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