src/hardware/scpi-pps/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <string.h>
  22 #include <strings.h>
  23 #include <stdarg.h>
  24 #include "scpi.h"
  25 #include "protocol.h"
  26
  27 SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
  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         struct sr_dev_inst *sdi;
  36         int channel_group_cmd;
  37         char *channel_group_name;
  38         struct pps_channel *pch;
  39         const struct channel_spec *ch_spec;
  40         int ret;
  41         float f;
  42         GVariant *gvdata;
  43         const GVariantType *gvtype;
  44         int cmd;
  45
  46         (void)fd;
  47         (void)revents;
  48
  49         if (!(sdi = cb_data))
  50                 return TRUE;
  51
  52         if (!(devc = sdi->priv))
  53                 return TRUE;
  54
  55         channel_group_cmd = 0;
  56         channel_group_name = NULL;
  57         if (g_slist_length(sdi->channel_groups) > 1) {
  58                 channel_group_cmd = SCPI_CMD_SELECT_CHANNEL;
  59                 channel_group_name = g_strdup(devc->cur_acquisition_channel->name);
  60         }
  61
  62         pch = devc->cur_acquisition_channel->priv;
  63         if (pch->mq == SR_MQ_VOLTAGE) {
  64                 gvtype = G_VARIANT_TYPE_DOUBLE;
  65                 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
  66         } else if (pch->mq == SR_MQ_FREQUENCY) {
  67                 gvtype = G_VARIANT_TYPE_DOUBLE;
  68                 cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
  69         } else if (pch->mq == SR_MQ_CURRENT) {
  70                 gvtype = G_VARIANT_TYPE_DOUBLE;
  71                 cmd = SCPI_CMD_GET_MEAS_CURRENT;
  72         } else if (pch->mq == SR_MQ_POWER) {
  73                 gvtype = G_VARIANT_TYPE_DOUBLE;
  74                 cmd = SCPI_CMD_GET_MEAS_POWER;
  75         } else {
  76                 return SR_ERR;
  77         }
  78
  79         ret = sr_scpi_cmd_resp(sdi, devc->device->commands,
  80                 channel_group_cmd, channel_group_name, &gvdata, gvtype, cmd);
  81         g_free(channel_group_name);
  82
  83         if (ret != SR_OK)
  84                 return ret;
  85
  86         ch_spec = &devc->device->channels[pch->hw_output_idx];
  87         packet.type = SR_DF_ANALOG;
  88         packet.payload = &analog;
  89         /* Note: digits/spec_digits will be overridden later. */
  90         sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
  91         analog.meaning->channels = g_slist_append(NULL, devc->cur_acquisition_channel);
  92         analog.num_samples = 1;
  93         analog.meaning->mq = pch->mq;
  94         if (pch->mq == SR_MQ_VOLTAGE) {
  95                 analog.meaning->unit = SR_UNIT_VOLT;
  96                 analog.encoding->digits = ch_spec->voltage[4];
  97                 analog.spec->spec_digits = ch_spec->voltage[3];
  98         } else if (pch->mq == SR_MQ_CURRENT) {
  99                 analog.meaning->unit = SR_UNIT_AMPERE;
 100                 analog.encoding->digits = ch_spec->current[4];
 101                 analog.spec->spec_digits = ch_spec->current[3];
 102         } else if (pch->mq == SR_MQ_POWER) {
 103                 analog.meaning->unit = SR_UNIT_WATT;
 104                 analog.encoding->digits = ch_spec->power[4];
 105                 analog.spec->spec_digits = ch_spec->power[3];
 106         }
 107         analog.meaning->mqflags = SR_MQFLAG_DC;
 108         f = (float)g_variant_get_double(gvdata);
 109         analog.data = &f;
 110         sr_session_send(sdi, &packet);
 111         g_slist_free(analog.meaning->channels);
 112
 113         /* Next channel. */
 114         if (g_slist_length(sdi->channels) > 1) {
 115                 devc->cur_acquisition_channel =
 116                         sr_next_enabled_channel(sdi, devc->cur_acquisition_channel);
 117         }
 118
 119         if (devc->cur_acquisition_channel == sr_next_enabled_channel(sdi, NULL))
 120                 /* First enabled channel, so each channel has been sampled */
 121                 sr_sw_limits_update_samples_read(&devc->limits, 1);
 122
 123         /* Stop if limits have been hit. */
 124         if (sr_sw_limits_check(&devc->limits))
 125                 sr_dev_acquisition_stop(sdi);
 126
 127         return TRUE;
 128 }