upm
1.7.1
Sensor/Actuator repository for libmraa (v2.0.0)
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API for the MPL3115A2 Atmospheric Pressure Sensor. More...
Freescale Semiconductor* MPL3115A2 is a high-precision, ultra-low power consumption pressure sensor. Its operating range is 50-110 kPa.
Public Member Functions | |
MPL3115A2 (int bus, int devAddr=MPL3115A2_I2C_ADDRESS, uint8_t mode=6) | |
int | testSensor (void) |
int | resetSensor (void) |
void | dumpSensor (void) |
int | sampleData (void) |
int32_t | getPressureReg (int reg) |
int32_t | getTempReg (int reg) |
float | getPressure (int bSampleData=true) |
float | getTemperature (int bSampleData=true) |
float | getSealevelPressure (float altitudeMeters=0.0) |
float | getAltitude (float sealevelPressure=101325.0) |
void | setOversampling (uint8_t oversampling) |
uint8_t | getOversampling (void) |
float | getTemperatureMax (void) |
float | getTemperatureMin (void) |
float | getPressureMax (void) |
float | getPressureMin (void) |
float | convertTempCtoF (float fTemp) |
float | convertPaToinHg (float fPressure) |
mraa::Result | i2cWriteReg (uint8_t reg, uint8_t value) |
uint16_t | i2cReadReg_16 (int reg) |
uint8_t | i2cReadReg_8 (int reg) |
MPL3115A2 | ( | int | bus, |
int | devAddr = MPL3115A2_I2C_ADDRESS , |
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uint8_t | mode = 6 |
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int testSensor | ( | void | ) |
MPL3115A2 object destructor; basically, it closes the I2C connection. ~MPL3115A2(); no need for this here, as the I2c connection will be closed when the m_i2ControlCtx variable will go out of scope Tests the sensor and tries to determine if the sensor is operating by looking for small variations in the value
int resetSensor | ( | void | ) |
Performs a soft reset of the MPL3115A2 device to ensure it is in a known state. This function can be used to reset the min/max temperature and pressure values.
void dumpSensor | ( | void | ) |
Dumps out the I2C register block to stdout
int sampleData | ( | void | ) |
Initiates a temperature/pressure mesasurement and waits for the function to complete. Temperature and pressure registers can be read after this call.
int32_t getPressureReg | ( | int | reg | ) |
Reads the pressure value from MPL3115A2 [Pa * 100]
reg | Base address of the pressure register |
int32_t getTempReg | ( | int | reg | ) |
Reads the temperature value from MPL3115A2 [degC * 1000]
reg | Base address of the temperature register |
float getPressure | ( | int | bSampleData = true | ) |
Reads the current pressure value from MPL3115A2 [Pa]
bSampleData | Sets non-zero to a sample reading |
float getTemperature | ( | int | bSampleData = true | ) |
Reads the current temperature value from MPL3115A2 [degC]
bSampleData | Sets non-zero to a sample reading |
float getSealevelPressure | ( | float | altitudeMeters = 0.0 | ) |
Reads the current pressure and, using a known altitude, calculates the sea level pressure value [Pa] This function should be preceded by the sampleData() call
altitudeMeters | Altitude in meters |
float getAltitude | ( | float | sealevelPressure = 101325.0 | ) |
Reads the current pressure and, using a known sea level pressure, calculates the altitude value [m] This function should be preceded by the sampleData() call
sealevelPressure | Current sea level pressure |
void setOversampling | ( | uint8_t | oversampling | ) |
Defines the oversampling setting (ranges from 0 to 7). The value represents 2^n samples (ranging from 1 to 128). The time to calculate a sample is approximately (2^n * 4 + 2) ms
oversampling | New oversampling value |
uint8_t getOversampling | ( | void | ) |
Returns the current oversampling value
float getTemperatureMax | ( | void | ) |
Reads the maximum measured temperature [degC]
float getTemperatureMin | ( | void | ) |
Reads the minimum measured temperature [degC]
float getPressureMax | ( | void | ) |
Reads the maximum measured pressure [Pa]
float getPressureMin | ( | void | ) |
Reads the minimum measured pressure [Pa]
float convertTempCtoF | ( | float | fTemp | ) |
Converts temperature from degC*1000 to degF*1000
fTemp | Temperature in degC |
float convertPaToinHg | ( | float | fPressure | ) |
Converts pressure from Pa*100 to inHg*10000 This is set for 15degC (Pa = 0.0002961 in Hg) TODO: Change the function to add temperature calibration
fPressure | Pressure in Pa |
mraa::Result i2cWriteReg | ( | uint8_t | reg, |
uint8_t | value | ||
) |
Writes one byte to an I2C register
reg | Address of the register |
value | Byte to be written |
uint16_t i2cReadReg_16 | ( | int | reg | ) |
Reads two bytes from an I2C register
reg | Address of the register |
uint8_t i2cReadReg_8 | ( | int | reg | ) |
Reads a one-byte register
reg | Address of the register |