* This file is part of the libsigrok project.
*
* Copyright (C) 2014 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/** @file
+ * <em>Manson HCS-3xxx Series</em> power supply driver
+ * @internal
+ */
+
#include "protocol.h"
-SR_PRIV int manson_hcs_3xxx_receive_data(int fd, int revents, void *cb_data)
+#define REQ_TIMEOUT_MS 500
+
+SR_PRIV int hcs_send_cmd(struct sr_serial_dev_inst *serial, const char *cmd, ...)
+{
+ int ret;
+ char cmdbuf[50];
+ char *cmd_esc;
+ va_list args;
+
+ va_start(args, cmd);
+ vsnprintf(cmdbuf, sizeof(cmdbuf), cmd, args);
+ va_end(args);
+
+ cmd_esc = g_strescape(cmdbuf, NULL);
+ sr_dbg("Sending '%s'.", cmd_esc);
+ g_free(cmd_esc);
+
+ if ((ret = serial_write_blocking(serial, cmdbuf, strlen(cmdbuf))) < 0) {
+ sr_err("Error sending command: %d.", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+/**
+ * Read data from interface into buffer blocking until @a lines number of \\r chars
+ * received.
+ * @param serial Previously initialized serial port structure.
+ * @param[in] lines Number of \\r-terminated lines to read (1-n).
+ * @param buf Buffer for result. Contents is NUL-terminated on success.
+ * @param[in] buflen Buffer length (>0).
+ * @retval SR_OK Lines received and ending with "OK\r" (success).
+ * @retval SR_ERR Error.
+ * @retval SR_ERR_ARG Invalid argument.
+ */
+SR_PRIV int hcs_read_reply(struct sr_serial_dev_inst *serial, int lines, char* buf, int buflen)
+{
+ int l_recv = 0;
+ int bufpos = 0;
+ int retc;
+
+ if (!serial || (lines <= 0) || !buf || (buflen <= 0))
+ return SR_ERR_ARG;
+
+ while ((l_recv < lines) && (bufpos < (buflen + 1))) {
+ retc = serial_read_blocking(serial, &buf[bufpos], 1);
+ if (retc != 1)
+ return SR_ERR;
+ if (buf[bufpos] == '\r')
+ l_recv++;
+ bufpos++;
+ }
+ buf[bufpos] = '\0';
+
+ if ((l_recv == lines) && (g_str_has_suffix(buf, "OK\r")))
+ return SR_OK;
+ else
+ return SR_ERR;
+}
+
+/** Interpret result of GETD command. */
+SR_PRIV int hcs_parse_volt_curr_mode(struct sr_dev_inst *sdi, char **tokens)
+{
+ char *str;
+ double val;
+ struct dev_context *devc;
+
+ devc = sdi->priv;
+
+ /* Bytes 0-3: Voltage. */
+ str = g_strndup(tokens[0], 4);
+ val = g_ascii_strtod(str, NULL) / 100;
+ devc->voltage = val;
+ g_free(str);
+
+ /* Bytes 4-7: Current. */
+ str = g_strndup((tokens[0] + 4), 4);
+ val = g_ascii_strtod(str, NULL) / 100;
+ devc->current = val;
+ g_free(str);
+
+ /* Byte 8: Mode ('0' means CV, '1' means CC). */
+ devc->cc_mode = (tokens[0][8] == '1');
+
+ /* Output enabled? Works because voltage cannot be set to 0.0 directly. */
+ devc->output_enabled = devc->voltage != 0.0;
+
+ return SR_OK;
+}
+
+static void send_sample(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+
+ devc = sdi->priv;
+
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ analog.channels = sdi->channels;
+ analog.num_samples = 1;
+
+ analog.mq = SR_MQ_VOLTAGE;
+ analog.unit = SR_UNIT_VOLT;
+ analog.mqflags = SR_MQFLAG_DC;
+ analog.data = &devc->voltage;
+ sr_session_send(sdi, &packet);
+
+ analog.mq = SR_MQ_CURRENT;
+ analog.unit = SR_UNIT_AMPERE;
+ analog.mqflags = 0;
+ analog.data = &devc->current;
+ sr_session_send(sdi, &packet);
+
+ devc->num_samples++;
+}
+
+static int parse_reply(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ char *reply_esc, **tokens;
+ int retc;
+
+ devc = sdi->priv;
+
+ reply_esc = g_strescape(devc->buf, NULL);
+ sr_dbg("Received '%s'.", reply_esc);
+ g_free(reply_esc);
+
+ tokens = g_strsplit(devc->buf, "\r", 0);
+ retc = hcs_parse_volt_curr_mode(sdi, tokens);
+ g_strfreev(tokens);
+ if (retc < 0)
+ return SR_ERR;
+
+ send_sample(sdi);
+
+ return SR_OK;
+}
+
+static int handle_new_data(struct sr_dev_inst *sdi)
+{
+ int len;
+ struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+
+ devc = sdi->priv;
+ serial = sdi->conn;
+
+ len = serial_read(serial, devc->buf + devc->buflen, 1);
+ if (len < 1)
+ return SR_ERR;
+
+ devc->buflen += len;
+ devc->buf[devc->buflen] = '\0';
+
+ /* Wait until we received an "OK\r" (among other bytes). */
+ if (!g_str_has_suffix(devc->buf, "OK\r"))
+ return SR_OK;
+
+ parse_reply(sdi);
+
+ devc->buf[0] = '\0';
+ devc->buflen = 0;
+
+ devc->reply_pending = FALSE;
+
+ return SR_OK;
+}
+
+/** Driver/serial data reception function. */
+SR_PRIV int hcs_receive_data(int fd, int revents, void *cb_data)
{
- const struct sr_dev_inst *sdi;
+ struct sr_dev_inst *sdi;
struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ int64_t t, elapsed_us;
(void)fd;
if (!(devc = sdi->priv))
return TRUE;
+ serial = sdi->conn;
+
if (revents == G_IO_IN) {
+ /* New data arrived. */
+ handle_new_data(sdi);
+ } else {
+ /* Timeout. */
+ }
+
+ if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
+ sr_info("Requested number of samples reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ return TRUE;
+ }
+
+ if (devc->limit_msec) {
+ t = (g_get_monotonic_time() - devc->starttime) / 1000;
+ if (t > (int64_t)devc->limit_msec) {
+ sr_info("Requested time limit reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ return TRUE;
+ }
+ }
+
+ /* Request next packet, if required. */
+ if (sdi->status == SR_ST_ACTIVE) {
+ if (devc->reply_pending) {
+ elapsed_us = g_get_monotonic_time() - devc->req_sent_at;
+ if (elapsed_us > (REQ_TIMEOUT_MS * 1000))
+ devc->reply_pending = FALSE;
+ return TRUE;
+ }
+
+ /* Send command to get voltage, current, and mode (CC or CV). */
+ if (hcs_send_cmd(serial, "GETD\r") < 0)
+ return TRUE;
+
+ devc->req_sent_at = g_get_monotonic_time();
+ devc->reply_pending = TRUE;
}
return TRUE;
projects / libsigrok.git / blobdiff