#include <BMP085.h>

Inheritance diagram for BMP085:

Collaboration diagram for BMP085:

Classes
struct	param_t

Public Types
enum	Mode { ULTRA_LOW_POWER = 0, STANDARD = 1, HIGH_RESOLUTION = 2, ULTRA_HIGH_RESOLUTION = 3 }

Public Member Functions
	BMP085 (TWI &twi)

bool	begin (Mode mode=ULTRA_LOW_POWER)

bool	sample_temperature_request ()

bool	read_temperature ()

bool	sample_temperature ()

bool	sample_pressure_request ()

bool	read_pressure ()

bool	sample_pressure ()

bool	sample ()

int16_t	temperature () const

int32_t	pressure () const

Protected Types
enum	reg_t { COEFF_REG = 0xAA, CMD_REG = 0xF4, RES_REG = 0xF6 }

enum	cmd_t { TEMP_CONV_CMD = 0x2E, PRESSURE_CONV_CMD = 0x34 }

Protected Member Functions
bool	acquire ()

bool	release ()

int	read (void *buf, size_t count)

int	write (const void *buf, size_t count)

int	write (iovec_t *vp)

Protected Attributes
param_t	m_param

Mode	m_mode

uint8_t	m_cmd

uint16_t	m_start

int32_t	B5

int32_t	m_pressure

TWI &	m_twi

uint8_t	m_addr

Static Protected Attributes
static const uint16_t	TEMP_CONV_MS = 5

Detailed Description

TWI Device Driver for the Bosch BMP085 Digital Pressure Sensor.

Circuit

The GY-80 10DOF module with pull-up resistors (4K7) for TWI signals and internal 3V3 voltage converter.

                          GY-80
                      +------------+
(VCC)---------------1-|VCC         |
                    2-|3V3         |
(GND)---------------3-|GND         |
(A5/SCL)------------4-|SCL         |
(A4/SDA)------------5-|SDA         |
                    6-|M-DRDY      |
                    7-|A-INT1      |
                    8-|T-INT1      |
                    9-|P-XCLR      |
(Dn/EXTn)----------10-|P-EOC       |
                      +------------+

References

http://media.digikey.com/pdf/Data%20Sheets/Bosch/BMP085.pdf BST-BMP085-DS000-03, Rev. 1.0, 01 July 2008.

Definition at line 50 of file BMP085.h.

Member Enumeration Documentation

enum BMP085::cmd_t

protected

Measurement/Control register value (chap. 4.4, pp. 16).

Enumerator
TEMP_CONV_CMD	Temperature conversion command.
PRESSURE_CONV_CMD	Pressure conversion command.

Definition at line 325 of file BMP085.h.

enum BMP085::Mode

Oversampling modes (table, pp. 10).

Enumerator
ULTRA_LOW_POWER
STANDARD
HIGH_RESOLUTION
ULTRA_HIGH_RESOLUTION

Definition at line 55 of file BMP085.h.

enum BMP085::reg_t

protected

EEPROM parameters, command and result registers (chap. 4.5, pp. 17). Parameter and result registers are 16-bit, in big-endian order.

Enumerator
COEFF_REG	Calibration coefficients register address.
CMD_REG	Command register address (8-bit).
RES_REG	Result register address (16-bit).

Definition at line 316 of file BMP085.h.

Constructor & Destructor Documentation

BMP085::BMP085 ( TWI & twi )

inline

Construct BMP085 driver with I2C address(0x77) and default ULTRA_LOW_POWER mode.

Definition at line 66 of file BMP085.h.

Member Function Documentation

bool TWI::Device::acquire ( )

inlineinherited

Start transaction. Return true(1) if successful otherwise false(0).

Returns: bool.

Definition at line 52 of file TWI.h.

bool BMP085::begin ( Mode mode = ULTRA_LOW_POWER )

inline

Initiate device driver. Load calibration coefficients from device. Return true(1) if successful otherwise false(0).

Parameters

[in] mode oversampling (Default ULTRA_LOW_POWER).

Returns: bool.

Definition at line 81 of file BMP085.h.

int32_t BMP085::pressure ( ) const

inline

Return latest calculated pressure from temperature and pressure raw sensor data.

Returns: calculated pressure in steps of 1 Pa (0,01 hPa).

Definition at line 285 of file BMP085.h.

int TWI::Device::read	(	void *	buf,
		size_t	count
	)

inlineinherited

Read data from device to given buffer.

Parameters

[in]	buf	buffer pointer.
[in]	count	buffer size in bytes.

Returns: number of bytes read or negative error code.

Definition at line 73 of file TWI.h.

bool BMP085::read_pressure ( )

inline

Read the raw pressure sensor. Will wait for the conversion to complete. Return true(1) if successful otherwise false(0).

Returns: bool.

Pressure conversion time max table (ms), index with mode.

Definition at line 194 of file BMP085.h.

bool BMP085::read_temperature ( )

inline

Read the raw temperature sensor. Will wait for the conversion to complete. Return true(1) if successful otherwise false(0).

Returns: bool.

Definition at line 129 of file BMP085.h.

bool TWI::Device::release ( )

inlineinherited

Stop transaction. Return true(1) if successful otherwise false(0).

Returns: bool.

Definition at line 62 of file TWI.h.

bool BMP085::sample ( )

inline

Sample and read the raw temperature and pressure sensor. Return true(1) if successful otherwise false(0). Retrieve calculated values with temperature() and pressure().

Returns: bool.

Definition at line 264 of file BMP085.h.

bool BMP085::sample_pressure ( )

inline

Sample and read the raw pressure sensor. Return true(1) if successful otherwise false(0).

Returns: bool.

Definition at line 252 of file BMP085.h.

bool BMP085::sample_pressure_request ( )

inline

Issue a sample request of the raw pressure sensor. Return true(1) if successful otherwise false(0).

Returns: bool.

Definition at line 172 of file BMP085.h.

bool BMP085::sample_temperature ( )

inline

Sample the raw temperature sensor and read. Return true(1) if successful otherwise false(0).

Returns: bool.

Definition at line 162 of file BMP085.h.

bool BMP085::sample_temperature_request ( )

inline

Issue a sample raw temperature sensor request. Return true(1) if successful otherwise false.

Returns: bool.

Definition at line 107 of file BMP085.h.

int16_t BMP085::temperature ( ) const

inline

Calculate temperature from the latest raw sensor reading.

Returns: calculated temperature in steps of 0.1 C

Definition at line 274 of file BMP085.h.

int TWI::Device::write	(	const void *	buf,
		size_t	count
	)

inlineinherited

Write data from the given buffer to device.

Parameters

[in]	buf	buffer pointer.
[in]	count	buffer size in bytes.

Returns: number of bytes written or negative error code.

Definition at line 84 of file TWI.h.

int TWI::Device::write ( iovec_t * vp )

inlineinherited

Write data to device with from given io vector.

Parameters

[in] vp io vector pointer.

Returns: number of bytes written or negative error code.

Definition at line 94 of file TWI.h.

Member Data Documentation

int32_t BMP085::B5

protected

Common intermediate temperature factor.

Definition at line 343 of file BMP085.h.

uint8_t TWI::Device::m_addr

protectedinherited

Device address.

Definition at line 104 of file TWI.h.

uint8_t BMP085::m_cmd

protected

Currrent command.

Definition at line 337 of file BMP085.h.

Mode BMP085::m_mode

protected

Pressure conversion mode.

Definition at line 334 of file BMP085.h.

param_t BMP085::m_param

protected

Device calibration data (from EEPROM data registers).

Definition at line 331 of file BMP085.h.

int32_t BMP085::m_pressure

protected

Latest calculated pressure.

Definition at line 346 of file BMP085.h.

uint16_t BMP085::m_start

protected

Sample request start time (ms).

Definition at line 340 of file BMP085.h.

TWI& TWI::Device::m_twi

protectedinherited

Two-Wire Interface Manager.

Definition at line 101 of file TWI.h.

const uint16_t BMP085::TEMP_CONV_MS = 5

staticprotected

Temperature conversion time max (ms).

Definition at line 292 of file BMP085.h.

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

src/Driver/BMP085.h

Classes

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Static Protected Attributes

Detailed Description

Circuit

References

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation