mavlink: major rewrite, prepare for dynamic mavlink streams configuration, WIP

src/modules/mavlink/mavlink_stream.cpp

@@ -0,0 +1,48 @@
+/*
+ * mavlink_stream.cpp
+ *
+ *  Created on: 24.02.2014
+ *      Author: ton
+ */
+
+#include <stdlib.h>
+
+#include "mavlink_orb_listener.h"
+
+MavlinkStream::MavlinkStream(MavlinkOrbListener *listener, void (*callback)(const MavlinkStream *), const unsigned int subs_n, const struct orb_metadata **metas, const size_t *sizes, const uintptr_t arg, const unsigned int interval)
+{
+	this->callback = callback;
+	this->arg = arg;
+	this->interval = interval * 1000;
+	this->mavlink = mavlink;
+	this->listener = listener;
+	this->subscriptions_n = subs_n;
+	this->subscriptions = (MavlinkOrbSubscription **) malloc(subs_n * sizeof(MavlinkOrbSubscription *));
+
+	for (int i = 0; i < subs_n; i++) {
+		this->subscriptions[i] = listener->add_subscription(metas[i], sizes[i], this, interval);
+	}
+}
+
+MavlinkStream::~MavlinkStream()
+{
+	free(subscriptions);
+}
+
+/**
+ * Update mavlink stream, i.e. update subscriptions and send message if necessary
+ */
+int MavlinkStream::update(const hrt_abstime t)
+{
+	uint64_t dt = t - last_sent;
+	if (dt > 0 && dt >= interval) {
+		/* interval expired, update all subscriptions */
+		for (unsigned int i = 0; i < subscriptions_n; i++) {
+			subscriptions[i]->update(t);
+		}
+
+		/* format and send mavlink message */
+		callback(this);
+		last_sent = t;
+	}
+}