Accelerometer

Macros
#define	DOUTX   0x06
#define	DOUTX   0x06
#define	DOUTY   0x07
#define	DOUTY   0x07
#define	DOUTZ   0x08
#define	DOUTZ   0x08
#define	TICKSPERUS   (F_CPU/ 1000000)
#define	ACCEL_INT_IN   P2IN
#define	ACCEL_INT_OUT   P2OUT
#define	ACCEL_INT_DIR   P2DIR
#define	ACCEL_SCK_SEL   P2SEL
#define	ACCEL_INT_IE   P2IE
#define	ACCEL_INT_IES   P2IES
#define	ACCEL_INT_IFG   P2IFG
#define	ACCEL_INT_VECTOR   PORT2_VECTOR
#define	ACCEL_OUT   P3OUT
#define	ACCEL_DIR   P3DIR
#define	ACCEL_SEL   P3SEL
#define	ACCEL_INT   BIT5
#define	ACCEL_CS   BIT5
#define	ACCEL_SIMO   BIT3
#define	ACCEL_SOMI   BIT4
#define	ACCEL_SCK   BIT7
#define	ACCEL_PWR   BIT6
#define	REVID   0x01
#define	CTRL   0x02
#define	MODE_400   0x04
#define	G_RANGE_2   0x80
#define	I2C_DIS   0x10

Typedefs
typedef enum accel_state_t	accel_state_t
	Enumerate possible states for the accelerometer finite state machine (FSM)

Enumerations
enum	accel_state_t {   STATE_ACCEL_NONE, STATE_ACCEL_XREQ, STATE_ACCEL_XRDY, STATE_ACCEL_YREQ,   STATE_ACCEL_YRDY, STATE_ACCEL_ZREQ, STATE_ACCEL_ZRDY, STATE_ACCEL_DONE }
	Enumerate possible states for the accelerometer finite state machine (FSM) More...

Functions
void	Cma3000_init (volatile SampleBuffer *samplebuffer)
	Configures the CMA3000-D01 3-Axis Ultra Low Power Accelerometer. More...
void	Cma3000_disable (void)
	Disables the CMA3000-D01 3-Axis Ultra Low Power Accelerometer.
void	Cma3000_readAccel (void)
	Reads data from the accelerometer.
int8_t	Cma3000_readRegister (uint8_t Address)
	Reads data from the accelerometer. More...
void	Cma3000_readAccelFSM (void)
	Commence reading of data into the SampleBuffer.
accel_state_t	Cma3000_getState (void)
	Get the current state of the accelerometer. More...
int8_t	Cma3000_writeRegister (uint8_t Address, int8_t accelData)
	Writes data to the accelerometer. More...
	interrupt (USCI_A0_VECTOR)
	Interrupt whenever we get a new byte from the accelerometer. More...

Variables
static int8_t	accelData
static int8_t	RevID
int8_t	Cma3000_xAccel
	Data value x from the accelerometer.
int8_t	Cma3000_yAccel
	Data value y from the accelerometer.
int8_t	Cma3000_zAccel
	Data value z from the accelerometer.
static volatile SampleBuffer *	sb
static volatile accel_state_t	accel_state
	Contain the current accelerometer state. More...
int8_t	Cma3000_xAccel
	Data value x from the accelerometer.
int8_t	Cma3000_yAccel
	Data value y from the accelerometer.
int8_t	Cma3000_zAccel
	Data value z from the accelerometer.

Detailed Description

Enumeration Type Documentation

enum accel_state_t

Enumerate possible states for the accelerometer finite state machine (FSM)

Enumerator
STATE_ACCEL_NONE	We have no or invalid data in the SampleBuffer.
STATE_ACCEL_XREQ	We have requested the data value for X.
STATE_ACCEL_XRDY	A data value for X is ready.
STATE_ACCEL_YREQ	We have requested the data value for Y.
STATE_ACCEL_YRDY	A data value for Y is ready.
STATE_ACCEL_ZREQ	We have requested the data value for Z.
STATE_ACCEL_ZRDY	A data value for Z is ready.
STATE_ACCEL_DONE	We have completed, there is a full set of valid data in the SampleBuffer.

Function Documentation

accel_state_t Cma3000_getState

(

void

)

Get the current state of the accelerometer.

Returns

The current state as an accel_state_t.

void Cma3000_init

(

volatile SampleBuffer *

samplebuffer

)

Configures the CMA3000-D01 3-Axis Ultra Low Power Accelerometer.

Parameters

samplebuffer

The SampleBuffer in which to place accelerometer data samples.

int8_t Cma3000_readRegister

(

uint8_t

Address

)

Reads data from the accelerometer.

Parameters

Address

Address of register

Returns

Register contents

int8_t Cma3000_writeRegister	(	uint8_t	Address,
		int8_t	accelData
	)

Writes data to the accelerometer.

Parameters

Address	Address of register
accelData	Data to be written to the accelerometer

Returns

Received data

interrupt

(

USCI_A0_VECTOR

)

Interrupt whenever we get a new byte from the accelerometer.

We should update the state machine and process the byte accordingly.

Variable Documentation

volatile accel_state_t accel_state

static

Contain the current accelerometer state.

This is volatile since it is modified in the interrupt service routine.