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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2018 Bastian Schmitz <bastian.schmitz@udo.edu> | |
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 "protocol.h" | |
23 | ||
24 | SR_PRIV int gpd_send_cmd(struct sr_serial_dev_inst *serial, const char *cmd, ...) | |
25 | { | |
26 | int ret; | |
27 | char cmdbuf[50]; | |
28 | char *cmd_esc; | |
29 | va_list args; | |
30 | ||
31 | va_start(args, cmd); | |
32 | vsnprintf(cmdbuf, sizeof(cmdbuf), cmd, args); | |
33 | va_end(args); | |
34 | ||
35 | cmd_esc = g_strescape(cmdbuf, NULL); | |
36 | sr_dbg("Sending '%s'.", cmd_esc); | |
37 | g_free(cmd_esc); | |
38 | ||
39 | ret = serial_write_blocking(serial, cmdbuf, strlen(cmdbuf), | |
40 | serial_timeout(serial, strlen(cmdbuf))); | |
41 | if (ret < 0) { | |
42 | sr_err("Error sending command: %d.", ret); | |
43 | return ret; | |
44 | } | |
45 | ||
46 | return ret; | |
47 | } | |
48 | ||
49 | SR_PRIV int gpd_receive_reply(struct sr_serial_dev_inst *serial, char *buf, | |
50 | int buflen) | |
51 | { | |
52 | int l_recv = 0, bufpos = 0, retc, l_startpos = 0, lines = 1; | |
53 | gint64 start, remaining; | |
54 | const int timeout_ms = 100; | |
55 | ||
56 | if (!serial || (lines <= 0) || !buf || (buflen <= 0)) | |
57 | return SR_ERR_ARG; | |
58 | ||
59 | start = g_get_monotonic_time(); | |
60 | remaining = timeout_ms; | |
61 | ||
62 | while ((l_recv < lines) && (bufpos < (buflen + 1))) { | |
63 | retc = serial_read_blocking(serial, &buf[bufpos], 1, remaining); | |
64 | if (retc != 1) | |
65 | return SR_ERR; | |
66 | ||
67 | if (bufpos == 0 && buf[bufpos] == '\r') | |
68 | continue; | |
69 | if (bufpos == 0 && buf[bufpos] == '\n') | |
70 | continue; | |
71 | ||
72 | if (buf[bufpos] == '\n') { | |
73 | buf[bufpos] = '\0'; | |
74 | sr_dbg("Received line '%s'.", &buf[l_startpos]); | |
75 | buf[bufpos] = '\n'; | |
76 | l_startpos = bufpos + 1; | |
77 | l_recv++; | |
78 | } | |
79 | bufpos++; | |
80 | ||
81 | /* Reduce timeout by time elapsed. */ | |
82 | remaining = timeout_ms - ((g_get_monotonic_time() - start) / 1000); | |
83 | if (remaining <= 0) | |
84 | return SR_ERR; /* Timeout. */ | |
85 | } | |
86 | ||
87 | buf[bufpos] = '\0'; | |
88 | ||
89 | if (l_recv == lines) | |
90 | return SR_OK; | |
91 | else | |
92 | return SR_ERR; | |
93 | } | |
94 | ||
95 | SR_PRIV int gpd_receive_data(int fd, int revents, void *cb_data) | |
96 | { | |
97 | struct sr_dev_inst *sdi; | |
98 | struct dev_context *devc; | |
99 | struct sr_serial_dev_inst *serial; | |
100 | struct sr_datafeed_packet packet; | |
101 | struct sr_datafeed_analog analog; | |
102 | struct sr_analog_encoding encoding; | |
103 | struct sr_analog_meaning meaning; | |
104 | struct sr_analog_spec spec; | |
105 | struct sr_channel *ch; | |
106 | unsigned int i; | |
107 | char reply[50]; | |
108 | char *reply_esc; | |
109 | ||
110 | (void)fd; | |
111 | ||
112 | if (!(sdi = cb_data)) | |
113 | return TRUE; | |
114 | ||
115 | if (!(devc = sdi->priv)) | |
116 | return TRUE; | |
117 | ||
118 | serial = sdi->conn; | |
119 | ||
120 | if (revents == G_IO_IN) { | |
121 | if (!devc->reply_pending) { | |
122 | sr_err("No reply pending."); | |
123 | gpd_receive_reply(serial, reply, sizeof(reply)); | |
124 | reply_esc = g_strescape(reply, NULL); | |
125 | sr_err("Unexpected data '%s'.", reply_esc); | |
126 | g_free(reply_esc); | |
127 | } else { | |
128 | for (i = 0; i < devc->model->num_channels; i++) { | |
129 | packet.type = SR_DF_ANALOG; | |
130 | packet.payload = &analog; | |
131 | ||
132 | reply[0] = '\0'; | |
133 | gpd_receive_reply(serial, reply, sizeof(reply)); | |
134 | if (sscanf(reply, "%f", &devc->config[i].output_voltage_max) != 1) { | |
135 | sr_err("Invalid reply to VOUT1?: '%s'.", | |
136 | reply); | |
137 | return TRUE; | |
138 | } | |
139 | ||
140 | /* Send the value forward. */ | |
141 | sr_analog_init(&analog, &encoding, &meaning, &spec, 0); | |
142 | analog.num_samples = 1; | |
143 | ch = g_slist_nth_data(sdi->channels, i); | |
144 | analog.meaning->channels = | |
145 | g_slist_append(NULL, ch); | |
146 | analog.meaning->mq = SR_MQ_CURRENT; | |
147 | analog.meaning->unit = SR_UNIT_AMPERE; | |
148 | analog.meaning->mqflags = 0; | |
149 | analog.encoding->digits = 3; | |
150 | analog.spec->spec_digits = 3; | |
151 | analog.data = &devc->config[i].output_current_max; | |
152 | sr_session_send(sdi, &packet); | |
153 | ||
154 | reply[0] = '\0'; | |
155 | gpd_receive_reply(serial, reply, sizeof(reply)); | |
156 | if (sscanf(reply, "%f", &devc->config[i].output_voltage_max) != 1) { | |
157 | sr_err("Invalid reply to VOUT1?: '%s'.", | |
158 | reply); | |
159 | return TRUE; | |
160 | } | |
161 | ||
162 | /* Send the value forward. */ | |
163 | sr_analog_init(&analog, &encoding, &meaning, &spec, 0); | |
164 | analog.num_samples = 1; | |
165 | ch = g_slist_nth_data(sdi->channels, i); | |
166 | analog.meaning->channels = | |
167 | g_slist_append(NULL, ch); | |
168 | analog.meaning->mq = SR_MQ_VOLTAGE; | |
169 | analog.meaning->unit = SR_UNIT_VOLT; | |
170 | analog.meaning->mqflags = SR_MQFLAG_DC; | |
171 | analog.encoding->digits = 3; | |
172 | analog.spec->spec_digits = 3; | |
173 | analog.data = &devc->config[i].output_voltage_max; | |
174 | sr_session_send(sdi, &packet); | |
175 | } | |
176 | ||
177 | devc->reply_pending = FALSE; | |
178 | } | |
179 | } else { | |
180 | if (!devc->reply_pending) { | |
181 | for (i = 0; i < devc->model->num_channels; i++) | |
182 | gpd_send_cmd(serial, "IOUT%d?\nVOUT%d?\n", | |
183 | i + 1, i + 1); | |
184 | devc->req_sent_at = g_get_monotonic_time(); | |
185 | devc->reply_pending = TRUE; | |
186 | } | |
187 | } | |
188 | ||
189 | if (sr_sw_limits_check(&devc->limits)) { | |
190 | sr_dev_acquisition_stop(sdi); | |
191 | return TRUE; | |
192 | } | |
193 | ||
194 | return TRUE; | |
195 | } |