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 /**
  22  * @file
  23  *
  24  * <em>Motech LPS-30x series</em> power supply driver
  25  *
  26  * @internal
  27  */
  28
  29 #include <config.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include "protocol.h"
  33
  34 /** Send data packets for current measurements. */
  35 static void send_data(struct sr_dev_inst *sdi)
  36 {
  37         struct dev_context *devc;
  38         struct sr_datafeed_packet packet;
  39         struct sr_datafeed_analog analog;
  40         struct sr_analog_encoding encoding;
  41         struct sr_analog_meaning meaning;
  42         struct sr_analog_spec spec;
  43         int i;
  44         float data[MAX_CHANNELS];
  45
  46         devc = sdi->priv;
  47         packet.type = SR_DF_ANALOG;
  48         packet.payload = &analog;
  49
  50         /* Note: digits/spec_digits will be overridden later. */
  51         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
  52
  53         analog.meaning->channels = sdi->channels;
  54         analog.num_samples = 1;
  55         analog.meaning->mq = SR_MQ_VOLTAGE;
  56         analog.meaning->unit = SR_UNIT_VOLT;
  57         analog.meaning->mqflags = SR_MQFLAG_DC;
  58         analog.encoding->digits = 3;
  59         analog.spec->spec_digits = 2;
  60         analog.data = data;
  61
  62         for (i = 0; i < devc->model->num_channels; i++)
  63                 ((float *)analog.data)[i] = devc->channel_status[i].output_voltage_last; /* Value always 3.3 or 5 for channel 3, if present! */
  64         sr_session_send(sdi, &packet);
  65
  66         analog.meaning->mq = SR_MQ_CURRENT;
  67         analog.meaning->unit = SR_UNIT_AMPERE;
  68         analog.meaning->mqflags = 0;
  69         analog.encoding->digits = 4;
  70         analog.spec->spec_digits = 3;
  71         analog.data = data;
  72         for (i = 0; i < devc->model->num_channels; i++)
  73                 ((float *)analog.data)[i] = devc->channel_status[i].output_current_last; /* Value always 0 for channel 3, if present! */
  74         sr_session_send(sdi, &packet);
  75
  76         sr_sw_limits_update_samples_read(&devc->limits, 1);
  77 }
  78
  79 /** Process a complete line (without CR/LF) in buf. */
  80 static void process_line(struct sr_dev_inst *sdi)
  81 {
  82         struct dev_context *devc;
  83         double dbl;
  84         int auxint;
  85
  86         devc = sdi->priv;
  87
  88         switch (devc->acq_req_pending) {
  89         case 0: /* Should not happen... */
  90                 break;
  91         case 1: /* Waiting for data reply to request */
  92                 /* Convert numbers */
  93                 switch (devc->acq_req) {
  94                 case AQ_U1:
  95                 case AQ_U2:
  96                 case AQ_I1:
  97                 case AQ_I2:
  98                         if (sr_atod(devc->buf, &dbl) != SR_OK) {
  99                                 sr_err("Failed to convert '%s' to double, errno=%d %s",
 100                                         devc->buf, errno, g_strerror(errno));
 101                                 dbl = 0.0;
 102                         }
 103                         break;
 104                 case AQ_STATUS:
 105                         if (sr_atoi(devc->buf, &auxint) != SR_OK) {
 106                                 sr_err("Failed to convert '%s' to int, errno=%d %s",
 107                                         devc->buf, errno, g_strerror(errno));
 108                                 auxint = 0;
 109                         }
 110                         break;
 111                 default:
 112                         break;
 113                 }
 114
 115                 switch (devc->acq_req) {
 116                 case AQ_U1:
 117                         devc->channel_status[0].output_voltage_last = dbl;
 118                         break;
 119                 case AQ_I1:
 120                         devc->channel_status[0].output_current_last = dbl;
 121                         break;
 122                 case AQ_U2:
 123                         devc->channel_status[1].output_voltage_last = dbl;
 124                         break;
 125                 case AQ_I2:
 126                         devc->channel_status[1].output_current_last = dbl;
 127                         break;
 128                 case AQ_STATUS: /* Process status and generate data. */
 129                         if (lps_process_status(sdi, auxint) == SR_OK) {
 130                                 send_data(sdi);
 131                         }
 132                         break;
 133                 default:
 134                         break;
 135                 }
 136
 137                 devc->acq_req_pending = 2;
 138                 break;
 139         case 2: /* Waiting for OK after request */
 140                 if (strcmp(devc->buf, "OK")) {
 141                         sr_err("Unexpected reply while waiting for OK: '%s'", devc->buf);
 142                 }
 143                 devc->acq_req_pending = 0;
 144                 break;
 145         }
 146
 147         devc->buf[0] = '\0';
 148         devc->buflen = 0;
 149 }
 150
 151 SR_PRIV int motech_lps_30x_receive_data(int fd, int revents, void *cb_data)
 152 {
 153         struct sr_dev_inst *sdi;
 154         struct dev_context *devc;
 155         struct sr_serial_dev_inst *serial;
 156         int len;
 157
 158         (void)fd;
 159
 160         if (!(sdi = cb_data))
 161                 return TRUE;
 162
 163         if (!(devc = sdi->priv))
 164                 return TRUE;
 165
 166         serial = sdi->conn;
 167
 168         if (revents == G_IO_IN) { /* Serial data arrived. */
 169                 while (LINELEN_MAX - devc->buflen - 2 > 0) {
 170                         len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
 171                         if (len < 1)
 172                                 break;
 173
 174                         /* Eliminate whitespace at beginning of line. */
 175                         if (g_ascii_isspace(devc->buf[0])) {
 176                                 devc->buf[0] = '\0';
 177                                 devc->buflen = 0;
 178                                 continue;
 179                         }
 180
 181                         devc->buflen += len;
 182                         devc->buf[devc->buflen] = '\0';
 183
 184                         /* If line complete, process msg. */
 185                         if ((devc->buflen > 0) && ((devc->buf[devc->buflen-1] == '\r') || devc->buf[devc->buflen-1] == '\n')) {
 186                                 devc->buflen--;
 187                                 devc->buf[devc->buflen] = '\0';
 188
 189                                 sr_spew("Line complete: \"%s\"", devc->buf);
 190                                 process_line(sdi);
 191                         }
 192                 }
 193         }
 194
 195         if (sr_sw_limits_check(&devc->limits))
 196                 sdi->driver->dev_acquisition_stop(sdi);
 197
 198         /* Only request the next packet if required. */
 199         if (!((sdi->status == SR_ST_ACTIVE) && (devc->acq_running)))
 200                 return TRUE;
 201
 202         if (devc->acq_req_pending) {
 203                 int64_t elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
 204                 if (elapsed_us > (REQ_TIMEOUT_MS * 1000)) {
 205                         sr_spew("Request timeout: req=%d t=%" PRIi64 "us",
 206                                 (int)devc->acq_req, elapsed_us);
 207                         devc->acq_req_pending = 0;
 208                 }
 209         }
 210
 211         if (devc->acq_req_pending == 0) {
 212                 switch (devc->acq_req) {
 213                 case AQ_NONE: /* Fall through */
 214                 case AQ_STATUS:
 215                         devc->acq_req = AQ_U1;
 216                         lps_send_req(serial, "VOUT1");
 217                         break;
 218                 case AQ_U1:
 219                         devc->acq_req = AQ_I1;
 220                         lps_send_req(serial, "IOUT1");
 221                         break;
 222                 case AQ_I1:
 223                         if (devc->model->num_channels == 1) {
 224                                 devc->acq_req = AQ_STATUS;
 225                                 lps_send_req(serial, "STATUS");
 226                         } else {
 227                                 devc->acq_req = AQ_U2;
 228                                 lps_send_req(serial, "VOUT2");
 229                         }
 230                         break;
 231                 case AQ_U2:
 232                         devc->acq_req = AQ_I2;
 233                         lps_send_req(serial, "IOUT2");
 234                         break;
 235                 case AQ_I2:
 236                         devc->acq_req = AQ_STATUS;
 237                         lps_send_req(serial, "STATUS");
 238                         break;
 239                 default:
 240                         sr_err("Illegal devc->acq_req=%d", devc->acq_req);
 241                         return SR_ERR;
 242                 }
 243                 devc->req_sent_at = g_get_real_time();
 244                 devc->acq_req_pending = 1;
 245         }
 246
 247         return TRUE;
 248 }