Barometer, Altimeter, Temperature sensor

Functions
void	MPL3115A2_Initialize (void)
	Initialize the sensor and enable interrupts. More...
unsigned char	MPL3115A2_ID (void)
	Returns the Factory Chip ID. More...
unsigned char	MPL3115A2_GetMode (void)
	Return a bool value indicating wheather the sensor is in Active or Standby mode. More...
void	MPL3115A2_StandbyMode (void)
	Puts the sensor in standby mode, the user must do this in order to modify the major control registers. More...
void	MPL3115A2_ActiveMode (void)
	Puts the sensor in active mode, needed is the sensor is in standby mode. More...
void	MPL3115A2_AltimeterMode (void)
	Sets the mode to Altimeter. More...
float	MPL3115A2_ReadAltitude (void)
	Returns the number of meters above sea level,Returns -1 if no new data is available. More...
void	MPL3115A2_SetAltimeterOffset (unsigned char H_Offset)
	Set the altimeter offset correction. More...
void	MPL3115A2_BarometerMode (void)
	Configure the sensor in Barometer mode. More...
void	MPL3115A2_SetPressureOffset (unsigned char P_Offset)
	Set the pressure offset correction. More...
float	MPL3115A2_GetMinimumPressure (void)
	Get minimum stored pressure. More...
float	MPL3115A2_GetMaximumPressure (void)
	Get maximum stored pressure. More...
unsigned int	MPL3115A2_ReadBarometicPressureInput (void)
	Returns barometric pressure input used for calculating altitude. More...
float	MPL3115A2_ReadBarometricPressure (void)
	Reads the current pressure in Pa. More...
float	MPL3115A2_ReadPressure (unitsType units)
	Get a barometric pressure reading. More...
void	MPL3115A2_SetPressureAlarmThreshold (unsigned int thresh)
	Configure alarm threshold. More...
void	MPL3115A2_SetPressureTargetWindow (unsigned int target, unsigned int window)
	Configure alarm target and window. More...
float	MPL3115A2_ReadTemperature (void)
	Get a temperature reading from the sensor. More...
float	MPL3115A2_GetMinimumTemperature (void)
	Get minimum recorded temperature reading. More...
float	MPL3115A2_GetMaximumTemperature (void)
	Get maximum recorded temperature reading. More...
void	MPL3115A2_SetTempTargetWindow (unsigned int target, unsigned int window)
	Configures the temperature target and window for the interrupts. More...
void	MPL3115A2_SetTemperatureThreshold (unsigned char thresh)
	Configure the temeperature threshold. More...
void	MPL3115A2_SetTempOffset (char T_Offset)
	Used to correct the measured sensor temeperature by a particular offset. More...
void	MPL3115A2_OutputSampleRate (unsigned char sampleRate)
	Configures the output sample rate.The higher the oversample rate the greater the time between data samples. More...
void	MPL3115A2_SetAcquisitionTimeStep (unsigned char ST_Value)
	Set the acquisition time step in seconds. More...
void	MPL3115A2_EnableEventFlags (void)
	Enables the pressure and temp measurement event flags so that we can test against them. This is recommended during setup. More...
void	MPL3115A2_ToggleOneShot (void)
	Causes the sensor to immediately take another reading , needed to sample faster than 1Hz. More...
void	MPL3115A2_ConfigureInterruptPin (unsigned char intrrpt, unsigned char pin)
	Configure Interrupt pins. More...
void	MPL3115A2_ConfigurePressureInterrupt (void)
	Configure Pressure Interrupt. More...
void	MPL3115A2_ConfigureAltitudeInterrupt (void)
	Configure altitude interrupt pin. More...
void	MPL3115A2_ClearInterrupts (void)
	Clear any existing interrupts. More...

Detailed Description

These functions let you communicate with the MPL3115A2 Barometer/Altimeter/Temperature sensor

Function Documentation

void MPL3115A2_ActiveMode

(

void

)

Puts the sensor in active mode, needed is the sensor is in standby mode.

Returns

none

Definition at line 82 of file MPL3115A2.c.

void MPL3115A2_AltimeterMode

(

void

)

Sets the mode to Altimeter.

Returns

none

Definition at line 93 of file MPL3115A2.c.

void MPL3115A2_BarometerMode

(

void

)

Configure the sensor in Barometer mode.

Returns

none

Definition at line 135 of file MPL3115A2.c.

void MPL3115A2_ClearInterrupts

(

void

)

Clear any existing interrupts.

Returns

none

Definition at line 450 of file MPL3115A2.c.

void MPL3115A2_ConfigureAltitudeInterrupt

(

void

)

Configure altitude interrupt pin.

Returns

none

Definition at line 441 of file MPL3115A2.c.

void MPL3115A2_ConfigureInterruptPin	(	unsigned char	intrrpt,
		unsigned char	pin
	)

Configure Interrupt pins.

Parameters

intrrpt	Register to read value form
pin	One of the two pins.

Returns

none

Definition at line 423 of file MPL3115A2.c.

void MPL3115A2_ConfigurePressureInterrupt

(

void

)

Configure Pressure Interrupt.

Returns

none

Definition at line 432 of file MPL3115A2.c.

void MPL3115A2_EnableEventFlags

(

void

)

Enables the pressure and temp measurement event flags so that we can test against them. This is recommended during setup.

Returns

none

Definition at line 398 of file MPL3115A2.c.

float MPL3115A2_GetMaximumPressure

(

void

)

Get maximum stored pressure.

Returns

pressure Maximum stored pressure during active measurement mode

Definition at line 178 of file MPL3115A2.c.

float MPL3115A2_GetMaximumTemperature

(

void

)

Get maximum recorded temperature reading.

Returns

temp Maximum temperature as a floating point number

Definition at line 312 of file MPL3115A2.c.

float MPL3115A2_GetMinimumPressure

(

void

)

Get minimum stored pressure.

Returns

pressure Minimum stored pressure during active measurement mode

Definition at line 162 of file MPL3115A2.c.

float MPL3115A2_GetMinimumTemperature

(

void

)

Get minimum recorded temperature reading.

Returns

temp Maximum temperature as a floating point number

Definition at line 297 of file MPL3115A2.c.

unsigned char MPL3115A2_GetMode

(

void

)

Return a bool value indicating wheather the sensor is in Active or Standby mode.

Returns

status True if in Active mode, False otherwise

Definition at line 61 of file MPL3115A2.c.

unsigned char MPL3115A2_ID

(

void

)

Returns the Factory Chip ID.

Returns

ID Chip ID as byte

Definition at line 51 of file MPL3115A2.c.

void MPL3115A2_Initialize

(

void

)

Initialize the sensor and enable interrupts.

Returns

none

Definition at line 40 of file MPL3115A2.c.

void MPL3115A2_OutputSampleRate

(

unsigned char

sampleRate

)

Configures the output sample rate.The higher the oversample rate the greater the time between data samples.

Parameters

sampleRate

Constant that determines the sample rate

Returns

none

Definition at line 361 of file MPL3115A2.c.

float MPL3115A2_ReadAltitude

(

void

)

Returns the number of meters above sea level,Returns -1 if no new data is available.

Returns

altitude Altitude from sea-level in meters

Definition at line 107 of file MPL3115A2.c.

unsigned int MPL3115A2_ReadBarometicPressureInput

(

void

)

Returns barometric pressure input used for calculating altitude.

Returns

pressure Equivalent sea level pressure

Definition at line 193 of file MPL3115A2.c.

float MPL3115A2_ReadBarometricPressure

(

void

)

Reads the current pressure in Pa.

Returns

Pressure Pressure in Pa

Definition at line 205 of file MPL3115A2.c.

float MPL3115A2_ReadPressure

(

unitsType

units

)

Get a barometric pressure reading.

Parameters

units

One of the unitsType

Returns

Pressure Pressure in units

Definition at line 230 of file MPL3115A2.c.

float MPL3115A2_ReadTemperature

(

void

)

Get a temperature reading from the sensor.

Returns

Temperature as a floating point number

Definition at line 282 of file MPL3115A2.c.

void MPL3115A2_SetAcquisitionTimeStep

(

unsigned char

ST_Value

)

Set the acquisition time step in seconds.

Parameters

ST_Value

timeStep is set from 0x1 - 0xF corresponding steps 1 - 32,768 seconds.

Returns

none

Definition at line 380 of file MPL3115A2.c.

void MPL3115A2_SetAltimeterOffset

(

unsigned char

H_Offset

)

Set the altimeter offset correction.

Parameters

H_Offset

Altitude in meters ,range varies from -128 to +127 meters

Returns

none

Definition at line 123 of file MPL3115A2.c.

void MPL3115A2_SetPressureAlarmThreshold

(

unsigned int

thresh

)

Configure alarm threshold.

Parameters

thresh

reister to read value form

Returns

none

Definition at line 251 of file MPL3115A2.c.

void MPL3115A2_SetPressureOffset

(

unsigned char

P_Offset

)

Set the pressure offset correction.

Parameters

P_Offset

Offset varies from -128 to +128 Pa, 4 Pa per LSB

Returns

none

Definition at line 150 of file MPL3115A2.c.

void MPL3115A2_SetPressureTargetWindow	(	unsigned int	target,
		unsigned int	window
	)

Configure alarm target and window.

Parameters

target	Contents of target register.
window	Contents of window register that activates the interrupt

Returns

none

Definition at line 265 of file MPL3115A2.c.

void MPL3115A2_SetTemperatureThreshold

(

unsigned char

thresh

)

Configure the temeperature threshold.

Parameters

thresh

Temperature threshold.

Returns

none

Definition at line 340 of file MPL3115A2.c.

void MPL3115A2_SetTempOffset

(

char

T_Offset

)

Used to correct the measured sensor temeperature by a particular offset.

Parameters

T_Offset

The temperature offset as a two's complement number.

Returns

none

Definition at line 351 of file MPL3115A2.c.

void MPL3115A2_SetTempTargetWindow	(	unsigned int	target,
		unsigned int	window
	)

Configures the temperature target and window for the interrupts.

Parameters

target	The target temeprature
window	Temperature window around the target.

Returns

Definition at line 329 of file MPL3115A2.c.

void MPL3115A2_StandbyMode

(

void

)

Puts the sensor in standby mode, the user must do this in order to modify the major control registers.

Returns

none

Definition at line 71 of file MPL3115A2.c.

void MPL3115A2_ToggleOneShot

(

void

)

Causes the sensor to immediately take another reading , needed to sample faster than 1Hz.

Returns

none

Definition at line 407 of file MPL3115A2.c.