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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 select_channel(const struct sr_dev_inst *sdi, struct sr_channel *ch) | |
28 | { | |
29 | struct dev_context *devc; | |
30 | struct pps_channel *cur_pch, *new_pch; | |
31 | int ret; | |
32 | ||
33 | if (g_slist_length(sdi->channels) == 1) | |
34 | return SR_OK; | |
35 | ||
36 | devc = sdi->priv; | |
37 | if (ch == devc->cur_channel) | |
38 | return SR_OK; | |
39 | ||
40 | new_pch = ch->priv; | |
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; | |
46 | return SR_OK; | |
47 | } | |
48 | } | |
49 | ||
50 | if ((ret = scpi_cmd(sdi, devc->device->commands, SCPI_CMD_SELECT_CHANNEL, | |
51 | new_pch->hwname)) >= 0) | |
52 | devc->cur_channel = ch; | |
53 | ||
54 | return ret; | |
55 | } | |
56 | ||
57 | SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data) | |
58 | { | |
59 | struct dev_context *devc; | |
60 | struct sr_datafeed_packet packet; | |
61 | struct sr_datafeed_analog_old analog; | |
62 | const struct sr_dev_inst *sdi; | |
63 | struct sr_channel *next_channel; | |
64 | struct sr_scpi_dev_inst *scpi; | |
65 | struct pps_channel *pch; | |
66 | float f; | |
67 | int cmd; | |
68 | ||
69 | (void)fd; | |
70 | (void)revents; | |
71 | ||
72 | if (!(sdi = cb_data)) | |
73 | return TRUE; | |
74 | ||
75 | if (!(devc = sdi->priv)) | |
76 | return TRUE; | |
77 | ||
78 | scpi = sdi->conn; | |
79 | ||
80 | /* Retrieve requested value for this state. */ | |
81 | if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) { | |
82 | pch = devc->cur_channel->priv; | |
83 | packet.type = SR_DF_ANALOG_OLD; | |
84 | packet.payload = &analog; | |
85 | analog.channels = g_slist_append(NULL, devc->cur_channel); | |
86 | analog.num_samples = 1; | |
87 | analog.mq = pch->mq; | |
88 | if (pch->mq == SR_MQ_VOLTAGE) | |
89 | analog.unit = SR_UNIT_VOLT; | |
90 | else if (pch->mq == SR_MQ_CURRENT) | |
91 | analog.unit = SR_UNIT_AMPERE; | |
92 | else if (pch->mq == SR_MQ_POWER) | |
93 | analog.unit = SR_UNIT_WATT; | |
94 | analog.mqflags = SR_MQFLAG_DC; | |
95 | analog.data = &f; | |
96 | sr_session_send(sdi, &packet); | |
97 | g_slist_free(analog.channels); | |
98 | } | |
99 | ||
100 | if (g_slist_length(sdi->channels) > 1) { | |
101 | next_channel = sr_next_enabled_channel(sdi, devc->cur_channel); | |
102 | if (select_channel(sdi, next_channel) != SR_OK) { | |
103 | sr_err("Failed to select channel %s", next_channel->name); | |
104 | return FALSE; | |
105 | } | |
106 | } | |
107 | ||
108 | pch = devc->cur_channel->priv; | |
109 | if (pch->mq == SR_MQ_VOLTAGE) | |
110 | cmd = SCPI_CMD_GET_MEAS_VOLTAGE; | |
111 | else if (pch->mq == SR_MQ_FREQUENCY) | |
112 | cmd = SCPI_CMD_GET_MEAS_FREQUENCY; | |
113 | else if (pch->mq == SR_MQ_CURRENT) | |
114 | cmd = SCPI_CMD_GET_MEAS_CURRENT; | |
115 | else if (pch->mq == SR_MQ_POWER) | |
116 | cmd = SCPI_CMD_GET_MEAS_POWER; | |
117 | else | |
118 | return SR_ERR; | |
119 | scpi_cmd(sdi, devc->device->commands, cmd); | |
120 | ||
121 | return TRUE; | |
122 | } |