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, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 * <em>Manson HCS-3xxx Series</em> power supply driver
29 #define REQ_TIMEOUT_MS 500
31 SR_PRIV int hcs_send_cmd(struct sr_serial_dev_inst *serial, const char *cmd, ...)
39 vsnprintf(cmdbuf, sizeof(cmdbuf), cmd, args);
42 cmd_esc = g_strescape(cmdbuf, NULL);
43 sr_dbg("Sending '%s'.", cmd_esc);
46 if ((ret = serial_write_blocking(serial, cmdbuf, strlen(cmdbuf), 0)) < 0) {
47 sr_err("Error sending command: %d.", ret);
55 * Read data from interface into buffer blocking until @a lines number of \\r chars
57 * @param serial Previously initialized serial port structure.
58 * @param[in] lines Number of \\r-terminated lines to read (1-n).
59 * @param buf Buffer for result. Contents is NUL-terminated on success.
60 * @param[in] buflen Buffer length (>0).
61 * @retval SR_OK Lines received and ending with "OK\r" (success).
62 * @retval SR_ERR Error.
63 * @retval SR_ERR_ARG Invalid argument.
65 SR_PRIV int hcs_read_reply(struct sr_serial_dev_inst *serial, int lines, char* buf, int buflen)
71 if (!serial || (lines <= 0) || !buf || (buflen <= 0))
74 while ((l_recv < lines) && (bufpos < (buflen + 1))) {
75 retc = serial_read_blocking(serial, &buf[bufpos], 1, 0);
78 if (buf[bufpos] == '\r')
84 if ((l_recv == lines) && (g_str_has_suffix(buf, "OK\r")))
90 /** Interpret result of GETD command. */
91 SR_PRIV int hcs_parse_volt_curr_mode(struct sr_dev_inst *sdi, char **tokens)
95 struct dev_context *devc;
99 /* Bytes 0-3: Voltage. */
100 str = g_strndup(tokens[0], 4);
101 val = g_ascii_strtod(str, NULL) / 100;
105 /* Bytes 4-7: Current. */
106 str = g_strndup((tokens[0] + 4), 4);
107 val = g_ascii_strtod(str, NULL) / 100;
111 /* Byte 8: Mode ('0' means CV, '1' means CC). */
112 devc->cc_mode = (tokens[0][8] == '1');
114 /* Output enabled? Works because voltage cannot be set to 0.0 directly. */
115 devc->output_enabled = devc->voltage != 0.0;
120 static void send_sample(struct sr_dev_inst *sdi)
122 struct dev_context *devc;
123 struct sr_datafeed_packet packet;
124 struct sr_datafeed_analog analog;
128 packet.type = SR_DF_ANALOG;
129 packet.payload = &analog;
130 analog.channels = sdi->channels;
131 analog.num_samples = 1;
133 analog.mq = SR_MQ_VOLTAGE;
134 analog.unit = SR_UNIT_VOLT;
135 analog.mqflags = SR_MQFLAG_DC;
136 analog.data = &devc->voltage;
137 sr_session_send(sdi, &packet);
139 analog.mq = SR_MQ_CURRENT;
140 analog.unit = SR_UNIT_AMPERE;
142 analog.data = &devc->current;
143 sr_session_send(sdi, &packet);
148 static int parse_reply(struct sr_dev_inst *sdi)
150 struct dev_context *devc;
151 char *reply_esc, **tokens;
156 reply_esc = g_strescape(devc->buf, NULL);
157 sr_dbg("Received '%s'.", reply_esc);
160 tokens = g_strsplit(devc->buf, "\r", 0);
161 retc = hcs_parse_volt_curr_mode(sdi, tokens);
171 static int handle_new_data(struct sr_dev_inst *sdi)
174 struct dev_context *devc;
175 struct sr_serial_dev_inst *serial;
180 len = serial_read_blocking(serial, devc->buf + devc->buflen, 1, 0);
185 devc->buf[devc->buflen] = '\0';
187 /* Wait until we received an "OK\r" (among other bytes). */
188 if (!g_str_has_suffix(devc->buf, "OK\r"))
196 devc->reply_pending = FALSE;
201 /** Driver/serial data reception function. */
202 SR_PRIV int hcs_receive_data(int fd, int revents, void *cb_data)
204 struct sr_dev_inst *sdi;
205 struct dev_context *devc;
206 struct sr_serial_dev_inst *serial;
207 int64_t t, elapsed_us;
211 if (!(sdi = cb_data))
214 if (!(devc = sdi->priv))
219 if (revents == G_IO_IN) {
220 /* New data arrived. */
221 handle_new_data(sdi);
226 if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
227 sr_info("Requested number of samples reached.");
228 sdi->driver->dev_acquisition_stop(sdi, cb_data);
232 if (devc->limit_msec) {
233 t = (g_get_monotonic_time() - devc->starttime) / 1000;
234 if (t > (int64_t)devc->limit_msec) {
235 sr_info("Requested time limit reached.");
236 sdi->driver->dev_acquisition_stop(sdi, cb_data);
241 /* Request next packet, if required. */
242 if (sdi->status == SR_ST_ACTIVE) {
243 if (devc->reply_pending) {
244 elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
245 if (elapsed_us > (REQ_TIMEOUT_MS * 1000))
246 devc->reply_pending = FALSE;
250 /* Send command to get voltage, current, and mode (CC or CV). */
251 if (hcs_send_cmd(serial, "GETD\r") < 0)
254 devc->req_sent_at = g_get_monotonic_time();
255 devc->reply_pending = TRUE;