px4_autopilot/apps/examples/control_demo/control_demo.cpp

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 *
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 *   Author: @author Example User <mail@example.com>
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/**
 * @file control_demo.cpp
 * Demonstration of control library
 */

#include <nuttx/config.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <systemlib/systemlib.h>
#include <controllib/fixedwing.hpp>
#include <systemlib/param/param.h>
#include <drivers/drv_hrt.h>
#include <math.h>

static bool thread_should_exit = false;     /**< Deamon exit flag */
static bool thread_running = false;     /**< Deamon status flag */
static int deamon_task;             /**< Handle of deamon task / thread */

/**
 * Deamon management function.
 */
extern "C" __EXPORT int control_demo_main(int argc, char *argv[]);

/**
 * Mainloop of deamon.
 */
int control_demo_thread_main(int argc, char *argv[]);

/**
 * Test function
 */
void test();

/**
 * Print the correct usage.
 */
static void usage(const char *reason);

static void
usage(const char *reason)
{
	if (reason)
		fprintf(stderr, "%s\n", reason);

	fprintf(stderr, "usage: control_demo {start|stop|status} [-p <additional params>]\n\n");
	exit(1);
}

/**
 * The deamon app only briefly exists to start
 * the background job. The stack size assigned in the
 * Makefile does only apply to this management task.
 *
 * The actual stack size should be set in the call
 * to task_create().
 */
int control_demo_main(int argc, char *argv[])
{

	if (argc < 1)
		usage("missing command");

	if (!strcmp(argv[1], "start")) {

		if (thread_running) {
			printf("control_demo already running\n");
			/* this is not an error */
			exit(0);
		}

		thread_should_exit = false;
		deamon_task = task_spawn("control_demo",
					 SCHED_DEFAULT,
					 SCHED_PRIORITY_MAX - 10,
					 5120,
					 control_demo_thread_main,
					 (argv) ? (const char **)&argv[2] : (const char **)NULL);
		exit(0);
	}

	if (!strcmp(argv[1], "test")) {
		test();
		exit(0);
	}

	if (!strcmp(argv[1], "stop")) {
		thread_should_exit = true;
		exit(0);
	}

	if (!strcmp(argv[1], "status")) {
		if (thread_running) {
			printf("\tcontrol_demo app is running\n");

		} else {
			printf("\tcontrol_demo app not started\n");
		}

		exit(0);
	}

	usage("unrecognized command");
	exit(1);
}

int control_demo_thread_main(int argc, char *argv[])
{

	printf("[control_Demo] starting\n");

	using namespace control;

	fixedwing::BlockMultiModeBacksideAutopilot autopilot(NULL, "FWB");

	thread_running = true;

	while (!thread_should_exit) {
		autopilot.update();
	}

	printf("[control_demo] exiting.\n");

	thread_running = false;

	return 0;
}

void test()
{
	printf("beginning control lib test\n");
	control::basicBlocksTest();
}