MMA7455 Class Reference

API for the MMA7455 Accelerometer. More...

Detailed Description

• ID: mma7455
• Name: Three Axis +/- 2/4/8 g Digital Accelerometer
• Category: accelerometer
• Manufacturer: generic
• Connection: i2c
• Link: http://www.nxp.com/products/sensors/accelerometers/3-axis-accelerometers/2g-4g-8g-low-g-digital-accelerometer:MMA745xL

This module defines the MMA7455 interface for libmma7455

    upm::MMA7455 sensor(0, ADDR);

    short x, y, z;
    while (!doWork) {
        sensor.readData(&x, &y, &z);
        std::cout << "Accelerometer X(" << x << ") Y(" << y << ") Z(" << z << ")" << std::endl;
        upm_delay_us(100000);
    }

Public Member Functions
	MMA7455 (int bus=0, int devAddr=0x1D)
std::string	name ()
mraa::Result	calibrate ()
mraa::Result	readData (short *ptrX, short *ptrY, short *ptrZ)
std::vector< short >	readData ()
int	i2cReadReg (unsigned char reg, uint8_t *buffer, int len)
mraa::Result	i2cWriteReg (unsigned char reg, uint8_t *buffer, int len)

Constructor & Destructor Documentation

MMA7455	(	int	bus = 0,
		int	devAddr = 0x1D
	)

Instantiates an MMA7455 object

Parameters

bus	Number of the used bus
devAddr	Address of the used I2C device

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Member Function Documentation

std::string name ( )

inline

Returns the name of the component

Returns

Name of the component

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mraa::Result calibrate

(

void

)

Calibrates the sensor

Returns

0 (MRAA_SUCCESS) if successful; non-zero otherwise

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mraa::Result readData	(	short *	ptrX,
		short *	ptrY,
		short *	ptrZ
	)

Reads X-axis, Y-axis, and Z-axis acceleration data

Parameters

ptrX	X-axis
ptrY	Y-axis
ptrZ	Z-axis

Returns

0 (MRAA_SUCCESS) if successful; non-zero otherwise

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std::vector< short > readData

(

)

Reads X-axis, Y-axis, and Z-axis acceleration data

Returns

std::vector containing X, Y, Z acceleration data

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int i2cReadReg	(	unsigned char	reg,
		uint8_t *	buffer,
		int	len
	)

Internal function for reading I2C data

Parameters

reg	Register address
buffer	Register data buffer
len	Buffer size

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mraa::Result i2cWriteReg	(	unsigned char	reg,
		uint8_t *	buffer,
		int	len
	)

Internal function for writing I2C data

Parameters

reg	Register address
buffer	Register data buffer
len	Buffer size

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

• src/mma7455/mma7455.hpp
• src/mma7455/mma7455.cxx