--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2013 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"
+
+static int mic_send(struct sr_serial_dev_inst *serial, const char *cmd)
+{
+ int ret;
+
+ if ((ret = serial_write(serial, cmd, strlen(cmd))) < 0) {
+ sr_err("Error sending '%s' command: %d.", cmd, ret);
+ return SR_ERR;
+ }
+
+ return SR_OK;
+}
+
+SR_PRIV int mic_cmd_get_device_info(struct sr_serial_dev_inst *serial)
+{
+ return mic_send(serial, "I\r");
+}
+
+static int mic_cmd_set_realtime_mode(struct sr_serial_dev_inst *serial)
+{
+ return mic_send(serial, "S 1 M 2 32 3\r");
+}
+
+SR_PRIV gboolean packet_valid_temp(const uint8_t *buf)
+{
+ if (buf[0] != 'v' || buf[1] != ' ' || buf[5] != '\r')
+ return FALSE;
+
+ if (!isdigit(buf[2]) || !isdigit(buf[3]) || !isdigit(buf[4]))
+ return FALSE;
+
+ return TRUE;
+}
+
+SR_PRIV gboolean packet_valid_temp_hum(const uint8_t *buf)
+{
+ if (buf[0] != 'v' || buf[1] != ' ' || buf[5] != ' ' || buf[9] != '\r')
+ return FALSE;
+
+ if (!isdigit(buf[2]) || !isdigit(buf[3]) || !isdigit(buf[4]))
+ return FALSE;
+
+ if (!isdigit(buf[6]) || !isdigit(buf[7]) || !isdigit(buf[8]))
+ return FALSE;
+
+ return TRUE;
+}
+
+static int packet_parse(const char *buf, int idx, float *temp, float *humidity)
+{
+ char tmp[4];
+
+ /* Packet format MIC98581: "v ttt\r". */
+ /* Packet format MIC98583: "v ttt hhh\r". */
+
+ /* TODO: Sanity check on buf. For now we assume well-formed ASCII. */
+
+ tmp[3] = '\0';
+
+ strncpy((char *)&tmp, &buf[2], 3);
+ *temp = g_ascii_strtoull((const char *)&tmp, NULL, 10) / 10;
+
+ if (mic_devs[idx].has_humidity) {
+ strncpy((char *)&tmp, &buf[6], 3);
+ *humidity = g_ascii_strtoull((const char *)&tmp, NULL, 10) / 10;
+ }
+
+ return SR_OK;
+}
+
+static int handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi, int idx)
+{
+ float temperature, humidity;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct dev_context *devc;
+ GSList *l;
+ int ret;
+
+ (void)idx;
+
+ devc = sdi->priv;
+
+ ret = packet_parse((const char *)buf, idx, &temperature, &humidity);
+ if (ret < 0) {
+ sr_err("Failed to parse packet.");
+ return SR_ERR;
+ }
+
+ /* Clear 'analog', otherwise it'll contain random garbage. */
+ memset(&analog, 0, sizeof(struct sr_datafeed_analog));
+
+ /* Common values for both channels. */
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ analog.num_samples = 1;
+
+ /* Temperature. */
+ l = g_slist_copy(sdi->channels);
+ l = g_slist_remove_link(l, g_slist_nth(l, 1));
+ analog.channels = l;
+ analog.mq = SR_MQ_TEMPERATURE;
+ analog.unit = SR_UNIT_CELSIUS; /* TODO: Use C/F correctly. */
+ analog.data = &temperature;
+ sr_session_send(devc->cb_data, &packet);
+ g_slist_free(l);
+
+ /* Humidity. */
+ if (mic_devs[idx].has_humidity) {
+ l = g_slist_copy(sdi->channels);
+ l = g_slist_remove_link(l, g_slist_nth(l, 0));
+ analog.channels = l;
+ analog.mq = SR_MQ_RELATIVE_HUMIDITY;
+ analog.unit = SR_UNIT_PERCENTAGE;
+ analog.data = &humidity;
+ sr_session_send(devc->cb_data, &packet);
+ g_slist_free(l);
+ }
+
+ devc->num_samples++;
+
+ return SR_OK;
+}
+
+static void handle_new_data(struct sr_dev_inst *sdi, int idx)
+{
+ struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ int len, i, offset = 0;
+
+ devc = sdi->priv;
+ serial = sdi->conn;
+
+ /* Try to get as much data as the buffer can hold. */
+ len = SERIAL_BUFSIZE - devc->buflen;
+ len = serial_read(serial, devc->buf + devc->buflen, len);
+ if (len < 1) {
+ sr_err("Serial port read error: %d.", len);
+ return;
+ }
+
+ devc->buflen += len;
+
+ /* Now look for packets in that data. */
+ while ((devc->buflen - offset) >= mic_devs[idx].packet_size) {
+ if (mic_devs[idx].packet_valid(devc->buf + offset)) {
+ handle_packet(devc->buf + offset, sdi, idx);
+ offset += mic_devs[idx].packet_size;
+ } else {
+ offset++;
+ }
+ }
+
+ /* If we have any data left, move it to the beginning of our buffer. */
+ for (i = 0; i < devc->buflen - offset; i++)
+ devc->buf[i] = devc->buf[offset + i];
+ devc->buflen -= offset;
+}
+
+static int receive_data(int fd, int revents, int idx, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
+ struct dev_context *devc;
+ int64_t t;
+ static gboolean first_time = TRUE;
+ struct sr_serial_dev_inst *serial;
+
+ (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, idx);
+ } else {
+ /* Timeout. */
+ if (first_time) {
+ mic_cmd_set_realtime_mode(serial);
+ first_time = FALSE;
+ }
+ }
+
+ 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;
+ }
+ }
+
+ return TRUE;
+}
+
+#define RECEIVE_DATA(ID_UPPER) \
+SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \
+ return receive_data(fd, revents, ID_UPPER, cb_data); }
+
+/* Driver-specific receive_data() wrappers */
+RECEIVE_DATA(MIC_98581)
+RECEIVE_DATA(MIC_98583)
projects / libsigrok.git / blobdiff