RANGE_30_80, 0 },
46         { TOKEN_MEAS_RANGE_30_130, 0 },
47         { TOKEN_MEAS_RANGE_50_100, 0 },
48         { TOKEN_MEAS_RANGE_80_130, 0 },
49 };
50
51 static int find_token_payload_len(unsigned char c)
52 {
53         unsigned int i;
54
55         for (i = 0; i < ARRAY_SIZE(token_payloads); i++) {
56                 if (token_payloads[i][0] == c)
57                         return token_payloads[i][1];
58         }
59
60         return -1;
61 }
62
63 /* Process measurement or setting (0xa5 command). */
64 static void process_mset(const struct sr_dev_inst *sdi)
65 {
66         struct dev_context *devc;
67         struct sr_datafeed_packet packet;
68         struct sr_datafeed_analog analog;
69         GString *dbg;
70         float fvalue;
71         int i;
72
73         devc = sdi->priv;
74         if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
75                 dbg = g_string_sized_new(128);
76                 g_string_printf(dbg, "got command 0x%.2x token 0x%.2x",
77                                 devc->cmd, devc->token);
78                 if (devc->buf_len) {
79                         g_string_append_printf(dbg, " payload");
80                         for (i = 0; i < devc->buf_len; i++)
81                                 g_string_append_printf(dbg, " %.2x", devc->buf[i]);
82                 }
83                 sr_spew("%s", dbg->str);
84                 g_string_free(dbg, TRUE);
85         }
86
87         switch(devc->token) {
88         case TOKEN_WEIGHT_TIME_FAST:
89                 devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
90                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_S;
91                 break;
92         case TOKEN_WEIGHT_TIME_SLOW:
93                 devc->cur_mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
94                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_TIME_WEIGHT_F;
95                 break;
96         case TOKEN_WEIGHT_FREQ_A:
97                 devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
98                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_C;
99                 break;
100         case TOKEN_WEIGHT_FREQ_C:
101                 devc->cur_mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
102                 devc->cur_mqflags &= ~SR_MQFLAG_SPL_FREQ_WEIGHT_A;
103                 break;
104         case TOKEN_HOLD_MAX:
105                 devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MAX;
106                 devc->cur_mqflags &= ~SR_MQFLAG_MIN;
107                 break;
108         case TOKEN_HOLD_MIN:
109                 devc->cur_mqflags |= SR_MQFLAG_HOLD | SR_MQFLAG_MIN;
110                 devc->cur_mqflags &= ~SR_MQFLAG_MAX;
111                 break;
112         case TOKEN_HOLD_NONE:
113                 devc->cur_mqflags &= ~(SR_MQFLAG_MAX | SR_MQFLAG_MIN | SR_MQFLAG_HOLD);
114                 break;
115         case TOKEN_MEASUREMENT:
116                 fvalue = ((devc->buf[0] & 0xf0) >> 4) * 100;
117                 fvalue += (devc->buf[0] & 0x0f) * 10;
118                 fvalue += ((devc->buf[1] & 0xf0) >> 4);
119                 fvalue += (devc->buf[1] & 0x0f) / 10.0;
120                 devc->last_spl = fvalue;
121                 break;
122         case TOKEN_MEAS_WAS_READOUT:
123         case TOKEN_MEAS_WAS_BARGRAPH:
124                 if (devc->cur_mqflags & (SR_MQFLAG_MAX | SR_MQFLAG_MIN)) {
125                         if (devc->token == TOKEN_MEAS_WAS_BARGRAPH) {
126                                 /* The device still sends bargraph measurements even
127                                  * when in max/min hold mode. Suppress them here, unless
128                                  * they're readout values. This duplicates the behavior
129                                  * of the device display exactly. */
130                                 break;
131                         }
132                 }
133                 memset(&analog, 0, sizeof(struct sr_datafeed_analog));
134                 analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
135                 analog.mqflags = devc->cur_mqflags;
136                 analog.unit = SR_UNIT_DECIBEL_SPL;
137                 analog.probes = sdi->probes;
138                 analog.num_samples = 1;
139                 analog.data = &devc->last_spl;
140                 packet.type = SR_DF_ANALOG;
141                 packet.payload = &analog;
142                 sr_session_send(devc->cb_data, &packet);
143
144                 devc->num_samples++;
145                 if (devc->limit_samples && devc->num_samples >= devc->limit_samples)
146                         sdi->driver->dev_acquisition_stop((struct sr_dev_inst *)sdi,
147                                         devc->cb_data);
148                 break;
149         case TOKEN_TIME:
150         case TOKEN_STORE_OK:
151         case TOKEN_STORE_FULL:
152         case TOKEN_RECORDING_ON:
153         case TOKEN_RECORDING_OFF:
154         case TOKEN_BATTERY_OK:
155         case TOKEN_BATTERY_LOW:
156         case TOKEN_MEAS_RANGE_OK:
157         case TOKEN_MEAS_RANGE_OVER:
158         case TOKEN_MEAS_RANGE_UNDER:
159         case TOKEN_MEAS_RANGE_30_80:
160         case TOKEN_MEAS_RANGE_30_130:
161         case TOKEN_MEAS_RANGE_50_100:
162         case TOKEN_MEAS_RANGE_80_130:
163                 /* Not useful, or not expressable in sigrok. */
164                 break;
165         }
166
167 }
168
169 static void process_byte(const struct sr_dev_inst *sdi, const unsigned char c)
170 {
171         struct dev_context *devc;
172         int len;
173
174         if (!(devc = sdi->priv))
175                 return;
176
177         if (c == 0xff) {
178                 /* Device is in hold mode */
179                 devc->cur_mqflags |= SR_MQFLAG_HOLD;
180
181                 /* TODO: send out the last measurement at the same
182                  * rate as it normally gets sent */
183
184                 /* When the device leaves hold mode, it starts from scratch. */
185                 devc->state = ST_INIT;
186                 return;
187         }
188         devc->cur_mqflags &= ~SR_MQFLAG_HOLD;
189
190         if (devc->state == ST_INIT) {
191                 if (c == 0xa5) {
192                         devc->cmd = c;
193                         devc->token = 0x00;
194                         devc->state = ST_GET_TOKEN;
195                 } else if (c == 0xbb) {
196                         devc->cmd = c;
197                         devc->buf_len = 0;
198                         devc->state = ST_GET_LOG;
199                 }
200         } else if (devc->state == ST_GET_TOKEN) {
201                 devc->token = c;
202                 devc->buf_len = 0;
203                 len = find_token_payload_len(devc->token);
204                 if (len == -1 || len > 0) {
205                         devc->buf_len = 0;
206                         devc->state = ST_GET_DATA;
207                 } else {
208                         process_mset(sdi);
209                         devc->state = ST_INIT;
210                 }
211         } else if (devc->state == ST_GET_DATA) {
212                 len = find_token_payload_len(devc->token);
213                 if (len == -1) {
214                         /* We don't know this token. */
215                         sr_dbg("Unknown 0xa5 token 0x%.2x", devc->token);
216                         if (c == 0xa5 || c == 0xbb) {
217                                 /* Looks like a new command however. */
218                                 process_mset(sdi);
219                                 devc->state = ST_INIT;
220                         } else {
221                                 devc->buf[devc->buf_len++] = c;
222                                 if (devc->buf_len > BUF_SIZE) {
223                                         /* Shouldn't happen, ignore. */
224                                         devc->state = ST_INIT;
225                                 }
226                         }
227                 } else {
228                         devc->buf[devc->buf_len++] = c;
229                         if (devc->buf_len == len) {
230                                 process_mset(sdi);
231                                 devc->state = ST_INIT;
232                         } else if (devc->buf_len > BUF_SIZE) {
233                                 /* Shouldn't happen, ignore. */
234                                 devc->state = ST_INIT;
235                         }
236                 }
237         } else if (devc->state == ST_GET_LOG) {
238         }
239
240 }
241
242 SR_PRIV int cem_dt_885x_receive_data(int fd, int revents, void *cb_data)
243 {
244         const struct sr_dev_inst *sdi;
245         struct sr_serial_dev_inst *serial;
246         unsigned char c;
247
248         (void)fd;
249
250         if (!(sdi = cb_data))
251                 return TRUE;
252
253         serial = sdi->conn;
254         if (revents == G_IO_IN) {
255                 if (serial_read(serial, &c, 1) != 1)
256                         return TRUE;
257                 process_byte(sdi, c);
258         }
259
260         return TRUE;
261 }