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