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