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 <string.h>
  21 #include <stdarg.h>
  22 #include "protocol.h"
  23
  24 SR_PRIV char *scpi_cmd_get(const struct sr_dev_inst *sdi, int command)
  25 {
  26         struct dev_context *devc;
  27         unsigned int i;
  28         char *cmd;
  29
  30         devc = sdi->priv;
  31         cmd = NULL;
  32         for (i = 0; i < devc->device->num_commands; i++) {
  33                 if (devc->device->commands[i].command == command) {
  34                         cmd = devc->device->commands[i].string;
  35                         break;
  36                 }
  37         }
  38
  39         return cmd;
  40 }
  41
  42 SR_PRIV int scpi_cmd(const struct sr_dev_inst *sdi, int command, ...)
  43 {
  44         struct sr_scpi_dev_inst *scpi;
  45         va_list args;
  46         int ret;
  47         char *cmd;
  48
  49         if (!(cmd = scpi_cmd_get(sdi, command))) {
  50                 /* Device does not implement this command, that's OK. */
  51                 return SR_OK_CONTINUE;
  52         }
  53
  54         scpi = sdi->conn;
  55         va_start(args, command);
  56         ret = sr_scpi_send_variadic(scpi, cmd, args);
  57         va_end(args);
  58
  59         return ret;
  60 }
  61
  62 SR_PRIV int scpi_cmd_resp(const struct sr_dev_inst *sdi, GVariant **gvar,
  63                 const GVariantType *gvtype, int command, ...)
  64 {
  65         struct sr_scpi_dev_inst *scpi;
  66         va_list args;
  67         double d;
  68         int ret;
  69         char *cmd, *s;
  70
  71         if (!(cmd = scpi_cmd_get(sdi, command))) {
  72                 /* Device does not implement this command, that's OK. */
  73                 return SR_OK_CONTINUE;
  74         }
  75
  76         scpi = sdi->conn;
  77         va_start(args, command);
  78         ret = sr_scpi_send_variadic(scpi, cmd, args);
  79         va_end(args);
  80         if (ret != SR_OK)
  81                 return ret;
  82
  83         if (g_variant_type_equal(gvtype, G_VARIANT_TYPE_BOOLEAN)) {
  84                 if ((ret = sr_scpi_get_string(scpi, NULL, &s)) != SR_OK)
  85                         return ret;
  86                 if (!strcasecmp(s, "ON") || !strcasecmp(s, "1") || !strcasecmp(s, "YES"))
  87                         *gvar = g_variant_new_boolean(TRUE);
  88                 else if (!strcasecmp(s, "OFF") || !strcasecmp(s, "0") || !strcasecmp(s, "NO"))
  89                         *gvar = g_variant_new_boolean(FALSE);
  90                 else
  91                         ret = SR_ERR;
  92         } if (g_variant_type_equal(gvtype, G_VARIANT_TYPE_DOUBLE)) {
  93                 if ((ret = sr_scpi_get_double(scpi, NULL, &d)) == SR_OK)
  94                         *gvar = g_variant_new_double(d);
  95         } if (g_variant_type_equal(gvtype, G_VARIANT_TYPE_STRING)) {
  96                 if ((ret = sr_scpi_get_string(scpi, NULL, &s)) == SR_OK)
  97                         *gvar = g_variant_new_string(s);
  98         }
  99
 100         return ret;
 101 }
 102
 103 SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
 104 {
 105         struct dev_context *devc;
 106         struct sr_datafeed_packet packet;
 107         struct sr_datafeed_analog analog;
 108         const struct sr_dev_inst *sdi;
 109         struct sr_scpi_dev_inst *scpi;
 110         GSList *l;
 111         float f;
 112
 113         (void)fd;
 114         (void)revents;
 115
 116         if (!(sdi = cb_data))
 117                 return TRUE;
 118
 119         if (!(devc = sdi->priv))
 120                 return TRUE;
 121
 122         if (devc->state == STATE_STOP)
 123                 return TRUE;
 124
 125         scpi = sdi->conn;
 126
 127         /* Retrieve requested value for this state. */
 128         if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) {
 129                 packet.type = SR_DF_ANALOG;
 130                 packet.payload = &analog;
 131                 analog.channels = g_slist_append(NULL, devc->cur_channel);
 132                 analog.num_samples = 1;
 133                 if (devc->state == STATE_VOLTAGE) {
 134                         analog.mq = SR_MQ_VOLTAGE;
 135                         analog.unit = SR_UNIT_VOLT;
 136                 } else {
 137                         analog.mq = SR_MQ_CURRENT;
 138                         analog.unit = SR_UNIT_AMPERE;
 139                 }
 140                 analog.mqflags = SR_MQFLAG_DC;
 141                 analog.data = &f;
 142                 sr_session_send(sdi, &packet);
 143                 g_slist_free(analog.channels);
 144         }
 145
 146         if (devc->state == STATE_VOLTAGE) {
 147                 /* Just got voltage, request current for this channel. */
 148                 devc->state = STATE_CURRENT;
 149                 scpi_cmd(sdi, SCPI_CMD_GET_MEAS_CURRENT, devc->cur_channel->name);
 150         } else if (devc->state == STATE_CURRENT) {
 151                 /*
 152                  * Done with voltage and current for this channel, switch to
 153                  * the next enabled channel.
 154                  */
 155                 do {
 156                         l = g_slist_find(sdi->channels, devc->cur_channel);
 157                         if (l->next)
 158                                 devc->cur_channel = l->next->data;
 159                         else
 160                                 devc->cur_channel = sdi->channels->data;
 161                 } while (!devc->cur_channel->enabled);
 162
 163                 /* Request voltage. */
 164                 devc->state = STATE_VOLTAGE;
 165                 scpi_cmd(sdi, SCPI_CMD_GET_MEAS_VOLTAGE, devc->cur_channel->name);
 166         }
 167
 168         return TRUE;
 169 }