MMA7660 Class Reference

API for the MMA7660 I2C 3-Axis Digital Accelerometer. More...

Detailed Description

• ID: mma7660
• Name: MMA7660 3-Axis Digital Accelerometer
• Other Names: Grove 3-Axis Digital Accelerometer (1.5g)
• Category: accelerometer
• Manufacturer: seeed
• Connection: i2c gpio

UPM module for the MMA7660 I2C 3-axis digital accelerometer. This device supports a variety of capabilities, including the generation of interrupts for various conditions, tilt and basic gesture detection, and X/Y/Z-axis measurements of g-forces being applied (up to 1.5g)

This module was tested with the Grove 3-Axis Digital Accelerometer (1.5g)

        // Instantiate an MMA7660 on I2C bus 0
        upm_mma7660.MMA7660 accel = new upm_mma7660.MMA7660(0);

        // place device in standby mode so we can write registers
        accel.setModeStandby();

        // enable 64 samples per second
        accel.setSampleRate(upm_mma7660.MMA7660.MMA7660_AUTOSLEEP_T.AUTOSLEEP_64);

        // place device into active mode
        accel.setModeActive();

        while (true) {
            int[] rawValues = accel.getRawValues();
            System.out.println("Raw Values: x = " + rawValues[0] + " y = " + rawValues[1] + " x = "
                    + rawValues[2]);

            float[] acceleration = accel.getAcceleration();
            System.out.println("Raw Values: x = " + acceleration[0] + " y = " + acceleration[1]
                    + " x = " + acceleration[2]);

            Thread.sleep(1000);
        }

Classes
class	MMA7660_AUTOSLEEP_T
class	MMA7660_INTR_T
class	MMA7660_MODE_T
class	MMA7660_REG_T
class	MMA7660_TILT_BF_T
class	MMA7660_TILT_LP_T

Public Member Functions
synchronized void	delete ()
	MMA7660 (int bus, short address)
	MMA7660 (int bus)
boolean	writeByte (short reg, short arg1)
short	readByte (short reg)
int[]	getRawValues ()
float[]	getAcceleration ()
int	getVerifiedAxis (MMA7660.MMA7660_REG_T axis)
short	getVerifiedTilt ()
void	setModeActive ()
void	setModeStandby ()
short	tiltBackFront ()
short	tiltLandscapePortrait ()
boolean	tiltTap ()
boolean	tiltShake ()
void	installISR (int pin, IsrCallback cb)
void	uninstallISR ()
boolean	setInterruptBits (short ibits)
boolean	setSampleRate (MMA7660.MMA7660_AUTOSLEEP_T sr)

Constructor & Destructor Documentation

MMA7660	(	int	bus,
		short	address
	)

MMA7660 constructor

Parameters

bus	I2C bus to use
address	Address for this sensor; default is 0x55

Member Function Documentation

float [] getAcceleration

(

)

Gets the computed acceleration

Returns

Array containing x, y, z. Free using delete.

int [] getRawValues

(

)

Reads the current value of conversion

Returns

Array containing x, y, z. Free using delete.

int getVerifiedAxis

(

MMA7660.MMA7660_REG_T

axis

)

Reads an axis, verifying its validity. The value passed must be one of REG_XOUT, REG_YOUT, or REG_ZOUT.

Parameters

axis	Axis to read

Returns

Axis value

short getVerifiedTilt

(

)

Reads the tilt register, verifying its validity

Returns

Tilt value

void installISR	(	int	pin,
		IsrCallback	cb
	)

Installs an interrupt service routine (ISR) to be called when an interrupt occurs

Parameters

pin	GPIO pin to use as the interrupt pin
fptr	Pointer to a function to be called on interrupt
arg	Pointer to an object to be supplied as an argument to the ISR.

short readByte

(

short

reg

)

Reads a byte value from a register

Parameters

reg	Register location to read from

Returns

Value in a specified register

boolean setInterruptBits

(

short

ibits

)

Enables interrupt generation based on passed interrupt bits. The bits are a bitmask of the requested MMA7660_INTR_T values. Note: the device must be in the standby mode to set this register.

Parameters

ibits

Sets the requested interrupt bits

Returns

True if successful

void setModeActive

(

)

Puts the device in the active mode. In this mode, register writes are not allowed. Place the device in the standby mode before attempting to write registers.

void setModeStandby

(

)

Puts the device in the standby (power saving) mode. Note: when in the standby mode, there is no valid data in the registers. In addition, the only way to write a register is to put the device in the standby mode.

boolean setSampleRate

(

MMA7660.MMA7660_AUTOSLEEP_T

sr

)

Sets the sampling rate of the sensor. The value supplied must be one of the MMA7660_AUTOSLEEP_T values.

Parameters

sr	One of the MMA7660_AUTOSLEEP_T values

Returns

True if successful

short tiltBackFront

(

)

Reads tiltBackFront bits

The value returned is one of the MMA7660_TILT_BF_T values

Returns

Bits corresponding to the BackFront tilt status

short tiltLandscapePortrait

(

)

Reads tiltLandscapePortrait bits

The value returned is one of the MMA7660_TILT_LP_T values

Returns

Bits corresponding to the LandscapePortrait tilt status

boolean tiltShake

(

)

Reads the tiltShake status

Returns

True if a shake is detected

boolean tiltTap

(

)

Reads the tiltTap status

Returns

True if a tap is detected

void uninstallISR

(

)

Uninstalls the previously installed ISR

boolean writeByte	(	short	reg,
		short	arg1
	)

Writes a byte value into a register

Parameters

reg	Register location to write into
byte	Byte to write

Returns

True if successful

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

• /var/lib/jenkins/workspace/upm-doc-stable/build-33/src/mma7660/MMA7660.java