Simplifies reading Parallax MMA7455 3-Axis Accelerometer Module. More...

#include "simpletools.h"

Macros
#define	MMA7455_XOUTL 0x00
#define	MMA7455_XOUTH 0x01
#define	MMA7455_YOUTL 0x02
#define	MMA7455_YOUTH 0x03
#define	MMA7455_ZOUTL 0x04
#define	MMA7455_ZOUTH 0x05
#define	MMA7455_XOUT8 0x06
#define	MMA7455_YOUT8 0x07
#define	MMA7455_ZOUT8 0x08
#define	MMA7455_STATUS 0x09
#define	MMA7455_DETSRC 0x0A
#define	MMA7455_TOUT 0x0B
#define	MMA7455_I2CAD 0x0D
#define	MMA7455_USRINF 0x0E
#define	MMA7455_WHOAMI 0x0F
#define	MMA7455_XOFFL 0x10
#define	MMA7455_XOFFH 0x11
#define	MMA7455_YOFFL 0x12
#define	MMA7455_YOFFH 0x13
#define	MMA7455_ZOFFL 0x14
#define	MMA7455_ZOFFH 0x15
#define	MMA7455_MCTL 0x16
#define	MMA7455_INTRST 0x17
#define	MMA7455_CTL1 0x18
#define	MMA7455_CTL2 0x19
#define	MMA7455_LDTH 0x1A
#define	MMA7455_PDTH 0x1B
#define	MMA7455_PW 0x1C
#define	MMA7455_LT 0x1D
#define	MMA7455_TW 0x1E
#define	MMA7455_STANDBY 0b00
#define	MMA7455_MEASUREMENT 0b01
#define	MMA7455_LEVEL_DETECT 0b10
#define	MMA7455_PULSE_DETECT 0b11

Functions
void	MMA7455_init (int pinData, int pinClock, int pinEnable)
	Initialize the sensor.
void	MMA7455_getxyz8 (signed char x, signed char y, signed char *z)
	Get 8 bit x, y, and z axis measurements.
void	MMA7455_getxyz10 (signed short x, signed short y, signed short *z)
	Get 10 bit x, y, and z axis measurements.
void	MMA7455_setOffsetX (signed short offset)
	Set value automatically added to X value measurement. Start with value that's twice the zero offset error, and repeat the test. It may take a several iterations.
void	MMA7455_setOffsetY (signed short offset)
	Set value automatically added to Y value measurement. Start with value that's twice the zero offset error, and repeat the test. It may take a several iterations.
void	MMA7455_setOffsetZ (signed short offset)
	Set value automatically added to Z value measurement. Start with value that's twice the zero offset error, and repeat the test. It may take a several iterations.
unsigned char	MMA7455_getMode ()
	Get the mode of operation: (0) standby, (1) measurement, (2) level error detection, (3) pulse impact detection.
void	MMA7455_setMode (unsigned char mode)
	Set the mode of operation: (0) standby, (1) measurement, (2) level error detection, (3) pulse impact detection.
void	MMA7455_gRange (unsigned char range)
	Set the g measurement range to +/- 2, +/-4, or +/- 8 g.
void	MMA7455_writeByte (unsigned char address, unsigned char value)
	write a byte value to an MMA7455 register
unsigned char	MMA7455_readByte (unsigned char address)
	Read a value from an MMA7455 register.

Variables
int	MMA7455_pinDat
int	MMA7455_pinClk
int	MMA7455_pinEn
int	MMA7455_gRangeVal

Detailed Description

Simplifies reading Parallax MMA7455 3-Axis Accelerometer Module.

Author: Andy Lindsay

Version: 0.5

Copyright: Copyright (C) Parallax, Inc. 2014. All Rights MIT Licensed.

Macro Definition Documentation

#define MMA7455_CTL1 0x18

MMA7455 CTL1 Register = 0x18.

#define MMA7455_CTL2 0x19

MMA7455 CTL2 Register = 0x19.

#define MMA7455_DETSRC 0x0A

MMA7455 DETSRC Register = 0x0A.

#define MMA7455_I2CAD 0x0D

MMA7455 I2CAD Register = 0x0D.

#define MMA7455_INTRST 0x17

MMA7455 INTRST Register = 0x17.

#define MMA7455_LDTH 0x1A

MMA7455 LDTH Register = 0x1A.

#define MMA7455_LEVEL_DETECT 0b10

MMA7455_LEVEL_DETECT can be used with the MMA7455_setMode and getMode functions. Its value is 2, the level detect mode value.

#define MMA7455_LT 0x1D

MMA7455 LT Register = 0x1D.

#define MMA7455_MCTL 0x16

MMA7455 MCTL Register = 0x16.

#define MMA7455_MEASUREMENT 0b01

MMA7455_MEASUREMENT can be used with the MMA7455_setMode and getMode functions. Its value is 1, the measurement mode value.

#define MMA7455_PDTH 0x1B

MMA7455 PDTH Register = 0x1B.

#define MMA7455_PULSE_DETECT 0b11

MMA7455_PULSE_DETECT can be used with the MMA7455_setMode and getMode functions. Its value is 3, the pulse detect mode value.

#define MMA7455_PW 0x1C

MMA7455 PW Register = 0x1C.

#define MMA7455_STANDBY 0b00

MMA7455_STANDBY can be used with the MMA7455_setMode and getMode functions. Its value is 0, the standby mode value.

#define MMA7455_STATUS 0x09

MMA7455 STATUS Register = 0x09.

#define MMA7455_TOUT 0x0B

MMA7455 TOUT Register = 0x0B.

#define MMA7455_TW 0x1E

MMA7455 TW Register = 0x1E.

#define MMA7455_USRINF 0x0E

MMA7455 USRINF Register = 0x0E.

#define MMA7455_WHOAMI 0x0F

MMA7455 WHOAMI Register = 0x0F.

#define MMA7455_XOFFH 0x11

MMA7455 XOFFH Register = 0x11.

#define MMA7455_XOFFL 0x10

MMA7455 XOFFL Register = 0x10.

#define MMA7455_XOUT8 0x06

MMA7455 XOUT8 Register = 0x06.

#define MMA7455_XOUTH 0x01

MMA7455 XOUTH Register = 0x01.

#define MMA7455_XOUTL 0x00

MMA7455 XOUTL Register = 0x00.

#define MMA7455_YOFFH 0x13

MMA7455 YOFFH Register = 0x13.

#define MMA7455_YOFFL 0x12

MMA7455 YOFFL Register = 0x12.

#define MMA7455_YOUT8 0x07

MMA7455 YOUT8 Register = 0x07.

#define MMA7455_YOUTH 0x03

MMA7455 YOUTH Register = 0x03.

#define MMA7455_YOUTL 0x02

MMA7455 YOUTL Register = 0x02.

#define MMA7455_ZOFFH 0x15

MMA7455 ZOFFH Register = 0x15.

#define MMA7455_ZOFFL 0x14

MMA7455 ZOFFL Register = 0x14.

#define MMA7455_ZOUT8 0x08

MMA7455 ZOUT8 Register = 0x08.

#define MMA7455_ZOUTH 0x05

MMA7455 ZOUTH Register = 0x05.

#define MMA7455_ZOUTL 0x04

MMA7455 ZOUTL Register = 0x04.

Function Documentation

unsigned char MMA7455_getMode ( )

Get the mode of operation: (0) standby, (1) measurement, (2) level error detection, (3) pulse impact detection.

Returns: mode Value from 0 to 3.

void MMA7455_getxyz10	(	signed short *	x,
		signed short *	y,
		signed short *	z
	)

Get 10 bit x, y, and z axis measurements.

Parameters

*x	Address pointer to a signed short x variable.
*y	Address pointer to a signed short y variable.
*z	Address pointer to a signed short z variable.

void MMA7455_getxyz8	(	signed char *	x,
		signed char *	y,
		signed char *	z
	)

Get 8 bit x, y, and z axis measurements.

Parameters

*x	Address pointer to a signed char x variable.
*y	Address pointer to a signed char y variable.
*z	Address pointer to a signed char z variable.

void MMA7455_gRange ( unsigned char range )

Set the g measurement range to +/- 2, +/-4, or +/- 8 g.

Parameters

range Valid range values are 2, 4, and 8.

void MMA7455_init	(	int	pinData,
		int	pinClock,
		int	pinEnable
	)

Initialize the sensor.

Parameters

pinData	I/O pin connected to the DATA pin.
pinClock	I/O pin connected to the CLK pin.
pinEnable	I/O pin connected to the /ENABLE pin.

unsigned char MMA7455_readByte ( unsigned char address )

Read a value from an MMA7455 register.

Parameters

address MMA7455 register address.

Returns: Value stored by the MMA7455 register.

void MMA7455_setMode ( unsigned char mode )

Set the mode of operation: (0) standby, (1) measurement, (2) level error detection, (3) pulse impact detection.

Parameters

mode	Value from 0 to 3.

void MMA7455_setOffsetX ( signed short offset )

Set value automatically added to X value measurement. Start with value that's twice the zero offset error, and repeat the test. It may take a several iterations.

Parameters

offset Twice the value you want the chip to add to the x axis measurement

void MMA7455_setOffsetY ( signed short offset )

Set value automatically added to Y value measurement. Start with value that's twice the zero offset error, and repeat the test. It may take a several iterations.

Parameters

offset Twice the value you want the chip to add to the y axis measurement

void MMA7455_setOffsetZ ( signed short offset )

Set value automatically added to Z value measurement. Start with value that's twice the zero offset error, and repeat the test. It may take a several iterations.

Parameters

offset Twice the value you want the chip to add to the z axis measurement

void MMA7455_writeByte	(	unsigned char	address,
		unsigned char	value
	)

write a byte value to an MMA7455 register

Parameters

address	MMA7455 register address.
value	Configuration value for the register.

Variable Documentation

int MMA7455_gRangeVal

Global variable for MMA7455 module's current gravity range setting.

int MMA7455_pinClk

Global variable for I/O pinconnected to MMA7455 module's CLK pin.

int MMA7455_pinDat

Global variable for I/O pinconnected to MMA7455 module's DATA pin.

int MMA7455_pinEn

Global variable for I/O pinconnected to MMA7455 module's /CS pin.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation