MEASAirspeed Class Reference

Inheritance diagram for MEASAirspeed:

Collaboration diagram for MEASAirspeed:

Public Member Functions
	MEASAirspeed (int bus, int address=I2C_ADDRESS_MS4525DO, const char *path=PATH_MS4525)
Public Member Functions inherited from Airspeed
	Airspeed (int bus, int address, unsigned conversion_interval, const char *path)
virtual	~Airspeed ()
virtual int	init ()
virtual int	ioctl (device::file_t *filp, int cmd, unsigned long arg)

Protected Member Functions
void	Run () override
	Perform a poll cycle; collect from the previous measurement and start a new one. More...
int	measure () override
int	collect () override
void	voltage_correction (float &diff_pres_pa, float &temperature)
	Correct for 5V rail voltage variations. More...
Protected Member Functions inherited from Airspeed
virtual int	probe ()
void	start ()
	Initialise the automatic measurement state machine and start it. More...
void	stop ()
	Stop the automatic measurement state machine. More...
void	new_report (const differential_pressure_s &report)
	add a new report to the reports queue More...

Protected Attributes
math::LowPassFilter2p	_filter {MEAS_RATE, MEAS_DRIVER_FILTER_FREQ}
int	_t_system_power {-1}
system_power_s	system_power {}
Protected Attributes inherited from Airspeed
bool	_sensor_ok
int	_measure_interval
bool	_collect_phase
float	_diff_pres_offset
orb_advert_t	_airspeed_pub
int	_airspeed_orb_class_instance
int	_class_instance
unsigned	_conversion_interval
perf_counter_t	_sample_perf
perf_counter_t	_comms_errors

Detailed Description

Definition at line 77 of file ms4525_airspeed.cpp.

Constructor & Destructor Documentation

MEASAirspeed()

MEASAirspeed::MEASAirspeed	(	int	bus,
		int	address = I2C_ADDRESS_MS4525DO,
		const char *	path = PATH_MS4525
	)

Definition at line 108 of file ms4525_airspeed.cpp.

References DRV_DIFF_PRESS_DEVTYPE_MS4525.

Referenced by meas_airspeed::start_bus().

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Member Function Documentation

collect()

int MEASAirspeed::collect ( )

overrideprotectedvirtual

Implements Airspeed.

Definition at line 128 of file ms4525_airspeed.cpp.

References Airspeed::_airspeed_pub, Airspeed::_comms_errors, Airspeed::_diff_pres_offset, _filter, Airspeed::_sample_perf, math::LowPassFilter2p::apply(), differential_pressure_s::device_id, differential_pressure_s::differential_pressure_filtered_pa, differential_pressure_s::differential_pressure_raw_pa, differential_pressure_s::error_count, hrt_absolute_time(), OK, ORB_ID, orb_publish(), perf_begin(), perf_count(), perf_end(), perf_event_count(), status, differential_pressure_s::temperature, differential_pressure_s::timestamp, and voltage_correction().

Referenced by Run().

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measure()

int MEASAirspeed::measure ( )

overrideprotectedvirtual

Implements Airspeed.

Definition at line 114 of file ms4525_airspeed.cpp.

References Airspeed::_comms_errors, OK, and perf_count().

Referenced by Run().

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Run()

void MEASAirspeed::Run ( )

overrideprotectedvirtual

Perform a poll cycle; collect from the previous measurement and start a new one.

Implements Airspeed.

Definition at line 227 of file ms4525_airspeed.cpp.

References Airspeed::_collect_phase, Airspeed::_measure_interval, Airspeed::_sensor_ok, collect(), CONVERSION_INTERVAL, DEVICE_DEBUG, measure(), OK, and Airspeed::start().

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voltage_correction()

void MEASAirspeed::voltage_correction ( float &  diff_press_pa, float &  temperature  )

protected

Correct for 5V rail voltage variations.

correct for 5V rail voltage if the system_power ORB topic is available

See http://uav.tridgell.net/MS4525/MS4525-offset.png for a graph of offset versus voltage for 3 sensors

Definition at line 283 of file ms4525_airspeed.cpp.

References _t_system_power, f(), orb_check(), orb_copy(), ORB_ID, orb_subscribe(), system_power, and system_power_s::voltage5v_v.

Referenced by collect().

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Member Data Documentation

_filter

math::LowPassFilter2p MEASAirspeed::_filter {MEAS_RATE, MEAS_DRIVER_FILTER_FREQ}

protected

Definition at line 92 of file ms4525_airspeed.cpp.

Referenced by collect().

_t_system_power

int MEASAirspeed::_t_system_power {-1}

protected

Definition at line 99 of file ms4525_airspeed.cpp.

Referenced by voltage_correction().

system_power

system_power_s MEASAirspeed::system_power {}

protected

Definition at line 100 of file ms4525_airspeed.cpp.

Referenced by voltage_correction().

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The documentation for this class was generated from the following file:

• src/drivers/differential_pressure/ms4525/ms4525_airspeed.cpp