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 analog;
  37         struct sr_analog_encoding encoding;
  38         struct sr_analog_meaning meaning;
  39         struct sr_analog_spec spec;
  40         int i;
  41         float data[MAX_CHANNELS];
  42
  43         devc = sdi->priv;
  44         packet.type = SR_DF_ANALOG;
  45         packet.payload = &analog;
  46
  47         /* Note: digits/spec_digits will be overridden later. */
  48         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
  49
  50         analog.meaning->channels = sdi->channels;
  51         analog.num_samples = 1;
  52         analog.meaning->mq = SR_MQ_VOLTAGE;
  53         analog.meaning->unit = SR_UNIT_VOLT;
  54         analog.meaning->mqflags = SR_MQFLAG_DC;
  55         analog.encoding->digits = 3;
  56         analog.spec->spec_digits = 2;
  57         analog.data = data;
  58
  59         for (i = 0; i < devc->model->num_channels; i++)
  60                 ((float *)analog.data)[i] = devc->channel_status[i].output_voltage_last; /* Value always 3.3 or 5 for channel 3, if present! */
  61         sr_session_send(sdi, &packet);
  62
  63         analog.meaning->mq = SR_MQ_CURRENT;
  64         analog.meaning->unit = SR_UNIT_AMPERE;
  65         analog.meaning->mqflags = 0;
  66         analog.encoding->digits = 4;
  67         analog.spec->spec_digits = 3;
  68         analog.data = data;
  69         for (i = 0; i < devc->model->num_channels; i++)
  70                 ((float *)analog.data)[i] = devc->channel_status[i].output_current_last; /* Value always 0 for channel 3, if present! */
  71         sr_session_send(sdi, &packet);
  72
  73         sr_sw_limits_update_samples_read(&devc->limits, 1);
  74 }
  75
  76 /** Process a complete line (without CR/LF) in buf. */
  77 static void process_line(struct sr_dev_inst *sdi)
  78 {
  79         struct dev_context *devc;
  80         double dbl;
  81         int auxint;
  82
  83         devc = sdi->priv;
  84
  85         switch (devc->acq_req_pending) {
  86         case 0: /* Should not happen... */
  87                 break;
  88         case 1: /* Waiting for data reply to request */
  89                 /* Convert numbers */
  90                 switch (devc->acq_req) {
  91                 case AQ_U1:
  92                 case AQ_U2:
  93                 case AQ_I1:
  94                 case AQ_I2:
  95                         if (sr_atod(devc->buf, &dbl) != SR_OK) {
  96                                 sr_err("Failed to convert '%s' to double, errno=%d %s",
  97                                         devc->buf, errno, g_strerror(errno));
  98                                 dbl = 0.0;
  99                         }
 100                         break;
 101                 case AQ_STATUS:
 102                         if (sr_atoi(devc->buf, &auxint) != SR_OK) {
 103                                 sr_err("Failed to convert '%s' to int, errno=%d %s",
 104                                         devc->buf, errno, g_strerror(errno));
 105                                 auxint = 0;
 106                         }
 107                         break;
 108                 default:
 109                         break;
 110                 }
 111
 112                 switch (devc->acq_req) {
 113                 case AQ_U1:
 114                         devc->channel_status[0].output_voltage_last = dbl;
 115                         break;
 116                 case AQ_I1:
 117                         devc->channel_status[0].output_current_last = dbl;
 118                         break;
 119                 case AQ_U2:
 120                         devc->channel_status[1].output_voltage_last = dbl;
 121                         break;
 122                 case AQ_I2:
 123                         devc->channel_status[1].output_current_last = dbl;
 124                         break;
 125                 case AQ_STATUS: /* Process status and generate data. */
 126                         if (lps_process_status(sdi, auxint) == SR_OK) {
 127                                 send_data(sdi);
 128                         }
 129                         break;
 130                 default:
 131                         break;
 132                 }
 133
 134                 devc->acq_req_pending = 2;
 135                 break;
 136         case 2: /* Waiting for OK after request */
 137                 if (strcmp(devc->buf, "OK")) {
 138                         sr_err("Unexpected reply while waiting for OK: '%s'", devc->buf);
 139                 }
 140                 devc->acq_req_pending = 0;
 141                 break;
 142         }
 143
 144         devc->buf[0] = '\0';
 145         devc->buflen = 0;
 146 }
 147
 148 SR_PRIV int motech_lps_30x_receive_data(int fd, int revents, void *cb_data)
 149 {
 150         struct sr_dev_inst *sdi;
 151         struct dev_context *devc;
 152         struct sr_serial_dev_inst *serial;
 153         int len;
 154
 155         (void)fd;
 156
 157         if (!(sdi = cb_data))
 158                 return TRUE;
 159
 160         if (!(devc = sdi->priv))
 161                 return TRUE;
 162
 163         serial = sdi->conn;
 164
 165         if (revents == G_IO_IN) { /* Serial data arrived. */
 166                 while (LINELEN_MAX - devc->buflen - 2 > 0) {
 167                         len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
 168                         if (len < 1)
 169                                 break;
 170
 171                         /* Eliminate whitespace at beginning of line. */
 172                         if (g_ascii_isspace(devc->buf[0])) {
 173                                 devc->buf[0] = '\0';
 174                                 devc->buflen = 0;
 175                                 continue;
 176                         }
 177
 178                         devc->buflen += len;
 179                         devc->buf[devc->buflen] = '\0';
 180
 181                         /* If line complete, process msg. */
 182                         if ((devc->buflen > 0) && ((devc->buf[devc->buflen-1] == '\r') || devc->buf[devc->buflen-1] == '\n')) {
 183                                 devc->buflen--;
 184                                 devc->buf[devc->buflen] = '\0';
 185
 186                                 sr_spew("Line complete: \"%s\"", devc->buf);
 187                                 process_line(sdi);
 188                         }
 189                 }
 190         }
 191
 192         if (sr_sw_limits_check(&devc->limits))
 193                 sdi->driver->dev_acquisition_stop(sdi);
 194
 195         /* Only request the next packet if required. */
 196         if (!((sdi->status == SR_ST_ACTIVE) && (devc->acq_running)))
 197                 return TRUE;
 198
 199         if (devc->acq_req_pending) {
 200                 int64_t elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
 201                 if (elapsed_us > (REQ_TIMEOUT_MS * 1000)) {
 202                         sr_spew("Request timeout: req=%d t=%" PRIi64 "us",
 203                                 (int)devc->acq_req, elapsed_us);
 204                         devc->acq_req_pending = 0;
 205                 }
 206         }
 207
 208         if (devc->acq_req_pending == 0) {
 209                 switch (devc->acq_req) {
 210                 case AQ_NONE: /* Fall through */
 211                 case AQ_STATUS:
 212                         devc->acq_req = AQ_U1;
 213                         lps_send_req(serial, "VOUT1");
 214                         break;
 215                 case AQ_U1:
 216                         devc->acq_req = AQ_I1;
 217                         lps_send_req(serial, "IOUT1");
 218                         break;
 219                 case AQ_I1:
 220                         if (devc->model->num_channels == 1) {
 221                                 devc->acq_req = AQ_STATUS;
 222                                 lps_send_req(serial, "STATUS");
 223                         } else {
 224                                 devc->acq_req = AQ_U2;
 225                                 lps_send_req(serial, "VOUT2");
 226                         }
 227                         break;
 228                 case AQ_U2:
 229                         devc->acq_req = AQ_I2;
 230                         lps_send_req(serial, "IOUT2");
 231                         break;
 232                 case AQ_I2:
 233                         devc->acq_req = AQ_STATUS;
 234                         lps_send_req(serial, "STATUS");
 235                         break;
 236                 default:
 237                         sr_err("Illegal devc->acq_req=%d", devc->acq_req);
 238                         return SR_ERR;
 239                 }
 240                 devc->req_sent_at = g_get_real_time();
 241                 devc->acq_req_pending = 1;
 242         }
 243
 244         return TRUE;
 245 }