2 * This file is part of the libsigrok project.
4 * Copyright (C) 2014 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
24 #define REQ_TIMEOUT_MS 500
26 SR_PRIV int hcs_send_cmd(struct sr_serial_dev_inst *serial, const char *cmd, ...)
34 vsnprintf(cmdbuf, sizeof(cmdbuf), cmd, args);
37 cmd_esc = g_strescape(cmdbuf, NULL);
38 sr_dbg("Sending '%s'.", cmd_esc);
41 if ((ret = serial_write_blocking(serial, cmdbuf, strlen(cmdbuf),
42 serial_timeout(serial, strlen(cmdbuf)))) < 0) {
43 sr_err("Error sending command: %d.", ret);
51 * Read data from interface into buffer blocking until @a lines number of \\r chars
54 * @param serial Previously initialized serial port structure.
55 * @param[in] lines Number of \\r-terminated lines to read (1-n).
56 * @param buf Buffer for result. Contents is NUL-terminated on success.
57 * @param[in] buflen Buffer length (>0).
59 * @retval SR_OK Lines received and ending with "OK\r" (success).
60 * @retval SR_ERR Error.
61 * @retval SR_ERR_ARG Invalid argument.
63 SR_PRIV int hcs_read_reply(struct sr_serial_dev_inst *serial, int lines, char *buf, int buflen)
69 if (!serial || (lines <= 0) || !buf || (buflen <= 0))
72 while ((l_recv < lines) && (bufpos < (buflen + 1))) {
73 retc = serial_read_blocking(serial, &buf[bufpos], 1, 0);
76 if (buf[bufpos] == '\r')
82 if ((l_recv == lines) && (g_str_has_suffix(buf, "OK\r")))
88 /** Interpret result of GETD command. */
89 SR_PRIV int hcs_parse_volt_curr_mode(struct sr_dev_inst *sdi, char **tokens)
93 struct dev_context *devc;
97 /* Bytes 0-3: Voltage. */
98 str = g_strndup(tokens[0], 4);
99 val = g_ascii_strtod(str, NULL) / 100;
103 /* Bytes 4-7: Current. */
104 str = g_strndup((tokens[0] + 4), 4);
105 val = g_ascii_strtod(str, NULL) / 100;
109 /* Byte 8: Mode ('0' means CV, '1' means CC). */
110 devc->cc_mode = (tokens[0][8] == '1');
112 /* Output enabled? Works because voltage cannot be set to 0.0 directly. */
113 devc->output_enabled = devc->voltage != 0.0;
118 static void send_sample(struct sr_dev_inst *sdi)
120 struct dev_context *devc;
121 struct sr_datafeed_packet packet;
122 struct sr_datafeed_analog analog;
123 struct sr_analog_encoding encoding;
124 struct sr_analog_meaning meaning;
125 struct sr_analog_spec spec;
129 sr_analog_init(&analog, &encoding, &meaning, &spec, 2);
131 packet.type = SR_DF_ANALOG;
132 packet.payload = &analog;
133 analog.meaning->channels = sdi->channels;
134 analog.num_samples = 1;
136 analog.meaning->mq = SR_MQ_VOLTAGE;
137 analog.meaning->unit = SR_UNIT_VOLT;
138 analog.meaning->mqflags = SR_MQFLAG_DC;
139 analog.data = &devc->voltage;
140 sr_session_send(sdi, &packet);
142 analog.meaning->mq = SR_MQ_CURRENT;
143 analog.meaning->unit = SR_UNIT_AMPERE;
144 analog.meaning->mqflags = 0;
145 analog.data = &devc->current;
146 sr_session_send(sdi, &packet);
149 sr_sw_limits_update_samples_read(&devc->limits, 1);
152 static int parse_reply(struct sr_dev_inst *sdi)
154 struct dev_context *devc;
155 char *reply_esc, **tokens;
160 reply_esc = g_strescape(devc->buf, NULL);
161 sr_dbg("Received '%s'.", reply_esc);
164 tokens = g_strsplit(devc->buf, "\r", 0);
165 retc = hcs_parse_volt_curr_mode(sdi, tokens);
175 static int handle_new_data(struct sr_dev_inst *sdi)
178 struct dev_context *devc;
179 struct sr_serial_dev_inst *serial;
184 len = serial_read_blocking(serial, devc->buf + devc->buflen, 1, 0);
189 devc->buf[devc->buflen] = '\0';
191 /* Wait until we received an "OK\r" (among other bytes). */
192 if (!g_str_has_suffix(devc->buf, "OK\r"))
200 devc->reply_pending = FALSE;
205 /** Driver/serial data reception function. */
206 SR_PRIV int hcs_receive_data(int fd, int revents, void *cb_data)
208 struct sr_dev_inst *sdi;
209 struct dev_context *devc;
210 struct sr_serial_dev_inst *serial;
215 if (!(sdi = cb_data))
218 if (!(devc = sdi->priv))
223 if (revents == G_IO_IN) {
224 /* New data arrived. */
225 handle_new_data(sdi);
230 if (sr_sw_limits_check(&devc->limits)) {
231 sr_dev_acquisition_stop(sdi);
235 /* Request next packet, if required. */
236 if (sdi->status == SR_ST_ACTIVE) {
237 if (devc->reply_pending) {
238 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
239 if (elapsed_us > (REQ_TIMEOUT_MS * 1000))
240 devc->reply_pending = FALSE;
244 /* Send command to get voltage, current, and mode (CC or CV). */
245 if (hcs_send_cmd(serial, "GETD\r") < 0)
248 devc->req_sent_at = g_get_monotonic_time();
249 devc->reply_pending = TRUE;