mma845x_drv.h File Reference

The mma845x_drv.h file describes the MMA845x driver interface and structures. More...

#include <stdint.h>
#include "mma845x.h"
#include "sensor_io_i2c.h"
#include "register_io_i2c.h"

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Data Structures
struct	mma845x_i2c_sensorhandle_t
	This defines the sensor specific information. More...
struct	mma845x_acceldata_t
	This structure defines the mma845x raw data buffer. More...

Macros
#define	MMA845x_ACCEL_DATA_SIZE   (0x06)
	The size of the MMA845x accel data. More...

Functions
int32_t	MMA845x_I2C_Initialize (mma845x_i2c_sensorhandle_t *pSensorHandle, ARM_DRIVER_I2C *pBus, uint8_t index, uint16_t sAddress, uint8_t whoAmi)
	The interface function to initialize the sensor. More...
void	MMA845x_I2C_SetIdleTask (mma845x_i2c_sensorhandle_t *pSensorHandle, registeridlefunction_t idleTask, void *userParam)
	: The interface function to set the I2C Idle Task. More...
int32_t	MMA845x_I2C_Configure (mma845x_i2c_sensorhandle_t *pSensorHandle, const registerwritelist_t *pRegWriteList)
	The interface function to configure he sensor. More...
int32_t	MMA845x_I2C_ReadData (mma845x_i2c_sensorhandle_t *pSensorHandle, const registerreadlist_t *pReadList, uint8_t *pBuffer)
	The interface function to read the sensor data. More...
int32_t	MMA845x_I2C_Deinit (mma845x_i2c_sensorhandle_t *pSensorHandle)
	The interface function to De Initialize sensor.. More...

Detailed Description

The mma845x_drv.h file describes the MMA845x driver interface and structures.

Definition in file mma845x_drv.h.

Macro Definition Documentation

MMA845x_ACCEL_DATA_SIZE

#define MMA845x_ACCEL_DATA_SIZE   (0x06)

The size of the MMA845x accel data.

Definition at line 73 of file mma845x_drv.h.

Referenced by main().

Function Documentation

MMA845x_I2C_Configure()

int32_t MMA845x_I2C_Configure	(	mma845x_i2c_sensorhandle_t *	pSensorHandle,
		const registerwritelist_t *	pRegWriteList
	)

The interface function to configure he sensor.

This function configure the sensor with requested ODR, Range and registers in the regsiter pair array.

Parameters

[in]	pSensorHandle	handle to the sensor.
[in]	pRegWriteList	pointer to the register list.

Constraints:

This can be called any number of times only after MMA845x_I2C_Initialize(). Application has to ensure that previous instances of these APIs have exited before invocation. No

Returns

MMA845x_I2C_Configure() returns the status.

Validate for the correct handle and register write list.

Check whether sensor handle is initialized before applying configuration.

Apply the Sensor Configuration based on the Register Write List

Put the device into active mode and ready for reading data.

Definition at line 87 of file mma845x_drv.c.

References mma845x_i2c_sensorhandle_t::deviceInfo, int32_t(), mma845x_i2c_sensorhandle_t::isInitialized, MMA845x_CTRL_REG1, MMA845x_CTRL_REG1_MODE_ACTIVE, MMA845x_CTRL_REG1_MODE_MASK, MMA845x_CTRL_REG1_MODE_STANDBY, mma845x_i2c_sensorhandle_t::pCommDrv, Register_I2C_Write(), SENSOR_ERROR_INIT, SENSOR_ERROR_INVALID_PARAM, SENSOR_ERROR_NONE, SENSOR_ERROR_WRITE, Sensor_I2C_Write(), mma845x_i2c_sensorhandle_t::slaveAddress, and status.

Referenced by main().

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MMA845x_I2C_Deinit()

int32_t MMA845x_I2C_Deinit

(

mma845x_i2c_sensorhandle_t *

pSensorHandle

)

The interface function to De Initialize sensor..

This function made sensor in a power safe state and de initialize its handle.

Parameters

[in]

pSensorHandle

handle to the sensor.

Constraints:

This can be called only after MMA845x_I2C_Initialize() has been called. Application has to ensure that previous instances of these APIs have exited before invocation. No

Returns

MMA845x_I2C_Deinit() returns the status.

Check whether sensor handle is initialized before triggering sensor reset.

Trigger sensor device reset.

De-initialize sensor handle.

Definition at line 159 of file mma845x_drv.c.

References mma845x_i2c_sensorhandle_t::deviceInfo, mma845x_i2c_sensorhandle_t::isInitialized, MMA845x_CTRL_REG2, MMA845x_CTRL_REG2_RST_ENABLED, MMA845x_CTRL_REG2_RST_MASK, mma845x_i2c_sensorhandle_t::pCommDrv, Register_I2C_Write(), SENSOR_ERROR_INIT, SENSOR_ERROR_INVALID_PARAM, SENSOR_ERROR_NONE, and mma845x_i2c_sensorhandle_t::slaveAddress.

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MMA845x_I2C_Initialize()

int32_t MMA845x_I2C_Initialize	(	mma845x_i2c_sensorhandle_t *	pSensorHandle,
		ARM_DRIVER_I2C *	pBus,
		uint8_t	index,
		uint16_t	sAddress,
		uint8_t	whoAmi
	)

The interface function to initialize the sensor.

This function initialize the sensor and sensor handle.

Parameters

[in]	pSensorHandle	handle to the sensor.
[in]	pBus	pointer to the CMSIS API compatible I2C bus object.
[in]	index	the I2C device number.
[in]	sAddress	slave address of the device on the bus.
[in]	whoami	WHO_AM_I value of the device.

Constraints:

This should be the first API to be called. Application has to ensure that previous instances of these APIs have exited before invocation. No

Returns

MMA845x_I2C_Initialize() returns the status.

Check the input parameters.

Read and store the device's WHO_AM_I.

Initialize the sensor handle.

Definition at line 48 of file mma845x_drv.c.

References mma845x_i2c_sensorhandle_t::deviceInfo, registerDeviceInfo_t::deviceInstance, registerDeviceInfo_t::functionParam, registerDeviceInfo_t::idleFunction, int32_t(), mma845x_i2c_sensorhandle_t::isInitialized, MMA845x_WHO_AM_I, mma845x_i2c_sensorhandle_t::pCommDrv, Register_I2C_Read(), SENSOR_ERROR_INIT, SENSOR_ERROR_INVALID_PARAM, SENSOR_ERROR_NONE, mma845x_i2c_sensorhandle_t::slaveAddress, and status.

Referenced by main().

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MMA845x_I2C_ReadData()

int32_t MMA845x_I2C_ReadData	(	mma845x_i2c_sensorhandle_t *	pSensorHandle,
		const registerreadlist_t *	pReadList,
		uint8_t *	pBuffer
	)

The interface function to read the sensor data.

This function read the sensor data out from the device and returns raw data in a byte stream.

Parameters

[in]	pSensorHandle	handle to the sensor.
[in]	pReadList	pointer to the list of device registers and values to read.
[out]	pBuffer	buffer which holds raw sensor data.This buffer may be back to back databuffer based command read in the list.

Constraints:

This can be called any number of times only after MMA845x_I2C_Initialize(). Application has to ensure that previous instances of these APIs have exited before invocation. No

Returns

MMA845x_I2C_ReadData() returns the status.

Validate for the correct handle and register read list.

Check whether sensor handle is initialized before reading sensor data.

Parse through the read list and read the data one by one.

Definition at line 130 of file mma845x_drv.c.

References mma845x_i2c_sensorhandle_t::deviceInfo, int32_t(), mma845x_i2c_sensorhandle_t::isInitialized, mma845x_i2c_sensorhandle_t::pCommDrv, SENSOR_ERROR_INIT, SENSOR_ERROR_INVALID_PARAM, SENSOR_ERROR_NONE, SENSOR_ERROR_READ, Sensor_I2C_Read(), mma845x_i2c_sensorhandle_t::slaveAddress, and status.

Referenced by main().

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MMA845x_I2C_SetIdleTask()

void MMA845x_I2C_SetIdleTask	(	mma845x_i2c_sensorhandle_t *	pSensorHandle,
		registeridlefunction_t	idleTask,
		void *	userParam
	)

: The interface function to set the I2C Idle Task.

Parameters

[in]		mma845x_i2c_sensorhandle_t *pSensorHandle, handle to the sensor handle.
[in]		registeridlefunction_t idleTask, function pointer to the function to execute on I2C Idle Time.
[in]		void *userParam, the pointer to the user idle ftask parameters.

Returns

void.

Constraints:

This can be called any number of times only after MMA845x_I2C_Initialize(). Application has to ensure that previous instances of these APIs have exited before invocation. No

Definition at line 79 of file mma845x_drv.c.

References mma845x_i2c_sensorhandle_t::deviceInfo, registerDeviceInfo_t::functionParam, and registerDeviceInfo_t::idleFunction.

Referenced by main().

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