+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2014 Uwe Hermann <uwe@hermann-uwe.de>
- *
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "protocol.h"
-
-#define REQ_TIMEOUT_MS 500
-
-static int send_cmd(struct sr_serial_dev_inst *serial, const char *cmd)
-{
- int ret;
- char *cmd_esc;
-
- cmd_esc = g_strescape(cmd, NULL);
- sr_dbg("Sending '%s'.", cmd_esc);
-
- if ((ret = serial_write_blocking(serial, cmd, strlen(cmd))) < 0) {
- sr_err("Error sending command: %d.", ret);
- g_free(cmd_esc);
- return ret;
- }
-
- g_free(cmd_esc);
-
- return ret;
-}
-
-static int 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');
-
- 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;
-
- devc = sdi->priv;
-
- reply_esc = g_strescape(devc->buf, NULL);
- sr_dbg("Received '%s'.", reply_esc);
-
- tokens = g_strsplit(devc->buf, "\r", 0);
-
- if (parse_volt_curr_mode(sdi, tokens) < 0)
- return SR_ERR;
- send_sample(sdi);
-
- g_free(reply_esc);
- g_strfreev(tokens);
-
- 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;
-}
-
-SR_PRIV int hcs_receive_data(int fd, int revents, void *cb_data)
-{
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
- struct sr_serial_dev_inst *serial;
- int64_t t, elapsed_us;
-
- (void)fd;
-
- if (!(sdi = cb_data))
- return TRUE;
-
- 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 (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