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dev_acquisition_{start,stop}(): Drop duplicate 'cb_data' parameter.
[libsigrok.git] / src / hardware / motech-lps-30x / protocol.c
1 /*
2  * This file is part of the libsigrok project.
3  *
4  * Copyright (C) 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
5  * Copyright (C) 2014 Bert Vermeulen <bert@biot.com> (code from atten-pps3xxx)
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 /** @file
22  *  <em>Motech LPS-30x series</em> power supply driver
23  *  @internal
24  */
25
26 #include <config.h>
27 #include <errno.h>
28 #include <string.h>
29 #include "protocol.h"
30
31 /** Send data packets for current measurements. */
32 static void send_data(struct sr_dev_inst *sdi)
33 {
34         struct dev_context *devc;
35         struct sr_datafeed_packet packet;
36         struct sr_datafeed_analog_old analog;
37         int i;
38         float data[MAX_CHANNELS];
39
40         devc = sdi->priv;
41         packet.type = SR_DF_ANALOG_OLD;
42         packet.payload = &analog;
43         analog.channels = sdi->channels;
44         analog.num_samples = 1;
45
46         analog.mq = SR_MQ_VOLTAGE;
47         analog.unit = SR_UNIT_VOLT;
48         analog.mqflags = SR_MQFLAG_DC;
49         analog.data = data;
50         for (i = 0; i < devc->model->num_channels; i++)
51                 analog.data[i] = devc->channel_status[i].output_voltage_last; /* Value always 3.3 or 5 for channel 3, if present! */
52         sr_session_send(sdi, &packet);
53
54         analog.mq = SR_MQ_CURRENT;
55         analog.unit = SR_UNIT_AMPERE;
56         analog.mqflags = 0;
57         analog.data = data;
58         for (i = 0; i < devc->model->num_channels; i++)
59                 analog.data[i] = devc->channel_status[i].output_current_last; /* Value always 0 for channel 3, if present! */
60         sr_session_send(sdi, &packet);
61
62         devc->num_samples++;
63 }
64
65 /** Process a complete line (without CR/LF) in buf. */
66 static void process_line(struct sr_dev_inst *sdi)
67 {
68         struct dev_context *devc;
69         double dbl;
70         int auxint;
71
72         devc = sdi->priv;
73
74         switch (devc->acq_req_pending) {
75         case 0: /* Should not happen... */
76                 break;
77         case 1: /* Waiting for data reply to request */
78                 /* Convert numbers */
79                 switch (devc->acq_req) {
80                 case AQ_U1:
81                 case AQ_U2:
82                 case AQ_I1:
83                 case AQ_I2:
84                         if (sr_atod(devc->buf, &dbl) != SR_OK) {
85                                 sr_err("Failed to convert '%s' to double, errno=%d %s",
86                                         devc->buf, errno, g_strerror(errno));
87                                 dbl = 0.0;
88                         }
89                         break;
90                 case AQ_STATUS:
91                         if (sr_atoi(devc->buf, &auxint) != SR_OK) {
92                                 sr_err("Failed to convert '%s' to int, errno=%d %s",
93                                         devc->buf, errno, g_strerror(errno));
94                                 auxint = 0;
95                         }
96                         break;
97                 default:
98                         break;
99                 }
100
101                 switch (devc->acq_req) {
102                 case AQ_U1:
103                         devc->channel_status[0].output_voltage_last = dbl;
104                         break;
105                 case AQ_I1:
106                         devc->channel_status[0].output_current_last = dbl;
107                         break;
108                 case AQ_U2:
109                         devc->channel_status[1].output_voltage_last = dbl;
110                         break;
111                 case AQ_I2:
112                         devc->channel_status[1].output_current_last = dbl;
113                         break;
114                 case AQ_STATUS: /* Process status and generate data. */
115                         if (lps_process_status(sdi, auxint) == SR_OK) {
116                                 send_data(sdi);
117                         }
118                         break;
119                 default:
120                         break;
121                 }
122
123                 devc->acq_req_pending = 2;
124                 break;
125         case 2: /* Waiting for OK after request */
126                 if (strcmp(devc->buf, "OK")) {
127                         sr_err("Unexpected reply while waiting for OK: '%s'", devc->buf);
128                 }
129                 devc->acq_req_pending = 0;
130                 break;
131         }
132
133         devc->buf[0] = '\0';
134         devc->buflen = 0;
135 }
136
137 SR_PRIV int motech_lps_30x_receive_data(int fd, int revents, void *cb_data)
138 {
139         struct sr_dev_inst *sdi;
140         struct dev_context *devc;
141         struct sr_serial_dev_inst *serial;
142         int len;
143         gdouble elapsed_s;
144
145         (void)fd;
146
147         if (!(sdi = cb_data))
148                 return TRUE;
149
150         if (!(devc = sdi->priv))
151                 return TRUE;
152
153         serial = sdi->conn;
154
155         if (revents == G_IO_IN) { /* Serial data arrived. */
156                 while (LINELEN_MAX - devc->buflen - 2 > 0) {
157                         len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
158                         if (len < 1)
159                                 break;
160
161                         /* Eliminate whitespace at beginning of line. */
162                         if (g_ascii_isspace(devc->buf[0])) {
163                                 devc->buf[0] = '\0';
164                                 devc->buflen = 0;
165                                 continue;
166                         }
167
168                         devc->buflen += len;
169                         devc->buf[devc->buflen] = '\0';
170
171                         /* If line complete, process msg. */
172                         if ((devc->buflen > 0) && ((devc->buf[devc->buflen-1] == '\r') || devc->buf[devc->buflen-1] == '\n')) {
173                                 devc->buflen--;
174                                 devc->buf[devc->buflen] = '\0';
175
176                                 sr_spew("Line complete: \"%s\"", devc->buf);
177                                 process_line(sdi);
178                         }
179                 }
180         }
181
182         /* If number of samples or time limit reached, stop acquisition. */
183         if (devc->limit_samples && (devc->num_samples >= devc->limit_samples))
184                 sdi->driver->dev_acquisition_stop(sdi);
185
186         if (devc->limit_msec) {
187                 elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
188                 if ((elapsed_s * 1000) >= devc->limit_msec)
189                         sdi->driver->dev_acquisition_stop(sdi);
190         }
191
192         /* Only request the next packet if required. */
193         if (!((sdi->status == SR_ST_ACTIVE) && (devc->acq_running)))
194                 return TRUE;
195
196         if (devc->acq_req_pending) {
197                 int64_t elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
198                 if (elapsed_us > (REQ_TIMEOUT_MS * 1000)) {
199                         sr_spew("Request timeout: req=%d t=%" PRIi64 "us",
200                                 (int)devc->acq_req, elapsed_us);
201                         devc->acq_req_pending = 0;
202                 }
203         }
204
205         if (devc->acq_req_pending == 0) {
206                 switch (devc->acq_req) {
207                 case AQ_NONE: /* Fall through */
208                 case AQ_STATUS:
209                         devc->acq_req = AQ_U1;
210                         lps_send_req(serial, "VOUT1");
211                         break;
212                 case AQ_U1:
213                         devc->acq_req = AQ_I1;
214                         lps_send_req(serial, "IOUT1");
215                         break;
216                 case AQ_I1:
217                         if (devc->model->num_channels == 1) {
218                                 devc->acq_req = AQ_STATUS;
219                                 lps_send_req(serial, "STATUS");
220                         } else {
221                                 devc->acq_req = AQ_U2;
222                                 lps_send_req(serial, "VOUT2");
223                         }
224                         break;
225                 case AQ_U2:
226                         devc->acq_req = AQ_I2;
227                         lps_send_req(serial, "IOUT2");
228                         break;
229                 case AQ_I2:
230                         devc->acq_req = AQ_STATUS;
231                         lps_send_req(serial, "STATUS");
232                         break;
233                 default:
234                         sr_err("Illegal devc->acq_req=%d", devc->acq_req);
235                         return SR_ERR;
236                 }
237                 devc->req_sent_at = g_get_real_time();
238                 devc->acq_req_pending = 1;
239         }
240
241         return TRUE;
242 }