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 select_channel(const struct sr_dev_inst *sdi, struct sr_channel *ch)
 104 {
 105         struct dev_context *devc;
 106         struct pps_channel *cur_pch, *new_pch;
 107         int ret;
 108
 109         if (g_slist_length(sdi->channels) == 1)
 110                 return SR_OK;
 111
 112         devc = sdi->priv;
 113         if (ch == devc->cur_channel)
 114                 return SR_OK;
 115
 116         new_pch = ch->priv;
 117         if (devc->cur_channel) {
 118                 cur_pch = devc->cur_channel->priv;
 119                 if (cur_pch->hw_output_idx == new_pch->hw_output_idx) {
 120                         /* Same underlying output channel. */
 121                         devc->cur_channel = ch;
 122                         return SR_OK;
 123                 }
 124         }
 125
 126         if ((ret = scpi_cmd(sdi, SCPI_CMD_SELECT_CHANNEL, new_pch->hwname)) == SR_OK)
 127                 devc->cur_channel = ch;
 128
 129         return ret;
 130 }
 131
 132 SR_PRIV struct sr_channel *next_enabled_channel(const struct sr_dev_inst *sdi,
 133                 struct sr_channel *cur_channel)
 134 {
 135         struct sr_channel *next_channel;
 136         GSList *l;
 137
 138         next_channel = cur_channel;
 139         do {
 140                 l = g_slist_find(sdi->channels, next_channel);
 141                 if (l && l->next)
 142                         next_channel = l->next->data;
 143                 else
 144                         next_channel = sdi->channels->data;
 145         } while (!next_channel->enabled);
 146
 147         return next_channel;
 148 }
 149
 150 SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
 151 {
 152         struct dev_context *devc;
 153         struct sr_datafeed_packet packet;
 154         struct sr_datafeed_analog analog;
 155         const struct sr_dev_inst *sdi;
 156         struct sr_channel *next_channel;
 157         struct sr_scpi_dev_inst *scpi;
 158         struct pps_channel *pch;
 159         float f;
 160         int cmd;
 161
 162         (void)fd;
 163         (void)revents;
 164
 165         if (!(sdi = cb_data))
 166                 return TRUE;
 167
 168         if (!(devc = sdi->priv))
 169                 return TRUE;
 170
 171         scpi = sdi->conn;
 172
 173         /* Retrieve requested value for this state. */
 174         if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) {
 175                 pch = devc->cur_channel->priv;
 176                 packet.type = SR_DF_ANALOG;
 177                 packet.payload = &analog;
 178                 analog.channels = g_slist_append(NULL, devc->cur_channel);
 179                 analog.num_samples = 1;
 180                 analog.mq = pch->mq;
 181                 if (pch->mq == SR_MQ_VOLTAGE)
 182                         analog.unit = SR_UNIT_VOLT;
 183                 else if (pch->mq == SR_MQ_CURRENT)
 184                         analog.unit = SR_UNIT_AMPERE;
 185                 else if (pch->mq == SR_MQ_POWER)
 186                         analog.unit = SR_UNIT_WATT;
 187                 analog.mqflags = SR_MQFLAG_DC;
 188                 analog.data = &f;
 189                 sr_session_send(sdi, &packet);
 190                 g_slist_free(analog.channels);
 191         }
 192
 193         if (g_slist_length(sdi->channels) > 1) {
 194                 next_channel = next_enabled_channel(sdi, devc->cur_channel);
 195                 if (select_channel(sdi, next_channel) != SR_OK) {
 196                         sr_err("Failed to select channel %s", next_channel->name);
 197                         return FALSE;
 198                 }
 199         }
 200
 201         pch = devc->cur_channel->priv;
 202         if (pch->mq == SR_MQ_VOLTAGE)
 203                 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
 204         else if (pch->mq == SR_MQ_CURRENT)
 205                 cmd = SCPI_CMD_GET_MEAS_CURRENT;
 206         else if (pch->mq == SR_MQ_POWER)
 207                 cmd = SCPI_CMD_GET_MEAS_POWER;
 208         else
 209                 return SR_ERR;
 210         scpi_cmd(sdi, cmd);
 211
 212         return TRUE;
 213 }