Abstraction around SDP8xx differential pressure sensor. More...

#include <nrfcxx/sensor/sdp8xx.hpp>

Inheritance diagram for nrfcxx::sensor::sdp8xx:

Data Structures
struct	iface_config_type
	Information required to communicate with a sensor instance. More...

struct	observations_type
	Storage for cached results. More...

Public Member Functions
const iface_config_type &	iface_config () const
	Access the interface configuration for the sensor.

	sdp8xx (notifier_type notify, iface_config_type &ifc)
	Construct a sensor interface around a TWI device and events.

	sdp8xx (const sdp8xx &)=delete

sdp8xx &	operator= (const sdp8xx &)=delete

	sdp8xx (sdp8xx &&)=delete

sdp8xx &	operator= (sdp8xx &)=delete

int	reset ()
	Send a soft-reset command to the SDP8xx. More...

int	read_device_info (uint32_t &product, uint64_t &serial)
	Read the device information. More...

const observations_type &	observations () const
	Retrieve the most recent observations calculated through the LPM infrastructure.

Public Member Functions inherited from nrfcxx::lpm::lpsm_capable
virtual int	lpsm_start ()
	Validate and prepare to initiate an LPM collection. More...

virtual int	lpsm_sample ()
	Ask the LPM infrastructure to initiate a new sample. More...

lpm::state_machine::process_flags_type	lpsm_process ()
	Make progress on an LPM collection. More...

int	lpsm_stop ()

int	lpsm_reset ()

int	lpsm_process_rc () const
	Get the internal result code from the last invocation of lpsm_process_(). More...

const lpm::state_machine &	machine () const
	Gain read-only access to the LPM machine state.

Static Public Attributes
constexpr static unsigned int	RESET_DELAY_ms = 2
	The maximum time required by the sensor to stabilize after reset(), in milliseconds.

constexpr static unsigned int	SAMPLE_DELAY_ms = 50
	The maximum time required for a one-shot measurement, in milliseconds.

constexpr static uint8_t	CONFIG_OTPRn = 0x02
	Bit set in configure() parameter/result to disable configuration reset on each measurement.

constexpr static uint8_t	CONFIG_HEATER = 0x04
	Bit set in configure() parameter/result to enable the on-chip heater.

constexpr static uint8_t	CONFIG_EOB = 0x40
	Bit set in configure() result indicating Vdd is below 2.25V.

constexpr static int	INVALID_OBSERVATION = -30000
	Value for observations that are known to be invalid. More...

static constexpr uint32_t	SDP800_500Pa_PN = 0x03020100
	Product number matcher for 500 Pa range manifold-connection device.

static constexpr uint32_t	SDP810_500Pa_PN = 0x03020A00
	Product number matcher for 500 Pa range tube-connection device.

static constexpr uint32_t	SDP800_125Pa_PN = 0x03020200
	Product number matcher for 125 Pa range manifold-connection device.

static constexpr uint32_t	SDP810_125Pa_PN = 0x03020B00
	Product number matcher for 125 Pa range tube-connection device.

Additional Inherited Members
Protected Types inherited from nrfcxx::lpm::lpsm_capable
using	state_type = state_machine::state_type

using	process_flags_type = state_machine::process_flags_type

Protected Member Functions inherited from nrfcxx::lpm::lpsm_capable
	lpsm_capable (notifier_type notify)
	Create a state machine that records state and supports delayed transitions. More...

virtual int	lpsm_process_ (int &delay, process_flags_type &pf)
	Override to implement machine-specific operations of lpsm_process(). More...

virtual void	lpsm_reset_ ()
	Override to reset state that is held outside the machine.

Protected Attributes inherited from nrfcxx::lpm::lpsm_capable
state_machine	machine_

Detailed Description

Abstraction around SDP8xx differential pressure sensor.

Interface to the SDP8xx digital differential pressure sensor.

The device supports either polled reading at a maximum rate of about 200 Hz, or continuous measurement at up to 2 kHz. The interface currently only supports polled reading, using an LPM state machine.

lpm::lpsm_capable::lpsm_process() for this sensor returns the following flags in addition to the diagnostic flags:

lpm::state_machine::PF_OBSERVATION

Member Function Documentation

◆ read_device_info()

int nrfcxx::sensor::sdp8xx::read_device_info	(	uint32_t &	product,
		uint64_t &	serial
	)

Read the device information.

Parameters

[out]	product	a 32-bit product identifier. The upper 24 bits match one of the product numbers (e.g. SDP810_125Pa_PN) while the low 8 bits are a revision number.
[out]	serial	a 64-bit unique serial number for the device.

◆ reset()

int nrfcxx::sensor::sdp8xx::reset ( )

Send a soft-reset command to the SDP8xx.

Warning: The SDP8xx is reset using the I2C bus standard broadcast hardware reset-and-write command. If other devices are on the bus they may be affected.

Returns: a non-negative value on success, or an encoded error.

Field Documentation

◆ INVALID_OBSERVATION

constexpr static int nrfcxx::sensor::sdp8xx::INVALID_OBSERVATION = -30000

staticconstexpr

Value for observations that are known to be invalid.

This fits in a 16-bit signed value and is outside the valid range for both temperature_cCel() and diffpres_cPa().

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

nrfcxx/sensor/sdp8xx.hpp

Data Structures

Public Member Functions

Static Public Attributes