--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2014 Janne Huttunen <jahuttun@gmail.com>
+ * Copyright (C) 2019 Gerhard Sittig <gerhard.sittig@gmx.net>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libsigrok/libsigrok.h>
+#include <libsigrok-internal.h>
+#include "protocol.h"
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void send_frame_start(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct lcr_parse_info *info;
+ uint64_t freq;
+ const char *model;
+ struct sr_datafeed_packet packet;
+
+ devc = sdi->priv;
+ info = &devc->parse_info;
+
+ /* Communicate changes of frequency or model before data values. */
+ freq = info->output_freq;
+ if (freq != devc->output_freq) {
+ devc->output_freq = freq;
+ sr_session_send_meta(sdi, SR_CONF_OUTPUT_FREQUENCY,
+ g_variant_new_double(freq));
+ }
+ model = info->circuit_model;
+ if (model && model != devc->circuit_model) {
+ devc->circuit_model = model;
+ sr_session_send_meta(sdi, SR_CONF_EQUIV_CIRCUIT_MODEL,
+ g_variant_new_string(model));
+ }
+
+ /* Data is about to get sent. Start a new frame. */
+ packet.type = SR_DF_FRAME_BEGIN;
+ sr_session_send(sdi, &packet);
+}
+
+static int handle_packet(struct sr_dev_inst *sdi, const uint8_t *pkt)
+{
+ struct dev_context *devc;
+ struct lcr_parse_info *info;
+ const struct lcr_info *lcr;
+ size_t ch_idx;
+ int rc;
+ float value;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+ gboolean frame;
+ struct sr_channel *channel;
+
+ devc = sdi->priv;
+ info = &devc->parse_info;
+ lcr = devc->lcr_info;
+
+ /* Note: digits/spec_digits will be overridden later. */
+ sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
+ analog.num_samples = 1;
+ analog.data = &value;
+
+ frame = FALSE;
+ for (ch_idx = 0; ch_idx < lcr->channel_count; ch_idx++) {
+ channel = g_slist_nth_data(sdi->channels, ch_idx);
+ analog.meaning->channels = g_slist_append(NULL, channel);
+ info->ch_idx = ch_idx;
+ rc = lcr->packet_parse(pkt, &value, &analog, info);
+ if (sdi->session && rc == SR_OK && analog.meaning->mq && channel->enabled) {
+ if (!frame) {
+ send_frame_start(sdi);
+ frame = TRUE;
+ }
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(sdi, &packet);
+ }
+ g_slist_free(analog.meaning->channels);
+ }
+ if (frame) {
+ std_session_send_frame_end(sdi);
+ sr_sw_limits_update_frames_read(&devc->limits, 1);
+ }
+
+ return SR_OK;
+}
+
+static int handle_new_data(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ ssize_t rdsize;
+ const struct lcr_info *lcr;
+ uint8_t *pkt;
+ size_t copy_len;
+
+ devc = sdi->priv;
+ serial = sdi->conn;
+
+ /* Read another chunk of data into the buffer. */
+ rdsize = sizeof(devc->buf) - devc->buf_rxpos;
+ rdsize = serial_read_nonblocking(serial, &devc->buf[devc->buf_rxpos], rdsize);
+ if (rdsize < 0)
+ return SR_ERR_IO;
+ devc->buf_rxpos += rdsize;
+
+ /*
+ * Process as many packets as the buffer might contain. Assume
+ * that the stream is synchronized in the typical case. Re-sync
+ * in case of mismatch (skip individual bytes until data matches
+ * the expected packet layout again).
+ */
+ lcr = devc->lcr_info;
+ while (devc->buf_rxpos >= lcr->packet_size) {
+ pkt = &devc->buf[0];
+ if (!lcr->packet_valid(pkt)) {
+ copy_len = devc->buf_rxpos - 1;
+ memmove(&devc->buf[0], &devc->buf[1], copy_len);
+ devc->buf_rxpos--;
+ continue;
+ }
+ (void)handle_packet(sdi, pkt);
+ copy_len = devc->buf_rxpos - lcr->packet_size;
+ memmove(&devc->buf[0], &devc->buf[lcr->packet_size], copy_len);
+ devc->buf_rxpos -= lcr->packet_size;
+ }
+
+ return SR_OK;
+}
+
+static int handle_timeout(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ const struct lcr_info *lcr;
+ struct sr_serial_dev_inst *serial;
+ int64_t now;
+ int ret;
+
+ devc = sdi->priv;
+ lcr = devc->lcr_info;
+
+ if (!lcr->packet_request)
+ return SR_OK;
+
+ now = g_get_monotonic_time();
+ if (devc->req_next_at && now < devc->req_next_at)
+ return SR_OK;
+
+ serial = sdi->conn;
+ ret = lcr->packet_request(serial);
+ if (ret < 0) {
+ sr_err("Failed to request packet: %d.", ret);
+ return ret;
+ }
+
+ if (lcr->req_timeout_ms)
+ devc->req_next_at = now + lcr->req_timeout_ms * 1000;
+
+ return SR_OK;
+}
+
+SR_PRIV int lcr_receive_data(int fd, int revents, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
+ struct dev_context *devc;
+ int ret;
+
+ (void)fd;
+
+ if (!(sdi = cb_data))
+ return TRUE;
+ if (!(devc = sdi->priv))
+ return TRUE;
+
+ if (revents == G_IO_IN)
+ ret = handle_new_data(sdi);
+ else
+ ret = handle_timeout(sdi);
+ if (sr_sw_limits_check(&devc->limits))
+ sr_dev_acquisition_stop(sdi);
+ if (ret != SR_OK)
+ return FALSE;
+
+ return TRUE;
+}
projects / libsigrok.git / blobdiff