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/**
 * @file SR05.hpp
 * @author David Sidrane <david.sidrane@nscdg.com>
 *
 * Interface for the HY-SRF05 / HC-SR05 and HC-SR04.
 * Precise Ultrasonic Range Sensor Module
 */
#pragma once

#include <px4_platform_common/px4_work_queue/ScheduledWorkItem.hpp>
#include <px4_platform_common/getopt.h>
#include <px4_platform_common/module.h>

#include <uORB/Subscription.hpp>
#include <board_config.h>
#include <drivers/device/device.h>
#include <lib/drivers/rangefinder/PX4Rangefinder.hpp>
#include <perf/perf_counter.h>

#if defined(GPIO_ULTRASOUND_TRIGGER) && defined(GPIO_ULTRASOUND_ECHO)
#  define HAVE_ULTRASOUND
#endif

using namespace time_literals;

// Device limits
static constexpr float HXSRX0X_MIN_DISTANCE{0.02f};
static constexpr float HXSRX0X_MAX_DISTANCE{4.5f};

// Normal conversion wait time.
static constexpr uint32_t HXSRX0X_CONVERSION_INTERVAL{50_ms};

// Maximum time to wait for a conversion to complete.
static constexpr uint32_t HXSRX0X_CONVERSION_TIMEOUT{30_ms};

class SRF05 : public ModuleBase<SRF05>, public px4::ScheduledWorkItem
{
public:
	SRF05(const uint8_t rotation = distance_sensor_s::ROTATION_DOWNWARD_FACING);
	virtual ~SRF05() override;

	/** @see ModuleBase */
	static int task_spawn(int argc, char *argv[]);

	/** @see ModuleBase */
	static int custom_command(int argc, char *argv[]);

	/** @see ModuleBase */
	static int print_usage(const char *reason = nullptr);

	int init();

	int print_status() override;

protected:
	void stop();
	int collect();
	int measure();

	void Run() override;

private:
	uint32_t get_measure_interval() const { return HXSRX0X_CONVERSION_INTERVAL; };

	static int EchoInterruptCallback(int irq, void *context, void *arg);
	void OnEdge(bool state);

	hrt_abstime _rising_edge_time{0};
	hrt_abstime _falling_edge_time{0};

	enum class STATE : uint8_t {
		TRIGGER,
		WAIT_FOR_RISING,
		WAIT_FOR_FALLING,
		SAMPLE,
		MEASURE,
		EXIT,
	};

	STATE _state{STATE::TRIGGER};



	PX4Rangefinder	_px4_rangefinder;

	perf_counter_t _comms_errors{perf_alloc(PC_COUNT, MODULE_NAME" comms errors")};
	perf_counter_t _sample_perf{perf_alloc(PC_ELAPSED, MODULE_NAME" read")};
	perf_counter_t _sensor_resets{perf_alloc(PC_COUNT, MODULE_NAME" resets")};
};