2 * This file is part of the libsigrok project.
4 * Copyright (C) 2014 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
27 SR_PRIV int select_channel(const struct sr_dev_inst *sdi, struct sr_channel *ch)
29 struct dev_context *devc;
30 struct pps_channel *cur_pch, *new_pch;
33 if (g_slist_length(sdi->channels) == 1)
37 if (ch == devc->cur_channel)
41 if (devc->cur_channel) {
42 cur_pch = devc->cur_channel->priv;
43 if (cur_pch->hw_output_idx == new_pch->hw_output_idx) {
44 /* Same underlying output channel. */
45 devc->cur_channel = ch;
50 if ((ret = scpi_cmd(sdi, devc->device->commands, SCPI_CMD_SELECT_CHANNEL,
51 new_pch->hwname)) >= 0)
52 devc->cur_channel = ch;
57 SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data)
59 struct dev_context *devc;
60 struct sr_datafeed_packet packet;
61 struct sr_datafeed_analog analog;
62 struct sr_analog_encoding encoding;
63 struct sr_analog_meaning meaning;
64 struct sr_analog_spec spec;
65 const struct sr_dev_inst *sdi;
66 struct sr_channel *next_channel;
67 struct sr_scpi_dev_inst *scpi;
68 struct pps_channel *pch;
78 if (!(devc = sdi->priv))
83 /* Retrieve requested value for this state. */
84 if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) {
85 pch = devc->cur_channel->priv;
86 packet.type = SR_DF_ANALOG;
87 packet.payload = &analog;
88 sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
89 analog.meaning->channels = g_slist_append(NULL, devc->cur_channel);
90 analog.num_samples = 1;
91 analog.meaning->mq = pch->mq;
92 if (pch->mq == SR_MQ_VOLTAGE)
93 analog.meaning->unit = SR_UNIT_VOLT;
94 else if (pch->mq == SR_MQ_CURRENT)
95 analog.meaning->unit = SR_UNIT_AMPERE;
96 else if (pch->mq == SR_MQ_POWER)
97 analog.meaning->unit = SR_UNIT_WATT;
98 analog.meaning->mqflags = SR_MQFLAG_DC;
100 sr_session_send(sdi, &packet);
101 g_slist_free(analog.meaning->channels);
104 if (g_slist_length(sdi->channels) > 1) {
105 next_channel = sr_next_enabled_channel(sdi, devc->cur_channel);
106 if (select_channel(sdi, next_channel) != SR_OK) {
107 sr_err("Failed to select channel %s", next_channel->name);
112 pch = devc->cur_channel->priv;
113 if (pch->mq == SR_MQ_VOLTAGE)
114 cmd = SCPI_CMD_GET_MEAS_VOLTAGE;
115 else if (pch->mq == SR_MQ_FREQUENCY)
116 cmd = SCPI_CMD_GET_MEAS_FREQUENCY;
117 else if (pch->mq == SR_MQ_CURRENT)
118 cmd = SCPI_CMD_GET_MEAS_CURRENT;
119 else if (pch->mq == SR_MQ_POWER)
120 cmd = SCPI_CMD_GET_MEAS_POWER;
123 scpi_cmd(sdi, devc->device->commands, cmd);