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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 <string.h> | |
21 | #include <stdarg.h> | |
22 | #include "protocol.h" | |
23 | ||
24 | SR_PRIV int scpi_cmd(const struct sr_dev_inst *sdi, int command, ...) | |
25 | { | |
26 | va_list args; | |
27 | struct dev_context *devc; | |
28 | struct sr_scpi_dev_inst *scpi; | |
29 | unsigned int i; | |
30 | int ret; | |
31 | char *cmd; | |
32 | ||
33 | devc = sdi->priv; | |
34 | cmd = NULL; | |
35 | for (i = 0; i < devc->device->num_commands; i++) { | |
36 | if (devc->device->commands[i].command == command) { | |
37 | cmd = devc->device->commands[i].string; | |
38 | break; | |
39 | } | |
40 | } | |
41 | if (!cmd) { | |
42 | /* Device does not implement this command, that's OK. */ | |
43 | return SR_OK_CONTINUE; | |
44 | } | |
45 | ||
46 | scpi = sdi->conn; | |
47 | va_start(args, command); | |
48 | ret = sr_scpi_send_variadic(scpi, cmd, args); | |
49 | va_end(args); | |
50 | ||
51 | return ret; | |
52 | } | |
53 | ||
54 | SR_PRIV int scpi_pps_receive_data(int fd, int revents, void *cb_data) | |
55 | { | |
56 | struct dev_context *devc; | |
57 | struct sr_datafeed_packet packet; | |
58 | struct sr_datafeed_analog analog; | |
59 | const struct sr_dev_inst *sdi; | |
60 | struct sr_scpi_dev_inst *scpi; | |
61 | GSList *l; | |
62 | float f; | |
63 | ||
64 | (void)fd; | |
65 | (void)revents; | |
66 | ||
67 | if (!(sdi = cb_data)) | |
68 | return TRUE; | |
69 | ||
70 | if (!(devc = sdi->priv)) | |
71 | return TRUE; | |
72 | ||
73 | if (devc->state == STATE_STOP) | |
74 | return TRUE; | |
75 | ||
76 | scpi = sdi->conn; | |
77 | ||
78 | /* Retrieve requested value for this state. */ | |
79 | if (sr_scpi_get_float(scpi, NULL, &f) == SR_OK) { | |
80 | packet.type = SR_DF_ANALOG; | |
81 | packet.payload = &analog; | |
82 | analog.channels = g_slist_append(NULL, devc->cur_channel); | |
83 | analog.num_samples = 1; | |
84 | if (devc->state == STATE_VOLTAGE) { | |
85 | analog.mq = SR_MQ_VOLTAGE; | |
86 | analog.unit = SR_UNIT_VOLT; | |
87 | } else { | |
88 | analog.mq = SR_MQ_CURRENT; | |
89 | analog.unit = SR_UNIT_AMPERE; | |
90 | } | |
91 | analog.mqflags = SR_MQFLAG_DC; | |
92 | analog.data = &f; | |
93 | sr_session_send(sdi, &packet); | |
94 | g_slist_free(analog.channels); | |
95 | } | |
96 | ||
97 | if (devc->state == STATE_VOLTAGE) { | |
98 | /* Just got voltage, request current for this channel. */ | |
99 | devc->state = STATE_CURRENT; | |
100 | scpi_cmd(sdi, SCPI_CMD_GET_MEAS_CURRENT, devc->cur_channel->name); | |
101 | } else if (devc->state == STATE_CURRENT) { | |
102 | /* | |
103 | * Done with voltage and current for this channel, switch to | |
104 | * the next enabled channel. | |
105 | */ | |
106 | do { | |
107 | l = g_slist_find(sdi->channels, devc->cur_channel); | |
108 | if (l->next) | |
109 | devc->cur_channel = l->next->data; | |
110 | else | |
111 | devc->cur_channel = sdi->channels->data; | |
112 | } while (!devc->cur_channel->enabled); | |
113 | ||
114 | /* Request voltage. */ | |
115 | devc->state = STATE_VOLTAGE; | |
116 | scpi_cmd(sdi, SCPI_CMD_GET_MEAS_VOLTAGE, devc->cur_channel->name); | |
117 | } | |
118 | ||
119 | return TRUE; | |
120 | } |