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
  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 analog;
  37         int i;
  38         float data[MAX_CHANNELS];
  39
  40         devc = sdi->priv;
  41         packet.type = SR_DF_ANALOG;
  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:  case AQ_U2:  case AQ_I1:  case AQ_I2:
  81                         if (sr_atod(devc->buf, &dbl) != SR_OK) {
  82                                 sr_err("Failed to convert '%s' to double, errno=%d %s",
  83                                         devc->buf, errno, strerror(errno));
  84                                 dbl = 0.0;
  85                         }
  86                         break;
  87                 case AQ_STATUS:
  88                         if (sr_atoi(devc->buf, &auxint) != SR_OK) {
  89                                 sr_err("Failed to convert '%s' to int, errno=%d %s",
  90                                         devc->buf, errno, strerror(errno));
  91                                 auxint = 0;
  92                         }
  93                         break;
  94                 default:
  95                         break;
  96                 }
  97
  98                 switch (devc->acq_req) {
  99                 case AQ_U1:
 100                         devc->channel_status[0].output_voltage_last = dbl;
 101                         break;
 102                 case AQ_I1:
 103                         devc->channel_status[0].output_current_last = dbl;
 104                         break;
 105                 case AQ_U2:
 106                         devc->channel_status[1].output_voltage_last = dbl;
 107                         break;
 108                 case AQ_I2:
 109                         devc->channel_status[1].output_current_last = dbl;
 110                         break;
 111                 case AQ_STATUS: /* Process status and generate data. */
 112                         if (lps_process_status(sdi, auxint) == SR_OK) {
 113                                 send_data(sdi);
 114                         }
 115                         break;
 116                 default:
 117                         break;
 118                 }
 119
 120                 devc->acq_req_pending = 2;
 121                 break;
 122         case 2: /* Waiting for OK after request */
 123                 if (strcmp(devc->buf, "OK")) {
 124                         sr_err("Unexpected reply while waiting for OK: '%s'", devc->buf);
 125                 }
 126                 devc->acq_req_pending = 0;
 127                 break;
 128         }
 129
 130         devc->buf[0] = '\0';
 131         devc->buflen = 0;
 132 }
 133
 134
 135 SR_PRIV int motech_lps_30x_receive_data(int fd, int revents, void *cb_data)
 136 {
 137         struct sr_dev_inst *sdi;
 138         struct dev_context *devc;
 139         struct sr_serial_dev_inst *serial;
 140         int len;
 141         gdouble elapsed_s;
 142
 143         (void)fd;
 144
 145         if (!(sdi = cb_data))
 146                 return TRUE;
 147
 148         if (!(devc = sdi->priv))
 149                 return TRUE;
 150
 151         serial = sdi->conn;
 152
 153         if (revents == G_IO_IN) { /* Serial data arrived. */
 154                 while (LINELEN_MAX - devc->buflen - 2 > 0) {
 155                         len = serial_read(serial, devc->buf + devc->buflen, 1);
 156                         if (len < 1)
 157                                 break;
 158
 159                         /* Eliminate whitespace at beginning of line. */
 160                         if (g_ascii_isspace(devc->buf[0])) {
 161                                 devc->buf[0] = '\0';
 162                                 devc->buflen = 0;
 163                                 continue;
 164                         }
 165
 166                         devc->buflen += len;
 167                         devc->buf[devc->buflen] = '\0';
 168
 169                         /* If line complete, process msg. */
 170                         if ((devc->buflen > 0) && ((devc->buf[devc->buflen-1] == '\r') || devc->buf[devc->buflen-1] == '\n')) {
 171                                 devc->buflen--;
 172                                 devc->buf[devc->buflen] = '\0';
 173
 174                                 sr_spew("Line complete: \"%s\"", devc->buf);
 175                                 process_line(sdi);
 176                         }
 177                 }
 178         }
 179
 180         /* If number of samples or time limit reached, stop acquisition. */
 181         if (devc->limit_samples && (devc->num_samples >= devc->limit_samples))
 182                 sdi->driver->dev_acquisition_stop(sdi, cb_data);
 183
 184         if (devc->limit_msec) {
 185                 elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
 186                 if ((elapsed_s * 1000) >= devc->limit_msec)
 187                         sdi->driver->dev_acquisition_stop(sdi, cb_data);
 188         }
 189
 190         /* Request next packet, if required. */
 191         if ((sdi->status == SR_ST_ACTIVE) && (devc->acq_running)){
 192                 if (devc->acq_req_pending) {
 193                         gint64 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
 194                         if (elapsed_us > (REQ_TIMEOUT_MS * 1000)) {
 195                                 sr_spew("Request timeout: req=%d t=%lldus", (int)devc->acq_req, elapsed_us);
 196                                 devc->acq_req_pending = 0;
 197                         }
 198                 }
 199                 if (devc->acq_req_pending == 0) {
 200                         switch(devc->acq_req)
 201                         {
 202                         case AQ_NONE: /* Fall through */
 203                         case AQ_STATUS:
 204                                 devc->acq_req = AQ_U1;
 205                                 lps_send_req(serial, "VOUT1");
 206                                 break;
 207                         case AQ_U1:
 208                                 devc->acq_req = AQ_I1;
 209                                 lps_send_req(serial, "IOUT1");
 210                                 break;
 211                         case AQ_I1:
 212                                 if (devc->model->num_channels == 1) {
 213                                         devc->acq_req = AQ_STATUS;
 214                                         lps_send_req(serial, "STATUS");
 215                                 } else {
 216                                         devc->acq_req = AQ_U2;
 217                                         lps_send_req(serial, "VOUT2");
 218                                 }
 219                                 break;
 220                         case AQ_U2:
 221                                 devc->acq_req = AQ_I2;
 222                                 lps_send_req(serial, "IOUT2");
 223                                 break;
 224                         case AQ_I2:
 225                                 devc->acq_req = AQ_STATUS;
 226                                 lps_send_req(serial, "STATUS");
 227                                 break;
 228                         default:
 229                                 sr_err("Illegal devc->acq_req=%d", devc->acq_req);
 230                                 return SR_ERR;
 231                         }
 232                         devc->req_sent_at = g_get_real_time();
 233                         devc->acq_req_pending = 1;
 234                 }
 235         }
 236
 237         return TRUE;
 238 }